处理触摸事件和手势识别器

Question

我使用UISwipeGestureRecognizer和我的覆盖

-(void)touchesBegan...,-(void)touchesEnded...,-(void)touchesMoved... methods.

似乎touchesBegan和touchesMoved保持跟踪触摸，直到Swipe Gesture识别并且touchesEnded未被调用（与touchesCancelled相同）。但我需要轻扫手势识别器和触摸器才能完成这项工作，我该怎么办呢？

Answer 1

首先，将滑动手势识别器从库拖放到视图中。

然后检查项目在视图中取消。

编写代码以响应轻扫手势。

- (IBAction)swipe:(id)sender {
    v.backgroundColor = [UIColor blueColor];
}

然后，编写touch delegate方法。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch* touch = [touches anyObject];    
    CGPoint pt = [touch locationInView:self];
    layer.frame = CGRectMake(pt.x, pt.y, 100, 100);
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch* touch = [touches anyObject];    
    CGPoint pt = [touch locationInView:self];
    layer.frame = CGRectMake(pt.x, pt.y, 100, 100);
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    layer.frame = CGRectMake(0, 0, 100, 100);
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    self.backgroundColor = [UIColor redColor];
}

现在您可以在不取消的情况下移动图像，并且可以滑动屏幕以设置蓝色（成功识别滑动手势）。两者都可以。并且，当触摸结束时，窗口颜色变为红色。

您可以下载此示例项目并运行它：

https://github.com/weed/p120812_TouchAndGesture