iOS 生成图片验证码(实用功能)

1.数据源

codeArray = ["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]

2.随机生成验证码

									for index in 0..<4 {

									      let i = (Int)(arc4random()) % (codeArray.count-1)

									      let str = codeArray[i]

									      if index == 0 {

									        codeStr = str as NSString

									      }else {

									        codeStr = "\(codeStr)\(str)" as NSString

									      }

									    }

3.创建放置验证码的label

									for i in 0..<codeStr.length {

									      let pxx = arc4random() % UInt32(randWidth)

									      let px = CGFloat(pxx) + CGFloat(i)*(self.frame.size.width-3)/CGFloat(codeStr.length)

									      let py = arc4random() % UInt32(randHeight)

									      let label = UILabel.init(frame: CGRect.init(x: px + 3, y: CGFloat(py), width: textSize.width, height: textSize.height))

									      label.text = String.init(format: "%C", codeStr.character(at: i))

									      label.font = UIFont.systemFont(ofSize: 20)

									      if (isRotation == true) {

									        let a = arc4random() % UInt32(60)

									        let r = Double(a)-30

									        label.transform = CGAffineTransform.init(rotationAngle: CGFloat(r*M_PI)/180)

									      }

									      bgView.addSubview(label)

									    }

4.底部view是随便画几条细线

									for _ in 0...9 {

									      let path = UIBezierPath.init()

									      let pX = arc4random() % UInt32(self.frame.width)

									      let pY = arc4random() % UInt32(self.frame.height)

									      path.move(to: CGPoint.init(x: CGFloat(pX), y: CGFloat(pY)))

									      let ptX = arc4random() % UInt32(self.frame.width)

									      let ptY = arc4random() % UInt32(self.frame.height)

									      path.addLine(to: CGPoint.init(x: CGFloat(ptX), y: CGFloat(ptY)))

									      let layer = CAShapeLayer.init()

									      layer.strokeColor = UIColor.getRandomColor(withAlpha: 0.2).cgColor//layer的边框色

									      layer.lineWidth = 1.0

									      layer.strokeEnd = 1

									      layer.fillColor = UIColor.clear.cgColor

									      layer.path = path.cgPath

									      bgView.layer.addSublayer(layer)

									    }

5.调用方法及回调

									public func refreshCode(callBack: @escaping (_ str: NSString) -> ()) {

									    initCodeView()

									    callBack(codeStr)

									  }