iOS开发表情符号emojiUTF-8编码、Unicode、HTML显示

释放双眼,带上耳机,听听看~!

一、把含有表情的字符串编码 —- UTF-8

- (NSString *)emojiEncode{
NSString *uniStr = [NSString stringWithUTF8String:[self UTF8String]];
NSData *uniData = [uniStr dataUsingEncoding:NSNonLossyASCIIStringEncoding];
NSString *emojiText = [[NSString alloc] initWithData:uniData encoding:NSUTF8StringEncoding];
return emojiText;
}

二、把请求到的含有表情字符串数据解码,解码后直接在UILabel上显示 —- UTF-8

- (NSString *)emojiDecode{
const char *jsonString = [self UTF8String];
NSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];
NSString *emojiText = [[NSString alloc] initWithData:jsonData encoding:NSNonLossyASCIIStringEncoding];
return emojiText;
}

注意:这样做微信端不能显示表情,也不能显示微信端上传的表情。

三、使用网页形式的表情格式(&#数字;)显示表情

//遍历含有表情的字符串,把表情替换成HTML格式的
//把UITextView或者UItextField里面text直接拿出来进行表情格式化
//把格式化之后的数据上传服务器

-(NSString *)replaceEmoji:(NSString *)text
{
//过滤表情正则表达式
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201frn]" options:NSRegularExpressionCaseInsensitive error:nil];
// 对text字符串进行匹配
NSArray *matches = [regex matchesInString:text
options:0
range:NSMakeRange(0, text.length)];
// 遍历匹配后的每一条记录
NSString *result = text;
for (NSTextCheckingResult *match in matches) {
NSRange range = [match range];
NSString *target = [text substringWithRange:range];
NSLog(@"%@", target);
//把表情转换成HTML格式的
NSString *emojiS = [target emojiUnicodeToHTML];
//替换回原来的位置
result = [result stringByReplacingOccurrencesOfString:target withString:emojiS];
}
return result;
}

//把表情转成网页能显示型的HTML格式(&#数字;)微信直接显示

#define MULITTHREEBYTEUTF16TOUNICODE(x,y) (((((x ^ 0xD800) << 2) | ((y ^ 0xDC00) >> 8)) << 8) | ((y ^ 0xDC00) & 0xFF)) + 0x10000
- (NSString *)emojiUnicodeToHTML{
NSString *hexstr = @"";
if ([self length] >= 2) {
for (int i = 0; i < [self length] / 2 && ([self length] % 2 == 0) ; i++)
{
// three bytes
if (([self characterAtIndex:i*2] & 0xFF00) == 0 ) {
hexstr = [hexstr stringByAppendingFormat:@"Ox%1X 0x%1X",[self characterAtIndex:i*2],[self characterAtIndex:i*2+1]];
}
else
{// four bytes
hexstr = [hexstr stringByAppendingFormat:@"%1X ",MULITTHREEBYTEUTF16TOUNICODE([self characterAtIndex:i*2],[self characterAtIndex:i*2+1])];
}
}
NSLog(@"(unicode) [%@]",hexstr);
}
else
{
NSLog(@"(unicode) U+%1X",[self characterAtIndex:0]);
}
NSString *html = [NSString stringWithFormat:@"%lu",strtoul([hexstr UTF8String],0,16)];
return [NSString stringWithFormat:@"&#%@;",html];
}

//解析网页形式的表情格式在UILabel上显示
//把微信端表情转成Unicode编码(如果能支持unicode 字符串 那么直接获取U+1F604 输出即可,如果不支持,那么获取png图片显示即可,下面的convertSimpleUnicodeStr方法获取)
//把微信端的HTML形式的表情转换成iOS端显示用的Unicode格式

匹配HTML格式表情正则.png
- (NSString *)digitalEmojiToUnicode:(NSString *)string
{
//把微信端上传的表情处理成iOS字符串
NSString *text = [string htmlToString];
//匹配HTML格式表情正则
NSString *prefix = @"[^&#]*\;";
NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:prefix
options:NSRegularExpressionCaseInsensitive
error:nil];
// 对text字符串进行匹配
NSArray *matches = [regular matchesInString:text
options:0
range:NSMakeRange(0, text.length)];
// 遍历匹配后的每一条记录
NSString *result =  text;
for (NSTextCheckingResult *match in matches) {
NSRange range = [match range];
NSString *target = [text substringWithRange:range];
NSLog(@"%@", target);
//把HTML格式的表情转换为Unicode格式的
NSString *emojiS = [target emojiHTMLToUnicode];
//iOS 端直接支持unicode字符 (有一些高级表情会失败,返回nil)
NSString *convertUnicode = [emojiS convertSimpleUnicodeStr];
if (convertUnicode.length ==0) {
convertUnicode = @"❓";(高级表情显示不出来)
}
//把表情替换回原来的位置,然后就能直接用UILabel显示表情了
result = [result stringByReplacingOccurrencesOfString:[@"&#" stringByAppendingString:target] withString:convertUnicode];
}
return result;
}

注意:上面代码里面的正则表达式不对,符号被简书改了,看图片。

- (NSString *)emojiHTMLToUnicode{
NSString *result = [self stringByReplacingOccurrencesOfString:@"&#" withString:@""];
result = [result stringByReplacingOccurrencesOfString:@";" withString:@""];
NSString *hexString = [NSString stringWithFormat:@"U+%@",[[NSString alloc] initWithFormat:@"%1X",[result intValue]]];
return hexString;
}

//这段函数作用是将 U+1F591 转换为 U0001F591
//如果为 U+2500 那么就是补全为 U00002500
//返回的sendStr就是可以直接在UILabel上显示的表情

- (NSString *)convertSimpleUnicodeStr{
NSString *strUrl = [self stringByReplacingOccurrencesOfString:@"U+" withString:@""];
unsigned long  unicodeIntValue= strtoul([strUrl UTF8String],0,16);
//   UTF32Char inputChar = unicodeIntValue ;// 变成utf32
unsigned long inputChar = unicodeIntValue ;// 变成utf32
//    inputChar = NSSwapHostIntToLittle(inputChar); // 转换成Little 如果需要
inputChar = NSSwapHostLongToLittle(inputChar); // 转换成Little 如果需要
NSString *sendStr = [[NSString alloc] initWithBytes:&inputChar length:4 encoding:NSUTF32LittleEndianStringEncoding];
NSLog(@"%@",sendStr);
return sendStr;

}

//网页内容转String

- (NSString *)htmlToString{
NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
if (data.length > 0) {
return  [[NSAttributedString alloc] initWithData:data options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType,NSCharacterEncodingDocumentAttribute:[NSNumber numberWithInteger:NSUTF8StringEncoding]} documentAttributes:nil error:nil].string;
}
return @"";
}

注意:这个方法是把网页格式的数据变成字符串

慢慢来,一步一个巴掌印。。。。。

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