I have a Binding like this:
@State var entires: [Entry]
Where Entry has one property called amount which is a float.
Now I'm trying to add it to a TextField inside a List:
List {
ForEach(entries, id: \.self) { (entry: Entry) in
TextField("Amount", text: "\(entry.amount)")
}
}
Then its telling me that its a String and not Binding<String>. But where to place the $ to have it right?
Here is a demo of possible solution (tested with Xcode 11.4 / iOS 13.4)
struct Entry {
var amount: Float
}
struct ContentView: View {
@State var entries: [Entry] = [Entry(amount: 1.0)]
var body: some View {
List {
ForEach(entries.indices, id: \.self) {
self.row(for: $0)
}
}
}
func row(for index: Int) -> some View {
let text = Binding<String>(
get: { String(self.entries[index].amount) },
set: { self.entries[index].amount = Float($0) ?? 0 }
)
return TextField("Amount", text: text)
}
}
You need to define a create a Binding yourself that does the Float-String conversion. You can achieve this using the Binding(get:set:) initialiser.
You also need to call ForEach on entries.indices and access each Entry by index, since the loop variable is immutable, so you couldn't pass entry directly to a mutable Binding if you iterated over entries instead of entries.indices.
ForEach(entries.indices, id: \.self) { index -> TextField<Text> in
let binding = Binding<String>(
get: { self.entries[index].amount.description },
set: { if let newValue = Float($0) { self.entries[index].amount = newValue }}
)
return TextField("Amount", text: binding)
}