Flutter GetX状态管理
我开始学习颤振课程,在状态管理部分,我决定学习Getx状态管理。 无论如何,在本教程中,我试图改变图标状态时按下,但它没有 我是新手,如果你能帮我,我会很感激的 产品\u项目.省道Flutter GetX状态管理,flutter,dart,flutter-layout,state-management,flutter-getx,Flutter,Dart,Flutter Layout,State Management,Flutter Getx,我开始学习颤振课程,在状态管理部分,我决定学习Getx状态管理。 无论如何,在本教程中,我试图改变图标状态时按下,但它没有 我是新手,如果你能帮我,我会很感激的 产品\u项目.省道 import 'package:flutter/material.dart'; import 'package:getx_pattern/app/ui/android/products_overview/widgets/product_details.dart'; import 'package:get/get.da
import 'package:flutter/material.dart';
import 'package:getx_pattern/app/ui/android/products_overview/widgets/product_details.dart';
import 'package:get/get.dart';
import '../../../theme/app_theme.dart';
import './product.dart';
import './products.dart';
class ProductItem extends StatelessWidget {
final pIndex;
// final String title;
// final String imageUrl;
ProductItem({
this.pIndex,
});
productDetails() {
Get.to(
ProductDetailScreen(),
arguments: product.findById(pIndex.id).title,
transition: Transition.rightToLeft,
);
}
final Products product = Get.put(Products());
// final Product pp = Get.put(Product(
// id: null, title: null, description: null, price: null, imageUrl: null));
@override
Widget build(BuildContext context) {
return ClipRRect(
borderRadius: BorderRadius.circular(10.0),
child: GetBuilder<Products>(
builder: (_) => GridTile(
child: GestureDetector(
onTap: () => productDetails(),
child: Image.network(
product.findById(pIndex.id).imageUrl,
fit: BoxFit.cover,
),
),
footer: GridTileBar(
backgroundColor: Colors.black87,
leading: IconButton(
icon: Icon(product.findById(pIndex.id).isFavorite
? Icons.favorite
: Icons.favorite_border),
color: appThemeData.accentColor,
onPressed: () {
product.findById(pIndex.id).toggleFavoriteStatus();
// print(_.items[pIndex].isFavorite);
}),
trailing: IconButton(
icon: Icon(Icons.shopping_cart),
color: appThemeData.accentColor,
onPressed: () {}),
title: Text(
product.findById(pIndex.id).title,
textAlign: TextAlign.center,
),
)),
));
}
}
import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
class Product extends GetxController {
final String id;
final String title;
final String description;
final double price;
final String imageUrl;
bool isFavorite;
Product({
@required this.id,
@required this.title,
@required this.description,
@required this.price,
@required this.imageUrl,
this.isFavorite = false,
});
void toggleFavoriteStatus() {
isFavorite = !isFavorite;
update();
}
}
import 'package:get/get.dart';
import 'product.dart';
class Products extends GetxController {
List<Product> items = [];
Products();
@override
onInit() {
items = [
Product(
id: 'p1',
title: 'Red Shirt',
description: 'A red shirt - it is pretty red!',
price: 29.99,
imageUrl:
'https://cdn.pixabay.com/photo/2016/10/02/22/17/red-t-shirt-1710578_1280.jpg',
),
Product(
id: 'p2',
title: 'Trousers',
description: 'A nice pair of trousers.',
price: 59.99,
imageUrl:
'https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Trousers%2C_dress_%28AM_1960.022-8%29.jpg/512px-Trousers%2C_dress_%28AM_1960.022-8%29.jpg',
),
];
update();
super.onInit();
}
List get myitems => [...items];
Product findById(String id) {
return items.firstWhere((prod) => prod.id == id);
}
void addProduct() {
// _items.add(value);
update();
}
}
产品。省道
import 'package:flutter/material.dart';
import 'package:getx_pattern/app/ui/android/products_overview/widgets/product_details.dart';
import 'package:get/get.dart';
import '../../../theme/app_theme.dart';
import './product.dart';
import './products.dart';
class ProductItem extends StatelessWidget {
final pIndex;
// final String title;
// final String imageUrl;
ProductItem({
this.pIndex,
});
productDetails() {
Get.to(
ProductDetailScreen(),
arguments: product.findById(pIndex.id).title,
transition: Transition.rightToLeft,
);
}
final Products product = Get.put(Products());
// final Product pp = Get.put(Product(
// id: null, title: null, description: null, price: null, imageUrl: null));
@override
Widget build(BuildContext context) {
return ClipRRect(
borderRadius: BorderRadius.circular(10.0),
child: GetBuilder<Products>(
builder: (_) => GridTile(
child: GestureDetector(
onTap: () => productDetails(),
child: Image.network(
product.findById(pIndex.id).imageUrl,
fit: BoxFit.cover,
),
),
footer: GridTileBar(
backgroundColor: Colors.black87,
leading: IconButton(
icon: Icon(product.findById(pIndex.id).isFavorite
? Icons.favorite
: Icons.favorite_border),
color: appThemeData.accentColor,
onPressed: () {
product.findById(pIndex.id).toggleFavoriteStatus();
// print(_.items[pIndex].isFavorite);
}),
trailing: IconButton(
icon: Icon(Icons.shopping_cart),
color: appThemeData.accentColor,
onPressed: () {}),
title: Text(
product.findById(pIndex.id).title,
textAlign: TextAlign.center,
),
)),
));
}
}
import 'package:flutter/foundation.dart';
import 'package:get/get.dart';
class Product extends GetxController {
final String id;
final String title;
final String description;
final double price;
final String imageUrl;
bool isFavorite;
Product({
@required this.id,
@required this.title,
@required this.description,
@required this.price,
@required this.imageUrl,
this.isFavorite = false,
});
void toggleFavoriteStatus() {
isFavorite = !isFavorite;
update();
}
}
import 'package:get/get.dart';
import 'product.dart';
class Products extends GetxController {
List<Product> items = [];
Products();
@override
onInit() {
items = [
Product(
id: 'p1',
title: 'Red Shirt',
description: 'A red shirt - it is pretty red!',
price: 29.99,
imageUrl:
'https://cdn.pixabay.com/photo/2016/10/02/22/17/red-t-shirt-1710578_1280.jpg',
),
Product(
id: 'p2',
title: 'Trousers',
description: 'A nice pair of trousers.',
price: 59.99,
imageUrl:
'https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Trousers%2C_dress_%28AM_1960.022-8%29.jpg/512px-Trousers%2C_dress_%28AM_1960.022-8%29.jpg',
),
];
update();
super.onInit();
}
List get myitems => [...items];
Product findById(String id) {
return items.firstWhere((prod) => prod.id == id);
}
void addProduct() {
// _items.add(value);
update();
}
}
import'package:get/get.dart';
进口“产品.省道”;
类产品扩展了GetxController{
列表项=[];
产品();
@凌驾
onInit(){
项目=[
产品(
id:'p1',
标题:“红衫军”,
描述:“一件红色衬衫——它很红!”,
价格:29.99,
图像URL:
'https://cdn.pixabay.com/photo/2016/10/02/22/17/red-t-shirt-1710578_1280.jpg',
),
产品(
id:'p2',
标题:"长裤",,
描述:“一条漂亮的裤子。”,
价格:59.99,
图像URL:
'https://upload.wikimedia.org/wikipedia/commons/thumb/e/e8/Trousers%2C_dress_%28AM_1960.022-8%29.jpg/512px长裤%2C\u连衣裙\uu28am\u 1960.022-8%29.jpg',
),
];
更新();
super.onInit();
}
List get myitems=>[…项];
产品findById(字符串id){
返回项目.firstWhere((prod)=>prod.id==id);
}
void addProduct(){
//_项目。增加(价值);
更新();
}
}
产品网格
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import './product.dart';
import './product_item.dart';
import './products.dart';
class ProductsGrid extends StatelessWidget {
@override
Widget build(BuildContext context) {
return GetBuilder<Products>(
init: Products(),
builder: (data) => GridView.builder(
padding: const EdgeInsets.all(10.0),
itemCount: data.items.length,
itemBuilder: (ctx, index) => ProductItem(
pIndex: data.items[index],
),
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
childAspectRatio: 3 / 2,
crossAxisSpacing: 10,
mainAxisSpacing: 10,
)),
);
}
}
导入“包装:颤振/材料.省道”;
导入“package:get/get.dart”;
导入“/product.dart”;
导入“./product_item.dart”;
导入“/products.dart”;
类ProductsGrid扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回GetBuilder(
init:Products(),
生成器:(数据)=>GridView.builder(
填充:常数边集全部(10.0),
itemCount:data.items.length,
itemBuilder:(ctx,索引)=>ProductItem(
pIndex:data.items[索引],
),
gridDelegate:SliverGridDelegateWithFixedCrossAxisCount(
交叉轴计数:2,
儿童方面:3/2,
横轴间距:10,
平均间距:10,
)),
);
}
}
产品详细信息
import 'package:getx_pattern/app/ui/android/products_overview/widgets/products.dart';
import '../../../theme/app_theme.dart';
class ProductDetailScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: appThemeData,
home: SafeArea(
child: Scaffold(
appBar: AppBar(
title: GetBuilder<Products>(
init: Products(),
builder: (data) => Text(Get.arguments),
)),
),
),
);
}
}
import'包:getx_pattern/app/ui/android/products_overview/widgets/products.dart';
导入“../../theme/app_theme.dart”;
类ProductDetailScreen扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
debugShowCheckedModeBanner:false,
主题:appThemeData,
家:安全区(
孩子:脚手架(
appBar:appBar(
标题:GetBuilder(
init:Products(),
生成器:(数据)=>Text(Get.arguments),
)),
),
),
);
}
}
我刚刚解决了这个问题。
通过将方法从product.dart移动
void toggleFavoriteStatus() {
isFavorite = !isFavorite;
update();
}
飞镖
void toggleFavoriteStatus(String id) {
items.firstWhere((prod) => prod.id == id).isFavorite =
!items.firstWhere((prod) => prod.id == id).isFavorite;
update();
}
我刚刚解决了这个问题。
通过将方法从product.dart移动
void toggleFavoriteStatus() {
isFavorite = !isFavorite;
update();
}
飞镖
void toggleFavoriteStatus(String id) {
items.firstWhere((prod) => prod.id == id).isFavorite =
!items.firstWhere((prod) => prod.id == id).isFavorite;
update();
}
如果我使用的是get数据库获取,我不知道您真正想做什么 模型“?.”属性类似 实例:
Image.network(
product.findById(pIndex.id).imageUrl,
fit: BoxFit.cover,
),...
我使用:
Image.network(
product?.imageUrl,
fit: BoxFit.cover,
),...
希望对您有所帮助如果我使用的是get数据库获取,我不知道您真正想做什么 模型“?.”属性类似 实例:
Image.network(
product.findById(pIndex.id).imageUrl,
fit: BoxFit.cover,
),...
我使用:
Image.network(
product?.imageUrl,
fit: BoxFit.cover,
),...
希望对您有所帮助这是因为您正在更新
产品控制器,但是在GetBuilder
中使用产品控制器,我的意思是您的GetBuilder
必须使用更新的同一控制器,但您使用的是GetBuilder(…
(而不是GetBuilder(…
)
因此,有两种可能的解决方法:
第一:正如MNMB所说,是更新产品
控制器
第二:将GetBuilder(…
更改为GetBuilder(…
在ProductItem
小部件中。这是因为您正在更新product
控制器,但是使用GetBuilder
中的products
控制器,我的意思是您的GetBuilder
必须使用更新后但正在使用GetBuilder(…
(而不是GetBuilder(…
)
因此,有两种可能的解决方法:
第一:正如MNMB所说,是更新产品
控制器
第二:在ProductItem
小部件中将GetBuilder(…
更改为GetBuilder(…
)