【发布时间】：2020-04-29 18:57:37
【问题描述】：
我正在尝试使用不同的视图编写基本应用程序。在主屏幕上有一个按钮可以打开另一个视图。该视图位于另一个名为 ThoughtsView.swift 的 swift 文件中，其结构为 ThoughtsView()。
我的主视图代码：
struct NewThoughtView: View {
@State var thought = ""
@State var modalIsPresented = false
var body: some View {
NavigationView {
VStack {
Spacer()
TextField("Type your thought...", text: $thought)
Spacer()
Button(action: /*@START_MENU_TOKEN@*/{}/*@END_MENU_TOKEN@*/) {
Text("Ok")
}
Spacer()
Spacer()
// Thought Library Button
Button(action: {self.modalIsPresented = true}) {
Text("Review your thoughts")
}
}
.navigationBarTitle(Text("Skillful"))
}
.actionSheet(isPresented: $modalIsPresented) {
ThoughtsView(thoughtStore: ThoughtStore())
}
}
}
struct NewThoughtView_Previews: PreviewProvider {
static var previews: some View {
NewThoughtView()
}
}
它会抛出以下错误：
无法将“ThoughtsView()”类型的值转换为闭包结果类型“ActionSheet”
这是包含 ThoughtsView 的 swift 文件，我想将它放在新的操作表中：
struct ThoughtsView: View {
var thoughtStore: ThoughtStore
var body: some View {
List(thoughtStore.thoughts, id: \.id) {thought in
Text(thought.thoughtName)
}
}
}
struct ThoughtsView_Previews: PreviewProvider {
static var previews: some View {
ThoughtsView( thoughtStore: ThoughtStore() )
}
}
如果出现错误，sceneDelegate的代码：
import UIKit
import SwiftUI
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo _: UISceneSession, options _: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
// Use a UIHostingController as window root view controller.
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
// Create the SwiftUI view that provides the window contents.
let contentView = NewThoughtView()
window.rootViewController = UIHostingController(rootView: contentView)
self.window = window
window.makeKeyAndVisible()
}
}
func sceneDidDisconnect(_ scene: UIScene) {
// Called as the scene is being released by the system.
// This occurs shortly after the scene enters the background, or when its session is discarded.
// Release any resources associated with this scene that can be re-created the next time the scene connects.
// The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
}
func sceneDidBecomeActive(_ scene: UIScene) {
// Called when the scene has moved from an inactive state to an active state.
// Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
}
func sceneWillResignActive(_ scene: UIScene) {
// Called when the scene will move from an active state to an inactive state.
// This may occur due to temporary interruptions (ex. an incoming phone call).
}
func sceneWillEnterForeground(_ scene: UIScene) {
// Called as the scene transitions from the background to the foreground.
// Use this method to undo the changes made on entering the background.
}
func sceneDidEnterBackground(_ scene: UIScene) {
// Called as the scene transitions from the foreground to the background.
// Use this method to save data, release shared resources, and store enough scene-specific state information
// to restore the scene back to its current state.
}
}
我做错了什么？提前谢谢...
【问题讨论】：
-
你好，你检查我的答案了吗？