Swift

在iOS开发中，如果创建一个自定义的组件通常可以通过继承UIView来实现。下面以一个记分牌组件为例，演示了组件的创建和使用，以及枚举、协议等相关知识的学习。

效果图如下：

  

组件代码：ScoreView.swift

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

import UIKit   enum ScoreType{     case Common  //普通分数面板     case Best    //最高分面板 }   protocol ScoreViewProtocol{           func changeScore(value s:Int) }   class ScoreView:UIView, ScoreViewProtocol {     var label:UILabel!           let defaultFrame = CGRectMake(0,0,100,30)     var stype:String!  //显示”最高分“还是”分数“     var score:Int = 0{         didSet{             //分数变化，标签内容也要变化             label.text = "(stype):(score)"         }     }           //传入分数面板的类型，用于控制标签的显示     init(stype:ScoreType)     {         label = UILabel(frame:defaultFrame)         label.textAlignment = NSTextAlignment.Center                   super.init(frame:defaultFrame)                   self.stype = (stype == ScoreType.Common ? "分数":"最高分")                   backgroundColor = UIColor.orangeColor()         label.font = UIFont(name:"微软雅黑", size:16)         label.textColor = UIColor.whiteColor()         self.addSubview(label)     }           required init(coder aDecoder: NSCoder) {         super.init(coder: aDecoder)     }           //实现协议中的方法     func changeScore(value s:Int)     {         score = s     } }

组件使用：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

import UIKit   class ViewController: UIViewController {           var score:ScoreView!     var bestscore:ScoreView!           override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view, typically from a nib.         setupScoreLabels();     }           func setupScoreLabels()     {         score = ScoreView(stype: ScoreType.Common)         score.frame.origin = CGPointMake(50, 80)         score.changeScore(value: 0)         self.view.addSubview(score)                             bestscore = ScoreView(stype: ScoreType.Best)         bestscore.frame.origin.x = 170         bestscore.frame.origin.y = 80         bestscore.changeScore(value: 99)         self.view.addSubview(bestscore)               }           override func didReceiveMemoryWarning() {         super.didReceiveMemoryWarning()         // Dispose of any resources that can be recreated.     } }