获取根控制器

+ (UIViewController *)kzp_getRootViewController{
    UIWindow* window = nil;
    if (@available(iOS 13.0, *)) {
       for (UIWindowScene* windowScene in [UIApplication sharedApplication].connectedScenes){
           if (windowScene.activationState == UISceneActivationStateForegroundActive){
              window = windowScene.windows.firstObject;
               break;
          }
       }
   }else{
       #pragma clang diagnostic push
       #pragma clang diagnostic ignored "-Wdeprecated-declarations"
       // 这部分使用到的过期api
        window = [UIApplication sharedApplication].keyWindow;
       #pragma clang diagnostic pop
   }
    if([window.rootViewController isKindOfClass:NSNull.class]){
        return nil;
    }
    return window.rootViewController;
}