ラベル swiftUI の投稿を表示しています。 すべての投稿を表示
ラベル swiftUI の投稿を表示しています。 すべての投稿を表示

2020年4月22日水曜日

SwiftUI data visualization, ploting library

One of useful  plot library for SwiftUI

https://github.com/KanshuYokoo/SwiftUIGraphPlotLibrary
It is very nice library to plot data on SwiftUI project ad seem to work on both iOS and MacOSX



2020年1月10日金曜日

EnvironmentObject Swift

EnvironmentObject in Swiftaccording to apple's Document A dynamic view property that uses a bindable object supplied by an ancestor view to invalidate the current view whenever the bindable object changes.

Declaration

@frozen @propertyWrapper struct EnvironmentObject<ObjectTypewhere ObjectType : ObservableObject

what does that mean ?


my understanding is that variable wrapped @EnvironmentObject can be shared 
across all views and update view when the variable is updated.
This is like the way React/Redux store doing.
final class UserData: ObservableObject  {
    @Published var showFavoritesOnly = false
    @Published var landmarks = landmarkData
}
struct LandmarkList: View {

    @EnvironmentObject var userData: UserData

    var body: some View {
        NavigationView{
            List {
                Toggle(isOn: $userData.showFavoritesOnly  , label: {Text("Favorites only")})
                ForEach(userData.landmarks) { landdata in
                    if (!self.userData.showFavoritesOnly || landdata.isFavorite) {
                        NavigationLink(destination: ContentView(landmark:   landdata)) {
                            LandmarkRow(landmark: landdata)
                            }.navigationBarTitle(Text("Landmark"))
                        }
                    }
                }
        }
    }
}