iphone - 未调用 UISwipeGestureRecognizer 选择器。知道为什么吗？

Question

我正在使用下面的代码将右/左滑动事件集成到 UIImageView 对象(称为 photo_view)，但在 iphone 模拟器和设备中测试后它不起作用。下面的方法 handleLeftSwipe 和 handleRightSwipe 甚至没有被调用，因为日志记录没有在调试器日志中打印任何它应该打印的内容。这是代码:

- (void)viewDidLoad
{
     [super viewDidLoad];

     UISwipeGestureRecognizer *leftSwipeRecognizer = [[UISwipeGestureRecognizer alloc]  initWithTarget:self action:@selector(handleLeftSwipe:)];
     leftSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
     leftSwipeRecognizer.numberOfTouchesRequired = 1;
     [photo_view addGestureRecognizer:leftSwipeRecognizer];
     leftSwipeRecognizer.delegate = self;
     [leftSwipeRecognizer release];

     UISwipeGestureRecognizer *rightSwipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSwipe:)];
     rightSwipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
     rightSwipeRecognizer.numberOfTouchesRequired = 1;
     [photo_view addGestureRecognizer:rightSwipeRecognizer];
     rightSwipeRecognizer.delegate = self;
     [rightSwipeRecognizer release];

}


- (void)handleLeftSwipe:(UISwipeGestureRecognizer *)recognizer
{
     NSLog(@"handleLeftSwipe called");
}

- (void)handleRightSwipe:(UISwipeGestureRecognizer *)recognizer
{
     NSLog(@"handleRightSwipe called");
}

知道是什么原因吗？

提前感谢您的帮助，

史蒂芬

Answer 1

UIImageView 实例默认 userInteractionEnabled 为 NO。尝试将其设置为 YES。