[New learn] UIKit 框架类

NSObject	NSObject is the root class of most Objective-C class hierarchies.
NSDataAsset	The NSDataAsset class enables you to access an object from a data set type stored in an asset catalog.
NSFileProviderExtension	NSFileProviderExtension is the principal class for the File Provider extension.
NSLayoutAnchor	The NSLayoutAnchor class is a factory class for creating NSLayoutConstraint objects using a fluent API.
NSLayoutDimension	The NSLayoutDimension class is a factory class for creating size-based NSLayoutConstraint objects using a fluent API.
NSLayoutXAxisAnchor	The NSLayoutXAxisAnchor class is a factory class for creating horizontal NSLayoutConstraint objects using a fluent API.
NSLayoutYAxisAnchor	The NSLayoutYAxisAnchor class is a factory class for creating vertical NSLayoutConstraint objects using a fluent API.
NSLayoutConstraint	A constraint defines a relationship between two user interface objects that must be satisfied by the constraint-based layout system.
NSLayoutManager	An NSLayoutManager object coordinates the layout and display of characters held in an NSTextStorage object.
NSParagraphStyle	The NSParagraphStyle class and its subclass NSMutableParagraphStyle encapsulate the paragraph or ruler attributes used by the NSAttributedString classes.
NSMutableParagraphStyle	The NSMutableParagraphStyle class adds methods to its superclass, NSParagraphStyle, for changing the values of the subattributes in a paragraph style attribute.
NSShadow	An NSShadow object encapsulates the attributes used to create a drop shadow during drawing operations.
NSStringDrawingContext	The NSStringDrawingContext class manages metrics used when drawing attributed strings.
NSTextAttachment	NSTextAttachment objects are used by the NSAttributedString class cluster as the values for attachment attributes (stored in the attributed string under the key named NSAttachmentAttributeName).
NSTextContainer	The NSTextContainer class defines a region in which text is laid out.
NSTextTab	An NSTextTab object represents a tab in an NSParagraphStyle object, storing an alignment type and location.
UIAcceleration	An instance of the UIAcceleration class, called an acceleration event, represents immediate, three-dimensional acceleration data.
UIAccelerometer	The UIAccelerometer class lets you register to receive acceleration-related data from the onboard hardware.
UIAccessibilityCustomAction	A UIAccessibilityCustomAction object represents a custom action to be performed on an accessible object.
UIAccessibilityElement	The UIAccessibilityElement class encapsulates information about an item that should be accessible to users with disabilities, but that isn’t accessible by default.
UIActivity	The UIActivity class is an abstract class that you subclass in order to implement application-specific services.
UIAlertAction	A UIAlertAction object represents an action that can be taken when tapping a button in an alert.
UIApplicationShortcutIcon	An application shortcut, or quick action, icon is an image you can optionally associate with a Home screen quick action to improve its appearance and usability.
UIApplicationShortcutItem	An application shortcut item, also called a Home screen dynamic quick action, specifies a user-initiated action for your app.
UIMutableApplicationShortcutItem	A mutable application shortcut item, also called, verbosely, a mutable Home screen dynamic quick action, specifies a configurable user-initiated action for your app.
UIBarButtonItemGroup	A UIBarButtonItemGroup object manages a set of bar button items on the shortcuts bar above the keyboard on iPad.
UIBarItem	UIBarItem is an abstract superclass for items added to a bar that appears at the bottom of the screen.
UIBarButtonItem	A bar button item is a button specialized for placement on a UIToolbar or UINavigationBar object.
UITabBarItem	The UITabBarItem class implements an item on a UITabBar object.
UIBezierPath	The UIBezierPath class lets you define a path consisting of straight and curved line segments and render that path in your custom views.
UICollectionViewLayout	The UICollectionViewLayout class is an abstract base class that you subclass and use to generate layout information for a collection view.
UICollectionViewFlowLayout	The UICollectionViewFlowLayout class is a concrete layout object that organizes items into a grid with optional header and footer views for each section.
UICollectionViewTransitionLayout	The UICollectionViewTransitionLayout class is a special type of layout object that lets you implement behaviors when changing from one layout to another in your collection view.
UICollectionViewLayoutAttributes	An UICollectionViewLayoutAttributes object manages the layout-related attributes for a given item in a collection view.
UICollectionViewLayoutInvalidationContext	A UICollectionViewLayoutInvalidationContext object declares which parts of your layout need to be updated when the layout is invalidated.
UICollectionViewFlowLayoutInvalidationContext	A UICollectionViewFlowLayoutInvalidationContext object specifies properties for determining whether to recompute the size of items or their position in the layout.
UICollectionViewUpdateItem	The UICollectionViewUpdateItem class describes a single change to make to an item in a collection view.
UIColor	A UIColor object represents color and sometimes opacity (alpha value).
UIDevice	The UIDevice class provides a singleton instance representing the current device.
UIDictationPhrase	A dictation phrase object represents the textual interpretation of a spoken phrase as dictated by a user.
UIDocument	The UIDocument class is an abstract base class for managing the data of documents.
UIManagedDocument	UIManagedDocument is a concrete subclass of UIDocument that integrates with Core Data.
UIDocumentInteractionController	A document interaction controller, along with a delegate object, provides in-app support for managing user interactions with files in the local system.
UIDynamicAnimator	A dynamic animator provides physics-related capabilities and animations for its dynamic items, and provides the context for those animations.
UIDynamicBehavior	A dynamic behavior confers a behavioral configuration on one or more dynamic items for their participation in two-dimensional animation.
UIAttachmentBehavior	A UIAttachmentBehavior object creates a relationship between two dynamic items, or between a dynamic item and an anchor point.
UICollisionBehavior	A collision behavior confers, to a specified array of dynamic items, the ability of those items to engage in collisions with each other and with the behavior’s specified boundaries.
UIDynamicItemBehavior	A dynamic item behavior represents a base dynamic animation configuration for one or more dynamic items.
UIFieldBehavior	A UIFieldBehavior object applies field-based physics to dynamic items.
UIGravityBehavior	A UIGravityBehavior object applies a gravity-like force to all of its associated dynamic items.
UIPushBehavior	A push behavior applies a continuous or instantaneous force to one or more dynamic items, causing those items to change position accordingly.
UISnapBehavior	A snap behavior defines a dynamic item’s movement to a specified point; the movement proceeds with a spring-like effect, ending with an oscillation whose amount you can set.
UIDynamicItemGroup	A UIDynamicItemGroup object represents a dynamic item comprised of multiple other dynamic items.
UIEvent	A UIEvent object (or, simply, an event object) represents an event in iOS.
UIPressesEvent	A UIPressesEvent object is an event that describes the state of a set of physical buttons that are available to the device, such as those on an associated remote or game controller.
UIFocusAnimationCoordinator	The UIFocusAnimationCoordinator class helps coordinate focus-related animations during a focus update.
UIFocusUpdateContext	The UIFocusUpdateContext class provides information relevant to a specific focus update from one view to another.
UICollectionViewFocusUpdateContext	A UICollectionViewFocusUpdateContext object stores information specific to a focus update in a collection view.
UITableViewFocusUpdateContext	The UITableViewFocusUpdateContext is a subclass of the UIFocusUpdateContext and provide information relevant to a specific focus update from one view to another.
UIFont	The UIFont class provides the interface for getting and setting font information.
UIFontDescriptor	UIFontDescriptor objects provide a mechanism to describe a font with a dictionary of attributes.
UIGestureRecognizer	UIGestureRecognizer is an abstract base class for concrete gesture-recognizer classes.
UILongPressGestureRecognizer	UILongPressGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for long-press gestures.
UIPanGestureRecognizer	UIPanGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for panning (dragging) gestures.
UIScreenEdgePanGestureRecognizer	A UIScreenEdgePanGestureRecognizer looks for panning (dragging) gestures that start near an edge of the screen.
UIPinchGestureRecognizer	UIPinchGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for pinching gestures involving two touches.
UIRotationGestureRecognizer	UIRotationGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for rotation gestures involving two touches.
UISwipeGestureRecognizer	UISwipeGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for swiping gestures in one or more directions.
UITapGestureRecognizer	UITapGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for single or multiple taps.
UIImage	A UIImage object is a high-level way to display image data.
UIImageAsset	A UIImageAsset object is a container for a collection of images that represent multiple ways of describing a single piece of artwork.
UIKeyCommand	The UIKeyCommand class specifies a key presses performed on a hardware keyboard and the resulting action that should take place.
UILayoutGuide	The UILayoutGuide class defines a rectangular area that can interact with Auto Layout.
UIFocusGuide	The UIFocusGuide class is designed to expose non view areas as focusable.
UILexicon	A lexicon contains a read-only array of term pairs, each in a UILexiconEntry object, for use by a custom keyboard.
UILexiconEntry	A lexicon entry specifies a read-only term pair, available within a UILexicon object, for use by a custom keyboard.
UILocalNotification	A UILocalNotification object specifies a notification that an app can schedule for presentation at a specific date and time.
UILocalizedIndexedCollation	The UILocalizedIndexedCollation class is a convenience for organizing, sorting, and localizing the data for a table view that has a section index.
UIMenuController	The singleton UIMenuController instance presents the menu interface for the Cut, Copy, Paste, Select, Select All, and Delete commands.
UIMenuItem	An instance of the UIMenuItem class represents a custom item in the editing menu managed by the UIMenuController object.
UIMotionEffect	The UIMotionEffect class is an abstract superclass for defining motion-based modifiers for views.
UIInterpolatingMotionEffect	A UIInterpolatingMotionEffect object maps the horizontal or vertical tilt of a device to values that you specify so that UIKit can apply those values to your views.
UIMotionEffectGroup	The UIMotionEffectGroup class manages a collection of motion effects that you want to apply to a view at the same time.
UINavigationItem	A UINavigationItem object manages the buttons and views to be displayed in a UINavigationBar object.
UINib	Instances of the UINib class serve as object wrappers, or containers, for Interface Builder nib files.
UIPasteboard	The UIPasteboard class enables an app to share data within the app and with another app.
UIPercentDrivenInteractiveTransition	A percent-driven interactive transition object drives the custom animation between the disappearance of one view controller and the appearance of another.
UIPopoverController	The UIPopoverController class is used to manage the presentation of content in a popover.
UIPresentationController	A UIPresentationController object provides advanced view and transition management for presented view controllers.
UIPopoverPresentationController	A UIPopoverPresentationController object manages the display of content in a popover.
UIPress	A UIPress object represents the presence or movement of a button press on the screen for a particular event.
UIPreviewAction	A preview action, or peek quick action, is displayed below a peek when a user swipes the peek upward.
UIPreviewActionGroup	A preview quick action group contains one or more child quick actions, each an instance of the UIPreviewAction class.
UIPrintFormatter	UIPrintFormatter is an abstract base class for print formatters: objects that lay out custom printable content that can cross page boundaries.
UIMarkupTextPrintFormatter	Instances of the UIMarkupTextPrintFormatter class lay out HTML markup text for a multipage print job.
UISimpleTextPrintFormatter	Instances of the UISimpleTextPrintFormatter class lay out plain text for printing, possibly over multiple pages.
UIViewPrintFormatter	An instance of the UIViewPrintFormatter class lays out the drawn content of a view for printing.
UIPrintInfo	A UIPrintInfo object encapsulates information about a print job, including printer identifier, job name, output type (photo, normal, grayscale), orientation (portrait or landscape), and any selected duplex mode.
UIPrintInteractionController	The shared instance of the UIPrintInteractionController class presents a printing user interface and manages the printing of documents, images, and other printable content in iOS.
UIPrintPageRenderer	A UIPrintPageRenderer object draws pages of content that are to be printed, with or without the assistance of print formatters.
UIPrintPaper	An instance of the UIPrintPaper class encapsulates the size of paper used for a print job and the rectangle in which content can be printed.
UIPrinter	A UIPrinter object contains the attributes of a printer on the network.
UIPrinterPickerController	A UIPrinterPickerController object displays the system interface for selecting a printer.
UIRegion	A UIRegion object defines shape for use in UIKit Dynamics.
UIResponder	The UIResponder class defines an interface for objects that respond to and handle events.
UIApplication	The UIApplication class provides a centralized point of control and coordination for apps running in iOS.
UIView	The UIView class defines a rectangular area on the screen and the interfaces for managing the content in that area.
UIActionSheet	Important: UIActionSheet is deprecated in iOS 8.
UIActivityIndicatorView	Use an activity indicator to show that a task is in progress.
UIAlertView	Important: UIAlertView is deprecated in iOS 8.
UICollectionReusableView	The UICollectionReusableView class defines the behavior for all cells and supplementary views presented by a collection view.
UICollectionViewCell	A UICollectionViewCell object presents the content for a single data item when that item is within the collection view’s visible bounds.
UIControl	UIControl is the base class for control objects such as buttons and sliders that convey user intent to the application.
UIButton	An instance of the UIButton class implements a button on the touch screen.
UIDatePicker	The UIDatePicker class implements an object that uses multiple rotating wheels to allow users to select dates and times.
UIPageControl	You use the UIPageControl class to create and manage page controls.
UIRefreshControl	A UIRefreshControl object provides a standard control that can be used to initiate the refreshing of a table view’s contents.
UISegmentedControl	A UISegmentedControl object is a horizontal control made of multiple segments, each segment functioning as a discrete button.
UISlider	A UISlider object is a visual control used to select a single value from a continuous range of values.
UIStepper	A stepper control provides a user interface for incrementing or decrementing a value.
UISwitch	You use the UISwitch class to create and manage the On/Off buttons used, for example, in the Settings app for options such as Airplane Mode and Bluetooth.
UITextField	A UITextField object is a control that displays editable text and sends an action message to a target object when the user presses the return button.
UIImageView	An image view object provides a view-based container for displaying either a single image or for animating a series of images.
UIInputView	The UIInputView class is designed to match the appearance of the standard system keyboard when used as an input view with a responder.
UILabel	The UILabel class implements a read-only text view.
UINavigationBar	The UINavigationBar class provides a control for navigating hierarchical content.
UIPickerView	The UIPickerView class implements objects, called picker views, that use a spinning-wheel or slot-machine metaphor to show one or more sets of values.
UIPopoverBackgroundView	The UIPopoverBackgroundView class provides the background appearance for a popover.
UIProgressView	You use the UIProgressView class to depict the progress of a task over time.
UIScrollView	The UIScrollView class provides support for displaying content that is larger than the size of the application’s window.
UICollectionView	The UICollectionView class manages an ordered collection of data items and presents them using customizable layouts.
UITableView	An instance of UITableView (or simply, a table view) is a means for displaying and editing hierarchical lists of information.
UITextView	The UITextView class implements the behavior for a scrollable, multiline text region.
UISearchBar	The UISearchBar class implements a text field control for text-based searches.
UIStackView	The UIStackView class provides a streamlined interface for laying out a collection of views in either a column or a row.
UITabBar	A tab bar is a control, usually appearing across the bottom of the screen in the context of a tab bar controller, for giving the user one-tap, modal access to a set of views in an app.
UITableViewCell	The UITableViewCell class defines the attributes and behavior of the cells that appear in UITableView objects.
UITableViewHeaderFooterView	The UITableViewHeaderFooterView class implements a reusable view that can be placed at the top or bottom of a table section.
UIToolbar	A toolbar is a control that displays one or more buttons, called toolbar items.
UIVisualEffectView	A UIVisualEffectView object gives you an easy way implement some complex visual effects.
UIWebView	You can use the UIWebView class to embed web content in your app.
UIWindow	The UIWindow class defines an object known as a window that manages and coordinates the views an app displays on a device screen.
UIViewController	The UIViewController class provides the infrastructure for managing the views of your iOS apps.
UIActivityViewController	The UIActivityViewController class is a standard view controller that you can use to offer various services from your application.
UIAlertController	A UIAlertController object displays an alert message to the user.
UICollectionViewController	The UICollectionViewController class represents a view controller whose content consists of a collection view.
UIDocumentMenuViewController	A UIDocumentMenuViewController object represents a list of all the available document providers for a given file type and mode.
UIDocumentPickerExtensionViewController	The UIDocumentPickerExtensionViewController class is the principal class for the Document Picker View Controller extension.
UIDocumentPickerViewController	A UIDocumentPickerViewController object lets the user select documents or destinations outside your app’s sandbox.
UIInputViewController	To create a custom keyboard, start by subclassing the UIInputViewController class.
UINavigationController	The UINavigationController class implements a specialized view controller that manages the navigation of hierarchical content.
UIImagePickerController	The UIImagePickerController class manages customizable, system-supplied user interfaces for taking pictures and movies on supported devices, and for choosing saved images and movies for use in your app.
UIVideoEditorController	A UIVideoEditorController object, or video editor, manages the system-supplied user interface for trimming video frames from the start and end of a previously recorded movie as well as reencoding to lower quality.
UIPageViewController	A page view controller lets the user navigate between pages of content, where each page is managed by its own view controller object.
UIReferenceLibraryViewController	A UIReferenceLibraryViewController object provides a dictionary service to look up the definition of a word or term from within an app.
UISearchContainerViewController	A UISearchContainerViewController object is a wrapper for search results that you want to embed in a container view controller.
UISearchController	A UISearchController object manages the display of search results based on interactions with a search bar.
UISplitViewController	The UISplitViewController class is a container view controller that presents a master-detail interface.
UITabBarController	The UITabBarController class implements a specialized view controller that manages a radio-style selection interface.
UITableViewController	The UITableViewController class creates a controller object that manages a table view.
UIScreen	A UIScreen object defines the properties associated with a hardware-based display.
UIScreenMode	A UIScreenMode object represents a possible set of attributes that can be applied to a UIScreen object.
UISearchDisplayController	Important: UISearchDisplayController is deprecated in iOS 8.
UIStoryboard	A UIStoryboard object encapsulates the view controller graph stored in an Interface Builder storyboard resource file.
UIStoryboardSegue	A UIStoryboardSegue object is responsible for performing the visual transition between two view controllers.
UIStoryboardPopoverSegue	The UIStoryboardPopoverSegue class defines a specific type of segue for presenting content in a popover.
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UITableViewRowAction	A UITableViewRowAction object defines a single action to present when the user swipes horizontally in a table row.
UITextChecker	You use instances of the UITextChecker class to check a string (usually the text of a document) for misspelled words.
UITextInputAssistantItem	A UITextInputAssistantItem object manages bar button items displayed in the shortcuts bar above the keyboard on iPad.
UITextInputMode	An instance of the UITextInputMode class represents the current text-input mode.
UITextInputStringTokenizer	The UITextInputStringTokenizer class is a base implementation of the UITextInputTokenizer protocol provided by the UIKit framework.
UITextPosition	A UITextPosition object represents a position in a text container; in other words, it is an index into the backing string in a text-displaying view.
UITextRange	A UITextRange object represents a range of characters in a text container; in other words, it identifies a starting index and an ending index in string backing a text-entry object.
UITextSelectionRect	The UITextSelectionRect class encapsulates information about a selected range of text in a document.
UITouch	A UITouch object represents the location, size, movement, and force of a finger on the screen for a particular event.
UITraitCollection	A trait collection describes the iOS interface environment for your app, including traits such as horizontal and vertical size class, display scale, and user interface idiom.
UIUserNotificationAction	A UIUserNotificationAction object represents a custom action that your app can perform in response to a remote or local notification.
UIMutableUserNotificationAction	A UIMutableUserNotificationAction object represents a modifiable version of the UIUserNotificationAction class.
UIUserNotificationCategory	A UIUserNotificationCategory object encapsulates information about custom actions that your app can perform in response to a local or push notification.
UIMutableUserNotificationCategory	A UIMutableUserNotificationCategory object encapsulates information about custom actions that your app can perform in response to a local or push notification.
UIUserNotificationSettings	A UIUserNotificationSettings object encapsulates the types of notifications that can be displayed to the user by your app.
UIVisualEffect	This class contains no methods and is intended as a way to initialize a UIVisualEffectView with UIBlurEffect and UIVibrancyEffect objects.
UIBlurEffect	A UIBlurEffect object applies a blurring effect to the content layered behind a UIVisualEffectView.
UIVibrancyEffect	A UIVibrancyEffect object amplifies and adjusts the color of the content layered behind a UIVisualEffectView object, allowing the content placed inside of the contentView to become more vivid.
NSMutableAttributedString	NSMutableAttributedString declares the programmatic interface to objects that manage mutable attributed strings.
NSTextStorage	NSTextStorage is a semiconcrete subclass of NSMutableAttributedString that manages a set of client NSLayoutManager objects, notifying them of any changes to its characters or attributes so that they can relay and redisplay the text as needed.
NSOperation	The NSOperation class is an abstract class you use to encapsulate the code and data associated with a single task.
UIActivityItemProvider	A UIActivityItemProvider object is a proxy for data passed to an activity view controller.

Protocols

NSLayoutManagerDelegate	The NSLayoutManagerDelegate protocol defines the optional methods implemented by delegates of NSLayoutManager objects.
NSTextAttachmentContainer	The NSTextAttachmentContainer protocol defines the interface to text attachment objects from NSLayoutManager.
NSTextLayoutOrientationProvider	The NSTextLayoutOrientationProvider protocol defines an interface providing the default orientation for text laid out in a conforming object, in absence of an explicit NSVerticalGlyphFormAttributeName attribute.
NSTextStorageDelegate	The NSTextStorageDelegate protocol defines the optional methods implemented by delegates of NSTextStorage objects.
UIAccelerometerDelegate	The UIAccelerometerDelegate protocol defines a single method for receiving acceleration-related data from the system.
UIAccessibility	The UIAccessibility informal protocol provides accessibility information about an application’s user interface elements.
UIAccessibilityAction	The UIAccessibilityAction informal protocol provides a way for accessibility elements to support specific actions, such as selecting values in a range or scrolling through information on the screen.
UIAccessibilityContainer	The UIAccessibilityContainer informal protocol provides a way for UIView subclasses to make selected components accessible as separate elements.
UIAccessibilityFocus	The UIAccessibilityFocus informal protocol provides a way to find out whether an assistive technology, such as VoiceOver, is focused on an accessible element.
UIAccessibilityIdentification	The UIAccessibilityIdentification protocol is used to associate a unique identifier with elements in your user interface.
UIAccessibilityReadingContent	The UIAccessibilityReadingContent protocol can be implemented on an object that represents content that is intended to be read by users, such as a book or an article.
UIActionSheetDelegate	Important: UIActionSheetDelegate is deprecated in iOS 8.
UIActivityItemSource	The UIActivityItemSource protocol defines the methods used by a UIActivityViewController object to retrieve the data items to act on.
UIAdaptivePresentationControllerDelegate	An object that conforms to the UIAdaptivePresentationControllerDelegate protocol works with a presentation controller to determine how to respond to trait changes in your app.
UIAlertViewDelegate	Important: UIAlertViewDelegate is deprecated in iOS 8.
UIAppearance	Use the UIAppearance protocol to get the appearance proxy for a class.
UIAppearanceContainer	A class must adopt the UIAppearance protocol to allow appearance customization using the UIAppearance API.
UIApplicationDelegate	The UIApplicationDelegate protocol defines methods that are called by the singleton UIApplication object in response to important events in the lifetime of your app.
UIBarPositioning	The UIBarPositioning protocol defines the ways that bars can be positioned on iOS devices.
UIBarPositioningDelegate	The UIBarPositioningDelegate protocol supports the positioning of a bar that conforms to the UIBarPositioning protocol.
UICollectionViewDataSource	An object that adopts the UICollectionViewDataSource protocol is responsible for providing the data and views required by a collection view.
UICollectionViewDelegate	The UICollectionViewDelegate protocol defines methods that allow you to manage the selection and highlighting of items in a collection view and to perform actions on those items.
UICollectionViewDelegateFlowLayout	The UICollectionViewDelegateFlowLayout protocol defines methods that let you coordinate with a UICollectionViewFlowLayout object to implement a grid-based layout.
UICollisionBehaviorDelegate	To respond to UIKit dynamic item collisions, configure a custom class to adopt the UICollisionBehaviorDelegate protocol.
UIContentContainer	The methods of the UIContentContainer protocol help you adapt the contents of your view controllers to size and trait changes.
UICoordinateSpace	The UICoordinateSpace protocol defines methods for converting between different frames of reference on a screen.
UIDataSourceModelAssociation	The UIDataSourceModelAssociation protocol defines an interface for providing persistent references to data objects in your app.
UIDocumentInteractionControllerDelegate	The UIDocumentInteractionControllerDelegate protocol includes methods you can implement to respond to messages from a document interaction controller.
UIDocumentMenuDelegate	The UIDocumentMenuDelegate protocol defines the methods you must implement to track user interactions with a document menu view controller.
UIDocumentPickerDelegate	The UIDocumentPickerDelegate protocol defines the methods you must implement to track when the user selects a document or destination, or to track when the document picker is canceled.
UIDynamicAnimatorDelegate	To respond to the pausing or resumption of UIKit dynamic animation, configure a custom class to adopt the UIDynamicAnimatorDelegate protocol.
UIDynamicItem	To make a custom object eligible to participate in UIKit Dynamics, adopt the UIDynamicItem protocol in the object’s class.
UIFocusEnvironment	The UIFocusEnvironment protocol defines the focus behavior for a branch of the view hierarchy.
UIGestureRecognizerDelegate	Delegates of a gesture recognizer—that is, an instance of a concrete subclass of UIGestureRecognizer—adopt the UIGestureRecognizerDelegate protocol to fine-tune an app’s gesture-recognition behavior.
UIGuidedAccessRestrictionDelegate	Adopting the UIGuidedAccessRestrictionDelegate protocol in your application delegate allows you to add custom restrictions for the Guided Access feature in iOS.
UIImagePickerControllerDelegate	The UIImagePickerControllerDelegate protocol defines methods that your delegate object must implement to interact with the image picker interface.
UIInputViewAudioFeedback	The UIInputViewAudioFeedback protocol defines a single property for enabling a custom input or keyboard accessory view to play standard keyboard input clicks.
UIKeyInput	A subclass of UIResponder can adopt this protocol to implement simple text entry.
UILayoutSupport	This protocol is implemented by the UIViewController properties topLayoutGuide and bottomLayoutGuide to support using Auto Layout with a view controller’s view, starting in iOS 7.
UINavigationBarDelegate	The UINavigationBarDelegate protocol defines optional methods that a UINavigationBar delegate should implement to update its views when items are pushed and popped from the stack.
UINavigationControllerDelegate	Use a navigation controller delegate (a custom object that implements this protocol) to modify behavior when a view controller is pushed or popped from the navigation stack of a UINavigationController object.
UIObjectRestoration	The UIObjectRestoration protocol should be adopted by classes that act as "restoration classes” for objects during the state restoration process.
UIPageViewControllerDataSource	The UIPageViewControllerDataSource protocol is adopted by an object that provides view controllers to the page view controller on an as-needed basis, in response to navigation gestures.
UIPageViewControllerDelegate	The delegate of a page view controller must adopt the UIPageViewControllerDelegate protocol.
UIPickerViewAccessibilityDelegate	The UIPickerViewAccessibilityDelegate protocol defines methods you can implement to provide accessibility information for individual components of a picker view.
UIPickerViewDataSource	The UIPickerViewDataSource protocol must be adopted by an object that mediates between a UIPickerView object and your application’s data model for that picker view.
UIPickerViewDelegate	The delegate of a UIPickerView object must adopt this protocol and implement at least some of its methods to provide the picker view with the data it needs to construct itself.
UIPopoverBackgroundViewMethods	The UIPopoverBackgroundViewMethods protocol defines methods that UIPopoverBackgroundView subclasses must implement.
UIPopoverControllerDelegate	The UIPopoverControllerDelegate protocol defines the methods you can implement for the delegate of a UIPopoverController object.
UIPopoverPresentationControllerDelegate	The methods of the UIPopoverPresentationControllerDelegate protocol let you customize the behavior of a popover-based presentation.
UIPreviewActionItem	The UIPreviewActionItem protocol is adopted by the UIPreviewAction and UIPreviewActionGroup classes.
UIPrintInteractionControllerDelegate	The UIPrintInteractionControllerDelegate protocol is implemented by the delegate of the UIPrintInteractionController shared instance to perform a number of optional tasks.
UIPrinterPickerControllerDelegate	The UIPrinterPickerControllerDelegate protocol defines methods for managing the presentation and dismissal of a printer picker interface.
UIResponderStandardEditActions	The UIResponderStandardEditActions informal protocol declares methods that responder classes should override to handle common editing commands invoked in the user interface, such as Copy, Paste, and Select.
UIScrollViewAccessibilityDelegate	The UIScrollViewAccessibilityDelegate protocol defines methods you can implement to provide accessibility information for a scrollview.
UIScrollViewDelegate	The methods declared by the UIScrollViewDelegate protocol allow the adopting delegate to respond to messages from the UIScrollView class and thus respond to, and in some affect, operations such as scrolling, zooming, deceleration of scrolled content, and scrolling animations.
UISearchBarDelegate	The UISearchBarDelegate protocol defines the optional methods you implement to make a UISearchBar control functional.
UISearchControllerDelegate	This protocol defines delegate methods for UISearchController objects.
UISearchDisplayDelegate	Important: UISearchDisplayDelegate is deprecated in iOS 8.
UISearchResultsUpdating	Use the UISearchResultsUpdating protocol to update search results based on information the user enters into the search bar.
UISplitViewControllerDelegate	The UISplitViewControllerDelegate protocol defines methods that allow you to manage changes to a split view interface.
UIStateRestoring	The UIStateRestoring protocol lets you include any object in your state restoration archives.
UITabBarControllerDelegate	You use the UITabBarControllerDelegate protocol when you want to augment the behavior of a tab bar.
UITabBarDelegate	The UITabBarDelegate protocol defines optional methods for a delegate of a UITabBar object.
UITableViewDataSource	The UITableViewDataSource protocol is adopted by an object that mediates the application’™s data model for a UITableView object.
UITableViewDelegate	The delegate of a UITableView object must adopt the UITableViewDelegate protocol.
UITextDocumentProxy	A text document proxy provides textual context to a custom keyboard (which is based on the UIInputViewController class) by way of the keyboard’s textDocumentProxy property.
UITextFieldDelegate	The UITextFieldDelegate protocol defines the messages sent to a text field delegate as part of the sequence of editing its text.
UITextInput	Classes that adopt the UITextInput protocol (and conform with inherited protocols) interact with the text input system and thus acquire features such as autocorrection and multistage text input for their documents.
UITextInputDelegate	The text input delegate acts as an intermediary between a document and the text input system, conveying notifications of pending or transpired changes in text and selection in the document.
UITextInputTokenizer	An instance of a class that adopts the UITextInputTokenizer protocol is a tokenizer; a tokenizer allows the text input system to evaluate text units of different granularities.
UITextInputTraits	The UITextInputTraits protocol defines features associated with keyboard input to a text object.
UITextViewDelegate	The UITextViewDelegate protocol defines a set of optional methods you can use to receive editing-related messages for UITextView objects.
UIToolbarDelegate	The UIToolbarDelegate protocol defines the interface that toolbar delegate objects implement to manage the toolbar behavior.
UITraitEnvironment	The iOS interface environment, which includes such traits as horizontal and vertical size class, display scale, and user interface idiom, is available to apps through the UITraitEnvironment protocol.
UIVideoEditorControllerDelegate	The UIVideoEditorControllerDelegate protocol defines methods that your delegate object must implement to respond to the video editor.
UIViewControllerAnimatedTransitioning	Adopt the UIViewControllerAnimatedTransitioning protocol in objects that implement the animations for a custom view controller transition.
UIViewControllerContextTransitioning	The UIViewControllerContextTransitioning protocol’s methods provide contextual information for transition animations between view controllers.
UIViewControllerInteractiveTransitioning	To enable an object (such as a navigation controller) to drive a view controller transition, configure a custom class to adopt the UIViewControllerInteractiveTransitioning protocol.
UIViewControllerPreviewing	This protocol defines the interface for configuring a previewing view controller on devices that support 3D Touch.
UIViewControllerPreviewingDelegate	Implement the methods of this protocol to respond, with a preview view controller and a commit view controller, to the user pressing a view object on the screen of a device that supports 3D Touch.
UIViewControllerRestoration	The UIViewControllerRestoration protocol should be adopted by classes that act as "restoration classes” for view controllers during the state restoration process.
UIViewControllerTransitionCoordinator	An object that adopts the UIViewControllerTransitionCoordinator protocol provides support for animations associated with a view controller transition.
UIViewControllerTransitionCoordinatorContext	An object that conforms to the UIViewControllerTransitionCoordinatorContext protocol provides information about an in-progress view controller transition.
UIViewControllerTransitioningDelegate	An object that implements the UIViewControllerTransitioningDelegate protocol vends the objects used to manage a fixed-length or interactive transition between view controllers.
UIWebViewDelegate	The UIWebViewDelegate protocol defines methods that a delegate of a UIWebView object can optionally implement to intervene when web content is loaded.