Swift基础之音乐播放随机变换着色板

今天的内容比较简单，我也就不做详细的文字介绍了，直接上代码，希望对大家有所帮助

var audioPlayer = AVAudioPlayer()
    //梯度配色
    let gradientLayer = CAGradientLayer()
    var timer:Timer?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        let redValue = CGFloat(drand48())
        let blueValue =  CGFloat(drand48())
        let greenValue = CGFloat(drand48())
        
        self.view.backgroundColor = UIColor(red: redValue, green: greenValue, blue: blueValue, alpha: 1.0)
        
        //graditent color，梯度颜色
        gradientLayer.frame = view.bounds
        let color1 = UIColor(white: 0.5, alpha: 0.2).cgColor
        let color2 = UIColor(red: 1.0, green: 0, blue: 0, alpha: 0.4).cgColor
        let color3 = UIColor(red: 0, green: 1, blue: 0, alpha: 0.3).cgColor
        let color4 = UIColor(red: 0, green: 0, blue: 1, alpha: 0.3).cgColor
        let color5 = UIColor(white: 0.4, alpha: 0.2).cgColor
        
        gradientLayer.colors = [color1, color2, color3, color4, color5]
        gradientLayer.locations = [0.10, 0.30, 0.50, 0.70, 0.90]
        gradientLayer.startPoint = CGPoint.init(x: 0, y: 0)
        gradientLayer.endPoint = CGPoint.init(x: 1, y: 1)
        self.view.layer.addSublayer(gradientLayer)
        
        let playBtn = UIButton.init(frame: CGRect.init(x: (UIScreen.main.bounds.size.width-100)/2, y: (UIScreen.main.bounds.size.height-100)/2, width: 100, height: 100))
        playBtn.setBackgroundImage(UIImage.init(named: "music play"), for: .normal)
        playBtn.layer.cornerRadius = 50
        playBtn.layer.borderWidth = 1
        playBtn.layer.borderColor = UIColor.lightGray.cgColor
        playBtn.addTarget(self, action: #selector(playBtnClick), for: .touchUpInside)
        self.view.addSubview(playBtn)
        
    }
    //MARK:-------按钮点击
    func playBtnClick(btn:UIButton)  {
        //play bg music
        let bgMusic = NSURL(fileURLWithPath: Bundle.main.path(forResource: "Ecstasy", ofType: "mp3")!)
        
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
            try AVAudioSession.sharedInstance().setActive(true)
            try audioPlayer = AVAudioPlayer(contentsOf: bgMusic as URL)
            audioPlayer.prepareToPlay()
            audioPlayer.play()
        }
        catch let audioError as NSError {
            print(audioError)
        }
        
        if (timer == nil) {
            timer = Timer.scheduledTimer(timeInterval: 0.2, target: self, selector: #selector(ViewController.randomColor), userInfo: nil, repeats: true)
        }
    }
    //定时器方法
    func randomColor() {
        let redValue = CGFloat(drand48())
        let blueValue =  CGFloat(drand48())
        let greenValue = CGFloat(drand48())
        
        self.view.backgroundColor = UIColor(red: redValue, green: greenValue, blue: blueValue, alpha: 1.0)
    }

效果图：（源码下载：https://github.com/hbblzjy/SwiftRandomColorizationDemo）