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UISwipeGestureRecognizer的设置方向
我想向基于视图的iPhone项目中添加简单的滑动手势识别。应当识别所有方向（右，下，左，上）的手势。 在UISwipeGestureRecognizer的文档中进行了说明： 您可以通过使用按位或操作数指定多个UISwipeGestureRecognizerDirection常量来指定多个方向。默认方向是UISwipeGestureRecognizerDirectionRight。 但是对我来说这是行不通的。对所有四个方向进行“或”运算后，只能识别左右滑动。 - (void)viewDidLoad { UISwipeGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight | UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionUp)]; [[self view] addGestureRecognizer:recognizer]; [recognizer release]; [super viewDidLoad]; } -(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer { NSLog(@"Swipe received."); } 我通过在视图中添加四个识别器来解决此问题，但我很想知道为什么它不能像文档中所宣传的那样起作用？ - (void)viewDidLoad { UISwipeGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer …