我需要检测我的滑动手势的方向，但我遇到了问题。手势有效，但我不知道如何检测方向。
...
swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(detectSwipe:)];
[swipeGesture setNumberOfTouchesRequired:1];
[swipeGesture setDirection:UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionUp];
[appView addGestureRecognizer:swipeGesture];
-(void)detectSwipe:(UISwipeGestureRecognizer *)recognizer {
switch (recognizer.direction) {
case UISwipeGestureRecognizerDirectionUp:
NSLog(@"smth1");
break;
case UISwipeGestureRecognizerDirectionDown:
NSLog(@"smth2");
default:
break;
}
}
它不起作用：/
这是我的一个项目的示例：
// ...
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeLeft];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeRight];
UISwipeGestureRecognizer *swipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeUp.direction = UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:swipeUp];
UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(didSwipe:)];
swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:swipeDown];
// ...
- (void)didSwipe:(UISwipeGestureRecognizer*)swipe{
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(@"Swipe Left");
} else if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(@"Swipe Right");
} else if (swipe.direction == UISwipeGestureRecognizerDirectionUp) {
NSLog(@"Swipe Up");
} else if (swipe.direction == UISwipeGestureRecognizerDirectionDown) {
NSLog(@"Swipe Down");
}
}
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