How do display event cards when push a button - ios

Question

I'm doing reminder IOS app.How do display event card push a button?
event add view.[Home.swift]
[Home.push plus circle button open this view.]1
event card display on Home.[EventList.swift]
[event cards.this cards do display on Home.swift]2
I tried save tapCount to userDefaults.in EventList.swift get tapCount.Because use ForEach scope.
Home.swift
var tapCount = 0
Button(action: {}) {
tapCount += 1
UserDefaults.standard.set.....
}
EventList.swift
var body: some View {
let tapCount: Int16 = UserDefault.standard.Integer(...) as! Int16
ScrollView(.horizontal, showsIndicators: false) {
HStack {
ForEach(0 ..< tapCount) { item in
EventView()
}
}
}
}
But not to do.please teach it.

Answer 1

My yesterday solution for using UserDefaults.standart in SwiftUI:
made final class UserData with needed variable;
set this variable from UserDefaults at the init();
set #EnvironmentObject var of UserData class at needed View;
some quick example:
import SwiftUI
final class UserData: ObservableObject {
#Published var tapCount: Int? { // remember, it can be nil at the first launch!
didSet {
UserDefaults.standard.set(tapCount, forKey: "tapCount")
}
}
init() {
// Sure you can set it to 0 with UserDefaults.standard.integer(forKey: "tapCount") ?? 0, but be careful with your ForEach loop
self.tapCount = UserDefaults.standard.integer(forKey: "tapCount")
}
}
// how to use:
struct SomeView: View {
#EnvironmentObject var userData: UserDataSettings
var body: some View {
if self.userData.tapCount == nil {
return AnyView(Text("no taps!"))
} else {
return AnyView(ScrollView(.horizontal, showsIndicators: false) {
HStack {
// you need to check for nil, else you app may crash. this if...else variant should work
ForEach(0 ..< userData.tapCount!) { item in
Text("\(item)")
}
}
})
}
}
}
and the last thing: you need to set .environmentObject(UserData()) when display your view (in SceneDelegate for example, if this is the first view) and then bring this userData variable to other child views)