自定義的UIView不顯示任何

Question

我創建了一個自定義的UIView：

import UIKit 

class IndicatorView: UIView { 

    var image_view_indicator: UIImageView! 
    var label_indicator: UILabel! 

    required init(coder decoder: NSCoder) { 
     super.init(coder: decoder)! 
    } 

    init(frame:CGRect, imageName: String, indicatorValue: String) 
    { 
     super.init(frame: frame) 
     self.frame = frame 
     image_view_indicator = UIImageView(frame: CGRect(x: 0, y: 0, width: 15, height: 15)) 
     image_view_indicator.image = UIImage(named: imageName) 
     self.addSubview(image_view_indicator) 
     self.bringSubviewToFront(image_view_indicator) 

     label_indicator = UILabel(frame: CGRect(x: image_view_indicator.frame.size.width + 3, y: 0, width: 25, height: 15)) 
     label_indicator.text = indicatorValue 
     label_indicator.textColor = UIColor.blackColor() 
     self.addSubview(label_indicator) 
     self.bringSubviewToFront(label_indicator) 
    } 

} 

這是我的電話從UIViewController：

view_indicator_friends = IndicatorView(frame: view_indicator_friends.frame, imageName: "friend.png", indicatorValue: "20") 

我交叉檢查IBOutlet連接。他們似乎很好。
但是在自定義視圖中沒有任何顯示。

Answer 1

當你從Xib自定義視圖通過IBOutlet連接，那麼您的自定義init不會調用的，爲什麼你image_view_indicator和label_indicator不創建。這就是爲什麼你的自定義視圖不能正確顯示。一種解決方案是在awakeFromNib方法中使用init(frame:CGRect, imageName: String, indicatorValue: String)方法實現您的代碼。

override func awakeFromNib() { 
     let frame = self.frame 
     image_view_indicator = UIImageView(frame: CGRect(x: 0, y: 0, width: 15, height: 15)) 
     image_view_indicator.image = UIImage(named: imageName) 
     self.addSubview(image_view_indicator) 
     self.bringSubviewToFront(image_view_indicator) 

     label_indicator = UILabel(frame: CGRect(x: image_view_indicator.frame.size.width + 3, y: 0, width: 25, height: 15)) 
     label_indicator.text = indicatorValue 
     label_indicator.textColor = UIColor.blackColor() 
     self.addSubview(label_indicator) 
     self.bringSubviewToFront(label_indicator) 

     }