Objective-C版
// 随机生成字符串(由大小写字母、数字组成)
+ (NSString *)random: (int)len {
char ch[len];
for (int index=0; index<len; index++) {
int num = arc4random_uniform(75)+48;
if (num>57 && num<65) { num = num%57+48; }
else if (num>90 && num<97) { num = num%90+65; }
ch[index] = num;
}
return [[NSString alloc] initWithBytes:ch length:len encoding:NSUTF8StringEncoding];
}
// 随机生成字符串(由大小写字母组成)
+ (NSString *)randomNoNumber: (int)len {
char ch[len];
for (int index=0; index<len; index++) {
int num = arc4random_uniform(58)+65;
if (num>90 && num<97) { num = num%90+65; }
ch[index] = num;
}
return [[NSString alloc] initWithBytes:ch length:len encoding:NSUTF8StringEncoding];
}
Swift版
extension String {
/// 生成随机字符串
///
/// - Parameters:
/// - count: 生成字符串长度
/// - isLetter: false=大小写字母和数字组成,true=大小写字母组成,默认为false
/// - Returns: String
static func random(_ count: Int, _ isLetter: Bool = false) -> String {
var ch: [CChar] = Array(repeating: 0, count: count)
for index in 0..<count {
var num = isLetter ? arc4random_uniform(58)+65:arc4random_uniform(75)+48
if num>57 && num<65 && isLetter==false { num = num%57+48 }
else if num>90 && num<97 { num = num%90+65 }
ch[index] = CChar(num)
}
return String(cString: ch)
}
}
使用
/// 大小写字母和数字组成
let string1 = String.random(100)
/// 大小写字母组成
let string2 = String.random(100, true)
还不快抢沙发