/// 随机字符串生成
class RandomString {
let characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
/**
生成随机字符串,
- parameter length: 生成的字符串的长度
- returns: 随机生成的字符串
*/
func getRandomStringOfLength(length: Int) -> String {
var ranStr = ""
for _ in 0..<length {
let index = Int(arc4random_uniform(UInt32(characters.characters.count)))
ranStr.append(characters[characters.startIndex.advancedBy(index)])
}
return ranStr
}
private init() {
}
static let sharedInstance = RandomString()
}
用法
RandomString.sharedInstance.getRandomStringOfLength(10)
