/**
生成随机字母
@param number 需要的个数
@return 生成的字符串
*/
+ (NSString *)randomString:(NSInteger)number;
+ (NSString *)randomString:(NSInteger)number {
NSString *ramdom;
NSMutableArray *array = [NSMutableArray array];
for (int i = 1; i ; i ++) {
int a = (arc4random() % 122);
if (a > 96) {
char c = (char)a;
[array addObject:[NSString stringWithFormat:@"%c",c]];
if (array.count == number) {
break;
}
} else continue;
}
ramdom = [array componentsJoinedByString:@""];
return ramdom;
}
