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
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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：
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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.
}
} |