不能分配类型'() - >的值Void'键入'(() - > Void)!' [英] Cannot assign value of type '() -> Void' to type '(() -> Void)!'

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问题描述

在更新到xcode 8 beta 6之后,我收到错误

after updating to xcode 8 beta 6, I'm getting the error


无法分配'() - > '在以下func块中键入'(( - )Void)!'

Cannot assign value of type '() -> Void' to type '(() -> Void)!'

,第三行:

    // Button sub-class
public class SCLButton: UIButton {
    var actionType = SCLActionType.none
    var target:AnyObject!
    var selector:Selector!
    var action:(()->Void)!

    public init() {
        super.init(frame: CGRect.zero)
    }

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

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

//    required public init?(coder aDecoder: NSCoder) {
//        fatalError("init(coder:) has not been implemented")
//    }
}
public func addButton(_ title:String, action:()->Void)->SCLButton {
    let btn = addButton(title)
    btn.actionType = SCLActionType.closure
    btn.action = action // here is where the error occurs
    btn.addTarget(self, action:#selector(SCLAlertView.buttonTapped(_:)), for:.touchUpInside)
    btn.addTarget(self, action:#selector(SCLAlertView.buttonTapDown(_:)), for:[.touchDown, .touchDragEnter])
    btn.addTarget(self, action:#selector(SCLAlertView.buttonRelease(_:)), for:[.touchUpInside, .touchUpOutside, .touchCancel, .touchDragOutside] )
    return btn
}

any

推荐答案

似乎您的问题与此有关:
SE-0103

It seems your issue is related to this: SE-0103

尝试将您的 addButton(_:action:)的方法标题记录到:

Try chaging the method header of your addButton(_:action:) to:

public func addButton(_ title:String, action:@escaping ()->Void)->SCLButton {

来自新betas的诊断消息像往常一样令人困惑和不足,但使您的属性非可选 var action:() - > Void = {} 会给你一些更有用的信息。

The diagnostic messages from new betas are so confusing and inadequate as usual, but making your property simply non-Optional var action:()->Void = {} will give you a little more useful info.

这篇关于不能分配类型'() - >的值Void'键入'(() - > Void)!'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!

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