I have some variables that I want to pass to a ContentView.
This is the Data.swift file with the class and function that fetch the variables:
import SwiftUI
class Api {
func getValues() {
let url = URL(string: "URL")
guard let requestUrl = url else { fatalError() }
var request = URLRequest(url: requestUrl)
request.httpMethod = "GET"
request.setValue("User Agent", forHTTPHeaderField: "User-Agent")
request.setValue("Auth", forHTTPHeaderField: "Authorization")
URLSession.shared.dataTask(with: request) { (data, _, _) in
let dataString = String(data: data!, encoding: .utf8)
func convertToDictionary(text: String) -> [String: Any]? {
if let data = text.data(using: .utf8) {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
} catch {
print(error.localizedDescription)
}
}
return nil
}
let dict = convertToDictionary(text: dataString!)
let array = dict!["array1"] as? NSArray
let array0 = array![0] as? NSDictionary
let id = array0!["id"] as! String
let objects = array0!["object"] as! NSDictionary
var total = 0
var i = 0
for object in objects {
let key = object.key as! String
let tmpDict = objects[(key)] as! NSDictionary
let tmpStr = tmpDict["raw_value"] as! String
let tmpD = Double(tmpStr)
let value = Int(tmpD!)
print(value)
total+=value
i+=1
}
print("ID: (id)")
let fractionalProgress = CGFloat(total / i)/6
let roundedProgress = CGFloat(round(100*fractionalProgress)/100)
print("Average value: (roundedProgress)")
}
.resume()
}
}
For the sake of simplicity, I have included a part of the JSON I'm working with below:
{
"array1": [
{
"link_id": 1,
"object": {
"2000000000007522336": {
"is_draft": 0,
"value": "4",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "4.00",
"numerical_value": null
},
"2000000000016619051": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
}
},
"deleted_at": null,
"id": "1_20",
"status_id": 1,
"target_num": 1
},
{
"link_id": 55,
"object": {
"2000000000010046787": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000005323660": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000006311217": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000011929948": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000004856132": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000007455406": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000009846642": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000016910392": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000014735487": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
}
},
"deleted_at": null,
"id": "55_20",
"status_id": 1,
"target_num": 2
},
{
"link_id": 2,
"object": {
"2000000000012123534": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000004686641": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000006918209": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000007310987": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
},
"2000000000013890209": {
"is_draft": 0,
"value": "6",
"show_text": null,
"show_icon_mobile": null,
"raw_value": "6.00",
"numerical_value": null
}
},
"deleted_at": null,
"id": "2_20",
"status_id": 1,
"target_num": 3
}
]
}
Here's the ContentView:
import SwiftUI
struct ContentView: View {
@State var show = false
var body: some View {
Text("Hello, world!")
.onAppear() {
Api().getValues()
}
Text("Values should appear here.")
Circle()
.trim(from: show ? "roundedProgress CGFloat" : 0.99, to: 1)
.stroke(Color.green, style: StrokeStyle(lineWidth: 7.5, lineCap: .round, lineJoin: .round))
.rotationEffect(.degrees(90))
.rotation3DEffect(Angle(degrees: 180), axis: (x: 1, y: 0, z: 0))
.frame(width: 100, height: 100)
.animation(.easeOut)
.onAppear() {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.25) {
self.show.toggle()
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Ideally, I want to trim the ring view based on the roundedProgress float's value and display the values in the text action after the onAppear().
I tried putting the entire function in the onAppear() action but nothing changed. Putting the code without onAppear() shows an error "Failed to produce diagnostic for expression; please file a bug report" on the URLSession action I have for fetching the data.
question from:
https://stackoverflow.com/questions/65847928/pass-variable-from-function-to-view 
