awakeFromNib 中的变量为零

Posted 2023-02-26

【中文标题】awakeFromNib 中的变量为零

【英文标题】：Variables is nil in awakeFromNib

【发布时间】：2016-11-09 11:54:46

【问题描述】：

我创建了一个自定义 UIView，并使用对象 ConnectDetailItem 进行实例化。

我的自定义视图代码：

class InfosConnectView: UIView 

    var view: UIView!

    @IBOutlet weak var categorie: UILabel!
    @IBOutlet weak var distance: UILabel!
    @IBOutlet weak var followers: UILabel!
    @IBOutlet weak var descriptionTextView: UITextView!

    var connectDetailsItem:ConnectDetailsItem!

    convenience init(connectDetailsItem:ConnectDetailsItem, frame:CGRect) 
        self.init(frame: frame)
        self.connectDetailsItem = connectDetailsItem
        xibSetup()
    

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

    required init(coder aDecoder: NSCoder) 
        super.init(coder: aDecoder)!
    

    func xibSetup() 
        view = loadViewFromNib()

        // use bounds not frame or it'll be offset
        view.frame = bounds

        // Make the view stretch with containing view
        view.autoresizingMask = [UIViewAutoresizing.flexibleWidth, UIViewAutoresizing.flexibleHeight]

        view.layer.borderWidth = 1
        view.layer.borderColor = UIColor(hex: "#DDDDDD").cgColor

        // Adding custom subview on top of our view (over any custom drawing > see note below)
        addSubview(view)
    

    func loadViewFromNib() -> UIView 

        let bundle = Bundle(for: type(of: self))
        let nib = UINib(nibName: "viewInfosConnect", bundle: bundle)
        let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView

        return view
    

    override func awakeFromNib() 
        super.awakeFromNib()

        //Infos Connect
        self.categorie.text = "\(self.connectDetailsItem.category)"
        self.categorie.text = "\(self.connectDetailsItem.category)"
        if (self.connectDetailsItem.distance < 1000) 
            self.distance.text = "\(self.connectDetailsItem.distance) m"
         else 
            let distance:NSString = NSString(format: "%.01f", Float(self.connectDetailsItem.distance)/1000)
            self.distance.text = "\(distance) km"
        
        if(self.connectDetailsItem.followCount < 2) 
            if(self.connectDetailsItem.followCount < 1) 
                self.followers.text = "0 abonné"
             else 
                self.followers.text = "\(self.connectDetailsItem.followCount) abonné"
            
         else 
            self.followers.text = "\(self.connectDetailsItem.followCount) abonnés"
        
        self.descriptionTextView.text = self.connectDetailsItem.description
    

在awakeFromNib() 中，connectDetailItem 是nil。为什么？

我的观点是这样的：let viewInfos = InfosConnectView(connectDetailsItem: self.connectDetailsItem, frame: CGRect(x: 0, y: 9, width: self.view.frame.width, height: 200))

我设置了断点并且在进入awakeFromNib函数之前connectDetailItem不是nil。

【问题讨论】：

查看查看地址。也许是不同的视图示例？

如果我注释掉 awakeFromNib() 中的所有行，视图显示正确。

您说问题不在于“正确”显示。无论如何，“connectDetailsItem”为零。请检查内存中的查看地址。您可以在调试器中执行此操作。它看起来像：“0x12345678”

尝试将您的所有代码从您的awakeFromNib 中放入一个函数中。并从init 和awakeFromNib 调用该函数。

Rikh 这个函数在哪里调用？

【参考方案1】：

我找到了解决方案。 我将代码放在函数 loadViewFromNib 中，如下所示：

func loadViewFromNib() -> InfosConnectView 

        let bundle = Bundle(for: type(of: self))
        let nib = UINib(nibName: "viewInfosConnect", bundle: bundle)
        let view = nib.instantiate(withOwner: self, options: nil)[0] as! InfosConnectView

        //Infos Connect
        view.categorie.text = "\(self.connectDetailsItem.category)"
        if (self.connectDetailsItem.distance < 1000) 
            view.distance.text = "\(self.connectDetailsItem.distance) m"
         else 
            let distance:NSString = NSString(format: "%.01f", Float(self.connectDetailsItem.distance)/1000)
            view.distance.text = "\(distance) km"
        
        if(self.connectDetailsItem.followCount < 2) 
            if(self.connectDetailsItem.followCount < 1) 
                view.followers.text = "0 abonné"
             else 
                view.followers.text = "\(self.connectDetailsItem.followCount) abonné"
            
         else 
            view.followers.text = "\(self.connectDetailsItem.followCount) abonnés"
        
        view.descriptionTextView.text = self.connectDetailsItem.description

        return view