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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