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→@Binding を経由して親子ViewでAlertの表示フラグを共有
====@Binding を経由して親子ViewでAlertの表示フラグを共有====
[[File:swiftui_share_object.png|300px]]
*@Binding でView間で変数を共有
*呼び出し側は＠State
<pre>
struct HostListView: View {
@ObservedObject var hosts = HostList()
@State var isSaveAlert = false
var body: some View {
VStack {
let columns =
[GridItem(.adaptive(minimum: 250, maximum: 800))]
ScrollView {
LazyVGrid(columns: columns, spacing:10) {
ForEach(hosts.hosts, id: \.id) { host in
HostView(host:host, isSaveAlert: $isSaveAlert, alertMessage: $alertMessage)
}
} .padding(20)
}.alert(isPresented: $isSaveAlert, content: {
Alert(title: Text("Title"),message: Text(alertMessage),
primaryButton: .default(Text("OK"), action: {}),
secondaryButton: .cancel(Text("Cancel"),action: {}))
})
}
}
}
struct HostView : View {
@ObservedObject var host: WoL.Host
@Binding var isSaveAlert: Bool
var body: some View {
VStack{
HStack {
Button(action: {
self.isSaveAlert = true
}) {
Image(systemName: "square.and.arrow.down")
}.help(Text("save"))
:
}
}
}
}
</pre>
==メニュー==
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