convert Android code to Objective-C IPhone code

Can any Developer please change this android code to Objective-C

I need this in the Objective-C format after it is done comment that

Any help will be appreciated

import java.util.HashMap;

public class RequestHeaders {
    // TODO : Change class to enum pattern base
    private String userToken,emailId;
    private static RequestHeaders instance;

    private static final String USER_EMAIL = "X-User-Email";
    private static final String USER_TOKEN = "X-User-Token";
    public static final String CONTENT_TYPE = "Accept";
    public static final String CONTENT_TYPE_JSON = "application/json";

    private RequestHeaders() {
    }

    public static RequestHeaders getInstance() {
        if(instance == null){
            instance = new RequestHeaders();
        }
        return instance;
    }

    public void setUserHeader(String userToken,String emailId){
        this.userToken = userToken;
        this.emailId = emailId;
    }

    public HashMap<String,String> getUserHeaderMap(){
        HashMap<String,String> map = new HashMap<String,String>();
        map.put(CONTENT_TYPE,CONTENT_TYPE_JSON);
        map.put(USER_EMAIL,"atishay@msample.com");
        map.put(USER_TOKEN,"LzBLYhq6VZx1yZRDKgCC");
        return map;
    }

    public HashMap<String,String> getContentHeaderMap(){
        HashMap<String,String> map = new HashMap<String,String>();
        map.put(CONTENT_TYPE,CONTENT_TYPE_JSON);
        return map;
    }

}