[英]Multiple selections in SwiftUI ForEach
我正在嘗試選擇 ForEach 視圖的多個視圖,但它沒有反映我的選擇。 我找到了一個解決方案,但我似乎沒有實時工作,它只更改數據,而不是視圖。我返回並重新打開視圖,它反映了更改。 另外,一旦我選擇了多個選項,我需要將它發送到服務器,我怎么知道我的選擇是什么? 我想我應該再次將 userProfile.domainsOfInterest 映射到 viewModel.domains。 這是我的屏幕代碼:
struct DomainsOfInterestView: View {
@EnvironmentObject var userProfile: UserProfile
@ObservedObject var viewModel: DomainsViewModel = DomainsViewModel()
var body: some View {
VStack(alignment: .center) {
HStack {
Text("Choose domains of interest for your profile")
.foregroundColor(Color.orGrayColor)
.font(.custom("SFProDisplay-Regular", size: 16))
Spacer()
}.padding(.bottom, 16)
VStack{
ScrollView {
ForEach(viewModel.domains, id: \.self) {item in
DomainOfInterestElement(interestDomain: item, isSelected: self.userProfile.domainsOfInterest.contains(item)) {
if self.userProfile.domainsOfInterest.contains(item) {
self.userProfile.domainsOfInterest.removeAll(where: { $0 == item })
}
else {
self.userProfile.domainsOfInterest.append(item)
}
}
}
}
.padding([.top, . bottom], 15)
}
.background(Color.white)
.cornerRadius(8)
Spacer()
OrangeButton(action: {
}) {
Text("Save")
}.padding([.leading, .trailing, .top], 30)
.padding(.bottom, 24)
}.padding([.leading, .trailing], 12)
.navigationBarTitle("Domains of interest")
.background(Color.orBackgroundGrayColor.edgesIgnoringSafeArea(.all))
}
}
ForEach 的觀點:
struct DomainOfInterestElement: View {
var interestDomain: InterestDomain
var isSelected: Bool
var action: () -> Void
var body: some View {
Button(action: {
self.action()
}) {
VStack {
HStack {
checkBoxView()
.frame(width: 36, height: 36)
textView().font(.custom("SFProDisplay-Regular", size: 16))
Spacer()
}
}
}
}
func checkBoxView() -> Image {
switch isSelected {
case true:
return Image(uiImage: #imageLiteral(resourceName: "check-box-active-2-1")).renderingMode(.original)
case false:
return Image(uiImage: #imageLiteral(resourceName: "check-box-active-1")).renderingMode(.original)
}
}
func textView() -> Text {
switch isSelected {
case true:
return Text(interestDomain.name)
.foregroundColor(.black)
case false:
return Text(interestDomain.name)
.foregroundColor(Color.orGrayColor)
}
}
}
我希望下面的代碼可以幫助你,只是簡單的列表磁帶的屬性更改,然后收集所有選定的真實項目來處理它們,
List(list){item in
Button(action: {
if let index = self.list.firstIndex(where: {$0.id == item.id }){
self.list[index].isSelected = !item.isSelected
}
}) {
Image(systemName: item.isSelected ? "checkmark.circle" : "circle")
.foregroundColor(item.isSelected ? Color.black : Color.gray)
.font(Font.title.weight(.light))
}
}
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