Flutter 常用的提示框showToast、showLoading、showConfirmDialog

这是几个常用的全局共用的提示框方法,在我之后的文章里可能会多次用到,这里统一记录一下。
以下方法全部写在lib/common/toast.dart中。

showToast

fluttertoast 适用于Flutter的Android和iOS的Toast库。
pubspec.yaml文件里添加:

fluttertoast: ^3.1.3
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';

void showToast(
  String text, {
  gravity: ToastGravity.CENTER,
  toastLength: Toast.LENGTH_SHORT,
}) {
  Fluttertoast.showToast(
    msg: text,
    toastLength: Toast.LENGTH_SHORT,
    gravity: ToastGravity.BOTTOM,
    timeInSecForIos: 1,
    backgroundColor: Colors.grey[600], // 灰色背景
    fontSize: 16.0,
  );
}

使用:

showToast("删除成功!");

showLoading

一个加载中的动画,不传text时,默认显示文字Loading...

void showLoading(context, [String text]) {
  text = text ?? "Loading...";
  showDialog(
      barrierDismissible: false,
      context: context,
      builder: (context) {
        return Center(
          child: Container(
            decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(3.0),
                boxShadow: [
                  //阴影
                  BoxShadow(
                    color: Colors.black12,
                    //offset: Offset(2.0,2.0),
                    blurRadius: 10.0,
                  )
                ]),
            padding: EdgeInsets.all(16),
            margin: EdgeInsets.all(16),
            constraints: BoxConstraints(minHeight: 120, minWidth: 180),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                SizedBox(
                  height: 30,
                  width: 30,
                  child: CircularProgressIndicator(
                    strokeWidth: 3,
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.only(top: 20.0),
                  child: Text(
                    text,
                    style: Theme.of(context).textTheme.body2,
                  ),
                ),
              ],
            ),
          ),
        );
      });
}

使用:

    showLoading(context, '删除中,请等待......');

showConfirmDialog

带有确定取消按钮的提示框,content是提示框的内容文字,confirmCallback是点击确定按钮的回调

void showConfirmDialog(BuildContext context,String content, Function confirmCallback) {
  showDialog(
      context: context,
      builder: (context) {
        return new AlertDialog(
          title: new Text("提示"),
          content: new Text(content),
          actions: [
            new FlatButton(
              onPressed: () {
                confirmCallback();
                Navigator.of(context).pop();
              },
              child: new Text("确认"),
            ),
            new FlatButton(
              onPressed: () {
                Navigator.of(context).pop();
              },
              child: new Text("取消"),
            ),
          ],
        );
      });
}

使用:

 showConfirmDialog(context, '确认删除该数据吗?', () {
          // print('点击了确定删除......');
          // 执行确定操作后的逻辑
 });

参考资料

fluttertoast
showDialog function
AlertDialog class: A material design alert dialog.
【Flutter】ActionSheet, Alert, Dialog

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