Question

所以我已经看到并根据我在stackoverflow上看到的内容对我的代码进行了各种无数的更改，但实际上似乎没有任何效果。当我按下将写入用户默认数据的音量按钮时发生错误，因此我可以在实际游戏过程中检查音频即将播放。

我认为这只是我的问题，因为我已经尝试了一切。无论如何，我的代码如下：

//if user presses volume button
@IBAction func DaVol(_ sender: Any)
{
    //if User default for audio is nil, initialize it, otherwise change it where needed
    if audioDefaultIsMuted.value(forKey: "Volume") != nil
    {
        //if the audio has been on turn it off
        let tempAudioDefaultIsMuted = audioDefaultIsMuted.value(forKey: "Volume") as! Bool
        if  tempAudioDefaultIsMuted == false
        {
            //if label is the on music one, set value to true (meaning ismuted will be true)
            //then change label to off label
            audioDefaultIsMuted.set(true, forKey: "Volume")
            audioDefaultIsMuted.synchronize()

            //change to new image
            volumectrl.setImage(#imageLiteral(resourceName: "nowaves"), for: UIControlState.normal)
        }
        else
        {
            //otherwise set value to false
            //then change label to on one
            audioDefaultIsMuted.set(true, forKey: "Volume")
            audioDefaultIsMuted.synchronize()

            //change to new image
            volumectrl.setImage(#imageLiteral(resourceName: "audio"), for: UIControlState.normal)
        }
    }
    let currVolImage = volumectrl.image(for: UIControlState.normal)
    //check curr image and do same shit as before accordingly
    if  currVolImage == #imageLiteral(resourceName: "audio")
    {
        //if label is the on music one, set value to true (meaning ismuted will be true)
        //then change label to off label
        audioDefaultIsMuted.set(true, forKey: "Volume")
        audioDefaultIsMuted.synchronize()

        volumectrl.setImage(#imageLiteral(resourceName: "nowaves"), for: UIControlState.normal)
    }
    else if currVolImage == #imageLiteral(resourceName: "nowaves")
    {
        //otherwise set value to false
        //then change label to on one
        audioDefaultIsMuted.set(false, forKey: "Volume")
        audioDefaultIsMuted.synchronize()

        volumectrl.setImage(#imageLiteral(resourceName: "audio"), for: UIControlState.normal)
    }
}

Answer 1

您从哪里获得audioDefaultIsMuted，并检查其值。

你可以使用swift let if来简化你的代码

if let value = audioDefaultIsMuted.value(forKey: "Volume") {
  print(value)
}

Answer 2

可能是您已将按钮操作连接到方法，之后您更改了方法名称或删除了方法并编写并连接了新方法。

这样做 -

右键单击故事板中的按钮（如果使用）并删除其上的所有操作
通过从按钮拖动到相应的按钮再次连接按钮操作行动方法

无法识别的选择器发送到实例0x7fe098c09830

2 个答案: