ios - GameCenter 登录屏幕 - 取消按钮按下事件

Question

我展示了 GameCenter 登录屏幕:

GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) {
     if (viewController != nil) {
         [self presentViewController:gameCenterLoginController animated:YES completion:nil];
     }

我想在登录屏幕关闭后做一些事情。

可以通过两种方式关闭登录屏幕:

1. 用户登录成功
2. 用户关闭了登录屏幕

如何捕捉关闭登录屏幕事件(第二种方式)？

(不，UIViewController 生命周期方法不会像 viewDidAppear: 那样触发)

Answer 1

以下是我在项目中的做法:

GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) {
     if (viewController != nil) {
         [self presentViewController:gameCenterLoginController animated:YES completion:nil];
     }
     else if (localPlayer.isAuthenticated)
     {
       // user is authenticated -  do what next steps
     }
     else
     {
         NSLog(@“Local player is not authenticated or was canceled”);
         //do thing …
     }