Question

我有一个使用Parse创建PFLogInViewController的视图应用程序。在可以访问BeaconViewController之前，用户必须通过Facebook进行身份验证 - 这很正常。我的问题在于注销部分 - 在用户的会话被销毁之后，我需要重新出现PFLogInViewController。我尝试通过弹出RootViewController来实现这一点，但这并不能解决问题。

我引用了this个帖子以及this一个，但又没有运气。

以下是BeaconViewController.m，其中包含身份验证和注销逻辑

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    FBRequest *request = [FBRequest requestForMe];
    [request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
        if (!error) {
            [self dismissViewControllerAnimated:YES completion:nil];
            [self pictureRequest];
        }
        else if (error) {
            NSLog(@"facebook session was invalid");
            [self logoutButtonAction:nil];
            PFLogInViewController *login = [[PFLogInViewController alloc] init];
            login.fields = PFLogInFieldsFacebook;
            login.delegate = self;
            NSArray *permissionsArray = @[ @"user_about_me", @"user_relationships", @"user_birthday", @"user_location"];
            login.facebookPermissions = permissionsArray;
            [self presentViewController:login animated:YES completion:nil];
        }
        else {
            NSLog(@"Some other error: %@", error);
        }
    }];
}


- (IBAction)logoutButtonAction:(id)sender {
    [PFUser logOut];
    [self.navigationController popToRootViewControllerAnimated:YES];
}

enter image description here

Answer 1

尝试使用：

  [self.navigationController popViewControllerAnimated:YES];

Answer 2

将您的segue类型更改为推送。在IBAction操作方法中添加此行代码。

- (IBAction)logoutButtonAction:(id)sender
{
   [self.navigationController popViewControllerAnimated:YES];
}

Answer 3

我通过抽象将PFLogInViewController呈现为辅助方法并在注销时调用它的逻辑来解决这个问题。

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    FBRequest *request = [FBRequest requestForMe];
    [request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
        if (!error) {
            [self dismissViewControllerAnimated:YES completion:nil];
            [self pictureRequest];
        }
        else if (error) {
            NSLog(@"facebook session was invalid");
            [self logoutButtonAction:nil];
            [self presentPFLogInViewController];
        }
        else {
            NSLog(@"Some other error: %@", error);
        }
    }];
}

-(void)presentPFLogInViewController {
    PFLogInViewController *login = [[PFLogInViewController alloc] init];
    login.fields = PFLogInFieldsFacebook;
    login.delegate = self;
    NSArray *permissionsArray = @[ @"user_about_me", @"user_relationships", @"user_birthday", @"user_location"];
    login.facebookPermissions = permissionsArray;
    [self presentViewController:login animated:YES completion:nil];
}

- (IBAction)logoutButtonAction:(id)sender {
    [PFUser logOut];
    [self presentPFLogInViewController];
}

重新加载iOS视图控制器

3 个答案: