Question

我想使用手势识别器捕捉鼠标和鼠标。但是，当捕获鼠标时，鼠标悬停永远不会被捕获。

这就是我的所作所为：

首先创建一个自定义MouseGestureRecognizer：

@implementation MouseGestureRecognizer
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {  
    [super touchesBegan:touches withEvent:event];  
    self.state = UIGestureRecognizerStateRecognized;  
}  

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {  
    [super touchesEnded:touches withEvent:event];  
    self.state = UIGestureRecognizerStateRecognized;  
}  
@end

然后将识别器绑定到视图控制器中的视图：

UIGestureRecognizer *recognizer = [MouseGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];  
[self.view addGestureRecognizer:recognizer];

当我在视图中单击鼠标时，会调用touchesBegan，但从不调用touchesEnded。是因为UIGestureRecognizerStateRecognized？

Answer 1

也许您可以使用UILongPressGestureRecognizer，而minimumPressDuration设置为0。

Answer 2

来自reset reset方法：

运行时之后调用此方法（UIGestureRecognizerStateRecognized）手势识别器状态已经存在设置为UIGestureRecognizerStateEnded 或UIGestureRecognizerStateRecognized。（...）在这之后调用方法，运行时忽略所有剩余的积极接触;那是，手势识别器不接收进一步更新的触摸开始但尚未结束。

所以，是的，这是因为您在touchesBegan中将状态设置为touchesBegan。

修改

作为一种变通方法，您可以制作两个识别器，一个用于touchesEnded，另一个用于UIGestureRecognizer *recognizer1 = [TouchDownGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)]; UIGestureRecognizer *recognizer2 = [TouchUpGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)]; [self.view addGestureRecognizer:recognizer1]; [self.view addGestureRecognizer:recognizer2];，然后将它们添加到目标视图中：

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iPhone SDK中用于鼠标向下和向上的手势识别器

2 个答案: