我不能使用findViewById

为什么我不能findViewById在这个文件中使用？

Regfragment:

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;


public class RegFragment extends Fragment {

EditText text1,text2,text3;
Button btn1;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.reg_layout, container, false);

    return rootView;


}
}

然后我试着这样做:

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;


public class RegFragment extends Fragment {

EditText text1,text2,text3;
Button btn1;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.reg_layout, container, false);

    return rootView;

    text1 = (EditText) findViewById(R.id.text1);   -----> ERROR....
}
}

我得到错误
是因为我使用碎片？