Question

我有一个接收捏手势的UIView。当我捏它时，似乎pinch事件排队，所以在我已经停止捏之后我仍然收到捏事件。我可以清除事件队列吗？如果有，怎么样？如果不是，我该怎么做以确保我的事件不排队？

我正在iOS 7上的iPad 4上进行测试。

捏合手势用于缩放屏幕上的图像。我注意到当我放大然后开始缩小而不释放屏幕时，事件排队。在开始缩小之前，图像仍会放大一些。我使用此功能根据我的手势缩放图像：

- (IBAction)pinch:(id)sender {
    NSLog(@"zooming");
    float s = [(UIPinchGestureRecognizer*)sender scale];
    s+=0.9*(1-s);

    CATransform3D old = photoView.layer.transform;

    //limit to 128*128 minimum
    if (photoView.frame.size.width * s < 128) s=(float)128/photoView.frame.size.width;
    if (photoView.frame.size.height * s < 128) s=(float)128/photoView.frame.size.height;

    //limit to 768*768 maximum
    if (photoView.frame.size.width * s > 768) s=(float)768/photoView.frame.size.width;
    if (photoView.frame.size.height * s > 768) s=(float)768/photoView.frame.size.height;

    CATransform3D new = CATransform3DScale(old,s,s,1);
    photoView.layer.transform = new;
}

//logs
2014-02-27 16:28:10.728 Medicatie Controle App[338:60b] zooming started
2014-02-27 16:28:10.730 Medicatie Controle App[338:60b] zooming ended
2014-02-27 16:28:10.745 Medicatie Controle App[338:60b] zooming started
2014-02-27 16:28:10.746 Medicatie Controle App[338:60b] zooming ended
2014-02-27 16:28:10.746 Medicatie Controle App[338:60b] zooming started

如何清除UIGestureRecognizer的事件队列？

0 个答案: