概述：UIScreenEdgePanGestureRecognizer边缘手势，继承于UIPanGestureRecognizer类。官网上给的解释是手势需要从边缘开始拖动。相对于UIPanGestureRecognizer多了一个属性值。
指定起始边缘
@property (readwrite, nonatomic, assign) UIRectEdge edges;
屏幕的边缘类型
ypedef NS_OPTIONS(NSUInteger, UIRectEdge) {
/*没有边缘*/
UIRectEdgeNone = 0,
/*矩形顶部*/
UIRectEdgeTop = 1 << 0,
/*矩形左边*/
UIRectEdgeLeft = 1 << 1,
/*矩形底部*/
UIRectEdgeBottom = 1 << 2,
/*矩形右边*/
UIRectEdgeRight = 1 << 3,
/*矩形所有边*/
UIRectEdgeAll = UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight
} NS_ENUM_AVAILABLE_IOS(7_0);
案例
UIScreenEdgePanGestureRecognizer *screenEdgeRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(screenEdgeDetected:)];
/*设置边缘起点*/
screenEdgeRecognizer.edges = UIRectEdgeRight;
[self.image_view addGestureRecognizer: screenEdgeRecognizer];
/*方法实现*/
-(void) screenEdgeDetected :(UIScreenEdgePanGestureRecognizer *)screenEdge
{
/*获取拖动的位置*/
CGPoint point = [screenEdge translationInView:screenEdge.view];
/*每次都以传入的translation为起始参照*/
screenEdge.view.transform = CGAffineTransformTranslate(screenEdge.view.transform, point.x, 0);
/*设置当前拖动的位置*/
[screenEdge setTranslation:CGPointZero inView:screenEdge.view];
}
注：了解UIPanGestureRecognizer类请跳转//www.greatytc.com/p/1c72ede36e06
