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
1
|
UIPasteboard .generalPasteboard().string = "欢迎访问 hangge.com" |
2,复制字符串数组
1
|
UIPasteboard .generalPasteboard().strings = [ "hellow" , "hangge.com" ] |
3,复制图片
1
2
|
let image = UIImage (named: "logo.png" ) UIPasteboard .generalPasteboard().image = image |
4,复制二进制数据(NSData)
1
2
3
|
let path = NSBundle .mainBundle().pathForResource( "logo" , ofType: "png" )! let fileData = NSData (contentsOfFile: path)! UIPasteboard .generalPasteboard().setData(fileData, forPasteboardType: "public.png" ) |
注:从剪贴板获取二进制数据(NSData)
1
|
let myData = UIPasteboard .generalPasteboard().dataForPasteboardType( "public.png" ) |
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
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。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
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