Xcode:为什么我的翻转动画会翻转两次?

时间:2011-09-18 12:07:42

标签: xcode uigesturerecognizer flip

我有一点问题。我有一个UILabel,它有一个UILongPressGestureRecognicer。当调用UILongPressGestureRecognizer时,我的应用程序应该使用翻转动画切换到新视图。

这是我用于GestureRecognizer的代码:

UILongPressGestureRecognizer *labelLongPressRecognizer;
labelLongPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(LoadLabelSettings:)];

labelLongPressRecognizer.numberOfTouchesRequired = 1;
labelLongPressRecognizer.minimumPressDuration = 2.0;

[NewLabel addGestureRecognizer:labelLongPressRecognizer];

这是视图切换动画的代码:

CGContextRef context = UIGraphicsGetCurrentContext();

[UIView beginAnimations:nil context:context];
[UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight forView:self.view cache:NO];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];

[self.view addSubview:LabelSettingsViewController.view];

[UIView commitAnimations];

if (self.interfaceOrientation == UIInterfaceOrientationLandscapeRight || self.interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {

    LabelSettingsViewController.view.frame = CGRectMake(0, 0, 480, 300);

}

我的问题是,当我按住我的UILabel时,切换动画开始,但是当我释放它时,它会再次重复动画。所以基本上动画会出现两次,我只希望它发生一次。

有什么想法吗?

提前致谢:)

1 个答案:

答案 0 :(得分:1)

您是否正在检查发件人状态,例如,

- (void)LoadLabelSettings:(UILongPressGestureRecognizer *)sender 
{
    if (sender.state == UIGestureRecognizerStateEnded) // or whatever
        // then do the flipping stuff
}

查看“UILongPressGestureRecognizer类参考”的“概述”,其中讨论了长按连续,我假设可以触发许多事件:

http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UILongPressGestureRecognizer_Class/Reference/Reference.html