1、上传表情到后台 Unicode编码
NSString *uniStr = [NSString stringWithUTF8String:[comments UTF8String]];
NSData *uniData = [uniStr dataUsingEncoding:NSNonLossyASCIIStringEncoding];
NSString *goodStr = [[NSString alloc] initWithData:uniData encoding:NSUTF8StringEncoding] ;
2、显示后台返回的表情 Unicode 解码
NSString *str = comments;
constchar *jsonString = [str UTF8String]; // Emoji表情编解码
NSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];
NSString *goodMsg1 = [[NSString alloc] initWithData:jsonData encoding:NSNonLossyASCIIStringEncoding];
注：comments 上传字符串
