Question

我尝试使用NSPageController创建向导。但我不明白我需要在委托方法中返回什么。我将navigateForward附加到我的按钮上，当我点击它时，我得到：

[__ NSArrayM objectAtIndex：]：索引1超出界限[0 .. 0]

class BoardAligmentPageController: NSPageController, NSPageControllerDelegate {

    var orderedViewControllers: [NSViewController] = {
        return [NSStoryboard(name: "Main", bundle:nil).instantiateController(withIdentifier: "BoardAligmentStep1ViewController") as! NSViewController,
                NSStoryboard(name: "Main", bundle:nil).instantiateController(withIdentifier: "BoardAligmentStep2ViewController") as! NSViewController,
                NSStoryboard(name: "Main", bundle:nil).instantiateController(withIdentifier: "BoardAligmentStep2ViewController") as! NSViewController,
                ]
    }()


    override func viewDidLoad() {
        super.viewDidLoad()

        delegate = self

        self.arrangedObjects = orderedViewControllers
    }


    func pageController(_ pageController: NSPageController, identifierFor object: Any) -> String {

        return "\(self.selectedIndex)"
    }

    func pageController(_ pageController: NSPageController, viewControllerForIdentifier identifier: String) -> NSViewController {
        return orderedViewControllers[Int(identifier)!]
    }
}

Answer 1

看起来您的orderedViewControllers属性实际上并未设置（因为您正在获得＆＃34;超出界限＆＃34;错误）。

不要使用该属性，而是尝试按需执行：

func pageController(_ pageController: NSPageController, identifierFor object: Any) -> String {

    print("\(self.selectedIndex)")

    switch(self.selectedIndex)
    {
    case 0 :
        return "BoardAligmentStep1ViewController"
    case 1 :
        return "BoardAligmentStep2ViewController"
    case 2 :
        return "BoardAligmentStep3ViewController"
    default :
        return "SomeDefaultViewController"
    }
}

func pageController(_ pageController: NSPageController, viewControllerForIdentifier identifier: String) -> NSViewController {
    return self.storyboard?.instantiateController(withIdentifier: identifier) as! NSViewController
}

NSPageController快速的例子

1 个答案: