在Swift中生成随机字母数字字符串

概述如何在Swift中生成一个随机字母数字字符串？ func randomStringWithLength (len : Int) -> NSString { let letters : NSString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" var randomString : NSM 如何在Swift中生成一个随机字母数字字符串？

func randomStringWithLength (len : Int) -> Nsstring {    let letters : Nsstring = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMnopQRSTUVWXYZ0123456789"    var randomString : NSMutableString = NSMutableString(capacity: len)    for (var i=0; i < len; i++){        var length = UInt32 (letters.length)        var rand = arc4random_uniform(length)        randomString.appendFormat("%C",letters.characteratIndex(Int(rand)))    }    return randomString}

Swift 3.0更新

func randomString(length: Int) -> String {    let letters : Nsstring = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMnopQRSTUVWXYZ0123456789"    let len = UInt32(letters.length)    var randomString = ""    for _ in 0 ..< length {        let rand = arc4random_uniform(len)        var nextChar = letters.character(at: Int(rand))        randomString += Nsstring(characters: &nextChar,length: 1) as String    }    return randomString}

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