转载自:http://www.hangge.com/blog/cache/detail_1085.html
UITextField、UITextView组件系统原生就支持文字的复制,但有时我们需要让其他的一些组件也能实现复制功能,比如点击复制UILabel上的文字、UIImageView中的图片、UITableView里单元格的内容、或者点击按钮把文字或图片自动复制到粘贴板中等等。
这些我们借助 UIPasteboard 就可以实现。
一,将内容写入到剪贴板中
1,复制字符串
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UIPasteboard .generalPasteboard().string = "欢迎访问 hangge.com"
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2,复制字符串数组
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UIPasteboard .generalPasteboard().strings = [ "hellow" , "hangge.com" ]
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3,复制图片
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let image = UIImage (named: "logo.png" )
UIPasteboard .generalPasteboard().image = image
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4,复制二进制数据(NSData)
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let path = NSBundle .mainBundle().pathForResource( "logo" , ofType: "png" )!
let fileData = NSData (contentsOfFile: path)!
UIPasteboard .generalPasteboard().setData(fileData, forPasteboardType: "public.png" )
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注:从剪贴板获取二进制数据(NSData)
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let myData = UIPasteboard .generalPasteboard().dataForPasteboardType( "public.png" )
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二,常见组件增加复制功能
1,让文本标签(UILabel)支持复制功能
我们自定义一个可复制的标签类 UICopyLabel(继承UILabel),其内部能响应 Touch 事件并显示复制菜单
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import UIKit
class UICopyLabel : UILabel {
override init (frame: CGRect ) {
super . init (frame: frame)
sharedInit()
}
required init ?(coder aDecoder: NSCoder ) {
super . init (coder: aDecoder)
sharedInit()
}
func sharedInit() {
userInteractionEnabled = true
addGestureRecognizer( UILongPressGestureRecognizer (target: self ,
action: "showMenu:" ))
}
func showMenu(sender: AnyObject ?) {
becomeFirstResponder()
let menu = UIMenuController .sharedMenuController()
if !menu.menuVisible {
menu.setTargetRect(bounds, inView: self )
menu.setMenuVisible( true , animated: true )
}
}
//复制
override func copy (sender: AnyObject ?) {
let board = UIPasteboard .generalPasteboard()
board.string = text
let menu = UIMenuController .sharedMenuController()
menu.setMenuVisible( false , animated: true )
}
override func canBecomeFirstResponder() -> Bool {
return true
}
override func canPerformAction(action: Selector , withSender sender: AnyObject ?)
-> Bool {
if action == "copy:" {
return true
}
return false
}
} |
在这个文本标签上长按后便可以复制其内容:
2,让图片控件(UIImageView)支持复制、粘贴功能
我们自定义一个图片控件类 UICPImageView(继承UIImageView),内部同样添加Touch事件响应。该控件不仅支持复制,还支持粘贴。
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import UIKit
class UICPImageView : UIImageView {
override init (frame: CGRect ) {
super . init (frame: frame)
sharedInit()
}
required init ?(coder aDecoder: NSCoder ) {
super . init (coder: aDecoder)
sharedInit()
}
func sharedInit() {
userInteractionEnabled = true
addGestureRecognizer( UILongPressGestureRecognizer (target: self ,
action: "showMenu:" ))
}
func showMenu(sender: AnyObject ?) {
becomeFirstResponder()
let menu = UIMenuController .sharedMenuController()
if !menu.menuVisible {
menu.setTargetRect(bounds, inView: self )
menu.setMenuVisible( true , animated: true )
}
}
//复制
override func copy (sender: AnyObject ?) {
let board = UIPasteboard .generalPasteboard()
board.image = self .image
let menu = UIMenuController .sharedMenuController()
menu.setMenuVisible( false , animated: true )
}
//粘贴
override func paste(sender: AnyObject ?) {
let board = UIPasteboard .generalPasteboard()
self .image = board.image
let menu = UIMenuController .sharedMenuController()
menu.setMenuVisible( false , animated: true )
}
override func canBecomeFirstResponder() -> Bool {
return true
}
override func canPerformAction(action: Selector , withSender sender: AnyObject ?)
-> Bool {
if action == "copy:" {
return true
} else if action == "paste:" {
return true
}
return false
}
} |
下面我们在界面上添加两个 UICPImageView,我们可以把左边控件里的图片复制到右边控件中来,效果图如下:
3,让表格(UITableView)支持复制功能
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import UIKit
class ViewController : UIViewController , UITableViewDelegate , UITableViewDataSource {
var tableView: UITableView ?
var tableData = [ "条目1" , "条目2" , "条目3" , "条目4" , "条目5" , "条目6" , "条目7" ]
override func loadView() {
super .loadView()
}
override func viewDidLoad() {
super .viewDidLoad()
//创建表视图
self .tableView = UITableView (frame: self .view.frame, style:. Plain )
self .tableView!.delegate = self
self .tableView!.dataSource = self
//创建一个重用的单元格
self .tableView!.registerClass( UITableViewCell . self ,
forCellReuseIdentifier: "SwiftCell" )
self .view.addSubview( self .tableView!)
}
func tableView(tableView: UITableView , performAction action: Selector ,
forRowAtIndexPath indexPath: NSIndexPath , withSender sender: AnyObject ?) {
let board = UIPasteboard .generalPasteboard()
board.string = tableData[indexPath.row]
}
func tableView(tableView: UITableView , canPerformAction action: Selector ,
forRowAtIndexPath indexPath: NSIndexPath , withSender sender: AnyObject ?) -> Bool {
if action == "copy:" {
return true
}
return false
}
func tableView(tableView: UITableView ,
shouldShowMenuForRowAtIndexPath indexPath: NSIndexPath ) -> Bool {
return true
}
//在本例中,只有一个分区
func numberOfSectionsInTableView(tableView: UITableView ) -> Int {
return 1;
}
//返回表格行数(也就是返回控件数)
func tableView(tableView: UITableView , numberOfRowsInSection section: Int ) -> Int {
return tableData.count
}
//创建各单元显示内容(创建参数indexPath指定的单元)
func tableView(tableView: UITableView , cellForRowAtIndexPath indexPath: NSIndexPath )
-> UITableViewCell
{
//为了提供表格显示性能,已创建完成的单元需重复使用
let identify: String = "SwiftCell"
//同一形式的单元格重复使用,在声明时已注册
let cell = tableView.dequeueReusableCellWithIdentifier(identify,
forIndexPath: indexPath) as UITableViewCell
cell.accessoryType = UITableViewCellAccessoryType . DisclosureIndicator
cell.textLabel?.text = tableData[indexPath.row]
return cell
}
override func didReceiveMemoryWarning() {
super .didReceiveMemoryWarning()
}
} |
长按某个单元格即可复制这个单元格内容:
原文出自:www.hangge.com 转载请保留原文链接:http://www.hangge.com/blog/cache/detail_1085.html