How to close a sheet using a closure method? - swiftui

Question

I'm currently developing an application using SwiftUI.
I want to close a sheet after an API connection finish using a closure method.
So I tried to do that with the code below, but in the case of these codes, they don't work well...
How could I solve this problem?
Here are the codes:
TestSheet.swift
import SwiftUI
struct TestSheet: View {
#EnvironmentObject var appState: AppState
#State var id:Int = 1
#State var memo:String = "new Memo"
#State var isFinish:Bool = false
#Environment(\.presentationMode) var presentationMode
var body: some View {
NavigationView{
VStack{
Button(action: {
appState.makeUpDate(
pk:id, memo:memo, finish: {returnData in
isFinish = returnData
}
)
if(isFinish){
self.presentationMode.wrappedValue.dismiss()
}
})
{
Text("UPDATE")
}
}
}
}
}
AppState.swift
...
func makeUpDate(pk the_pk:Int, memo the_memo:String, finish:#escaping(Bool)->Void) {
var isFinish:Bool = false
let endpoint: String = "https://sample.com/api/info/\(the_pk)/"
guard let url = URL(string: endpoint) else {
print("Error: cannot create URL")
return
}
var urlRequest = URLRequest(url: url)
urlRequest.addValue("token xxxxxxxxxx", forHTTPHeaderField: "authorization")
urlRequest.httpMethod = "PUT"
urlRequest.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
let newInfo:[String:Any]=["memo":the_memo]
let jsonInfo: Data
do {
jsonInfo = try JSONSerialization.data(withJSONObject: newInfo, options: [])
urlRequest.httpBody = jsonInfo
} catch {
print("Error: cannot create JSON from newInfo")
return
}
let session = URLSession.shared
let task = session.dataTask(with: urlRequest) {
(data, response, error) in
guard error == nil else {
print("error calling Put")
print(error!)
return
}
guard let responseData = data else {
print("Error: did not receive data")
return
}
guard let response = response as? HTTPURLResponse else {
print("Error: did not response data")
return
}
print("The response code is \(response.statusCode)")
// parse the result as JSON, since that's what the API provides
do {
guard let receivedData = try JSONSerialization.jsonObject(with: responseData,
options: []) as? [String: Any] else {
print("Could not get JSON from responseData as dictionary")
return
}
print("The request is: " + receivedData.description)
} catch {
print("error parsing response from PUT")
return
}
DispatchQueue.main.async {
isFinish = true
finish(isFinish)
}
}
task.resume()
}
...
Xcode:Version 12.0.1

Answer 1

The isFinish is updated asynchronously, so we should react on it in different place
var body: some View {
NavigationView{
VStack{
Button(action: {
appState.makeUpDate(
pk:id, memo:memo, finish: {returnData in
isFinish = returnData
}
)
})
{
Text("UPDATE")
}
}
.onChange(of: isFinish) { result in
if result {
self.presentationMode.wrappedValue.dismiss() // << here !!
}
}
}
}