如何检测 SwiftUI 中 TextField 的实时更改? [英] How to detect live changes on TextField in SwiftUI?
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问题描述
我有一个简单的 TextField,它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)
我想在每次这个字段改变时调用一个函数,就像这样:
I want to call a function each time this field changes, something like this:
TextField("Search Location", text: $location) {
self.autocomplete(location)
}
然而这行不通.我知道有回调 onEditingChanged - 但是这似乎只有在聚焦该字段时才会触发.
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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