从 JSON API SwiftUI 中的响应获取值 Xcode
Get value from JSON API response in SwiftUI Xcode
我需要 post 一个 https 请求来登录视图 (SwiftUI)，我的代码遵循 getres.swift：
所以我需要从响应中获取价值并将其放在文本中
import Foundation
import Combine
struct result: Decodable {
let res, ordercount, rate: String
}
class getres: ObservableObject {
let objectWillChange = PassthroughSubject<getres, Never>()
@Published var authenticated = ""
@Published var todos = [result]() {
didSet {
objectWillChange.send(self)
}
}
func auth(username: String, password: String) {
guard let url = URL(string: "http://company.com/auth.php") else { return }
let body: [String: String] = ["username": username, "password": password]
let finalBody = try! JSONSerialization.data(withJSONObject: body)
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = finalBody
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data=data else{return}
let fineldata=try! JSONDecoder().decode(result.self, from: data)
DispatchQueue.main.async {
self.todos = [fineldata]
self.authenticated=fineldata.res
}
print(fineldata)
}.resume()
}
}
并在登录页面中尝试显示其他视图
在这段代码中，我将从函数中获取值作为 json 响应 我将获取订单数和费率 我将其放在另一个视图中
import SwiftUI
struct ContentView: View {
@State private var username: String = ""
@State private var password: String = ""
@ObservedObject var manager = getres()
var body: some View {
VStack(alignment: .leading) {
if manager.authenticated == "2"{
userdetails()
}else{
Text("Username")
TextField("placeholder", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
.autocapitalization(.none)
Text("Password")
SecureField("placeholder", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
Button(action: {
self.manager.auth(username: self.username, password: self.password)
}) {
HStack{
Spacer()
Text("Login")
Spacer()
}
.accentColor(Color.white)
.padding(.vertical, 10)
.background(Color.red)
.cornerRadius(5)
.padding(.horizontal, 40)
}
}.padding()}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
在 userdetails 中，所以我需要从响应中获取值
struct userdetails: View {
@State var controller = getres()
var body : some View{
ScrollView(Axis.Set.vertical, showsIndicators: true) {
VStack(spacing: 20){
Image("wlogo").renderingMode(.original); HStack(spacing: 15){
Spacer()
VStack(alignment: .center, spacing: 10) {
Text(???).foregroundColor(Color.white).bold()
.font(.largeTitle)
Text("")
.foregroundColor(Color.white)
.font(.headline) }
Spacer()
}}}}
如何从响应中获取订单数并输入
文本（？？？）
在查看用户详细信息中
例如 controller.todos.ordercount
我收到这个错误
“[result]”类型的值没有成员 'ordercount'
当我尝试
文字(controller.todos.ordercount)
json 回应
{"res":"2","ordercount":"20","rate":"5"}
更新的答案
1.) 如果您只复制一部分代码会很有帮助 - 这对我们所有人来说都更容易复制
2.) 在手动复制或更改代码中的某些内容之前，您应该自己尝试您的代码。发现这样的错误很烦人：
如果manager.authenticated == "2"{
用户详细信息（）
} 否则{
Text("Username")
TextField("placeholder", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
.autocapitalization(.none)
Text("Password")
SecureField("placeholder", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
Button(action: {
self.manager.auth(username: self.username, password: self.password)
}) {
HStack{
Spacer()
Text("Login")
Spacer()
}
.accentColor(Color.white)
.padding(.vertical, 10)
.background(Color.red)
.cornerRadius(5)
.padding(.horizontal, 40)
}
}.padding()}
}
你在哪里添加 .padding() 到 if 语句....
3.) 你应该以人们可以理解 class if 的方式命名 class 名称，并以大写字母开头，就像 Apple 对所有 class 名称所做的那样
4.) 你还应该开始查看大写的名称（就像 Apple 一样）
5.) 因为我必须访问你的页面而你没有提供示例数据 and/or 密码我不知道那里有什么数据...
到目前为止，这是我的解决方案代码：
我添加了一些假数据，因为我无法访问你的数据....所以你可以看到一些细节。
struct ToDo: Decodable, Identifiable {
var id = UUID().uuidString
let res, ordercount, rate: String
}
class ToDoGetter: ObservableObject {
let objectWillChange = PassthroughSubject<ToDoGetter, Never>()
@Published var authenticated = ""
@Published var todos = [ToDo]() {
didSet {
objectWillChange.send(self)
}
}
let someFakingTodos = [
ToDo(res: "a", ordercount: "5", rate: "75%"),
ToDo(res: "b", ordercount: "52", rate: "5%"),
ToDo(res: "c", ordercount: "566", rate: "7%"),
ToDo(res: "d", ordercount: "53", rate: "33%"),
ToDo(res: "e", ordercount: "15", rate: "44%"),
ToDo(res: "f", ordercount: "345", rate: "10%")
]
func auth(username: String, password: String) {
guard let url = URL(string: "http://company.com/auth.php") else { return }
let body: [String: String] = ["username": username, "password": password]
let finalBody = try! JSONSerialization.data(withJSONObject: body)
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = finalBody
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data=data else{return}
let fineldata=try! JSONDecoder().decode(ToDo.self, from: data)
DispatchQueue.main.async {
self.todos = [fineldata]
self.authenticated=fineldata.res
}
print(fineldata)
}.resume()
}
}
struct ContentView: View {
@EnvironmentObject var todoGetter : ToDoGetter
@State private var username: String = ""
@State private var password: String = ""
@State var navigateToDetail : Bool = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
if todoGetter.authenticated == "2"{
Userdetails().environmentObject(todoGetter)
} else{
Text("Username")
TextField("placeholder", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
.autocapitalization(.none)
Text("Password")
SecureField("placeholder", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
NavigationLink(destination: Userdetails(), isActive: self.$navigateToDetail) {
EmptyView() }
.hidden()
.padding()
Button(action: {
self.todoGetter.auth(username: self.username, password: self.password)
self.navigateToDetail.toggle()
}) {
HStack{
Spacer()
Text("Login")
Spacer()
}
.accentColor(Color.white)
.padding(.vertical, 10)
.background(Color.red)
.cornerRadius(5)
.padding(.horizontal, 40)
}
}
}
}
}
}
struct Userdetails: View {
@EnvironmentObject var todoGetter : ToDoGetter
var body : some View{
VStack(spacing: 20) {
Image("wlogo").renderingMode(.original); HStack(spacing: 15){
Spacer()
List(todoGetter.someFakingTodos) { todo in
VStack(alignment: .center, spacing: 10) {
HStack {
Text(todo.res).foregroundColor(Color.white).bold()
.font(.largeTitle)
Text(todo.ordercount)
.foregroundColor(Color.white)
.font(.headline)
Text(todo.rate)
.foregroundColor(Color.white)
.font(.headline)
}
}.background(Color.black)
Spacer()
}
}
}
}
}
旧答案
你给 getres 打了 2 次电话。您只需调用它一次，然后将值赋给 detailview。
每个应用只能创建一次模型。
我需要 post 一个 https 请求来登录视图 (SwiftUI)，我的代码遵循 getres.swift： 所以我需要从响应中获取价值并将其放在文本中
import Foundation
import Combine
struct result: Decodable {
let res, ordercount, rate: String
}
class getres: ObservableObject {
let objectWillChange = PassthroughSubject<getres, Never>()
@Published var authenticated = ""
@Published var todos = [result]() {
didSet {
objectWillChange.send(self)
}
}
func auth(username: String, password: String) {
guard let url = URL(string: "http://company.com/auth.php") else { return }
let body: [String: String] = ["username": username, "password": password]
let finalBody = try! JSONSerialization.data(withJSONObject: body)
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = finalBody
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data=data else{return}
let fineldata=try! JSONDecoder().decode(result.self, from: data)
DispatchQueue.main.async {
self.todos = [fineldata]
self.authenticated=fineldata.res
}
print(fineldata)
}.resume()
}
}
并在登录页面中尝试显示其他视图
在这段代码中，我将从函数中获取值作为 json 响应 我将获取订单数和费率 我将其放在另一个视图中
import SwiftUI
struct ContentView: View {
@State private var username: String = ""
@State private var password: String = ""
@ObservedObject var manager = getres()
var body: some View {
VStack(alignment: .leading) {
if manager.authenticated == "2"{
userdetails()
}else{
Text("Username")
TextField("placeholder", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
.autocapitalization(.none)
Text("Password")
SecureField("placeholder", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
Button(action: {
self.manager.auth(username: self.username, password: self.password)
}) {
HStack{
Spacer()
Text("Login")
Spacer()
}
.accentColor(Color.white)
.padding(.vertical, 10)
.background(Color.red)
.cornerRadius(5)
.padding(.horizontal, 40)
}
}.padding()}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
在 userdetails 中，所以我需要从响应中获取值
struct userdetails: View {
@State var controller = getres()
var body : some View{
ScrollView(Axis.Set.vertical, showsIndicators: true) {
VStack(spacing: 20){
Image("wlogo").renderingMode(.original); HStack(spacing: 15){
Spacer()
VStack(alignment: .center, spacing: 10) {
Text(???).foregroundColor(Color.white).bold()
.font(.largeTitle)
Text("")
.foregroundColor(Color.white)
.font(.headline) }
Spacer()
}}}}
如何从响应中获取订单数并输入 文本（？？？） 在查看用户详细信息中 例如 controller.todos.ordercount 我收到这个错误 “[result]”类型的值没有成员 'ordercount' 当我尝试 文字(controller.todos.ordercount) json 回应
{"res":"2","ordercount":"20","rate":"5"}
更新的答案
1.) 如果您只复制一部分代码会很有帮助 - 这对我们所有人来说都更容易复制 2.) 在手动复制或更改代码中的某些内容之前，您应该自己尝试您的代码。发现这样的错误很烦人：
如果manager.authenticated == "2"{ 用户详细信息（） } 否则{
Text("Username")
TextField("placeholder", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
.autocapitalization(.none)
Text("Password")
SecureField("placeholder", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
Button(action: {
self.manager.auth(username: self.username, password: self.password)
}) {
HStack{
Spacer()
Text("Login")
Spacer()
}
.accentColor(Color.white)
.padding(.vertical, 10)
.background(Color.red)
.cornerRadius(5)
.padding(.horizontal, 40)
}
}.padding()}
}
你在哪里添加 .padding() 到 if 语句....
3.) 你应该以人们可以理解 class if 的方式命名 class 名称，并以大写字母开头，就像 Apple 对所有 class 名称所做的那样
4.) 你还应该开始查看大写的名称（就像 Apple 一样） 5.) 因为我必须访问你的页面而你没有提供示例数据 and/or 密码我不知道那里有什么数据...
到目前为止，这是我的解决方案代码：
我添加了一些假数据，因为我无法访问你的数据....所以你可以看到一些细节。
struct ToDo: Decodable, Identifiable {
var id = UUID().uuidString
let res, ordercount, rate: String
}
class ToDoGetter: ObservableObject {
let objectWillChange = PassthroughSubject<ToDoGetter, Never>()
@Published var authenticated = ""
@Published var todos = [ToDo]() {
didSet {
objectWillChange.send(self)
}
}
let someFakingTodos = [
ToDo(res: "a", ordercount: "5", rate: "75%"),
ToDo(res: "b", ordercount: "52", rate: "5%"),
ToDo(res: "c", ordercount: "566", rate: "7%"),
ToDo(res: "d", ordercount: "53", rate: "33%"),
ToDo(res: "e", ordercount: "15", rate: "44%"),
ToDo(res: "f", ordercount: "345", rate: "10%")
]
func auth(username: String, password: String) {
guard let url = URL(string: "http://company.com/auth.php") else { return }
let body: [String: String] = ["username": username, "password": password]
let finalBody = try! JSONSerialization.data(withJSONObject: body)
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = finalBody
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
URLSession.shared.dataTask(with: request) { (data, response, error) in
guard let data=data else{return}
let fineldata=try! JSONDecoder().decode(ToDo.self, from: data)
DispatchQueue.main.async {
self.todos = [fineldata]
self.authenticated=fineldata.res
}
print(fineldata)
}.resume()
}
}
struct ContentView: View {
@EnvironmentObject var todoGetter : ToDoGetter
@State private var username: String = ""
@State private var password: String = ""
@State var navigateToDetail : Bool = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
if todoGetter.authenticated == "2"{
Userdetails().environmentObject(todoGetter)
} else{
Text("Username")
TextField("placeholder", text: $username)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
.autocapitalization(.none)
Text("Password")
SecureField("placeholder", text: $password)
.textFieldStyle(RoundedBorderTextFieldStyle())
.border(Color.green)
NavigationLink(destination: Userdetails(), isActive: self.$navigateToDetail) {
EmptyView() }
.hidden()
.padding()
Button(action: {
self.todoGetter.auth(username: self.username, password: self.password)
self.navigateToDetail.toggle()
}) {
HStack{
Spacer()
Text("Login")
Spacer()
}
.accentColor(Color.white)
.padding(.vertical, 10)
.background(Color.red)
.cornerRadius(5)
.padding(.horizontal, 40)
}
}
}
}
}
}
struct Userdetails: View {
@EnvironmentObject var todoGetter : ToDoGetter
var body : some View{
VStack(spacing: 20) {
Image("wlogo").renderingMode(.original); HStack(spacing: 15){
Spacer()
List(todoGetter.someFakingTodos) { todo in
VStack(alignment: .center, spacing: 10) {
HStack {
Text(todo.res).foregroundColor(Color.white).bold()
.font(.largeTitle)
Text(todo.ordercount)
.foregroundColor(Color.white)
.font(.headline)
Text(todo.rate)
.foregroundColor(Color.white)
.font(.headline)
}
}.background(Color.black)
Spacer()
}
}
}
}
}
旧答案
你给 getres 打了 2 次电话。您只需调用它一次，然后将值赋给 detailview。
每个应用只能创建一次模型。