[英]getx obx not updating avatar image - Flutter GetX
我想要实现的是在选择图像时更改CircleAvatar
中的图像,这是代码:
ProfileController
:
class ProfileController extends GetxController {
final TextEditingController emailController = TextEditingController();
final ImagePicker _picker = ImagePicker();
Rx<String?> avatarPath = null.obs;
avatarFromCamera() async {
var localAvatar = await _picker.pickImage(
source: ImageSource.camera, imageQuality: 50
);
if (localAvatar != null) {
avatarPath = localAvatar.path.obs;
update();
}
}
avatarFromGallery() async {
var localAvatar = await _picker.pickImage(
source: ImageSource.gallery, imageQuality: 50
);
if (localAvatar != null) {
avatarPath = localAvatar.path.obs;
update();
}
}
String? emailValidator(String? value) {
if (value == null || value.isEmpty) {
return null;
}
if (!EmailValidator.validate(value, false)) {
return 'Invalid email address';
}
}
@override
void onClose() {
emailController.dispose();
super.onClose();
}
String? emailValidator(String? value) {
if (value == null || value.isEmpty) {
return null;
}
if (!EmailValidator.validate(value, false)) {
return 'Invalid email address';
}
}
void save(GlobalKey<FormState> profileFormKey) {
if (profileFormKey.currentState!.validate()) {
print('valid');
}
}
}
这是ProfileScreen
小部件:
lass ProfileScreen extends StatelessWidget {
final ProfileController _profileController = Get.put<ProfileController>(ProfileController());
GlobalKey<FormState> profileFormKey = GlobalKey<FormState>();
ProfileScreen({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Update user details'),
),
body: SingleChildScrollView(
child: Form(
key: profileFormKey,
child: Column(
children: [
Padding(
padding: const EdgeInsets.all(30.0),
child: TextFormField(
keyboardType: TextInputType.text,
controller: _profileController.emailController,
decoration: const InputDecoration(
labelText: 'Enter email',
),
validator: _profileController.emailValidator,
),
),
Center(
child: GestureDetector(
onTap: () {
showModalBottomSheet(
context: context,
builder: (BuildContext bc) {
return SafeArea(
child: Wrap(
children: <Widget>[
ListTile(
leading: const Icon(Icons.photo_library),
title: const Text('Photo Library'),
onTap: () {
_profileController.avatarFromGallery();
Navigator.of(context).pop();
}),
ListTile(
leading: const Icon(Icons.photo_camera),
title: const Text('Camera'),
onTap: () {
_profileController.avatarFromCamera();
Navigator.of(context).pop();
},
),
],
),
);
}
);
},
child: CircleAvatar(
radius: 55,
backgroundColor: Colors.pink,
child: Obx(() =>(_profileController.avatarPath.value != null)
? ClipRRect(
borderRadius: BorderRadius.circular(50),
child: Image.file(
File(_profileController.avatarPath.value!),
width: 100,
height: 100,
fit: BoxFit.fitHeight
),
)
: Container(
decoration: BoxDecoration(
color: Colors.grey[200],
borderRadius: BorderRadius.circular(50)),
width: 100,
height: 100,
child: Icon(
Icons.camera_alt,
color: Colors.grey[800],
),
),
),
),
)),
Container(
margin: const EdgeInsets.all(10),
width: double.infinity,
child: MaterialButton(
color: Colors.blue,
onPressed: () => _profileController.save(profileFormKey),
child: const Text(
'Submit',
style: TextStyle(color: Colors.white),
),
),
),
],
),
),
),
);
}
}
如您所见,我有Obx
和我的avatarPath
响应式,并且在我更改它的任何地方我都在运行update
,但它没有更新。 我还尝试使用空字符串作为imagePath
的初始值,例如Rx<String> avatarPath = ''.obs;
它不工作。 我做错了什么??? 谢谢指教!!!
有两点需要修改。 首先,更改avatarPath = localAvatar.path.obs;
with avatarPath.value = localAvatar.path;
. 因为localAvatar.path.obs
创建了新的 observable 并且更改不会反映给以前的观察者。
其次,创建一个新的无状态小部件,该小部件具有底部工作表构建器的小部件树,例如
showModalBottomSheet(
context: context,
builder: (BuildContext bc) {
return CustomBottomView();
}
);
然后在CustomBottomView
复制您的底部工作表小部件树。
class CustomBottomView extends GetView<ProfileController> {
return YourBottomSheetWidgetTreeHere();
}
不要担心 ProfileController 在这里。 您已经在之前的路线中将其放入 DI 中。 如果您仍然遇到问题,请先执行第一步,第二步肯定会解决它。
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