I am looking at how I can change a param using a call back.
struct MainView: View {
@State var name = "Original Name"
var body: some View {
VStack(spacing: 16) {
FirstView(doChangeName: self.changeName)
Text(name)
}
.padding(32)
}
func changeName() {
print("Changing Name")
self.name = "Another Name"
}
}
struct FirstView : View {
var doChangeName : () -> ()
var body: some View {
Button(action: {
let newName = "New Name"
self.doChangeName()
}) { Text("Change Name") }
}
}
When I click on change name button, it will be change to "Another Name". How can it be a param derived from a child view and in this case variable newName done through call back.
In another words, pass the newName variable back to function changeName.
>Solution :
You can do it easily with binding but as you mention you want to use a closure with param.
Change closure syntax.
struct MainView: View {
@State var name = "Original Name"
var body: some View {
VStack(spacing: 16) {
FirstView(doChangeName: self.changeName)
Text(name)
}
.padding(32)
}
func changeName(_ name: String) { // <== Here
print("Changing Name")
self.name = name
}
}
struct FirstView : View {
var doChangeName : (String) -> () // <== Here
var body: some View {
Button(action: {
self.doChangeName("New Name")
}) { Text("Change Name") }
}
}