如何在iPhone中將標簽拖放到UIToolbarItem上

Question

我面臨拖放UILabel的問題。

如何拖動標簽（“移動”）並放到UIToolBar項中的任何一項（即1或2或3 ...）上，按鈕標題應更改為標簽文本。

查看圖像以查看該問題

Answer 1

使用自定義按鈕作為標簽，然后將此代碼用作：

     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，您可以通過響應UIControlEventTouchDragInside事件，將臀部移動到任意位置，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];
        }
    }
}

希望對您有幫助。

Answer 2

UIBarButtonItem有它自己的標題，您不能在其上拖動標簽