Shows detailed source “About” page when adding 3rd-party sources

Allows users to preview sources before adding them to their AltStore.

AltStore/Sources/SourceDetailViewController.swift

@@ -0,0 +1,108 @@
+//
+//  SourceDetailViewController.swift
+//  AltStore
+//
+//  Created by Riley Testut on 3/15/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+import AltStoreCore
+import Roxas
+
+import Nuke
+
+class SourceDetailViewController: HeaderContentViewController<SourceHeaderView, SourceDetailContentViewController>
+{
+    @Managed private(set) var source: Source
+    
+    private var addButton: VibrantButton!
+    
+    private var previousBounds: CGRect?
+    
+    init?(source: Source, coder: NSCoder)
+    {
+        self.source = source
+        super.init(coder: coder)
+        
+        self.title = source.name
+        self.tintColor = source.effectiveTintColor
+    }
+    
+    required init?(coder: NSCoder)
+    {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func viewDidLoad()
+    {
+        super.viewDidLoad()
+        
+        self.addButton = VibrantButton(type: .system)
+        self.addButton.title = NSLocalizedString("ADD", comment: "")
+        self.addButton.contentInsets = PillButton.contentInsets
+        self.addButton.sizeToFit()
+        self.view.addSubview(self.addButton)
+        
+        Nuke.loadImage(with: self.source.effectiveIconURL, into: self.navigationBarIconView)
+        Nuke.loadImage(with: self.source.effectiveHeaderImageURL, into: self.backgroundImageView)
+        
+        self.update()
+    }
+    
+    override func viewDidLayoutSubviews()
+    {
+        super.viewDidLayoutSubviews()
+        
+        self.addButton.layer.cornerRadius = self.addButton.bounds.midY
+        self.navigationBarIconView.layer.cornerRadius = self.navigationBarIconView.bounds.midY
+        
+        var addButtonSize = self.addButton.sizeThatFits(CGSize(width: Double.infinity, height: .infinity))
+        addButtonSize.width = max(addButtonSize.width, PillButton.minimumSize.width)
+        addButtonSize.height = max(addButtonSize.height, PillButton.minimumSize.height)
+        self.addButton.frame.size = addButtonSize
+        
+        // Place in top-right corner.
+        let inset = 15.0
+        self.addButton.center.y = self.backButton.center.y
+        self.addButton.frame.origin.x = self.view.bounds.width - inset - self.addButton.bounds.width
+        
+        guard self.view.bounds != self.previousBounds else { return }
+        self.previousBounds = self.view.bounds
+        
+        let headerSize = self.headerView.systemLayoutSizeFitting(CGSize(width: self.view.bounds.width - inset * 2, height: UIView.layoutFittingCompressedSize.height))
+        self.headerView.frame.size.height = headerSize.height
+    }
+    
+    //MARK: Override
+    
+    override func makeContentViewController() -> SourceDetailContentViewController
+    {
+        guard let storyboard = self.storyboard else { fatalError("SourceDetailViewController must be initialized via UIStoryboard.") }
+        
+        let contentViewController = storyboard.instantiateViewController(identifier: "sourceDetailContentViewController") { coder in
+            SourceDetailContentViewController(source: self.source, coder: coder)
+        }
+        return contentViewController
+    }
+    
+    override func makeHeaderView() -> SourceHeaderView
+    {
+        let sourceAboutView = SourceHeaderView(frame: CGRect(x: 0, y: 0, width: 375, height: 200))
+        sourceAboutView.configure(for: self.source)
+        return sourceAboutView
+    }
+    
+    override func update()
+    {
+        super.update()
+        
+        if self.source.identifier == Source.altStoreIdentifier
+        {
+            // Users can't remove default AltStore source, so hide buttons.
+            self.addButton.isHidden = true
+            self.navigationBarButton.isHidden = true
+        }
+    }
+}