iOS获取当前显示UIViewController视图

- (UIViewController *)getCurrentVC {
    UIViewController *result = nil;
    UIWindow * window = [[UIApplication sharedApplication] keyWindow];
    if (window.windowLevel != UIWindowLevelNormal) {
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for(UIWindow * tmpWin in windows) {
            if (tmpWin.windowLevel == UIWindowLevelNormal) {
                window = tmpWin;
                break;
            }
        }
    }
    UIView *frontView = [[window subviews] objectAtIndex:0];
    id nextResponder = [frontView nextResponder];
    if ([nextResponder isKindOfClass:[UIViewController class]]) {
        result = nextResponder;
    } else {
        result = window.rootViewController;
    }
    return result;
}

//登录接口
 UIViewController *juheVC = nil;
 UIWindow * window = [[UIApplication sharedApplication] keyWindow];
 if (window.windowLevel != UIWindowLevelNormal) {
 NSArray *windows = [[UIApplication sharedApplication] windows];
 for(UIWindow * tmpWin in windows) {
 if (tmpWin.windowLevel == UIWindowLevelNormal) {
 window = tmpWin;
 break;
 }
 }
 }
 UIView *frontView = [[window subviews] objectAtIndex:0];
 id nextResponder = [frontView nextResponder];
 if ([nextResponder isKindOfClass:[UIViewController class]]) {
 juheVC = nextResponder;
 } else {
 juheVC = window.rootViewController;
 }
 return juheVC;