如何拖動標籤並放在UIToolbarItem中iphone

Question

我面臨着拖放UILabel的問題。

如何拖動標籤（Move This）並放在UIToolBar項目（即1或2或3 ...）中的任何一個上，該按鈕標題應該作爲標籤文本而改變。

Check image for this question

Answer 1

的UIBarButtonItem有它自己的標題，你不能把它拖到標籤

Answer 2

使用自定義按鈕，一個標籤，然後使用此代碼：

 UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
     [button addTarget:self action:@selector(btnTouch:withEvent:) forControlEvents:UIControlEventTouchDown]; 
    button.tag = -1; 
button.titleLabel.text = @"Move this"; 
     [button addTarget:self action:@selector(btnTouch:withEvent:) forControlEvents:UIControlEventTouchDragInside]; 
     [self.view addSubview:button]; 

，那麼你可能通過響應UIControlEventTouchDragInside事件移動Buttol，例如：

- (IBAction) btnTouch:(id) sender withEvent:(UIEvent *) event 
{ 
    CGPoint point = [[[event allTouches] anyObject] locationInView:self.view]; 
    UIControl *control = sender; 
    control.center = point; 

    //Here use this to check when intersects and check if the frame of the item you are moving intersects with the frame from on of your subviews 
    for (UIView *anotherBtn in self.view.subviews) { 

     if (CGRectIntersectsRect(control.frame, anotherBtn.frame)) { 
      // Do something 
      [anotherBtn setTitle:control.titleLabel.text]; 
     } 
    } 
} 

希望它可以幫助你。