// 创建 UIScrollview的Category 添加代码如下
#define IPHONE_H [UIScreen mainScreen].bounds.size.height //屏幕的高度
#define IPHONE_W [UIScreen mainScreen].bounds.size.width // 屏幕的宽度
//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
int location_X =0.15*IPHONE_W;
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 =IPHONE_W;
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;
}