本文转载至 http://blog.csdn.net/learnios/article/details/8442201
1. iOS开发中使用[[UIApplication sharedApplication] openURL:] 加载其它应用
在iOS开发中,经常需要调用其它App,如拨打电话、发送邮件等。UIApplication:openURL:方法是实现这一目的的最简单方法,该方法一般通过提供的url参数的模式来调用不同的App。
通过openURL方法可以调用如下应用:
调用浏览器(Safari Browser)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http:google.com"]];
调用谷歌地图(Google Maps)
- NSString *addressText = @"7 Hanover Square, New York, NY 10004";
- //stringByAddingPercentEscapesUsingEncoding为数据转换,7%20Hanover%20Square%20New%20York%20%NY%2010004
- addressText = [addressText stringByAddingPercentEscapesUsingEncoding: NSASCIIStringEncoding];
- NSString* urlText = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@", addressText];
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlText]];
调用邮件客户端(Apple Mail)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto://devprograms@apple.com"]];
拨号(Phone Number)
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"tel://6463777303"]];
调用短信(SMS)
调用应用商店(AppStore)
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=291586600&mt=8"]];
2. NSUserDefaults读取和写入自定义对象
- NSString *string = [NSString stringWithString @"data is here"];
- NSUserDefaults *data = [NSUserDefaults standardUserDefaults];
- [data setObject:string forKey:@"key"];
- NSString *value;
- value = [data objectForKey:"key"];
但是并不是所有的东西都能往里放的。NSUserDefaults只支持: NSString, NSNumber, NSDate, NSArray, NSDictionary.
3. protocol 和 delegate 回调函数传值
一、说明
1.协议声明了可以被任何类实现的方法
2.协议不是类,它是定义了一个其他对象可以实现的接口
3.如果在某个类中实现了协议中的某个方法,也就是这个类实现了那个协议。
4.协议经常用来实现委托对象。一个委托对象是一种用来协同或者代表其他对象的特殊对象。
5:委托,就是调用自己定义方法,别的类来实现。
6.新特性说明
@optional预编译指令:表示可以选择实现的方法
@required预编译指令:表示必须强制实现的方法
二、定义
.h
- @protocol ContactCtrlDelegate
- - (void)DismissContactsCtrl;
- - (void)CallBack:(NSString *)str; //回调传值
- @end
- @interface ContactsCtrl : UIViewController {
- id <ContactCtrlDelegate> delegate;
- }
- @property (nonatomic, assign) id <ContactCtrlDelegate> delegate;
.m
- @synthesize delegate;
三、Demo
二级窗口(子窗口)UIViewController subclass
- 1 Textfield
- 1 Button
1、ContactsCtrl.h
- #import <UIKit/UIKit.h>
- //定义协议
- @protocol ContactCtrlDelegate
- - (void)DismissContactsCtrl; //回调关闭窗口
- - (void)CallBack:(NSString *)str; //回调传值
- @end
- @interface ContactsCtrl : UIViewController
- {
- __weak IBOutlet UITextField *passData; //textfield
- id <ContactCtrlDelegate> delegate; //开放delegate
- NSString *passedVal; //从主窗口获取传值
- }
- @property(nonatomic,retain)id <ContactCtrlDelegate> delegate;
- @property(nonatomic,retain)NSString *passedVal;
- - (IBAction)cancelBtn:(id)sender;
- @end
2、ContactsCtrl.m
- @implementation ContactsCtrl
- @synthesize delegate;
- @synthesize passedVal;
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- // Do any additional setup after loading the view from its nib.
- passData.text = passedVal;
- }
- //调用协议中的方法
- - (IBAction)cancelBtn:(id)sender
- {
- [delegate CallBack:[NSString stringWithFormat:@"%@",passData.text]];
- [delegate DismissContactsCtrl];
- }
一级窗口(父窗口)
- 1 Textfield
- 1 Button
3、ViewController.h
- #import <UIKit/UIKit.h>
- #import "ContactsCtrl.h" //引入二级文件
- @interface ViewController : UIViewController <ContactCtrlDelegate>
- {
- ContactsCtrl *contactsView; //定义
- __weak IBOutlet UITextField *textfield;
- }
- @property(nonatomic,retain) ContactsCtrl *contactsView;
- - (IBAction)addContactsView:(id)sender;
- @end
4、ViewController.m
- @implementation ViewController
- @synthesize contactsView;
- - (IBAction)addContactsView:(id)sender
- {
- ContactsCtrl *contactView = [[ContactsCtrl alloc] initWithNibName:nil bundle:nil];
- self.contactsView = contactView;
- contactsView.delegate = self; //设置委托
- contactsView.passedVal = textfield.text;
- [self presentModalViewController:contactsView animated:YES];
- }
- //实现ContactCtrlDelegate协议中的方法
- - (void)DismissContactsCtrl
- {
- [contactsView dismissModalViewControllerAnimated:YES];
- }
- - (void)CallBack:(NSString *)str
- {
- textfield.text = str;
- }