29,028
社区成员
发帖
与我相关
我的任务
分享
+(NSString *)retbitStringWithLength:(int)length{
NSMutableString *randomStr = [[NSMutableString alloc]initWithCapacity:length];
for (int i = 0; i<length; i++) {
BOOL isNumOrChar = arc4random() % 2;
if (isNumOrChar) {
[randomStr appendString: [NSString stringWithFormat:@"%c",(char)('A' + (arc4random_uniform(26)))] ] ;
}else{
[randomStr appendString: [NSString stringWithFormat:@"%d",arc4random() % 10]];
}
}
return randomStr;
}
调用
[YourClass retbitStringWithLength:24];