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本文為您介紹自學 IOS的相關介紹，具體代碼請看下文

最近公司項目不是很忙，偶然間看到編程語言排行榜，看到swift 已經排到前10了，然OC排名也越來越後了，感覺要上車了，雖然現在項目都是用OC寫的，但是swift是一種趨勢。在網上看到“自學 IOS - 三十天三十個 Swift 項目” 這篇博客，我也想自己在閒暇之余學習下swift，在看了2天的swift 的語法過後，才開始做這個，語法看的也不是很懂，有些部分。還是要自己動手

廢話不多說

先上效果

import UIKit import SnapKit let SCREEN_WIDTH = UIScreen.main.bounds.size.width let SCREEN_HEIGHT = UIScreen.main.bounds.size.height var RGBColor: (CGFloat, CGFloat, CGFloat) -> UIColor = {red, green, blue in return UIColor(red: red / 255, green: green / 255, blue: blue / 255, alpha: 1); } var RGBAColor: (CGFloat, CGFloat, CGFloat, CGFloat) -> UIColor = {red, green, blue, alpha in return UIColor(red: red / 255, green: green / 255, blue: blue / 255, alpha: alpha); }

然後主控制器裡面的代碼（由於代碼比較簡單 我就沒寫注釋了 ）

import UIKit

class ViewController: UIViewController {

    lazy var topBox = UIView()
    lazy var bottomLeft = UIView()
    lazy var bottomRight = UIView()
    lazy var resertBtn = UIButton()
    lazy var startBtn = UIButton()
    lazy var pauseBtn = UIButton()
    lazy var numberLabel = UILabel()
    var timer: Timer!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.addSubview(topBox)
        self.view.addSubview(bottomLeft)
        self.view.addSubview(bottomRight)
        
        topBox.backgroundColor = RGBColor(8, 1, 34)
        bottomLeft.backgroundColor = RGBColor(82, 91, 252)
        bottomRight.backgroundColor = RGBColor(102, 189, 9)
        
        topBox.snp.makeConstraints { (make) in
            make.width.equalTo(SCREEN_WIDTH)
            make.height.equalTo(SCREEN_HEIGHT * 0.4)
            make.left.equalTo(self.view).offset(0)
            make.top.equalTo(self.view).offset(0)
        }
        
        resertBtn.setTitle("Reset", for: UIControlState.normal)
        resertBtn.setTitleColor(RGBColor(255, 255, 255), for: UIControlState.normal)
//        resertBtn.backgroundColor = UIColor.red
        resertBtn.addTarget(self, action: #selector(resert) , for: UIControlEvents.touchUpInside)
        self.topBox.addSubview(resertBtn)
        
        numberLabel.text = "0.0"
        numberLabel.font = UIFont.boldSystemFont(ofSize: 100)
        numberLabel.textColor = UIColor.white
        numberLabel.textAlignment = .center
        topBox.addSubview(numberLabel)
    
        numberLabel.snp.makeConstraints { (make) in
            make.center.equalTo(topBox)
            make.width.equalTo(topBox)
            make.height.equalTo(100)
        }
        
        resertBtn.snp.makeConstraints { (make) in
            make.width.equalTo(120)
            make.top.equalTo(self.topBox).offset(20)
            make.height.equalTo(20)
            make.right.equalTo(self.topBox.snp.right).offset(-20)
        }
        
        bottomLeft.snp.makeConstraints { (make) in
            make.width.equalTo(SCREEN_WIDTH * 0.5)
            make.top.equalTo(topBox.snp.bottom).offset(0)
            make.left.equalTo(self.view)
            make.bottom.equalTo(self.view)
        }
        
        startBtn.setTitle("開始", for: .normal)
        startBtn.setTitleColor(UIColor.white, for: .normal)
        startBtn.addTarget(self, action: #selector(start), for: .touchUpInside)
        bottomLeft.addSubview(startBtn)
        
        startBtn.snp.makeConstraints { (make) in
            make.width.equalTo(bottomLeft)
            make.height.equalTo(bottomLeft)
            make.left.equalTo(bottomLeft).offset(0)
            make.top.equalTo(bottomLeft).offset(0)
        }
        
        bottomRight.snp.makeConstraints { (make) in
            make.left.equalTo(bottomLeft.snp.right).offset(0)
            make.width.equalTo(bottomLeft)
            make.height.equalTo(bottomLeft)
            make.top.equalTo(topBox.snp.bottom).offset(0)
        }
        
        pauseBtn.setTitle("停止", for: .normal)
        pauseBtn.setTitleColor(UIColor.white, for: .normal)
        pauseBtn.addTarget(self, action: #selector(pause), for: .touchUpInside)
        bottomRight.addSubview(pauseBtn)
        
        pauseBtn.snp.makeConstraints { (make) in
            make.width.equalTo(bottomRight)
            make.height.equalTo(bottomRight)
            make.left.equalTo(bottomRight).offset(0)
            make.top.equalTo(bottomRight).offset(0)
        }
        
        
        
    }
    // MARK:清零的點擊事件
    func resert() {
        startBtn.isUserInteractionEnabled = true
        pauseBtn.isUserInteractionEnabled = true
        numberLabel.text = "0.0"
        timer.invalidate()

    }
    
    // MARK:開始事件
    func start(){
        startBtn.isUserInteractionEnabled = false
        pauseBtn.isUserInteractionEnabled = true

        // 創建並啟動定時器
        timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(numberChange), userInfo: self, repeats: true)
        timer.fire()
    }
    
    func numberChange() {
        let number = NSString(string: numberLabel.text!).doubleValue
        let changeNumber = number + 0.1
        numberLabel.text = "\(changeNumber)"
    }
    
    // MARK:暫停
    func pause() {
        pauseBtn.isUserInteractionEnabled = false
        startBtn.isUserInteractionEnabled = true
        timer.invalidate()
    }
    
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

}

謝謝您的訪問.

[db:作者簡介][db:原文翻譯及解析]

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