UIViewController实现 UIGestureRecognizerDelegate
if([UIDevice currentDevice].systemVersion.floatValue >= 7.0){
self.navigationController.interactivePopGestureRecognizer.delegate = self;
}
UIViewController实现 UIGestureRecognizerDelegate
if([UIDevice currentDevice].systemVersion.floatValue >= 7.0){
self.navigationController.interactivePopGestureRecognizer.delegate = self;
}