Ios performseguewithidentifier在一个viewDidLoad中工作，但在另一个viewDidLoad中不工作，使用；“显示”；赛格

以下是第一个viewDidLoad：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    if ([[NSUserDefaults standardUserDefaults] objectForKey:@"Tutorial"]) {
        [self performSegueWithIdentifier:@"fromTutorialToWelcome" sender:self];
    }else{
        [self setupVc];
    }
}

下面是第二个，在下面的视图控制器中：

- (void)viewDidLoad {
    [super viewDidLoad];
    if ([[NSUserDefaults standardUserDefaults] objectForKey:@"loginTesting"]) { //This evaluates to true, I double and triple checked.

        [self performSegueWithIdentifier:@"fromWelcomeToEntryPoint" sender:self];
    }else{
        [self setupVc];
    }
}

这两个序列都是Show序列，那么为什么第二个序列不起作用呢

编辑：强调segue的类型，因为它不再是iOS5

---

EDIT2：我想我没有正确地解释我想做什么。我希望在不显示第二个视图控制器的情况下显示第三个视图控制器。

当您从非运行状态打开应用程序时，每个视图只加载到内存中一次。在第二个视图控制器中，将其从viewDidLoad移动到ViewDidDisplay。我相信它会解决你的问题。如果没有，请告诉我，我将尝试调试它

编辑：

这是我做的一个工作示例

第一次： 第一视图控制器->第二视图控制器->第三视图控制器

第二次： FirstViewController->ThirdViewController（没有看到SecondViewController！）

FirstViewController.swift：

import UIKit

class FirstViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ToSecondPressed(sender: AnyObject) {

        if let skip = NSUserDefaults.standardUserDefaults().valueForKey("SkipSecond") as? Bool{

            let Third: ThirdViewController = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Third") as! ThirdViewController

            UIApplication.sharedApplication().delegate?.window??.rootViewController = Third
        }

        else{

            let Second: SecondViewController = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Second") as! SecondViewController

            NSUserDefaults.standardUserDefaults().setBool(true, forKey: "SkipSecond")
            UIApplication.sharedApplication().delegate?.window??.rootViewController = Second
        }

    }

}

import UIKit

class SecondViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ToThirdPressed(sender: AnyObject) {
        let Third = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Third") as? ThirdViewController

        UIApplication.sharedApplication().delegate?.window??.rootViewController = Third
    }


}

import UIKit

class ThirdViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

SecondViewController.swift：

import UIKit

class FirstViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ToSecondPressed(sender: AnyObject) {

        if let skip = NSUserDefaults.standardUserDefaults().valueForKey("SkipSecond") as? Bool{

            let Third: ThirdViewController = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Third") as! ThirdViewController

            UIApplication.sharedApplication().delegate?.window??.rootViewController = Third
        }

        else{

            let Second: SecondViewController = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Second") as! SecondViewController

            NSUserDefaults.standardUserDefaults().setBool(true, forKey: "SkipSecond")
            UIApplication.sharedApplication().delegate?.window??.rootViewController = Second
        }

    }

}

import UIKit

class SecondViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ToThirdPressed(sender: AnyObject) {
        let Third = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Third") as? ThirdViewController

        UIApplication.sharedApplication().delegate?.window??.rootViewController = Third
    }


}

import UIKit

class ThirdViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

ThirdViewController.swift：

import UIKit

class FirstViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ToSecondPressed(sender: AnyObject) {

        if let skip = NSUserDefaults.standardUserDefaults().valueForKey("SkipSecond") as? Bool{

            let Third: ThirdViewController = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Third") as! ThirdViewController

            UIApplication.sharedApplication().delegate?.window??.rootViewController = Third
        }

        else{

            let Second: SecondViewController = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Second") as! SecondViewController

            NSUserDefaults.standardUserDefaults().setBool(true, forKey: "SkipSecond")
            UIApplication.sharedApplication().delegate?.window??.rootViewController = Second
        }

    }

}

import UIKit

class SecondViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ToThirdPressed(sender: AnyObject) {
        let Third = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier("Third") as? ThirdViewController

        UIApplication.sharedApplication().delegate?.window??.rootViewController = Third
    }


}

import UIKit

class ThirdViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

---

会发生什么？你收到了什么信息？您是否在

prepareforsgue

中设置了断点或添加了日志记录？没有发生任何情况，应用程序不会移动到任何位置。我刚刚重写了PrepareForSegue，但它只有一个NSLogI。我不认为在viewDidLoad中执行分段是个好主意。现在还为时过早->虽然viewDidLoad只触发过一次，但这不应该成为问题，因为第二个ViewController在第一个segue启动之前不会实例化。而且，虽然ViewDidDisplay确实解决了导航问题，但我最终看到了第二个viewcontroller，我想避免它，并跳到我正在尝试的第三个viewcontrollerreach@Jargen89我在我的答案中添加了工作示例。这里的主键是操纵应用程序的窗口，并根据所需的viewController（第二个或第三个）进行分配。我不喜欢segues，更喜欢使用故事板的InstanceEviewController方法。。。