How can I cast an @Binding in Swift

问题

In swift I can cast an Int to a Double with Int(doubleVariable).

But how can I cast a Binding < Double > to a Binding < Int > ?

Then I could pass an @Binding var intVar: Int to a function requiring a Double binding.

(The context of this is that I have an Int which I want to pass to a Slider in SwiftUI.)

回答1:

I don’t think there’s a way to cast but you can create another Binding based on the first one:

import SwiftUI
var d = 1.0
// Create a Binding<Double> (for lack of another source)
var bd = Binding<Double>(get: { d }, set: { d = $0 })
// "Convert" to Binding<Int> by recreating another Binding
let bi = Binding<Int>(get: { Int(bd.wrappedValue) },
                      set: { bd.wrappedValue = Double($0) })

来源：https://stackoverflow.com/questions/58421913/how-can-i-cast-an-binding-in-swift