Getting Values from own PickerView - swift

Question

I'm new to Swift and I'm currently developing my own Timer Application for practice purposes. (I do it without storyboard)
Now I have the Problem that i made a View called "TimePickerView" (Code below), where I created my own Picker. Then I use that TimePickerView in another part of my Application with other Views (in a View). In that View I want to pick my time but I don't know how i can get the Values of the Picker (The Picker works by the way)
This is my TimePickerView
import SwiftUI
struct TimePickerView: View {
#State private var selectedTimeIndexSecond = 0
#State private var selectedTimeIndexMinutes = 0
#State private var seconds : [Int] = Array(0...59)
#State private var minutes : [Int] = Array(0...59)
var body: some View {
VStack{
Text("Select Your Time")
HStack{
//minutes-Picker
Picker("select time", selection: $selectedTimeIndexMinutes, content: {
ForEach(0..<minutes.count, content: {
index in
Text("\(minutes[index]) min").tag(index)
})
})
.padding()
.frame(width: 120)
.clipped()
//seconds-Picker
Picker("select time", selection: $selectedTimeIndexSecond, content: {
ForEach(0..<seconds.count, content: {
index in
Text("\(seconds[index]) sec").tag(index)
})
})
.padding()
.frame(width: 120)
.clipped()
Spacer()
}
Text("You picked the time")
.multilineTextAlignment(.center)
.font(.title2)
.padding()
Text("\(minutes[selectedTimeIndexMinutes]) min : \(seconds[selectedTimeIndexSecond]) sec")
.font(.title)
.bold()
.padding(.top, -14.0)
}
}
func getValues() -> (Int, Int) {
return (self.minutes[selectedTimeIndexMinutes] ,self.seconds[selectedTimeIndexSecond])
}
}
and that is the View I want to use my Picker, but I don't know how I get those values from the Picker:
struct SetTimerView: View {
#State var timepicker = TimePickerView()
var body: some View {
NavigationView{
VStack{
//Select the time
timepicker
//Timer variables (This doesn't work)
var timerTime = timepicker.getValues()
var minutes = timerTime.0
var seconds = timerTime.1
Spacer()
let valid : Bool = isValid(timerTime: minutes+seconds)
//Confirm the time
NavigationLink(
destination:
getRightView(
validBool: valid,
timerTime: minutes*60 + seconds),
label: {
ConfirmButtonView(buttonText: "Confirm")
});
Spacer()
}
}
}
func isValid(timerTime : Int) -> Bool {
if (timerTime == 0) {
return false
} else {
return true
}
}
#ViewBuilder func getRightView(validBool : Bool, timerTime : Int) -> some View{
if (validBool == true) {
TimerView(userTime: CGFloat(timerTime), name: "David", isActive: true)
} else {
UnvalidTimeView()
}
}
}

Answer 1

I think main problem is misunderstanding conceptions between data and views.
At first you need a model witch will override your data (create it in separate swift file):
import Foundation
class Time: ObservableObject {
#Published var selectedTimeIndexMinutes: Int = 0
#Published var selectedTimeIndexSecond: Int = 0
}
Pay attention on ObservableObject so that swiftUI can easily detect changes to it that trigger any active views to redraw.
Next I try to change the value of the model in the view
import SwiftUI
struct TimePickerView: View {
#EnvironmentObject var timeData: Time
#State private var seconds : [Int] = Array(0...59)
#State private var minutes : [Int] = Array(0...59)
var body: some View {
VStack{
Text("Select Your Time")
HStack{
//minutes-Picker
Picker("select time", selection: $timeData.selectedTimeIndexMinutes, content: {
ForEach(0..<minutes.count, content: {
index in
Text("\(minutes[index]) min").tag(index)
})
})
.padding()
.frame(width: 120)
.clipped()
//seconds-Picker
Picker("select time", selection: $timeData.selectedTimeIndexSecond, content: {
ForEach(0..<seconds.count, content: {
index in
Text("\(seconds[index]) sec").tag(index)
})
})
.padding()
.frame(width: 120)
.clipped()
Spacer()
}
Text("You picked the time")
.multilineTextAlignment(.center)
.font(.title2)
.padding()
Text("\(timeData.selectedTimeIndexMinutes) min : \(timeData.selectedTimeIndexSecond) sec")
.font(.title)
.bold()
.padding(.top, -14.0)
}
}
}
struct TimePickerView_Previews: PreviewProvider {
static var previews: some View {
TimePickerView()
.environmentObject(Time())
}
}
Like you can see I don't using #Blinding, instead of it I connecting our Model with a View
On the next view I can see changes, I created a new one because your example have view that don't indicated here...
import SwiftUI
struct ReuseDataFromPicker: View {
#EnvironmentObject var timeData: Time
var body: some View {
VStack{
Text("You selected")
Text("\(timeData.selectedTimeIndexMinutes) min and \(timeData.selectedTimeIndexSecond) sec")
}
}
}
struct ReuseDataFromPicker_Previews: PreviewProvider {
static var previews: some View {
ReuseDataFromPicker()
.environmentObject(Time())
}
}
And collect all in a Content View
struct ContentView: View {
var body: some View {
TabView {
TimePickerView()
.tabItem {Label("Set Timer", systemImage: "clock.arrow.2.circlepath")}
ReuseDataFromPicker()
.tabItem {Label("Show Timer", systemImage: "hourglass")}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
.environmentObject(Time())
}
}
Like that you can easily change or reuse your data on any other views