如何在SwiftUI中检测TextField上的实时更改?

问题描述

我有一个简单的TextField可以像这样绑定到状态位置"，

I have a simple TextField that binds to the state 'location' like this,

TextField("Search Location", text: $location)

我想在每次该字段更改时调用一个函数，如下所示:

I want to call a function each time this field changes, something like this:

TextField("Search Location", text: $location) {
   self.autocomplete(location)
}

但是，这不起作用.我知道有一些回调，onEditingChanged-但是，这似乎只有在焦点集中时才会触发.

However this doesn't work. I know that there are callbacks, onEditingChanged - however this only seems to be triggered when the field is focussed.

如何在每次更新字段时调用此函数?

How can I get this function to call each time the field is updated?

推荐答案

您可以使用自定义闭包创建绑定，如下所示:

You can create a binding with a custom closure, like this:

struct ContentView: View {
    @State var location: String = ""

    var body: some View {
        let binding = Binding<String>(get: {
            self.location
        }, set: {
            self.location = $0
            // do whatever you want here
        })

        return VStack {
            Text("Current location: \(location)")
            TextField("Search Location", text: binding)
        }

    }
}

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