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
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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
}
}
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3.创建放置验证码的label
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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)
}
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4.底部view是随便画几条细线
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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)
}
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5.调用方法及回调
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public func refreshCode(callBack: @escaping (_ str: NSString) -> ()) {
initCodeView()
callBack(codeStr)
}
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6.效果图
以上所述是小编给大家介绍的iOS 生成图片验证码(实用功能)，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://blog.csdn.net/three_zhang/article/details/60577916