所以我用pageControl创建一个页面(它是一个带有多个视图的页面,带有指示您所在页面的点),我的代码在viewDidLoad中如下所示：
UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)]; UIView *temp = [[UIView alloc]initWithFrame:self.view.frame]; temp.backgroundColor = [UIColor clearColor]; [temp addGestureRecognizer:swipe]; [self.view addSubview:temp];
在swipeAction选择器中我有：
- (void)swipeAction: (UISwipeGestureRecognizer *)sender{
NSLog(@"Swipe action called");
if (sender.direction == UISwipeGestureRecognizerDirectionLeft) {
//Do Something
}
else if (sender.direction == UISwipeGestureRecognizerDirectionRight){
//Do Something Else
}
}
令我惊讶的是,此方法仅在您向右滑动时起作用(即,如果调用块,则为else).向左滑动时,swipeAction甚至不会被调用！这很奇怪,为什么会发生这种情况,我该如何更改代码？任何回复表示赞赏.非常感谢！
解决方法
这里有一些你应该注意的事情.首先,您必须为要观察的每个方向创建一个手势.这不是什么大问题,因为你可以简单地给他们相同的选择器,它就像一个两个方向的手势.
UISwipeGestureRecognizer *leftSwipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)]; leftSwipe.direction = UISwipeGestureRecognizerDirectionLeft; UISwipeGestureRecognizer *rightSwipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipeAction:)]; rightSwipe.direction = UISwipeGestureRecognizerDirectionRight; UIView *temp = [[UIView alloc]initWithFrame:self.view.frame]; temp.backgroundColor = [UIColor clearColor]; [temp addGestureRecognizer:leftSwipe]; [temp addGestureRecognizer:rightSwipe]; [self.view addSubview:temp];
其次,你从未指定手势的方向,使其默认为右(或方向枚举为1)
从@L_403_0@：
The default direction is UISwipeGestureRecognizerDirectionRight. See descriptions of UISwipeGestureRecognizerDirection constants for more information.
typedef enum {
UISwipeGestureRecognizerDirectionRight = 1 << 0,UISwipeGestureRecognizerDirectionLeft = 1 << 1,UISwipeGestureRecognizerDirectionUp = 1 << 2,UISwipeGestureRecognizerDirectionDown = 1 << 3
} UISwipeGestureRecognizerDirection;