password generator

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###CODE

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// Playground - noun: a place where people can play

import UIKit

//Step 1.
var pwCharacters =     ["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","1","2","3","4","5","6","7","8","9","0","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","!","@","#","$","%","^","&","*"]

//Step 2.
func randomPassword(passwordLength: Int) -> String {

    var password = ""
    var unsignedArrayCount = UInt32(pwCharacters.count)

    for var i = 0; i < passwordLength; i++ {
        var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount)
        var randomNumber = Int(unsignedRandomNumber)
        password += pwCharacters[randomNumber]
    }
    return password
}

//Step 3
//任意生成1000位密码
randomPassword(1000)

//任意生成15密码
var password = "\(randomPassword(5))-\(randomPassword(5))-\(randomPassword(5))"

###References
One Thousand Character Password