swift - 如何使用 stateobject 作为参数初始化 View ？

Question

struct ProfileEditView: View {
@ObservedObject var viewModel: UsersViewModel
@StateObject var auth: Authenticator

@State var showingImageEditor: Bool = false

init(_ viewModel: UsersViewModel, _ auth: Authenticator) {
    
    self.viewModel = viewModel
    self.auth = auth
    
    UITableView.appearance().backgroundColor = UIColor.clear
    UITableViewCell.appearance().selectionStyle = .none
}

var body: some View { }}

我正在尝试手动初始化一个带有 StateObject 的 View 作为参数。我收到一个错误: Cannot assign to property: 'auth' is a get-only property .编写初始化程序的正确方法是什么？

Answer 1

如果没有您对 Authenticator 的定义，我将无法完全重现您的代码和 UsersViewModel ，但我让它编译:

class UsersViewModel: ObservableObject {}
class Authenticator: ObservableObject {}

struct ProfileEditView: View {
    @ObservedObject var viewModel: UsersViewModel
    @StateObject var auth: Authenticator

    @State var showingImageEditor: Bool = false

    init(_ viewModel: ObservedObject<UsersViewModel>, _ auth: Authenticator) {

        _viewModel = viewModel
        _auth = StateObject(wrappedValue: auth)

        UITableView.appearance().backgroundColor = UIColor.clear
        UITableViewCell.appearance().selectionStyle = .none
    }

    var body: some View {
        Text("something")
    }
}

这些是关键的变化:

init(_ viewModel: ObservedObject<UsersViewModel>, _ auth: Authenticator) {
    _viewModel = viewModel
    _auth = StateObject(wrappedValue: auth)

如果你不明白我的变化，你应该谷歌

"swift property wrappers"

以更好地了解什么是属性包装器以及如何使用它们。