Flutter实现一个自定义的弹窗

        标题、内容、取消，确认按钮都可以自定义，颜色也支持自定义，可以监听点击事件，运用的知识就是前面总结的flutter知识点的综合运用，效果如下。

        直接上代码：

import 'package:flutter/material.dart';

class AppDialog extends Dialog {
  final String title;
  final String? confirm;
  final String? cancel;
  final String? content;
  final String? cancelColor;
  final String? confirmColor;
  final bool? showCancel;
  final OnDialogClickListener? clickListener;

  const AppDialog(
      {this.cancelColor = '#00000',
      this.confirmColor = ''#576B95'',
      this.title = '标题',
      this.cancel = '取消',
      this.confirm = '确定',
      this.content = '',
      this.showCancel = true,
      this.clickListener,
      Key? key})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Container(
        constraints: const BoxConstraints(maxHeight: 600),
        width: double.infinity,
        margin: const EdgeInsets.all(30),
        decoration: const ShapeDecoration(
            color: Colors.white,
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(Radius.circular(5.0)))),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.start,
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              margin: const EdgeInsets.only(top: 12, bottom: 14),
              child: Text(
                title,
                style: const TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                    color: Colors.black),
              ),
            ),
            Offstage(
              offstage: content!.isEmpty,
              child: Container(
                margin: const EdgeInsets.only(bottom: 17),
                child: Text(
                  content!,
                  style:
                      TextStyle(fontSize: 17, color: ThemeColors.color7f7f7f),
                ),
              ),
            ),
            Container(
              height: 0.7,
              color: ThemeColors.colorE8E8E8,
            ),
            getBottomWidget(context),
          ],
        ),
      ),
    );
  }

  getBottomWidget(context) {
    if (showCancel!) {
      return SizedBox(
        height: 43,
        child: Row(
          children: [
            Expanded(
              child: InkWell(
                child: Container(
                  alignment: Alignment.center,
                  child: Text(
                    cancel!,
                    style: const TextStyle(
                        fontSize: 17,
                        color: Colors.black,
                        fontWeight: FontWeight.bold),
                  ),
                ),
                onTap: () => {
                  clickListener?.onCancel(),
                  Navigator.of(context).pop(),
                },
              ),
            ),
            Container(
              height: 43,
              width: 0.7,
              color: ThemeColors.colorE8E8E8,
            ),
            Expanded(
              child: InkWell(
                child: Container(
                  alignment: Alignment.center,
                  child: Text(
                    confirm!,
                    style: TextStyle(
                        fontSize: 17,
                        color: ThemeColors.color576B95,
                        fontWeight: FontWeight.bold),
                  ),
                ),
                onTap: () => {clickListener?.onConfirm(), Navigator.of(context).pop()},
              ),
            ),
          ],
        ),
      );
    } else {
      return InkWell(
        child: Container(
          height: 43,
          alignment: Alignment.center,
          child: Text(
            confirm!,
            style: TextStyle(
                fontSize: 17,
                color: ThemeColors.color576B95,
                fontWeight: FontWeight.bold),
          ),
        ),
        onTap: () => {
          clickListener?.onConfirm(),
          Navigator.of(context).pop(),
        },
      );
    }
  }
}

abstract class OnDialogClickListener {
  void onConfirm();
  void onCancel();
}