oc输入8-16位数字和字符

#define kAlphaNum @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

// 判断长度大于8位后再接着判断是否同时包含数字和字符
+ (BOOL)hasNumAndLetter:(NSString *)string {
    
    BOOL result = false;
    if ([string length] >= 8 && [string length] <= 16){
        // 判断长度大于8位后再接着判断是否同时包含数字和字符
        NSString * regex = @"^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{8,16}$";
        NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
        result = [pred evaluateWithObject:string];
    }
    return result;
}

// 判断是否可以输入
+ (BOOL)canInputText:(NSString *)text string:(NSString *)string {
    NSCharacterSet *cs;
    cs = [[NSCharacterSet characterSetWithCharactersInString:kAlphaNum] invertedSet];
    NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""]; //按cs分离出数组,数组按@""分离出字符串
    BOOL canChange = [string isEqualToString:filtered];
    if(text.length <= 16) {
        return canChange;
    }
    return  NO;
}

使用：

1.限制只能输入数字和字符

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
  // 限制只能输入数字和字符
    if ([self.passworld isEqual:textField]) {
         return  [NSString canInputText:textField.text string:string];
    }
   return  YES;
}

2.必须输入数字+字母

    if (self.passworld.text.length<8 ||self.passworld.text.length >16) {
        [SVProgressHUD showErrorWithStatus:@"密码长度限制为8-16位"];
        return;
    }
    
    if (![NSString hasNumAndLetter:self.passworld.text]) {
        [SVProgressHUD showErrorWithStatus:@"请输入8-16位数字+字母组合"];
        return;
    }