问题：
cocos 客户端UILabel 在ios平台显示玩家微信昵称时，遇到带emoji表情昵称显示乱码，安卓可正常显示。

解决方式：

收到服务端推送的玩家信息后，将昵称进行转码(lua例)：

function M.utf8_to_unicode(convertStr)
    if type(convertStr)~="string" then
        return convertStr
    end
    local resultStr=""
    local i=1
    local num1=string.byte(convertStr,i)
    
    while num1~=nil do
        local tempVar1,tempVar2
        if num1 >= 0x00 and num1 <= 0x7f then
            tempVar1=num1
            tempVar2=0
        elseif bit.band(num1,0xe0)== 0xc0 then
            local t1 = 0
            local t2 = 0
            t1 = bit.band(num1,bit.rshift(0xff,3))
            i=i+1
            num1=string.byte(convertStr,i)
            t2 = bit.band(num1,bit.rshift(0xff,2))
            tempVar1=bit.bor(t2,bit.lshift(bit.band(t1,bit.rshift(0xff,6)),6))
            tempVar2=bit.rshift(t1,2)
        elseif bit.band(num1,0xf0)== 0xe0 then
            local t1 = 0
            local t2 = 0
            local t3 = 0
            t1 = bit.band(num1,bit.rshift(0xff,3))
            i=i+1
            num1=string.byte(convertStr,i)
            t2 = bit.band(num1,bit.rshift(0xff,2))
            i=i+1
            num1=string.byte(convertStr,i)
            t3 = bit.band(num1,bit.rshift(0xff,2))
            tempVar1=bit.bor(bit.lshift(bit.band(t2,bit.rshift(0xff,6)),6),t3)
            tempVar2=bit.bor(bit.lshift(t1,4),bit.rshift(t2,2))
        end
        resultStr=resultStr..string.format("\\u%02x%02x",tempVar2,tempVar1)
        i=i+1
        num1=string.byte(convertStr,i)
    end
    return resultStr
end

再将返回的字符串传入OC进行解码：

//解码
const char *jsonString = [resultStr UTF8String];   
NSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];
NSString *nickName = [[NSString alloc] initWithData:jsonData encoding:NSNonLossyASCIIStringEncoding];

return nickName

返回的昵称可以在ios设备上正常显示。