[ADD] News, Browse and Settings views ported to SwiftUI

This commit contains WIP SwiftUI versions of most of the views in SideStore.

AltStore/Views/Browse/BrowseView.swift

@@ -0,0 +1,99 @@
+//
+//  BrowseView.swift
+//  SideStoreUI
+//
+//  Created by Fabian Thies on 18.11.22.
+//  Copyright © 2022 Fabian Thies. All rights reserved.
+//
+
+import SwiftUI
+import AltStoreCore
+
+struct BrowseView: View {
+    @SwiftUI.FetchRequest(sortDescriptors: [
+        NSSortDescriptor(keyPath: \StoreApp.sourceIdentifier, ascending: true),
+        NSSortDescriptor(keyPath: \StoreApp.sortIndex, ascending: true),
+        NSSortDescriptor(keyPath: \StoreApp.name, ascending: true),
+        NSSortDescriptor(keyPath: \StoreApp.bundleIdentifier, ascending: true)
+    ]/*, predicate: NSPredicate(format: "%K != %@", #keyPath(StoreApp.bundleIdentifier), StoreApp.altstoreAppID)*/)
+    var apps: FetchedResults<StoreApp>
+    
+    var filteredApps: [StoreApp] {
+        apps.filter { $0.matches(self.searchText) }
+    }
+    
+    @State
+    var selectedStoreApp: StoreApp?
+    
+    @State var searchText = ""
+    
+    @State var isShowingSourcesView = false
+    
+    var body: some View {
+        ScrollView {
+            LazyVStack(spacing: 24) {
+                ForEach(filteredApps, id: \.bundleIdentifier) { app in
+                    NavigationLink {
+                        AppDetailView(storeApp: app)
+                    } label: {
+                        BrowseAppPreviewView(storeApp: app)
+                    }
+                    .buttonStyle(PlainButtonStyle())
+                }
+            }
+            .padding()
+            .searchable(text: self.$searchText, placeholder: "Search")
+        }
+        .background(Color(UIColor.systemGroupedBackground).ignoresSafeArea())
+        .navigationTitle("Browse")
+        .toolbar {
+            ToolbarItem(placement: .navigationBarTrailing) {
+                SwiftUI.Button {
+                    self.isShowingSourcesView = true
+                } label: {
+                    Text("Sources")
+                }
+                .sheet(isPresented: self.$isShowingSourcesView) {
+                    NavigationView {
+                        SourcesView()
+                    }
+                }
+            }
+        }
+    }
+}
+
+struct BrowseView_Previews: PreviewProvider {
+    static var previews: some View {
+        BrowseView()
+    }
+}
+
+
+extension StoreApp {
+    func matches(_ searchText: String) -> Bool {
+        searchText.isEmpty ||
+        self.name.lowercased().contains(searchText.lowercased()) ||
+        self.developerName.lowercased().contains(searchText.lowercased())
+    }
+}
+
+extension View {
+    
+    @ViewBuilder func `if`<Content: View>(_ condition: Bool, transform: (Self) -> Content) -> some View {
+        if condition {
+            transform(self)
+        } else {
+            self
+        }
+    }
+    
+    
+    @ViewBuilder func searchable(text: Binding<String>, placeholder: String) -> some View {
+        if #available(iOS 15.0, *) {
+            self.searchable(text: text, prompt: Text(placeholder))
+        } else {
+            self
+        }
+    }
+}