30天30swift项目挑战

笔者最近在学习swift，已经很迅速地把从零开始学Swift看了一遍，然后心想找点小项目来一面写一面加固Swift的基础，偶然间在github上看到#100 Days of Swift然后也想这样来充实一下自己。虽然把语法什么的都过了一遍，但是还是到了实战上面又会不一样，所以我就打算也开始每天写1～2个小项目来充实自己

项目挑战一：Stop Watch 计时器

项目展示

计时器

一、首先创建新项目

我们进行开发是使用xcode的

新建项目

我门使用swift语言进行开发

选择Swift

完成后得到目录

目录

二、打开Main.storyboard

分别设置背景颜色，新增label和3个按钮

Main.storyboard界面

三、创建SWViewController.swift

选择Cocoa Touch Class 然后点击next

新建SWViewController

然后Subclass选择UIViewController

选择UIViewController

四、代码部分

//
//  SWViewController.swift
//  Project01-StopWatch
//
//  Created by space on 2018/4/20.
//  Copyright © 2018年 space. All rights reserved.
//

import UIKit
import Foundation

class SWViewController: UIViewController {
    

    @IBOutlet weak var timeLabel: UILabel!
    @IBOutlet weak var playBtn : UIButton!
    @IBOutlet weak var pauseBtn : UIButton!
    
    var counter = 0.0
    var timer = Timer()
    var isPlaying = false
    
    
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return UIStatusBarStyle.lightContent
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        timeLabel.text = String(counter)
        super.viewDidLoad()
        

        // Do any additional setup after loading the view.
    }

   
    
    
    /// 开始按钮
    ///
    /// - Parameter sender: <#sender description#>
    @IBAction func playButtonDidTouch(sender: AnyObject) {
        if isPlaying {
            return
        }
        playBtn.isEnabled = false
        pauseBtn.isEnabled = true
        timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(SWViewController.updateTimer), userInfo: nil, repeats: true)
        isPlaying = true
        
    }
    
    
    /// 暂停按钮
    ///
    /// - Parameter sender: <#sender description#>
    @IBAction func pauseButtonDidTouch(sender: AnyObject) {
        
        playBtn.isEnabled = true
        pauseBtn.isEnabled = false
        timer.invalidate()
        isPlaying = false
        
    }
    
    /// 重置按钮
    ///
    /// - Parameter sender:
    @IBAction func resetButtonDidTouch(sender: AnyObject){
        timer.invalidate()
        isPlaying = false
        counter = 0.0
        timeLabel.text = String(counter)
        playBtn.isEnabled = true
        pauseBtn.isEnabled = false
    }
    
    

    
    /// 更新timer
    @objc func updateTimer(){
        counter = counter + 0.1
        timeLabel.text = String(format: "%.1f", counter)
    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

五、返回Main.storyboard

选择左边的View Controller Scene下的View Controller，右边Custom Class选择SWViewController (刚刚自己写的类)

选择刚刚写的Class

选择这个

选择最右边的小图片进行关联

如图所示，将相关的按钮和outlets连接起来

连接起来

reset to Suggested Constraints

最后就能运行程序了！！！！！