解决由于UIScrollView或横向的UICollection

首先创建一个继承于UIScrollView的子类，然后在子类中重写以下方法即可：

//一句话总结就是此方法返回YES时，手势事件会一直往下传递，不论当前层次是否对该事件进行响应。

- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer*)otherGestureRecognizer {

if([self panBack:gestureRecognizer]) {

return YES;

}

return NO;

}

//location_X可自己定义,其代表的是滑动返回距左边的有效长度

- (BOOL)panBack:(UIGestureRecognizer*)gestureRecognizer {

//是滑动返回距左边的有效长度

intlocation_X =40;

if(gestureRecognizer ==self.panGestureRecognizer) {

UIPanGestureRecognizer*pan = (UIPanGestureRecognizer*)gestureRecognizer;

CGPointpoint = [pan translationInView:self];

UIGestureRecognizerStatestate = gestureRecognizer.state;

if(UIGestureRecognizerStateBegan== state ||UIGestureRecognizerStatePossible== state) {

CGPointlocation = [gestureRecognizer locationInView:self];

//这是允许每张图片都可实现滑动返回

inttemp1 = location.x;

inttemp2 =SCREEN_W;

NSIntegerXX = temp1 % temp2;

if(point.x>0&& XX < location_X) {

returnYES;

}

//下面的是只允许在第一张时滑动返回生效

//            if (point.x > 0 && location.x < location_X && self.contentOffset.x <= 0) {

//                return YES;

//            }

}

}

return NO;

}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer*)gestureRecognizer {

if([self panBack:gestureRecognizer]) {

return NO;

}

return YES;

}