社区首页 >问答首页 >“下一步”按钮在“快捷键”中显示未知的错误。

问“下一步”按钮在“快捷键”中显示未知的错误。
EN

Stack Overflow用户

提问于 2014-12-26 07:48:27

回答 1查看 192关注 0票数 0

我有一个游戏控制器，它从第一视图控制器获得两个值。即selectedlevelnumber和nextlevelnumber.当当前级别完成时，我想显示下一个级别按钮。因此，下一级按钮显示的是级别何时完成，但单击next级别按钮会给出未知的错误，控制台表示lldb，并带我到AppDelegate.swift。我的GameViewController中有这段代码

if levelisCompleted == true {
LevelCompletedView().levelcomplete(selectedlevelnumber, nextlevel: nextlevelnumber)
} .. this is working perfectly

这是我的LevelCompletedView

class LevelCompletedView: UIViewController {

    func levelcomplete(levelnum:String, nextlevel:String) {

        println("\(levelnum) is completed ")
        println("next level is \(nextlevel)")

        var button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
        button.frame = CGRectMake(10, 10, 200, 50)
        button.backgroundColor = UIColor.greenColor()
        button.setTitle("Next Level", forState: UIControlState.Normal)
        button.addTarget(self, action: "buttonA:", forControlEvents: UIControlEvents.TouchUpInside)
        gamesubView.addSubview(button)


        func buttonA(sender:UIButton!) {
            println("loading next level \(nextlevel)")
            let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            var gameview = self.storyboard?.instantiateViewControllerWithIdentifier("gamevc") as GameViewController
            gameview.levelSelectedNum = String(nextlevel)

            self.presentViewController(gameview, animated: true, completion: nil)

        }
    }
}

一切正常，只有按钮在点击时不起作用。

uistoryboard

ios

xcode

swift

回答 1

Stack Overflow用户

发布于 2014-12-26 09:00:13

现在看来，buttonA:方法是本地的，因为它包含在levelComplete中，所以一旦levelComplete完成执行，buttonA:函数就消失了。您的按钮没有识别它的目标动作buttonA:，因为它没有在其类的范围内定义--因此产生了错误。将func buttonA移出levelComplete以纠正此问题。

要访问nextlevel，请将其保存为全局变量，例如。

class LevelCompletedView: UIViewController {

    var nextLevelVar:String!

    func levelcomplete(levelnum:String, nextlevel:String) {

        println("\(levelnum) is completed ")
        println("next level is \(nextlevel)")

        nextLevelVar = nextlevel

        var button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
        button.frame = CGRectMake(10, 10, 200, 50)
        button.backgroundColor = UIColor.greenColor()
        button.setTitle("Next Level", forState: UIControlState.Normal)
        button.addTarget(self, action: "buttonA:", forControlEvents: UIControlEvents.TouchUpInside)
        gamesubView.addSubview(button)

    }

    func buttonA(sender:UIButton!) {
        println("loading next level \(nextLevelVar)")
        let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        var gameview = self.storyboard?.instantiateViewControllerWithIdentifier("gamevc") as GameViewController
        gameview.levelSelectedNum = String(nextLevelVar)

        self.presentViewController(gameview, animated: true, completion: nil)

    }
}