Question

我遇到拖放UILabel的问题。

如何拖动标签（Move This）并放下任何一个UIToolBar项目（即1或2或3 ...）按钮标题应更改为标签文本。

Answer 1

使用自定义按钮作为标签，然后将此代码用作：

     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];

然后你可以通过响应UIControlEventTouchDragInside事件来移动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];
        }
    }
}

希望它对你有所帮助。

Answer 2

UIBarButtonItem拥有自己的标题，你不能在其上拖动标签

如何拖动标签并放在iPhone的UIToolbarItem上

2 个答案: