UIPasteboard粘贴板：UIlabel开启复制粘贴功能（一）

首先，因为苹果只放出来了 UITextView,UITextField,webView三个控件的剪贴板，所以一般控件的剪贴板都被禁用了，因此，我们首先要做的就是把这属性放出来，其实就是实现三个简单的方法，方法如下：

响应方法

- (BOOL)canBecomeFirstResponder{

returnYES;

}

//"反馈"关心的功能，即放出你需要的功能，比如你要放出copy，你就返回YES，否则返回NO；

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{

if (action ==@selector(copy:)){

returnYES;

}

else if (action ==@selector(paste:)){

return YES;

}

else if (action ==@selector(cut:)){

returnNO;

}

else if(action ==@selector(select:)){

returnNO;

}

else if (action ==@selector(delete:)){

returnNO;

}

return NO;

}

OK，开放控件的剪贴板功能已经放出，剩下的就是实现了

//UILabel默认是不接收事件的，我们需要自己添加touch事件

-(void)attachTapHandler{

self.userInteractionEnabled =YES;  //用户交互的总开关

UITapGestureRecognizer *touch = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(handleTap:)];

touch.numberOfTapsRequired =1;

[selfaddGestureRecognizer:touch];

[touch release];

}

响应点击事件

-(void)handleTap:(UIGestureRecognizer*) recognizer{

[selfbecomeFirstResponder];

UIMenuController *menu = [UIMenuControllersharedMenuController];

[menu setTargetRect:self.frameinView:self.superview];

[menu setMenuVisible:YESanimated:YES];

}

OK，此处已经可以点击出COPY菜单了，下面就是对你copy和paste的实现了

//针对于copy的实现

-(void)copy:(id)sender{

UIPasteboard *pboard = [UIPasteboardgeneralPasteboard];

pboard.string = self.text;

}

- (void)paste:(id)sender{

self.textAlignment =UITextAlignmentRight;

UIPasteboard *pboard = [UIPasteboardgeneralPasteboard];

self.text = [NSStringstringWithFormat:@"粘贴内容：%@",pboard.string];

NSLog(@"pboard.string : %@",pboard.string);

}