iOS禁止输入表情符

近期开发中,发现如果输入文本中有表情上传服务器失败,因此整理一下禁止用户输入表情的方法,网上的帖子中不能禁止所有表情符,比如⚽️,🤵等,因此在此做了整理.

首先创建NSString的分类,在其中添加判断是否含有表情符的方法

//判断是否含有表情符号 yes-有 no-没有
+ (BOOL)stringContainsEmoji:(NSString *)string {
    __block BOOL returnValue =NO;
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
        const unichar hs = [substring characterAtIndex:0];
        if (0xd800) {
            if (0xd800 <= hs && hs <= 0xdbff) {
                if (substring.length > 1) {
                    const unichar ls = [substring characterAtIndex:1];
                    const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                    if (0x1d000 <= uc && uc <= 0x1f77f) {
                        returnValue =YES;
                    }
                }
            }else if (0x2100 <= hs && hs <= 0x27ff){
               returnValue =YES;
            }else if (0x2B05 <= hs && hs <= 0x2b07) {
                returnValue =YES;
            }else if (0x2934 <= hs && hs <= 0x2935) {
                returnValue =YES;
            }else if (0x3297 <= hs && hs <= 0x3299) {
                returnValue =YES;
            }else{
                if (substring.length > 1) {
                    const unichar ls = [substring characterAtIndex:1];
                    if (ls == 0x20e3) {
                        returnValue =YES;
                    }
                }
            }
            if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50 || hs == 0xd83e) {
                returnValue =YES;
            }
            
      }
    }];
    return returnValue;
}
//是否是系统自带九宫格输入 yes-是 no-不是
+ (BOOL)isNineKeyBoard:(NSString *)string {
    NSString *other = @"➋➌➍➎➏➐➑➒";
    int len = (int)string.length;
    for(int i=0;i<len;i++){
       if(!([other rangeOfString:string].location != NSNotFound))
          return NO;
    }
    return YES;
}
//判断第三方键盘中的表情
+ (BOOL)hasEmoji:(NSString*)string {
    NSString *pattern = @"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]";
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
    BOOL isMatch = [pred evaluateWithObject:string];
    return isMatch;
}
//去除表情
+ (NSString *)disableEmoji:(NSString *)text {
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]"options:NSRegularExpressionCaseInsensitive error:nil];
    NSString *modifiedString = [regex stringByReplacingMatchesInString:text options:0 range:NSMakeRange(0, [text length]) withTemplate:@""];
    return modifiedString;
}

1.使用的时候在textFiled的代理方法中判断当前是否是表情键盘,如果当前显示的是表情键盘的话禁止输入

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    if ([[textField.textInputMode primaryLanguage] isEqualToString:@"emoji"] || ![textField.textInputMode primaryLanguage]) {
        return NO;
    }
    return YES;
}

2.创建监听键盘改变的方法,在此方法中过滤表情

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textFieldDidChanged:) name:@"UITextFieldTextDidChangeNotification" object:_inputView.inputTextField];

- (void)textFieldDidChanged:(NSNotification *)obj {
   //过滤表情符
    if ([NSString stringContainsEmoji:toBeString] || [NSString hasEmoji:toBeString]) {
        textFiled.text = [NSString disableEmoji:toBeString];
    }
}

-(void)dealloc{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UITextFieldTextDidChangeNotification" object:_inputView.inputTextField];
}

当然了你也可以对将要进行传输的数据编码,然后接受服务器数据再反编码展示.