[Objective-C]ランダムな長さのランダムな文字列を作る

gistfile1.m

- (NSString *)randStringWithMaxLenght:(NSInteger)max {
    NSInteger length = [self randBetween:1 max:max];
    unichar letter[length];
    for (int i = 0; i < length; i++) {
        letter[i] = [self randBetween:65 max:90];
    }
    return [[NSString alloc] initWithCharacters:letter length:length];
}
- (NSInteger)randBetween:(NSInteger)min max:(NSInteger)max {
    return (random() % (max - min + 1)) + min;
}