问题描述
openxlsx::write.xlsx(df1,'yourfile.xlsx',keepNA = TRUE)
如您所见，我在列表项中有列表。我想在显示列表项后显示列表。这是这个子列表项：
struct CohortItemView:View {
@State var cohortsGetter: ProfilesInCohort
let cohortItem:CohortArrayItem
@Observedobject var profilesGetter = CohortProcessor()
init(item:CohortArrayItem) {
self.cohortItem = item
self.cohortsGetter = ProfilesInCohort.init(cohortWebId: cohortItem.cohort?.webID ?? "")
}
var body: some View {
vstack{
HStack{
Text(cohortItem.cohort?.name ?? "no data")
.padding(.leading,10)
.multilineTextAlignment(.leading)
Spacer()
ZStack{
Text("Show all \(cohortItem.profilesNum!)")
}.padding(.trailing,10)
}
var usersInCohort { array in
ScrollView(.horizontal,showsIndicators: false) {
HStack{
ForEach(1..<6,id: \.self) {
let user = (array![$0].profile)
UserCard(user: usermodel(name: user.firstName ?? "",position: user.lastName ?? "",image: "moon.stars.fill"))
}
}.padding(10)
}
}
}
}
func usersInCohort(completion:@escaping ([ProfilesInCohortModel.ProfilesArrayItem]?)->Void) {
let params = ["offset":6,"cohortWebID":cohortItem.cohort?.webID ?? ""] as [String : Any]
var request = URLRequest(url: URL(string: "url")!)
request.httpMethod = HTTPMethod.post.rawValue
request.httpBody = try? JSONSerialization.data(withJSONObject: params,options: [])
request.setValue("application/json; charset=UTF-8",forHTTPHeaderField: "Content-Type")
AF.request(request).responseDecodable(of: ProfilesInCohortModel.self) { (response) in
if response.response?.statusCode == 200{
completion(response.value?.profiles)
}
}
}
}
struct UserCard: View {
let user:usermodel
init(user:usermodel) {
self.user = user
}
var body: some View {
vstack{
ZStack(alignment: .topTrailing) {
Image(systemName: user.image)
.resizable()
.frame(width: 64.0,height: 64.0)
.clipShape(Circle())
.shadow(radius: 10)
Button(action: {
print("Edit button was tapped")
}) {
Image(systemName: user.image)
}
}
Text(user.name)
.fontWeight(.regular)
.foregroundColor(.black)
.multilineTextAlignment(.center)
Text(user.position)
.foregroundColor(.gray)
.multilineTextAlignment(.center)
}
.background(Color.green)
}
}
在这一行：
var usersInCohort { array in
ScrollView(.horizontal,image: "moon.stars.fill"))
}
}.padding(10)
}
}
var usersInCohort { array in
我不明白为什么会这样。我也尝试使用观察到的对象，但它也没有帮助我。因此，我想在父列表项中看到列表。也许我做错了？
更新
我的模型：
Closure containing a declaration cannot be used with result builder 'viewbuilder'
和：
struct ProfilesInCohortModel:Decodable {
var num,status:Int?
var noMore,authrequired:Bool?
var profiles:[ProfilesArrayItem]?
enum CodingKeys:String,CodingKey {
case num,status,authrequired,profiles
case noMore = "flagNoMore"
}
struct ProfilesArrayItem:Decodable{
let profile:ProfileItem
let publiclyForwarded:Int
let altCohort:CohortItem
enum CodingKeys:String,CodingKey {
case profile,altCohort
case publiclyForwarded = "followedBySessionUser_publicly"
}
}
struct ProfileItem:Decodable,Identifiable {
let id = UUID()
let inode,superSedByNode,createdUser,editedUser:Int?
let webID,notes,web,wikipedia,suffix,bio,title:String?
let name,akaName,firstName,middleName,lastName,fullName:String?
let twitter,linkedin,instagram,github,email,phone:String?
let createTime,lastEditTime:UInt64?
let hasImage:Bool?
enum CodingKeys:String,CodingKey {
case inode,webID,name,fullName
case notes,twitter,phone
case status,title
case editedUser = "user_lastedit"
case createdUser = "user_created"
case superSedByNode = "superseded_by_node"
case email = "contact_email"
case createTime = "time_created"
case lastEditTime = "time_lastedit"
case hasImage = "has_image"
}
}
}
解决方法
首先，我会将您的异步代码移至视图模型。然后，使用 onAppear 调用异步方法来检索同类群组。然后，您可以对存储在 ForEach 变量中的结果使用 Published：
class CohortRetriever : ObservableObject {
@Published var retrievedCohorts: [ProfilesInCohortModel.ProfilesArrayItem] = []
func retrieve(cohortItem: CohortArrayItem) {
self.usersInCohort(cohortItem: cohortItem) { result in
self.retrievedCohorts = result
}
}
private func usersInCohort(cohortItem: CohortArrayItem,completion:@escaping ([ProfilesInCohortModel.ProfilesArrayItem]?)->Void) {
let params = ["offset":6,"cohortWebID":cohortItem.cohort?.webID ?? ""] as [String : Any]
var request = URLRequest(url: URL(string: "url")!)
request.httpMethod = HTTPMethod.post.rawValue
request.httpBody = try? JSONSerialization.data(withJSONObject: params,options: [])
request.setValue("application/json; charset=UTF-8",forHTTPHeaderField: "Content-Type")
AF.request(request).responseDecodable(of: ProfilesInCohortModel.self) { (response) in
if response.response?.statusCode == 200{
completion(response.value?.profiles)
}
}
}
}
struct CohortItemView:View {
@State var cohortsGetter: ProfilesInCohort
let cohortItem:CohortArrayItem
@ObservedObject var profilesGetter = CohortProcessor()
@StateObject var retriever = CohortRetriever()
init(item:CohortArrayItem) {
self.cohortItem = item
self.cohortsGetter = ProfilesInCohort.init(cohortWebId: cohortItem.cohort?.webID ?? "")
}
var body: some View {
VStack{
HStack{
Text(cohortItem.cohort?.name ?? "no data")
.padding(.leading,10)
.multilineTextAlignment(.leading)
Spacer()
ZStack{
Text("Show all \(cohortItem.profilesNum!)")
}.padding(.trailing,10)
}
ScrollView(.horizontal,showsIndicators: false) {
HStack{
ForEach(retriever.retrievedCohorts) { user in //<-- Here
UserCard(user: UserModel(name: user.firstName ?? "",position: user.lastName ?? "",image: "moon.stars.fill"))
}
}.padding(10)
}
}.onAppear { //<-- Here
self.retriever.retrieve(cohortItem: cohortItem)
}
}
}
请注意，我没有您的所有代码，因此可能存在一些小问题，例如，如果您的模型不符合 Hashable，您可能需要将 id: 传递给 { {1}}。
此外，您可以将 ForEach 重构为 one 函数而无需回调——您可以看到我已经包装了 retrieve。但是，如果您有兴趣，这只是您可以做的繁忙工作。
最后，我不太确定 usersInCohort 在您的代码中做了什么——它被初始化，然后从未使用过。也许那个代码应该和我的想法结合起来。