当PinchGesture处于活动状态时不调用RotationGesture
当PinchGesture处于活动状态时不调用RotationGesture
提问于 2014-03-04 00:58:53
我有drawingView和listen UIPanGestureRecognizer、UIRotationGestureRecognizer和UIPinchGestureRecognizer。
- (void)viewDidLoad
{
[super viewDidLoad];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
[self.drawingView addGestureRecognizer:panRecognizer];
UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateRecognizer:)];
[self.drawingView addGestureRecognizer:rotateRecognizer];
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRecognizer:)];
[self.drawingView addGestureRecognizer:pinchRecognizer];
[self.drawingView reloadData];
}
-(void) pinchRecognizer:(UIPinchGestureRecognizer*) recognizer {
return;
NSLog(@"Call scale");
}
- (void)rotateRecognizer:(UIRotationGestureRecognizer*)recognizer {
NSLog(@"Call rotaion");
}如果我只选择UIRotationGestureRecognizer或UIPinchGestureRecognizer，那就太完美了。但是如果使用UIRotationGestureRecognizer和UIPinchGestureRecognizer只调用UIPinchGestureRecognizer，则不会调用UIRotationGestureRecognizer。我的代码中有什么问题？我想我会做一个UISegmented来选择模式，UIRotationGestureRecognizer还是UIPinchGestureRecognizer，我应该怎么做？
非常感谢
回答 2
Stack Overflow用户
发布于 2014-03-04 01:00:55
如果您希望一次识别多个手势，请尝试使用gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer，例如：
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}编辑:除了在.h中包含委派之外，还要确保将UIGestureRecognizer的委派设置为self，例如：
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panDetected:)];
panRecognizer.delegate = self;
[self.drawingView addGestureRecognizer:panRecognizer];
UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateRecognizer:)];
rotateRecognizer.delegate = self;
[self.drawingView addGestureRecognizer:rotateRecognizer];Stack Overflow用户
发布于 2014-03-04 11:08:47
如果其他手势识别器未执行，则使用requireGestureRecognizerToFail:识别手势。
[rotateRecognizer requireGestureRecognizerToFail: pinchRecognizer];页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/22160816
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