UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panIt:)]; // 初始化手势类
[view addGestureRecognizer:panGesture]; // 将手势类添加给view
- (void)panIt:(UIPanGestureRecognizer *)panGesture
{
CGPoint pos = [pan locationInView:panGesture.view]; // 获取中心点
pan.state; // 手势状态
UIGestureRecognizerStatePossible,
UIGestureRecognizerStateBegan,
UIGestureRecognizerStateChanged,
....................
}
iOS开发 UIPanGestureRecognizer手势抽象类
原文：http://www.cnblogs.com/diweinan/p/4554589.html