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/// `ObjectBinding` used as a way to create a `Binding` from a `BindableObject`. In this case the ViewModel
/// complies with `BindableObject` which is then translated into a `Binding` which is what `Toggle` is expecting
/// NOTE: Since it's a `DynamicViewProperty`, after its value is changed, the body will be updated.
class ViewModel: BindableObject {
let didChange = PassthroughSubject<ViewModel, Never>()
var isEnabled = false {
didSet {
didChange.send(self)
}
}
}
struct ObjectBinding_ExampleView : View {
@ObjectBinding(initialValue: ViewModel()) var viewModel: ViewModel
var body: some View {
Toggle(isOn: $viewModel.isEnabled) {
Text("The value is " + "\(viewModel.isEnabled)")
}
}
}
/// ==================================
/// `State` used as a quick way to store a mutable, bindable entity.
/// NOTE: Since it's a `DynamicViewProperty`, after its value is changed, the body will be updated.
struct State_ExampleView : View {
@State var value: Bool
var body: some View {
Toggle(isOn: $value) {
Text("The value is " + "\($value)")
}
}
}
/// ==================================
/// `Environment` used to get values from `EnvironmentValues`. These range from `Calendar` to `ColorScheme`, `Fonts`, `Locale`
/// and others
struct ContentView : View {
@Environment(\.isEnabled) var enabled: Bool
var body: some View {
Text("The value is " + "\(enabled)")
}
}
/// ==================================
/// `@EnvironmentObject` acts like a DI Container for Binds. You can register anything that conforms to `Bindable` via
/// `.environmentObject` and use `@EnvironmentObject` to read that value from the container.
/// NOTE: Since it's a `DynamicViewProperty`, after its value is changed, the body will be updated.
class ViewModel: BindableObject {
let didChange = PassthroughSubject<ViewModel, Never>()
var isEnabled = false {
didSet {
didChange.send(self)
}
}
}
struct ContentView : View {
@EnvironmentObject var viewModel: ViewModel
var body: some View {
Toggle(isOn: $viewModel.isEnabled) {
Text("The value is " + "\(viewModel.isEnabled)")
}
}
}
/// You create the ContentView and associate the type
/// The `var viewModel` is set automatically for you.
let view = ContentView().environmentObject(ViewModel())
/// ==================================
/// `Binding` is a wraper for a setter and a getter. It's the `@ObjectBinding` in this case that kicks the view
/// renderization.
class ViewModel: BindableObject {
let didChange = PassthroughSubject<ViewModel, Never>()
var textInput = "" {
didSet {
didChange.send(self)
}
}
}
struct ContentView : View {
@ObjectBinding var viewModel: ViewModel
init(viewModel: ViewModel) {
self.viewModel = viewModel
}
var body: some View {
List {
Text("email")
TextField(viewModel[\.textInput])
}
}
}
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