属性未在super.init调用中初始化 [英] Property not initialized at super.init call

问题描述

我的视图控制器中有以下 init 方法：

I have the following init method in my view controller:

init(mainViewController: UIViewController, settingsViewController: UIViewController, gap: Int) {
        self.mainViewController = mainViewController
        self.settingsViewController = settingsViewController
        self.gap = gap

        self.setupScrollView() // I get error here

        super.init(nibName: nil, bundle: nil) //and here.
    }

self.setupScrollView 现在的方法看起来像这样：

The self.setupScrollView method for now just looks like this:

func setupScrollView() {
        self.scrollView = UIScrollView(frame: CGRectZero)
        self.scrollView.setTranslatesAutoresizingMaskIntoConstraints(false)
        self.view.addSubview(self.scrollView)
    }

我得到的错误是：

在super.init调用之前自己使用和属性'self.scrollView'未在super.init调用中初始化

我看过没有运气的类似帖子。任何帮助将不胜感激！

I've looked at similar post without any luck. Any help would be appreciated!

推荐答案

您可以通过声明 scrollView 作为可选项，并在 super.init 调用下移动设置方法调用。声明如下：

You can do it by declaring scrollView as optional and moving the setup method call below the super.init call. The declaration would look like this:

var scrollView : UIScrollView?

初始化：

init(mainViewController: UIViewController, settingsViewController: UIViewController, gap: Int) {
    //other stuff
    super.init(nibName: nil, bundle: nil)
    self.setupScrollView()
}

func setupScrollView() {
    scrollView = UIScrollView(frame: CGRectZero)
    scrollView!.setTranslatesAutoresizingMaskIntoConstraints(false)
    view.addSubview(scrollView!)
}

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