侧滑返回与scrollView冲突

建一个scrollView的分类（category），重写代理方法让手势能够传递下去

在.m文件中

#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width

//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

int location_X =0.13*SCREEN_WIDTH;

if (gestureRecognizer ==self.panGestureRecognizer) {

UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;

CGPoint point = [pan translationInView:self];

UIGestureRecognizerState state = gestureRecognizer.state;

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

CGPoint location = [gestureRecognizer locationInView:self];

//这是允许每张图片都可实现滑动返回

int temp1 = location.x;

int temp2 =SCREEN_WIDTH;

NSInteger XX = temp1 % temp2;

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

return YES;

}

//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;

}