UISwipeGestureRecognizer 滑动长度 [英] UISwipeGestureRecognizer Swipe length

问题描述

知道是否有办法获得滑动手势或触摸的长度以便我可以计算距离吗?

Any idea if there is a way to get the length of a swipe gesture or the touches so that i can calculate the distance?

推荐答案

从滑动手势中获取距离是不可能的，因为当手势结束时， SwipeGesture 会触发您可以准确访问该位置一次的方法.
也许您想使用 UIPanGestureRecognizer.

It's impossible to get a distance from a swipe gesture, because the SwipeGesture triggers the method where you could access the location exactly one time, when the gesture has ended.
Maybe you want to use a UIPanGestureRecognizer.

如果您可以使用平移手势，您将保存平移的起点，如果平移已经结束，则计算距离.

If it possible for you to use pan gesture you would save the starting point of the pan, and if the pan has ended calculate the distance.

- (void)panGesture:(UIPanGestureRecognizer *)sender {
    if (sender.state == UIGestureRecognizerStateBegan) {
        startLocation = [sender locationInView:self.view];
    }
    else if (sender.state == UIGestureRecognizerStateEnded) {
        CGPoint stopLocation = [sender locationInView:self.view];
        CGFloat dx = stopLocation.x - startLocation.x;
        CGFloat dy = stopLocation.y - startLocation.y;
        CGFloat distance = sqrt(dx*dx + dy*dy );
        NSLog(@"Distance: %f", distance);
    }
}

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