ios – UISwipeGestureRecognizer只有一个方向可行

概述所以我用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 * 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documentation：

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;

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