DialogFragment從單詞可以看到是Dialog與Fragment組合而成捷凄。本質(zhì)上DialogFragment其實(shí)是一個(gè)Fragment籍铁，內(nèi)部持有一個(gè)Dialog，擁有fragment的生命周期趣苏，DialogFragment有兩個(gè)比較重要的方法onCreateDialog和onCreateView

onCreateDialog和onCreateView只需要實(shí)現(xiàn)一個(gè)就可以了

如果兩個(gè)都寫(xiě)并且onCreateDialog返回了一個(gè)Dialog子類實(shí)例對(duì)象扰楼，則onCreateView返回的視圖無(wú)效

class MyAlertDialogFragment : DialogFragment() {

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val builder = AlertDialog.Builder(requireActivity())
            .setTitle("Alert Dialog Title")
            .setMessage("This is an example of an AlertDialog.")
            .setPositiveButton("OK") { dialog, which ->
                // 響應(yīng)正面按鈕點(diǎn)擊事件
            }
            .setNegativeButton("Cancel") { dialog, which ->
                dialog.dismiss()
            }

        return builder.create() // 返回 AlertDialog
    }
}

// 顯示 DialogFragment
val dialogFragment = MyAlertDialogFragment()
dialogFragment.show(supportFragmentManager, "myAlertDialog")

1、簡(jiǎn)單UI：比如如返回一個(gè)系統(tǒng)的AlertDialog只需要在onCreateDialog返回一個(gè)AlertDialog即可
2划鸽、自定義復(fù)雜UI输莺，實(shí)現(xiàn)onCreateView返回自定義視圖

加載自定義視圖的方式

1、使用普通

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    return inflater.inflate(R.layout.my_dialog,container,false)
}

2裸诽、使用View Binding

class MyDialogFragment : DialogFragment() {

    private var _binding: DialogFragmentLayoutBinding? = null
    private val binding get() = _binding!!

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        _binding = DialogFragmentLayoutBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        // 設(shè)置按鈕點(diǎn)擊事件
        binding.button.setOnClickListener {
            dismiss() // 關(guān)閉對(duì)話框
        }
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null // 清理綁定
    }
}

3嫂用、使用Data Binding

class MyDialogFragment : DialogFragment() {

    private var _binding: DialogFragmentLayoutBinding? = null
    private val binding get() = _binding!!

    private lateinit var viewModel: MyViewModel

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        _binding = DataBindingUtil.inflate(inflater, R.layout.dialog_fragment_layout, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        viewModel = ViewModelProvider(this).get(MyViewModel::class.java)
        binding.viewModel = viewModel // 綁定 ViewModel
        binding.lifecycleOwner = viewLifecycleOwner // 設(shè)置生命周期所有者
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null // 清理綁定
    }
}