我在名为 WorkoutBuilderView 的结构中有一组“锻炼集”。我的问题是我需要从嵌套在 WorkoutBuilderView 中的结构访问该数组的内容(如下所示)。此结构不需要嵌套在 WorkoutBuilderView 中,但它是首选。我唯一真正需要的是能够从另一个结构编辑 sets 数组。
可能为结构创建一个“inout”类型的参数? (据我所知,这仅适用于方法)
- 需要访问的数组称为集合。
- 需要访问的位置用注释标出//access point
代码:
struct WorkoutBuilderView: View {
@State var sets = [WorkoutSet(id: 0, percentage: -1, repetitions: -1, alteredValue: .max)]
var body: some View {
Background {
Group {
...
if self.sets.count > 0 {
ScrollView {
ForEach(self.sets) { set in
WorkoutSetLayout(index: set.id) //where sets needs to be passed in
}
}
}
...
}
}
}
//this is the struct where the array needs to be accessed
struct BuilderPicker: View {
let name: String
let options: Array<String>
let setIndex: Int
@State var selectedOption = 0
var body: some View {
HStack {
...
}
.onReceive([self.selectedOption].publisher.first()) { (value) in
//change sets here
//access point
print(value)
}
}
}
//layout (sets needs to pass through here too)
struct WorkoutSetLayout: View {
let index: Int
var body: some View {
VStack(alignment: .leading) {
Text("Set \(index + 1)")
...
//the array needs to go into the BuilderPicker where it will be edited
BuilderPicker(name: "Weight % of", options: [AlteredValue.max.rawValue, AlteredValue.weight.rawValue], setIndex: index)
...
}
}
}
//you probably don't need to worry about the Background
struct Background<Content: View>: View {
private var content: Content
init(@ViewBuilder content: @escaping () -> Content) {
self.content = content()
}
var body: some View {
EmptyView()
.frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
.overlay(content)
.padding(.top, 75)
}
}
}
最佳答案
如果我正确理解你的问题,@Binding 就是为了这个目的
1) 将绑定(bind)变量添加到嵌套结构中,如
//layout (sets needs to pass through here too)
struct WorkoutSetLayout: View {
let index: Int
@Binding var data: [WorkoutSet]
...
2) 通过初始化器嵌套在父级中绑定(bind)模型,如
ForEach(self.sets) { set in
WorkoutSetLayout(index: set.id, data: self.$sets)
}
关于swift - 如何在 Swift 中从另一个结构编辑一个结构中的数组?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58686591/