Here is my test code:
struct ArrView: View {
@State var arr: [String] = ["first", "second"]
var body: some View {
VStack {
Button("append") {self.arr.append("item\(self.arr.count)")}
List(arr.indices) {row in
Text(self.arr[row])
}
}
}
}
When the 'append' Button was pressed, the List view didn't update.
Am I doing wrong?
You can use ForEach<Range>() only if the provided data is a constant, otherwise you need to use ForEach(_:id:content:) and provide an id explicitly, like this:
struct ArrView: View {
@State var arr: [String] = ["first", "second"]
var body: some View {
VStack {
Button("append") {self.arr.append("item\(self.arr.count)")}
List(arr, id: \.self) { item in
Text(item)
}
}
}
}
I don't think it is the proper way to create List view. Here is a sample
struct ContentView: View {
@State var arr: [String] = ["first", "second"]
var body: some View {
VStack {
Button("append") {self.arr.append("item\(self.arr.count)")}
List(self.arr, id: \.self) { str in
Text(str)
}
}
}
}
.id(self.arr.count)after list