android-The method findViewById(int) is undefined for the type ContactMainFragment报错

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        
        mTitleNameView = (TextView) findViewById(R.id.ivTitleName);
        mTitleNameView.setVisibility(View.VISIBLE);
        mTitleNameView.setText(R.string.company_name);

提示：意思应该是提示找不到相应组件而得不到组件ID

解决方法：加上view.即可

mTitleNameView = (TextView) view.findViewById(R.id.ivTitleName);