如何在Swift中强制转换@Binding [英] How can I cast an @Binding in Swift

问题描述

我可以很快地将一个Int转换为具有Int(doubleVariable)的Double.

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

但是我该如何投射绑定< Double>到绑定< Int>?

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

然后我可以将@Binding var intVar:Int传递给需要Double绑定的函数.

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

(其上下文是我有一个要传递给SwiftUI中的Slider的Int.)

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

推荐答案

我认为没有办法进行投射，但是您可以根据第一个绑定创建另一个绑定:

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) })

这篇关于如何在Swift中强制转换@Binding的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！