我有一个 UIView 长按时会翻转。在模拟器中效果很好,但在现实世界中,人的手指在按下时会有微小的 Action 。这些微小的 Action 重置手势并立即触发手势结束状态。
- (void)viewDidLoad {
...
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(didLongPress:)];
longPress.minimumPressDuration = 0.7;
[self.view addGestureRecognizer:longPress];
}
- (void)didLongPress:(UILongPressGestureRecognizer *)gestureRecognizer {
if ( gestureRecognizer.state == UIGestureRecognizerStateBegan )
{
[UIView transitionFromView:self.questionCardView toView:self.answerCardView
duration:1.0
options:UIViewAnimationOptionTransitionFlipFromLeft
completion:nil];
}
else
{
[UIView transitionFromView:self.answerCardView toView:self.questionCardView
duration:1.0
options:UIViewAnimationOptionTransitionFlipFromRight
completion:^(BOOL finished){
[self.view addSubview:self.questionCardView];
[self.view sendSubviewToBack:self.questionCardView];
}];
}
}
最佳答案
您需要在手势识别器的处理程序中正确检查手势的状态。
尝试:
- (void)didLongPress:(UILongPressGestureRecognizer *)gestureRecognizer {
if ( gestureRecognizer.state == UIGestureRecognizerStateBegan )
{
[UIView transitionFromView:self.questionCardView toView:self.answerCardView
duration:1.0
options:UIViewAnimationOptionTransitionFlipFromLeft
completion:nil];
}
else if ( gestureRecognizer.state == UIGestureRecognizerStateEnded )
{
[UIView transitionFromView:self.answerCardView toView:self.questionCardView
duration:1.0
options:UIViewAnimationOptionTransitionFlipFromRight
completion:^(BOOL finished){
[self.view addSubview:self.questionCardView];
[self.view sendSubviewToBack:self.questionCardView];
}];
}
}
如您所见,
else
除了手势结束之外,每个小 Action 都会调用 block 。
关于iOS8 - 如何在 iOS 8 中更改长按手势的灵敏度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33192294/