如何使用SwiftUI和Combine观察TextField值? [英] How to observe a TextField value with SwiftUI and Combine?

问题描述

每次尝试更改 textField 的值时，我都试图执行一个动作.

I'm trying to execute an action every time a textField's value is changed.

@Published var value: String = ""

var body: some View {            
     $value.sink { (val) in
        print(val)
     }
     return TextField($value)       
}

但是我遇到了错误.

无法将类型为已发布"的值转换为预期的参数类型绑定"

Cannot convert value of type 'Published' to expected argument type 'Binding'

推荐答案

这应该是一种非脆弱的方法:

This should be a non-fragile way of doing it:

class MyData: ObservableObject {
    var value: String = "" {
        willSet(newValue) {
            print(newValue)
        }
    }
}

struct ContentView: View {
    @ObservedObject var data = MyData()
    var body: some View {
        TextField("Input:", text: $data.value)
    }
}

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