由于項目需要設計一個隨機驗證碼顯示器,固自己寫了一個小demo,進行應用,特收集起來,以供使用
CodeCaptcha.gif
代碼如下
//
// RandomCaptchaView.swift
// RandomCaptchaView
import UIKit
class RandomCaptchaView: UIView {
var changeString:String? //驗證碼的字符串
private let kLineCount = 6
private let kLineWidth = CGFloat(2.0)
private let kCharCount = 4
private let kFontSize = UIFont(name: "Georgia-BoldItalic", size: CGFloat(arc4random() % 5) + 25 )
override init(frame: CGRect)
{
super.init(frame: frame)
let randomColor:UIColor = UIColor(red: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), green: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), alpha: 0.5)
self.layer.cornerRadius = 5.0 //設置layer圓角半徑
self.layer.masksToBounds = true //隱藏邊界
self.backgroundColor = randomColor
self.getChangeCode()
}
required init(coder aDecoder: NSCoder)
{
super.init(coder: aDecoder)!
self.getChangeCode()
}
private func getChangeCode()
{
//字符素材數組
let changeArray:NSArray = ["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"]
self.changeString = ""
//隨機從數組中選取需要個數的字符,然后拼接為一個字符串
for _ in 0 ..< kCharCount {
let index = Int(arc4random())%(changeArray.count - 1)
let getStr = changeArray.object(at: index)
self.changeString = self.changeString! + (getStr as! String)
}
print("驗證碼:\(changeString!)")
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesBegan(touches, with: event)
getChangeCode()
setNeedsDisplay()
}
override func draw(_ rect: CGRect) {
super.draw(rect)
//背景顏色
let randomBackColor = UIColor(red: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), green: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), alpha: 1.0)
self.backgroundColor = randomBackColor
//獲得要顯示驗證碼字符串,根據長度,計算每個字符顯示的大概位置
let str = NSString(string: "S")
// let font = UIFont.systemFontOfSize(20)
let size = str.size(attributes: [NSFontAttributeName : kFontSize!])
let width = rect.size.width / CGFloat(NSString(string: changeString!).length) - size.width
let height = rect.size.height - size.height
var point:CGPoint?
var pX:CGFloat?
var pY:CGFloat?
//文字顏色
let randomTextColor = UIColor(red: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), green: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), alpha: 1.0)
for i in 0..<NSString(string: changeString!).length {
pX = CGFloat(arc4random()).truncatingRemainder(dividingBy: width) + rect.size.width / CGFloat(NSString(string: changeString!).length)*CGFloat(i)
pY = CGFloat(arc4random()).truncatingRemainder(dividingBy: height)
point = CGPoint(x: pX!, y: pY!)
let c = NSString(string: changeString!).character(at: i)
let codeText:NSString? = NSString(format: "%C",c)
//設置繪制的文字的字體和顏色
codeText?.draw(at: point!, withAttributes: [NSFontAttributeName : kFontSize!, NSForegroundColorAttributeName:randomTextColor])
}
//調用drawRect:之前,系統會向棧中壓入一個CGContextRef,調用UIGraphicsGetCurrentContext()會取棧頂的CGContextRef
let context: CGContext = UIGraphicsGetCurrentContext()!
//設置畫線寬度
context.setLineWidth(kLineWidth)
for _ in 0..<kLineCount {
//繪制干擾的彩色直線
let randomLineColor = UIColor(red: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), green: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), blue: CGFloat(CGFloat(arc4random())/CGFloat(RAND_MAX)), alpha: 0.5)
context.setStrokeColor(randomLineColor.cgColor)
//設置線的起點
pX = CGFloat(arc4random()).truncatingRemainder(dividingBy: rect.size.width)
pY = CGFloat(arc4random()).truncatingRemainder(dividingBy: rect.size.height)
context.move(to: CGPoint(x: pX!, y: pY!))
//設置線終點
pX = CGFloat(arc4random()).truncatingRemainder(dividingBy: rect.size.width)
pY = CGFloat(arc4random()).truncatingRemainder(dividingBy: rect.size.height)
context.addLine(to: CGPoint(x: pX!, y: pY!))
context.strokePath()
}
}
}
使用方法
swift 隨機驗證碼
let text1 = textField.text
let text2 = randomCaptchaView.changeString
//caseInsensitive 不區分大小寫
let result = text1?.range(of: text2!, options: .caseInsensitive)
if result == nil {
let alert = UIAlertView(title: nil, message: "驗證碼錯誤", delegate: self, cancelButtonTitle: "確定")
alert.show()
} else {
let alert = UIAlertView(title: nil, message: "驗證碼正確", delegate: self, cancelButtonTitle: "確定")
alert.show()
}