如何在iphone的UIToolbarItem上拖放标签

Question

我遇到了拖放UILabel的问题。

如何拖拽标签(Move This)并拖放到任何一个UIToolBar项目上(例如，1、2或3...)该按钮标题应更改为标签文本。

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Answer 1

使用自定义按钮作为标签，然后使用以下代码：

     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，您可以通过响应UIControlEventTouchDragInside事件将臀部移动到您想要的任何位置，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];
        }
    }
}

希望能对你有所帮助。

Answer 2

UIBarButtonItem有它自己的标题，你不能在上面拖拽标签