iOS限制textField只能输入中文，数字跟字母

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    if (textField == self.nameTextField) {
        if ([self isInputRuleNotBlank:string] || [string isEqualToString:@""]) {//当输入符合规则和退格键时允许改变输入框
            return YES;
        } else {
            return NO;
        }
    }
    return YES;
}

/**
 * 字母、数字、中文正则判断（不包括空格）
 */
- (BOOL)isInputRuleNotBlank:(NSString *)str {
   
    NSString *pattern = @"^[➋➌➍➎➏➐➑➒a-zA-Z\u4E00-\u9FA5\\d]*$";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
    BOOL isMatch = [pred evaluateWithObject:str];
    return isMatch;
}