Flutter开发7：对话框

Material 库提供了三种基本对话框控件

• AlertDialog 通常用于提示型对话框
• SimpleDialog 通常用于列表型对话框
• Dialog 通常用于自定义布局元素的对话框

弹出对话框时，调用showDialog函数，将对话框控件传入，由于对话框本身是路由，所以关闭对话框时，需使用Navigator.of(context).pop()

除此外，还有一种iOS风格的基本对话框控件 CupertinoAlertDialog，用法与之类似，使用showCupertinoDialog函数显示，需要注意导入cupertino的包

按钮对话框

onPressed: () {
                  showDialog(
                      context: context,
                      builder: (BuildContext context) => AlertDialog(
                            title: const Text('标题'),
                            content: const Text('我是内容如果勒紧裤带健康肌肤克里斯丁就飞快的巨坑老师'),
                        actions: [
                          OutlinedButton(onPressed: (){print('取消');}, child: Text('取消')),
                          OutlinedButton(onPressed: (){print('确定');}, child: Text('确定')),
                        ],
                          ));
                },

20220510155758.jpg

提示对话框

onPressed: () {
                  showDialog(
                      context: context,
                      builder: (BuildContext context) => const AlertDialog(
                        content: Text('我是内容如果勒紧裤带健康肌肤克里斯丁就飞快的巨坑老师'),
                      ));
                },

20220510160005.jpg

列表对话框

onPressed: () {
                  showDialog(context: context, builder: (BuildContext context) => SimpleDialog(
                    title: const Text('列表对话框'),
                    children: [
                      SimpleDialogOption(
                        onPressed: (){print('选择第一项');},
                        child: const Text('第一项内容'),
                      ),
                      SimpleDialogOption(
                        onPressed: (){print('选择第er项');},
                        child: const Text('第er项内容'),
                      ),
                      SimpleDialogOption(
                        onPressed: (){print('选择第3项');},
                        child: const Text('第3项内容'),
                      ),
                      SimpleDialogOption(
                        onPressed: (){print('选择第4项');},
                        child: const Text('第4项内容'),
                      ),
                    ],

                  ));
                },

20220510160110.jpg

自定义对话框

onPressed: () {
                  showDialog(
                      context: context,
                      builder: (BuildContext context) => Dialog(
                        // child: Text('我是内容如果勒紧裤带健康肌肤克里斯丁就飞快的巨坑老师'),
                        child: Image.network('https://c-ssl.duitang.com/uploads/item/201812/01/20181201203342_KjwZR.jpeg'),
                      ));
                },

20220510160220.jpg

模态对话框

onPressed: () {
                  showModalBottomSheet(
                    context: context,
                    builder: (BuildContext context) {
                      return ListView.builder(
                        itemCount: 20,
                        itemBuilder: (BuildContext context, int index) {
                          return ListTile(
                            title: Text("$index", textAlign: TextAlign.center,),
                            onTap: () => Navigator.of(context).pop(),
                          );
                        },
                      );
                    },
                  );
                },

20220510160259.jpg

iOS风格模态对话框

onPressed: () {
                  showCupertinoModalPopup(
                      context: context,
                      builder: (BuildContext context) {
                        return CupertinoActionSheet(
                          title: const Text('提示'),
                          message: const Text('这是一个iOS风格的模态对话框'),
                          actions: <Widget>[
                            CupertinoActionSheetAction(
                              child: const Text('确定'),
                              onPressed: () {},
                              isDefaultAction: true,
                            ),
                            CupertinoActionSheetAction(
                              child: const Text('暂时取消'),
                              onPressed: () {},
                              isDestructiveAction: true,
                            ),
                            CupertinoActionSheetAction(
                              child: const Text('只是用一次'),
                              onPressed: () {},
                              isDestructiveAction: true,
                            ),
                          ],
                        );
                      }
                  );
                },

20220510160358.jpg

这里有一个好用的Flutter弹框库
flutter_smart_dialog: ^3.0.12

其他对话框

• showAboutDialog 关于对话框
• showDatePicker 日期选择器
• showTimePicker 时间选择器
• showCupertinoModalPopup + CupertinoTimerPicker iOS 风格时间选择器
• showCupertinoModalPopup + CupertinoDatePicker iOS 风格日期选择器