iOS7下滑动返回与ScrollView共存二三事

 1 //我是一个NavigationController的派生类
 2 - (id)initWithRootViewController:(UIViewController *)rootViewController
 3 {
 4     self = [super initWithRootViewController:rootViewController];
 5     if (self)
 6     {
 7         //在naviVC中统一处理栈中各个vc是否支持滑动返回的情况
 8         //当前仅最底层的vc关闭滑动返回
 9         self.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;
10     }
11     
12     return self;
13 }

 1 - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
 2 {
 3     if (self.viewControllers.count == 1)//关闭主界面的右滑返回
 4     {
 5         return NO;
 6     }
 7     else
 8     {
 9         return YES;
10     }
11 }

1 // called when the recognition of one of gestureRecognizer or otherGestureRecognizer would be blocked by the other
2 // return YES to allow both to recognize simultaneously. the default implementation returns NO (by default no two gestures can be recognized simultaneously)
3 //
4 // note: returning YES is guaranteed to allow simultaneous recognition. returning NO is not guaranteed to prevent simultaneous recognition, as the other gesture‘s delegate may return YES
5 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;

1 // Use these accessors to configure the scroll view‘s built-in gesture recognizers.
2 // Do not change the gestures‘ delegates or override the getters for these properties.
3 @property(nonatomic, readonly) UIPanGestureRecognizer *panGestureRecognizer NS_AVAILABLE_IOS(5_0);

 1 @implementation UIScrollView (AllowPanGestureEventPass)
 2 
 3 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 4 {
 5     if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]
 6         && [otherGestureRecognizer isKindOfClass:[UIScreenEdgePanGestureRecognizer class]])
 7     {
 8         return YES;
 9     }
10     else
11     {
12         return  NO;
13     }
14 }

// create a relationship with another gesture recognizer that will prevent this gesture‘s actions from being called until otherGestureRecognizer transitions to UIGestureRecognizerStateFailed
// if otherGestureRecognizer transitions to UIGestureRecognizerStateRecognized or UIGestureRecognizerStateBegan then this recognizer will instead transition to UIGestureRecognizerStateFailed
// example usage: a single tap may require a double tap to fail
- (void)requireGestureRecognizerToFail:(UIGestureRecognizer *)otherGestureRecognizer;

[_scrollView.panGestureRecognizer requireGestureRecognizerToFail:screenEdgePanGestureRecognizer];

- (UIScreenEdgePanGestureRecognizer *)screenEdgePanGestureRecognizer
{
    UIScreenEdgePanGestureRecognizer *screenEdgePanGestureRecognizer = nil;
    if (self.view.gestureRecognizers.count > 0)
    {
        for (UIGestureRecognizer *recognizer in self.view.gestureRecognizers)
        {
            if ([recognizer isKindOfClass:[UIScreenEdgePanGestureRecognizer class]])
            {
                screenEdgePanGestureRecognizer = (UIScreenEdgePanGestureRecognizer *)recognizer;
                break;
            }
        }
    }

    return screenEdgePanGestureRecognizer;
}