dismissViewControllerAnimated：完成：推到另一個ViewController

Question

我只是想知道是否有可能推遲到一個ViewController權利後，我駁回了一個。

我一直在試圖用這樣的：

 -(void)dismiss{ 
    //send information to database here 

    [self dismissViewControllerAnimated:YES completion:^{ 
        NSLog(@"Dismiss completed"); 
        [self pushtoSingle:post_id]; 
       }]; 
} 

-(void)pushtoSingle:(int)post_id{ 
    Single1ViewController *svc = [self.storyboard instantiateViewControllerWithIdentifier:@"SingleView"]; 
    svc.post_id = post_id; 
    svc.page = 998; 
    [self.navigationController pushViewController:svc animated:YES]; 
} 

這：

-(void)dismiss{ 

//send information to database here 

[self dismissViewControllerAnimated:YES completion:^{ 
        NSLog(@"Dismiss completed"); 
        Single1ViewController *svc = [self.storyboard instantiateViewControllerWithIdentifier:@"SingleView"]; 
        svc.post_id = post_id; 
        svc.page = 998; 
        [self.navigationController pushViewController:svc animated:YES]; 
       }]; 
} 

，但沒有成功。視圖成功解除了，但推送從未初始化.. 是否有另一種已知的解決方法？

Answer 1

是的，我想它了。我只是張貼了通知我被解僱後的視圖控制器B到A，然後在收到該通知，並推到C .. B中

解聘：

[self dismissViewControllerAnimated:YES completion:^{ 

    [[NSNotificationCenter defaultCenter] postNotificationName:@"pushToSingle" object:nil userInfo:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:post_id1] forKey:@"post_id"]]; 
}]; 

在接收：

-(void)viewWillAppear:(BOOL)animated{ 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(pushToSingle:) name:@"pushToSingle" object:nil]; 
} 

-(void)pushToSingle:(NSNotification *)notis{ 
    NSDictionary *dict = notis.userInfo; 
    int post_id = [[dict objectForKey:@"post_id"] intValue]; 

    NSLog(@"pushing to single"); 
    Single1ViewController *svc = [self.storyboard instantiateViewControllerWithIdentifier:@"SingleView"]; 
    svc.post_id = post_id; 
    svc.page = 998; 
    [self.navigationController pushViewController:svc animated:YES]; 

} 

謝謝，Jacky Boy！

Answer 2

取出動畫。像這樣：

[self dismissViewControllerAnimated:NO completion:^{ 
       NSLog(@"Dismiss completed"); 
       [self pushtoSingle:post_id]; 
      }]; 

我有多個動畫會產生奇怪行爲的情況。

編輯1.0：

試試這個：

[self performSelector:@selector(pushtoSingle:) withObject:post_id afterDelay:0.3]; 

編輯2.0：

剛纔通知...你是你的解僱和UIViewController你正在試圖推剛剛被解僱的新人UIViewController。從理論上講，在這裏：

[self dismissViewControllerAnimated:YES completion:^{ 
        NSLog(@"Dismiss completed"); 
        [self pushtoSingle:post_id]; 
       }]; 

在您完成塊，self將是零，因爲你剛剛駁回。從目前的UIViewController推新的UIViewController。例如，如果你目前UIViewController是B：

A -> B 

解僱後：

A 

推新：

A -> C 

Answer 3

這更多的只是添加到上面提供的機器人6提供的答案。

如果您打算將新視圖添加爲子視圖，那麼您應該考慮在父視圖中添加以下內容。

-(void)viewDidDisappear:(BOOL)animated{ 
    [[NSNotificationCenter defaultCenter] removeObserver:self]; 

} 

在我來說，我是通過NSDictionary.Then我接受AlertView後再次呈現相同的子視圖通知推出基於斷爲int的AlertView傳回。

-(void)pushToSingle:(NSNotification *)notis{  
NSDictionary *dict = notis.userInfo; 
     int post_id = [[dict objectForKey:@"post_id"] intValue]; 
     NSLog(@"%d", post_id); 


     if (post_id == 1) { 
      UIAlertView *alert = [[UIAlertView alloc] 

            initWithTitle:@"Sign Up" 
            message:@"Are you sure you want to cancel?" 
            delegate:self 
            cancelButtonTitle:@"Cancel" 
            otherButtonTitles: @"Accept", nil]; 
      alert.tag = 1; 
      post_id = 4; 
      [alert show]; 
     } 
} 

繼承人發生了什麼事。

因此，通過上面的答案，我瞭解到，基本上任何你在視圖做會在你的子視圖又來了，好像它仍然在你的父視圖，你永遠不會被刪除的NSNotification觀察者和觀察員仍然活躍。

現在，這可能不會導致每個人的問題，但如果你不真的需要它，它會吃掉系統資源，因爲ARC不會釋放觀察者，直到父視圖不再活動或除非你告訴它在你的viewDidDisapper

Answer 4

類別：

class Category { 
    var name: String = "" 
} 

FirstViewController：

class FirstViewController: UIViewController { 

    func addNewCategory() { 
     let category = Category() 

     let secondViewController = SecondViewController(category: category) 

     secondViewController.didCreateCategory = { (category: Category) in 
      let thirdViewController = ThirdViewController(category: category) 
      self.navigationController?.pushViewController(thirdViewController, animated: true) 
     } 

     let secondNavigationController = UINavigationController(rootViewController: secondViewController) 
     presentViewController(secondNavigationController, animated: true, completion: nil) 
    } 

} 

SecondViewController：

class SecondViewController: UIViewController { 

    @IBOutlet weak var categoryNameTextField: UITextField! 
    var didCreateCategory: ((category: Category) ->())? 
    var category: Category 

    init(category: Category) { 
     self.category = category 
     super.init(nibName: nil, bundle: nil) 
    } 

    convenience required init(coder aDecoder: NSCoder) { 
     self.init(coder: aDecoder) 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .Add, 
      target: self, action: "createCategory") 
    } 

    func createCategory() { 
     dismissViewControllerAnimated(true, completion: { 
      self.category.name = self.categoryNameTextField.text 
      self.didCreateCategory!(category: self.category) 
     }) 
    } 

} 

ThirdViewController：

class ThirdViewController: UIViewController { 
    var category: Category 

    init(category: Category) { 
     self.category = category 
     super.init(nibName: nil, bundle: nil) 
    } 

    convenience required init(coder aDecoder: NSCoder) { 
     self.init(coder: aDecoder) 
    } 
}