The general structure of my code is that I have a UIKit app in which I am trying to embed a swiftui view. So I have a file called SettingsViewController which is as follows:
class SettingsViewController: UIViewController {
...
var items: [(SettingsView.Setting)] = ...
var actionsForItems: [() -> Void = []
@State var isOn: Bool = false
override func viewDidLoad() {
super.viewDidLoad()
actionsForItems = ...
...
addSettingCell(isOn: isOn)
let childView = UIHostingController(rootView: SettingsView(settings: items, actionsForSettings: actionsForItems))
addChild(childView)
childView.view.frame = container.bounds
container.addSubview(childView.view)
childView.didMove(toParent: self)
}
...
func addCell(isOn: Bool) {
items.insert((settingName, $isOn as AnyObject) as SettingsView.Setting)
actionsForItems.insert({
self.onSwitchValueChanged(isOn: isOn) //defined later
})
}
}
which creates a view called Settings View which is structured as follows:
struct SettingsView: View {
typealias Setting = (key: String, value: AnyObject?)
var settings: [Setting]
var actions: [() -> Void]
var body: some View {
List(settings.indices) { index in
...
SettingsWithSwitchView(setting: settings[index], action: actions[index], isOn: setting.value as Binding<Bool>)
}
Spacer()
}
}
and SettingsWithSwitchView is as follows:
struct SettingsWithSwitchView: View {
var setting: SettingsView.Setting
var action: () -> Void
@Binding var isOn: Bool {
willSet {
print("willSet: newValue =\(newValue) oldValue =\(isOn)")
}
didSet {
print("didSet: oldValue=\(oldValue) newValue=\(isOn)")
action()
}
}
var body: some View {
HStack {
Text(setting.key)
.foregroundColor(Color("GrayText"))
.font(Font.custom("OpenSans", size: 15))
Spacer()
Toggle(isOn: $isOn) {}
}
}
}
I read in another post here on Stack Overflow that calling didSet on the isOn property should be the way to accomplish this, but I need to call onSwitchValueChanged when the Toggle value is updated, but my current setup does not work. I would really appreciate some help to figure out how to do this. I can update with some other information if necessary.
