访问 UIButton 的子视图控件

Posted 2023-03-21

【中文标题】访问 UIButton 的子视图控件

【英文标题】：Access subview controls of a UIButton

【发布时间】：2015-03-05 13:24:29

【问题描述】：

我添加了一个 UILabel 作为 UIButton 的子视图

var actLabel = UILabel(frame: CGRectMake(35, 0, 90, favHeight)) actLabel.font = UIFont(name: "Helvetica", size: 14) actLabel.text = "Actions" actLabel.textColor = darkBlueColor actLabel.textAlignment = NSTextAlignment.Center actPanel.addSubview(actLabel) 其中actPanel 是一个UIButton

在此 UIButton 的操作上，我想访问此 UILabel 的控件。我该怎么做？

【参考方案1】：

子类 UIButton

class ActionButton : UIButton 
    var actionLabel: UILabel!


var actLabel = UILabel(frame: CGRectMake(35, 0, 90, favHeight))
actLabel.font = UIFont(name: "Helvetica", size: 14)
actLabel.text = "Actions"
actLabel.textColor = darkBlueColor
actLabel.textAlignment = NSTextAlignment.Center
actPanel.addSubview(actLabel)
actPanel.actionLabel = actLabel

或者将智慧融入课堂

class ActionButton : UIButton 
    var favoriteHeight: CGFloat = 80 // Or whatever default you want.
    var darkBlueColor: UIColor = UIColor(red: 0, green: 0, blue: 0.75, alpha: 1) // Or whatever

    @IBOutlet var actionLabel: UILabel! 
        get 
            if _actionLabel == nil 
                var actLabel = UILabel(frame: CGRectMake(35, 0, 90, favoriteHeight))
                actLabel.font = UIFont(name: "Helvetica", size: 14)
                actLabel.textColor = darkBlueColor
                actLabel.textAlignment = NSTextAlignment.Center
                addSubview(actLabel)

                _actionLabel = actLabel
            
            return _actionLabel
        
        set 
            _actionLabel?.removeFromSuperview()
            _actionLabel = newValue
            if let label = _actionLabel 
                addSubview(label)
            
        
    

    override func willMoveToSuperview(newSuperview: UIView?) 
        // Ensure actionLabel exists and the text has a value.
        if actionLabel.text == nil || actionLabel.text!.isEmpty 
            actionLabel.text = "Action" // Provide a default value
        
    

    private var _actionLabel: UILabel!

【参考方案2】：

您可以通过

访问所有子视图

var subviews = actPanel.subviews()

然后您可以遍历该数组并找到您的标签。

但是如果你有这个标签作为按钮的标题，那么 UIButton 已经有它自己的 titleLabel。

【参考方案3】：

如果您为 actPanel 创建了一个类并将标签添加为属性，您可以使用 actPanel.actLabel.text = "Actions" 访问它，否则您可以像以前一样访问它：actLabel.text = "Actions"