关于demo3.0表情，文字混合输入问题

在上一个2.0版本中，我有一天脑洞大开，突然想试试，聊天的输入内容是如何删除的。于是我输入了一些文字，发现删除时确实是一个一个删除的，接着测试，我在输入文字的同时，输入了表情，demo自带的表情。然后删除，发现也没问题。那么继续，我在输入文字时，夹杂了系统中得emoji表情。然后，哈哈哈，程序跪了。查看代码后，发现一个emoji表情占两个字符，而是不是emoji表情居然是通过是否包含在_defaultEmoji进行的判断，而_defaultEmoji只包含demo自己的30多个表情，果然demo就是demo，参考一下就好。造成奔溃的原因就是我们输入了不属于_defaultEmoji的表情，在进行删除时，没有按两个字符进行删除。

#pragma mark - DXFaceDelegate


- (void)selectedFacialView:(NSString *)str isDelete:(BOOL)isDelete

{

    NSString *chatText = self.inputTextView.text;


    NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithAttributedString:self.inputTextView.attributedText];


    if (!isDelete && str.length > 0) {

        NSRange range = [self.inputTextView selectedRange];
[attr insertAttributedString:[EaseEmotionEscape attStringFromTextForInputView:str] atIndex:range.location];

        self.inputTextView.text = @"";

        self.inputTextView.attributedText = attr;

//        self.inputTextView.text = [NSString stringWithFormat:@"%@%@",chatText,str];

    }

    else {

        if (chatText.length > 0) {

            NSInteger length = 1;

            if (chatText.length >= 2) {

                NSString *subStr = [chatText substringFromIndex:chatText.length-2];

                if ([_defaultEmoji containsObject:subStr]) {

                    length = 2;

                }

            }

            self.inputTextView.attributedText = [self backspaceText:attr length:length];

        }

    }

[self textViewDidChange:self.inputTextView];

}

解决也很简单,我再判断表情时，同时使用了下面的方法。这个方法我加在了NSString的扩展中。

+ (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 <= 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 (substring.length > 1) {

                                    const unichar ls = [substring characterAtIndex:1];

                                    if (ls == 0x20e3) {

                                        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 (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {

                                        returnValue = YES;

                                    }

                                }

                            }];


    return returnValue;

}

注意：下面的代码为更新版本，上面的代码还是太久远了，下面的也是网上找到的，感觉还比较新。

+ (void)load {


    VariationSelectors = [NSCharacterSet characterSetWithRange:NSMakeRange(0xFE00, 16)];


}





- (BOOL)isEmoji {


    if ([self rangeOfCharacterFromSet: VariationSelectors].location != NSNotFound) {


        return YES;


    }


    


    const unichar high = [self characterAtIndex: 0];


    


    // Surrogate pair (U+1D000-1F9FF)


    if (0xD800 <= high && high <= 0xDBFF) {


        const unichar low = [self characterAtIndex: 1];


        const int codepoint = ((high - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;


        


        return (0x1D000 <= codepoint && codepoint <= 0x1F9FF);


        


        // Not surrogate pair (U+2100-27BF)


    } else {


        return (0x2100 <= high && high <= 0x27BF);


    }


}