通过self.view获得顶端的ViewController

- (UIViewController *) containingViewController {
UIView * target = self.superview ? self.superview : self;
return (UIViewController *)[target traverseResponderChainForUIViewController];
}

- (id) traverseResponderChainForUIViewController {
id nextResponder = [self nextResponder];
BOOL isViewController = [nextResponder isKindOfClass:[UIViewController class]];
BOOL isTabBarController = [nextResponder isKindOfClass:[UITabBarController class]];
if (isViewController && !isTabBarController) {
return nextResponder;
} else if(isTabBarController){
UITabBarController *tabBarController = nextResponder;
return [tabBarController selectedViewController];
} else if ([nextResponder isKindOfClass:[UIView class]]) {
return [nextResponder traverseResponderChainForUIViewController];
} else {
return nil;
}
}