如何顯示登錄和解除設置 - 故事板

Question

我想弄清楚如何顯示登錄（模態viewcontroller）從註銷按鈕和自動卸載設置（模態viewcontroller）從下面的登錄。您可能會看到故事板佈局：

http://cl.ly/2B3h0T130S1K1026201N

我試圖將此代碼添加到註銷方法SettingsViewController.m

- (IBAction)logoutAccount { 

     [self dismissModalViewControllerAnimated:YES]; 

     UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; 
     UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"]; 
     [vc setModalPresentationStyle:UIModalPresentationFullScreen]; 

     [self presentModalViewController:vc animated:YES]; 

} 

的問題是，它迫使我的應用程序凍結時，我點擊登出。有人知道它有什麼問題嗎？任何建議表示讚賞。

Answer 1

用戶再次登錄後，您希望應用程序在哪裏？假設您希望應用程序位於設置按鈕所在的視圖控制器（從故事板看起來如此）。

然後是VC（導航控制器根VC）可以做到這一點：

- (void)viewDidAppear:(BOOL)animated { 

    if (/*login is needed*/) { 
     UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; 
     UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"]; 
     [vc setModalPresentationStyle:UIModalPresentationFullScreen]; 

     [self presentModalViewController:vc animated:YES]; 
    } else { 
     // normal view did appear logic 
    } 
} 

註銷按鈕現在可以只是這樣做：

- (IBAction)logoutButtonPressed:(id)sender { 
    [self.navigationController popToRootViewControllerAnimated:NO]; 
}