Question

我在UIView上使用了两个手势识别器。一个是标准UITapGestureRecognizer，另一个是我写的非常简单的触摸识别器：

@implementation TouchDownGestureRecognizer

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    if (self.state == UIGestureRecognizerStatePossible) {
        self.state = UIGestureRecognizerStateRecognized;
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    self.state = UIGestureRecognizerStateFailed;
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    self.state = UIGestureRecognizerStateFailed;
}

@end

只有当我将两个委托分配给包含此方法的委托时，它们才能协同工作：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

一切正常，但是当我对该视图执行长按时，触摸识别器触发并触摸识别器不会。对于短按，一切都很好，它们都会发射。

我在UIGestureRecognizerDelegate中实现了所有方法以返回YES无效。如果我正在添加日志以查看与委托的交互以及在我自己的识别器中，我可以看到，对于短按和长按，调用顺序是相同的 - 除了调用修饰识别器。我做错了什么？

Answer 1

为什么不直接从UILongPressGestureRecognizer？

查看touchUp

-(void)selectionDetected:(UILongPressGestureRecognizer*)longPress
{
    if(longPress.state==1)
    {
       //long Press is being held down
    }
    else if(longPress.state==3)
    {
        //the touch has been picked up
    }
}

同时使用触摸和触摸手势识别器

1 个答案: