小弟我做了一個與php互動的view，
目前做法如下

流程為：
step1:點擊button
step2:傳送參數parameters至ViewModel
step3:ViewModel與php互動獲得回傳值(true/false)並指定給isrepeat
step4:此時view中的isrepeat則變為step3所得到的值

假設php回傳值皆為true
目前遇到的問題是，點擊第一次button時會獲得false，第二次會變成true
有沒有方法能讓第一次點擊時就變成true呢?

在View中，利用button發送parameters給ViewModel
php回傳json格式的數組獲得 true/false 值，並且指定給isrepeat這個變數
ViewModel.swift

class ViewModel: ObservableObject{
    @Published var isrepeat = Bool()
    @Published var items = [PostModel]()
    let prefixUrl = "****"
    // MARK: - check test for repeat data
    func check(parameters:[String: Any]){
        guard let url = URL(string: "\(prefixUrl)/check_test_repeat.php") else{
            print("Not found url")
            return
        }
        let data = try! JSONSerialization.data(withJSONObject: parameters)
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.httpBody = data
        request.setValue("application", forHTTPHeaderField: "Content-Type")
        URLSession.shared.dataTask(with: request){(data,res,error) in
            if error != nil{
                print("error", error?.localizedDescription ?? "")
                return
            }
            do{
                if let data = data{
                    let result = try JSONDecoder().decode(check_test.self, from: data)
                    DispatchQueue.main.asyncAfter(deadline: .now()+1){
                        self.isrepeat = result.isrepeat // 指定給isrepeat
                    }
                } else {
                    print("No data")
                }
            } catch let JsonError{
                print("fetch json error:", JsonError.localizedDescription)
            }
        }.resume()
    }
    
    
}

view.swift

struct reservationviewText1: View {
    @EnvironmentObject var RV: RV_information
    @EnvironmentObject var viewModel: ViewModel
 ...
 ...
 ...
var body: some View {
    VStack{
    ...
    ...
   Button(action: {
      let parameters: [String: Any] = ["STime": datetoSting(Time: RV.STime), "ETime": datetoSting(Time: RV.ETime)] // 傳入參數
       self.viewModel.check(parameters: parameters) //執行model
       print(self.viewModel.isrepeat)}){
               HStack{
                  Image(systemName: "scribble.variable")
                                .font(/*@START_MENU_TOKEN@*/.title/*@END_MENU_TOKEN@*/)
                            Text("check out")
                                .fontWeight(.semibold)
                                .font(/*@START_MENU_TOKEN@*/.title/*@END_MENU_TOKEN@*/)
                        }
                    }
   
   
           
    }
}
        

php回傳格式如下

{"isrepeat":true}