Swiftui - TextField with optional observedObject

Question

这里我有一个读取ObservedObject的文本字段的视图。观察对象有一个名为"用户"的属性。可选类型为"NewUser?"。当我试图打开&;newuser &;我得到一个错误，说我仍然必须打开它。

的错误

分类列出模型

struct NewUser: {
var id: UUID?
var username: String
}

观察对象

class HTTPUserClient: ObservableObject {

@Published var user: NewUser? //a user struct with a non optional 
//function and stuff ommitted
}

<<h3>视图/h3>

import SwiftUI
struct TestUserEditor: View {
@ObservedObject var userClient:HTTPUserClient

var body: some View {
TextField("required", text: $userClient.user!.username)   
} 
}    

的错误如果我使用上面的代码，我得到以下错误

Value of optional type 'NewUser?' must be unwrapped to refer to member 'firstName' of wrapped base type 'NewUser'

但是如果我通过添加"!"来修复它，强制展开用户，我得到相同的错误

Answer 1

我的建议是通过添加静态example作为占位符来摆脱可选。

struct NewUser {
var id: UUID?
var username: String
static let example = NewUser(id: nil, username: "")
}

并声明user

@Published var user = NewUser.example