我试图更新数组项与键入新值到文本字段,但列表不更新与编辑的值。
我的密码是:
型号:
struct WalletItem: Identifiable{
let id = UUID()
var name:String
var cardNumber:String
var type:String
var cvc:String
let pin:String
var dateOfExpiry:String
}
模型视图:
class Wallet: ObservableObject{
@Published var wallets = [
WalletItem(name: "BSB", cardNumber: "123456789", type: "master card", cvc: "1234", pin: "1234", dateOfExpiry: "2016-06-29"),
WalletItem(name: "Alpha bank", cardNumber: "123456789", type: "master card", cvc: "1234", pin: "1234", dateOfExpiry: "2017-03-12"),
WalletItem(name: "MTБ", cardNumber: "123456789", type: "master card", cvc: "1234", pin: "1234", dateOfExpiry: "2020-11-12"),
]
}
首次查看:
struct WalletListView: View {
// Properties
// ==========
@ObservedObject var wallet = Wallet()
@State var isNewItemSheetIsVisible = false
var body: some View {
NavigationView {
List(wallet.wallets) { walletItem in
NavigationLink(destination: EditWalletItem(walletItem: walletItem)){
Text(walletItem.name)
}
}
.navigationBarTitle("Cards", displayMode: .inline)
.navigationBarItems(
leading: Button(action: { self.isNewItemSheetIsVisible = true
}) {
HStack {
Image(systemName: "plus.circle.fill")
Text("Add item")
}
}
)
}
.sheet(isPresented: $isNewItemSheetIsVisible) {
NewWalletItem(wallet: self.wallet)
}
}
}
和次视图:
struct EditWalletItem: View {
@State var walletItem: WalletItem
@Environment(\.presentationMode) var presentationMode
var body: some View {
Form{
Section(header: Text("Card Name")){
TextField("", text: $walletItem.name)
}
}
.navigationBarItems(leading:
Button(action: {
self.presentationMode.wrappedValue.dismiss()
})
{
Text("Back")
}, trailing:
Button(action: {
self.presentationMode.wrappedValue.dismiss()
})
{
Text("Save")
})
}
}
P.S:如果我使用@Binding而不是@State,我会在第一个视图中得到一个错误:初始化程序init(_:)
要求Binding<String>
符合StringProtocol
2条答案
按热度按时间5fjcxozz1#
以下是修改后的部分(经过测试,可在Xcode 11.2 / iOS 13.2上运行):
1.当然过装订
1.传球的地方
vjrehmav2#
ForEach(Array(list.enumerated()))
只有在列表是Array而不是ArraySlice时才能正常工作,并且它有复制列表的缺点。更好的方法是使用
.indexed()
助手:示例:
参见: