视图在 Facebook 身份验证后延迟显示

Question

我使用以下代码在Facebook身份验证后显示吐司

if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) // check Fb is configured in Settings or not
{    
      accountStore = [[ACAccountStore alloc] init]; // you have to retain ACAccountStore
      ACAccountType *fbAcc = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
      NSString *key = @"xxxxx";
      NSDictionary *dictFB = [NSDictionary dictionaryWithObjectsAndKeys:key,ACFacebookAppIdKey,@[@"email"],ACFacebookPermissionsKey, nil];
      [accountStore requestAccessToAccountsWithType:fbAcc options:dictFB completion:^(BOOL granted, NSError *error) {
                            if (granted) {
                                NSLog(@"Perform fb registration");
                            } else {
                                NSLog(@"Facebook 1”);
                                [[Toast shared] showToast:self.view withText:@"You disabled your app from settings."];
                                NSLog(@"Facebook 2”);
                            }
                        }];
}

NSLog(@"Facebook 1”);和NSLog(@"Facebook 2”);分别执行和打印日志。但是，这两个日志之间的 toast 语句会在 15-20 秒后延迟和显示。

如果我将 toast 语句[[Toast shared] showToast:self.view withText:@"You disabled your app from settings."];以下完成处理程序中：

[accountStore requestAccessToAccountsWithType:fbAcc options:dictFB completion:^(BOOL granted, NSError *error) {
}];

它工作正常，及时显示吐司，从不拖延。有什么解决方案可以消除延迟吗？

Answer 1

我相信EDUsta说的是正确的。尝试在主线程上调用 Toast 消息。所有 UI 更改都应在主线程上处理，以避免奇怪的错误。试试这个：

[accountStore requestAccessToAccountsWithType:fbAcc options:dictFB completion:^(BOOL granted, NSError *error) {
        if (granted) {
            NSLog(@"Perform fb registration");
        } else {
            NSLog(@"Facebook 1”);
                  dispatch_async(dispatch_get_main_queue(), ^{
                    [[Toast shared] showToast:self.view withText:@"You disabled your app from settings."];
            });
                  NSLog(@"Facebook 2”);
                        }
                        }];