Initializer不会覆盖其超类中的指定初始值设定项 [英] Initializer does not override a designated initializer from its superclass

问题描述

所以我刚刚升级到Xcode 6.3 Beta 3，并且出现了很多与以下内容相关的错误：

So I've just upgraded to Xcode 6.3 Beta 3 and a lot of error(s) are appearing relating to the following:

初始化程序不会覆盖其超类中的指定初始值设定项。

Initializer does not override a designated initializer from its superclass.

override init() {
    super.init()
}

例如这是 UIButton class：

For example this is a UIButton class:

class CustomButton: UIButton {

    var target: AnyObject!
    var selector: Selector!
    var action: (() -> Void)!

    override init() { // Initializer does not override a designated initializer from its superclass
        super.init() // Must call a designated initializer of the superclass 'UIButton'
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
    }
}

这是我的 UIViewController 类之一：

class CustomAlertView: UIViewController {

    required init(coder aDecoder: NSCoder) {
        fatalError("NSCoding not supported")
    }

    required override init() { // Initializer does not override a designated initializer from its superclass
        super.init() // Must call a designated initializer of the superclass 'UIViewController'
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }
}

推荐答案

我的解决方案是一个快速修复，但我认为比发布说明中Apple的目的更容易。有关更多信息，请搜索19775924 http://adcdownload.apple.com//Developer_Tools/Xcode_6。这里有3_beta_3 / Xcode_6.3_beta_3_Release_Notes.pdf 。 Apple说的是你创建一个Objective-C文件并对其进行扩展（必须将其添加到头文件和所有文件中）并且它在Xcode 6.3 beta 3中的已知问题中，所以我认为很容易做我做的事情：

My solution is a quick fix, but I think is easier than what Apple purposes on the the Release Notes. For more information search for 19775924 http://adcdownload.apple.com//Developer_Tools/Xcode_6.3_beta_3/Xcode_6.3_beta_3_Release_Notes.pdf here. What Apple says is that you create an Objective-C file and extend it (having to add it to the header files and all) and it's on "Known Issues in Xcode 6.3 beta 3", so I think is easy to do what I did:

这是我为 UIButton修复它的方式：

class CustomButton : UIButton {
    init() {
        super.init(frame: CGRectZero)
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

这是我的一个ViewControllers（如果不需要则删除公共）：

And this is one of my ViewControllers (remove public if not needed):

public class GenericViewController: UIViewController {
    public init() {
        super.init(nibName: nil, bundle: nil)
    }

    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

我不喜欢使用IB所以我也有 UIView ，因为我将视图与 viewController 分开（如果不需要则删除public ）：

I don't use IB so I also have UIView, because I do separate the view from the viewController (remove public if not needed):

public class GenericMenuView: UIView {
    public init() {
        super.init(frame: CGRectZero)
    }

    public required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

我在视图中需要这个，因为我有 setupViews 我在init上调用的所有子类中重写的方法。并且使用AutoLayout我不需要任何帧（所以我不用frame参数覆盖init）。

I need this specially in views because I have a setupViews method that I override in all subclasses that is called on the init. And using AutoLayout I don't need any frames (so I don't override the init with the frame parameter).

所以看来你必须放弃倍率。哦!并且一定不要调用 self.init（），否则该类永远不会被初始化（并且在一些内部超时后它会崩溃）。

So it seems you have to drop override. Oh! and be sure to not call self.init() or the class is never initialized (and it crashes after some internal timeout).

这篇关于Initializer不会覆盖其超类中的指定初始值设定项的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！