iOS UILABEL \UIIMAGE複製
UIKit framework提供了幾個類和協議方便我們在自己的應用程式中實現剪貼簿的功能。
應用程式級:通過設定,可以讓資料在應用程式關閉之後仍然儲存在剪貼簿中,但是應用程式解除安裝之後資料就會失去。我們可用通過pasteboardWithName:create:來建立。
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">@interface UICopyLabel : UILabel @end #import "UICopyLabel.h" @implementation UICopyLabel @end </a>
為了能接收到事件(能成為第一響應者),我們需要覆蓋一個方法:
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">-(BOOL)canBecomeFirstResponder { return YES; } </a>
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">// 可以響應的方法 -(BOOL)canPerformAction:(SEL)action withSender:(id)sender { return (action == @selector(copy:)); } </a>
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">//針對於響應方法的實現 -(void)copy:(id)sender { UIPasteboard *pboard = [UIPasteboard generalPasteboard]; pboard.string = self.text; } </a>
有了以上三個方法,我們就能處理copy了,當然,在能接收到事件的情況下:
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">//UILabel預設是不接收事件的,我們需要自己新增touch事件 -(void)attachTapHandler { self.userInteractionEnabled = YES; //使用者互動的總開關 UITapGestureRecognizer *touch = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)]; touch.numberOfTapsRequired = 2; [self addGestureRecognizer:touch]; [touch release]; } //繫結事件 - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { [self attachTapHandler]; } return self; } //同上 -(void)awakeFromNib { [super awakeFromNib]; [self attachTapHandler]; } </a>
我們已經可以接收到事件了!由於我在上方將tap數設為2,所以需要雙擊才能捕獲,接下來,我們需要處理這個tap,以便讓選單欄彈出來:
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">-(void)handleTap:(UIGestureRecognizer*) recognizer { [self becomeFirstResponder]; UIMenuItem *copyLink = [[[UIMenuItemalloc] initWithTitle:@"複製" action:@selector(copy:)]autorelease]; [[UIMenuControllersharedMenuController] setMenuItems:[NSArrayarrayWithObjects:copyLink, nil]]; [[UIMenuControllersharedMenuController] setTargetRect:self.frameinView:self.superview]; [[UIMenuControllersharedMenuController] setMenuVisible:YESanimated: YES]; } </a>
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">-(BOOL)canPerformAction:(SEL)action withSender:(id)sender { return (action == @selector(copy:) || action == @selector(paste:)); } -(void)copy:(id)sender { UIPasteboard *pboard = [UIPasteboard generalPasteboard]; pboard.image = self.image; } -(void)paste:(id)sender { UIPasteboard *pboard = [UIPasteboard generalPasteboard]; self.image = pboard.image; } </a>
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">//需要提供一個唯一的名字,一般使用倒寫的域名:com.mycompany.myapp.pboard //後面的參數列示,如果不存在,是否建立一個 UIPasteboard *pb = [UIPasteboard pasteboardWithName:@"testBoard" create:YES]; </a>
使用這個貼上板,我們可以把文字存進去,然後在另一個app裡面讀出來,一些常用的型別已經被設定為屬性了:
<a target=_blank href="http://shop111849857.taobao.com/shop/view_shop.htm?spm=a1z0e.1.10010.4.Dadm77">//儲存資料 NSDictionary *dict = [NSDictionary dictionaryWithObject:textField.text forKey:@"content"]; NSData *dictData = [NSKeyedArchiver archivedDataWithRootObject:dict]; [pb setData:dictData forPasteboardType:@"myType"]; //獲取就類似於這樣: UIPasteboard *pb = [UIPasteboard pasteboardWithName:@"testBoard" create:YES]; NSDictionary *dict = [NSKeyedUnarchiver unarchiveObjectWithData:[pb dataForPasteboardType:@"myType"]]; caption.text = [dict objectForKey:@"content"]; </a>
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