emoji转码

//编码
NSString *str = @"😊";
NSString *uniStr = [NSString stringWithUTF8String:[str UTF8String]];
NSData *uniData = [uniStr dataUsingEncoding:NSNonLossyASCIIStringEncoding];
NSString *goodStr = [[NSString alloc] initWithData:uniData encoding:NSUTF8StringEncoding] ;
NSLog(@"---编码--->[%@]",goodStr);

//解码
const char *jsonString = [goodStr UTF8String];   // goodStr 服务器返回的 json
NSData *jsonData = [NSData dataWithBytes:jsonString length:strlen(jsonString)];
NSString *goodMsg1 = [[NSString alloc] initWithData:jsonData encoding:NSNonLossyASCIIStringEncoding];
NSLog(@"---解码--->[%@]",goodMsg1);