OC
//隨機(jī)字母
- (NSString *)randomStringWithNumber:(NSInteger)number{ //number 是需要的個(gè)數(shù)
NSString *ramdom;
NSMutableArray *array = [NSMutableArray array];
for (int i = 1; i ; i ++) {
int a = (arc4random() % 122); //如需要可以改變數(shù)值大小 這兒的數(shù)值是ASCII值
if (a > 96) { //這兒是小寫(xiě)字母 如需要自行更改
char c = (char)a;
[array addObject:[NSString stringWithFormat:@"%c",c]];
if (array.count == number) {
break;
}
} else continue;
}
ramdom = [array componentsJoinedByString:@""];//這個(gè)是把數(shù)組轉(zhuǎn)換為字符串
return ramdom;
}
swift
/** 隨機(jī)產(chǎn)生字符串
parameters:
- number 字符串長(zhǎng)度
- digital 是否包含數(shù)字
- capital 是否包含大寫(xiě)
- lowercase 是否包含小寫(xiě)
*/
class func getRandomString(_ number:Int! ,_ digital:Bool!,_ capital:Bool!,_ lowercase:Bool!) -> String{
var number:Int! = number
if number < 1 {
number = 32
}
var strArray:Array<String> = Array()
for _ in 0...INT64_MAX {
let a:Int = Int(arc4random() % 122)
let c:Character = Character(UnicodeScalar(a)!)
//包含數(shù)字
if digital {
if a > 47 && a < 58{
strArray.append(String.init(c))
}
}
//大寫(xiě)字母
if capital {
if a > 64 && a < 92 {
strArray.append(String.init(c))
}
}
//小寫(xiě)字母
if lowercase {
if a > 96 && a < 123 {
strArray.append(String.init(c))
}
}
if strArray.count == number{
break
}
}
let str:String = strArray.joined(separator: "")
return str;
}
自己照?qǐng)D更改數(shù)值（有些我不確定能行哦！）
ASCII表.png
