如何更新ViewPager中片段的文本视图(Kotlin)

class MyFragment : Fragment() {
    private lateinit var textView: TextView

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val view = inflater.inflate(R.layout.fragment_layout, container, false)
        textView = view.findViewById(R.id.text_view)
        return view
    }

    // 其他片段代码...
}

class MyPagerAdapter(fm: FragmentManager) : FragmentPagerAdapter(fm) {
    override fun getItem(position: Int): Fragment {
        return when (position) {
            0 -> Fragment1()
            1 -> Fragment2()
            // 其他片段...
            else -> throw IllegalArgumentException("Invalid position")
        }
    }

    override fun getCount(): Int {
        return 2 // 返回片段的数量
    }
}

class MainActivity : AppCompatActivity() {
    private lateinit var viewPager: ViewPager

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewPager = findViewById(R.id.view_pager)
        val adapter = MyPagerAdapter(supportFragmentManager)
        viewPager.adapter = adapter
    }

    // 其他活动代码...
}

val currentFragment = adapter.getItem(viewPager.currentItem) as MyFragment
currentFragment.textView.text = "新的文本"