iphone - UISwipeGestureRecognizer 手势起点

Question

是否可以从 UISwipeGestureRecognizer 获取手势起点。就像它在

中的可能性

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch * touch = [touches anyObject];
    gestureStartPoint = [touch locationInView:self];
}

Answer 1

根据UISwipeGestureRecognizer documentation你可以:

You may determine the location where a swipe began by calling the UIGestureRecognizer methods locationInView: and locationOfTouch:inView:. The former method gives you the centroid if more than one touch was involved in the gesture; the latter gives the location of a particular touch.

PS:你真的应该先看看文档，答案在UISwipeGestureRecognizer的类引用中，应该不难找到。作为开发人员的一部分是能够查找事物，Apple 拥有出色的文档，请使用它!