iOS 检测字符串中是否含有数字、特殊符号

- (BOOL)containsDigit{
    for (int i = 0; i < self.length; i++) {
        unichar c = [self characterAtIndex:i];
        if((c > 47)&&(c < 58)) {
            return YES;
        }
    }
    return NO;
}

- (BOOL)containsSpecialCharacter{
    NSString *specialCharacters = @"~`!@#$%^&*()_+-=[]|{};':\",.<>?/";//规定的特殊字符，可以自己随意添加
    for (int i = 0; i < self.length; i++) {
        NSString *subStr = [self substringWithRange:NSMakeRange(i, 1)];
        if([specialCharacters containsString:subStr]) {
            return YES;
        }
    }
    return NO;
}