可选字符串数组作为绑定参数SwiftUI[重复]

Question

如何拥有绑定类型的可选参数

@Binding var counter:Int
@Binding var strings:[String]


init(counter:Binding<Int>, strings:Binding<[String]>? ) {
    self._counter = counter
    self._strings = strings ?? Binding.constant([String]())
}


// creating a new view as follows throws an error
MyView(counter: $counter)

我得到的错误是：

调用中缺少参数“字符串”的参数




Answer 1

我发现了以下有效的解决方案:

init(counter:Binding<Int>, strings:Binding<[String]> = Binding.constant([String]())) {
    self._counter = counter
    self._strings = strings
}