iOS-擷取當前螢幕顯示的ViewController

iOS-擷取當前螢幕顯示的ViewController

//擷取當前螢幕顯示的ViewController- (UIViewController *)getCurrentVC{    UIViewController *result = nil;    UIWindow * window = [[UIApplication sharedApplication] keyWindow];    if (window.windowLevel != UIWindowLevelNormal)    {        NSArray *windows = [[UIApplication sharedApplication] windows];        for(UIWindow * tempWindow in windows)        {            if (tempWindow.windowLevel == UIWindowLevelNormal)            {                window = tempWindow;                break;            }        }    }    UIView *frontView = [[window subviews] objectAtIndex:0];    id nextResponder = [frontView nextResponder];    if ([nextResponder isKindOfClass:[UIViewController class]])        result = nextResponder;    else        result = window.rootViewController;    return result;}