Arrays @在多个ViewModels中发布的阵列-SwiftUI
我的应用程序只有两个视图,两个视图都有自己的ViewModel。ViewA显示和操作selectedNumbers数组中的对象。ViewB拥有所有可用的对象(数字)-在此视图中,我希望操纵ViewA使用的selectedNumbers数组 我试图找出,如何在这两个视图模型之间共享这些SelectedNumber数组。我试着使用EnvironmentObject、StaticObject等,但没有任何东西能满足我的需要。我应该使用什么方法来达到预期的结果。谢谢你的帮助Arrays @在多个ViewModels中发布的阵列-SwiftUI,arrays,swiftui,viewmodel,shared,Arrays,Swiftui,Viewmodel,Shared,我的应用程序只有两个视图,两个视图都有自己的ViewModel。ViewA显示和操作selectedNumbers数组中的对象。ViewB拥有所有可用的对象(数字)-在此视图中,我希望操纵ViewA使用的selectedNumbers数组 我试图找出,如何在这两个视图模型之间共享这些SelectedNumber数组。我试着使用EnvironmentObject、StaticObject等,但没有任何东西能满足我的需要。我应该使用什么方法来达到预期的结果。谢谢你的帮助 import SwiftUI
import SwiftUI
struct ViewA: View {
@ObservedObject var viewModel = ViewModelA()
var body: some View {
VStack {
Text("\(viewModel.number)")
.font(.largeTitle)
.padding()
.onTapGesture {
viewModel.showNext()
}
ViewB()
}
}
}
class ViewModelA: ObservableObject {
var numbers: [Int] = []
@Published var number: Int
var index = 0
init() {
number = numbers.isEmpty ? 0 : numbers[index]
}
func showNext() {
guard !numbers.isEmpty else { return }
if index < numbers.count - 1 {
index += 1
} else {
index = 0
}
number = numbers[index]
}
}
struct ViewB: View {
@ObservedObject var viewModel = ViewModelB()
var body: some View {
HStack {
ForEach(viewModel.numbers, id: \.self) { number in
Text("\(number)")
.foregroundColor(viewModel.selectedNumbers.contains(number) ? .red : .black)
.onTapGesture {
viewModel.updateSelection(number)
}
}
}
}
}
class ViewModelB: ObservableObject {
@Published var numbers: [Int] = []
@Published var selectedNumbers: [Int] = []
init() {
numbers.append(contentsOf: [1,2,3,4,5,6,7,8])
}
func updateSelection(_ number: Int) {
if selectedNumbers.contains(number) {
selectedNumbers.remove(number)
} else {
selectedNumbers.append(number)
}
}
}
extension Array where Element: Equatable {
mutating func remove(_ object: Element) {
guard let index = firstIndex(of: object) else {return}
remove(at: index)
}
}
导入快捷界面
结构视图:视图{
@ObservedObject var viewModel=ViewModelA()
var body:一些观点{
VStack{
文本(“\(viewModel.number)”)
.font(.largeTitle)
.padding()
.ontapsigne{
viewModel.showNext()
}
ViewB()
}
}
}
类ViewModelA:ObservableObject{
变量编号:[Int]=[]
@已发布变量编号:Int
var指数=0
init(){
number=numbers.isEmpty?0:numbers[索引]
}
func showNext(){
守卫!number.isEmpty else{return}
如果索引
您仍然可以保持逻辑独立,但是您需要保持一个单一的真相来源,如果您想在视图之间共享数据,您需要传递绑定
,或者您也可以在子视图之间共享@ObservedObject
import SwiftUI
struct ViewA: View {
@ObservedObject var viewModel = ViewModelA(modelB: ViewModelB())
var body: some View {
VStack {
Text("\(viewModel.number)")
.font(.largeTitle)
.padding()
.onTapGesture {
viewModel.showNext()
}
ViewB(model: viewModel)
}
}
}
class ViewModelA: ObservableObject {
var numbers: [Int] = []
@Published var number: Int
@Published var modelB:ViewModelB
var index = 0
init(modelB:ViewModelB) {
self.modelB = modelB
number = numbers.isEmpty ? 0 : modelB.selectedNumbers[index]
}
func showNext() {
guard !modelB.selectedNumbers.isEmpty else { return }
if index < modelB.selectedNumbers.count - 1 {
index += 1
} else {
index = 0
}
number = modelB.selectedNumbers[index]
}
}
struct ViewB: View {
@ObservedObject var model : ViewModelA
var body: some View {
HStack {
ForEach(model.modelB.selectedNumbers, id: \.self) { number in
Text("\(number)")
.foregroundColor(model.modelB.selectedNumbers.contains(number) ? .red : .black)
.onTapGesture {
model.modelB.updateSelection(number)
}
}
}
}
}
struct ViewModelB {
var selectedNumbers: [Int] = []
init() {
selectedNumbers.append(contentsOf: [1,2,3,4,5,6,7,8])
}
mutating func updateSelection(_ number: Int) {
if selectedNumbers.contains(number) {
selectedNumbers.remove(number)
} else {
selectedNumbers.append(number)
}
}
}
extension Array where Element: Equatable {
mutating func remove(_ object: Element) {
guard let index = firstIndex(of: object) else {return}
remove(at: index)
}
}
导入快捷界面
结构视图:视图{
@ObservedObject var viewModel=ViewModelA(modelB:ViewModelB())
var body:一些观点{
VStack{
文本(“\(viewModel.number)”)
.font(.largeTitle)
.padding()
.ontapsigne{
viewModel.showNext()
}
ViewB(模型:viewModel)
}
}
}
类ViewModelA:ObservableObject{
变量编号:[Int]=[]
@已发布变量编号:Int
@已发布的var模型B:ViewModelB
var指数=0
初始化(modelB:ViewModelB){
self.modelB=modelB
number=numbers.isEmpty?0:modelB.selectedNumbers[索引]
}
func showNext(){
guard!modelB.selectedNumbers.isEmpty else{return}
如果索引
您有两个不同的真相来源,您应该使用绑定重新考虑您的模型设计,并保留单一真相来源您的意思是什么?只使用一个ViewModel->ViewModelA并将其绑定到ViewB?我试图把这两种观点的逻辑分开。。