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

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

AltStore/Components/VibrantButton.swift

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+//
+//  VibrantButton.swift
+//  AltStore
+//
+//  Created by Riley Testut on 3/22/23.
+//  Copyright © 2023 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+private let preferredFont = UIFont.boldSystemFont(ofSize: 14)
+
+class VibrantButton: UIButton
+{
+    var title: String? {
+        didSet {
+            if #available(iOS 15, *)
+            {
+                self.configuration?.title = self.title
+            }
+            else
+            {
+                self.setTitle(self.title, for: .normal)
+            }
+        }
+    }
+    
+    var image: UIImage? {
+        didSet {
+            if #available(iOS 15, *)
+            {
+                self.configuration?.image = self.image
+            }
+            else
+            {
+                self.setImage(self.image, for: .normal)
+            }
+        }
+    }
+    
+    var contentInsets: NSDirectionalEdgeInsets = .zero {
+        didSet {
+            if #available(iOS 15, *)
+            {
+                self.configuration?.contentInsets = self.contentInsets
+            }
+            else
+            {
+                self.contentEdgeInsets = UIEdgeInsets(top: self.contentInsets.top, left: self.contentInsets.leading, bottom: self.contentInsets.bottom, right: self.contentInsets.trailing)
+            }
+        }
+    }
+    
+    override var isIndicatingActivity: Bool {
+        didSet {
+            guard #available(iOS 15, *) else { return }
+            self.updateConfiguration()
+        }
+    }
+    
+    private let vibrancyView = UIVisualEffectView(effect: nil)
+    
+    override init(frame: CGRect)
+    {
+        super.init(frame: frame)
+        
+        self.initialize()
+    }
+    
+    required init?(coder: NSCoder)
+    {
+        super.init(coder: coder)
+        
+        self.initialize()
+    }
+    
+    private func initialize()
+    {
+        let blurEffect = UIBlurEffect(style: .systemThinMaterial)
+        let vibrancyEffect = UIVibrancyEffect(blurEffect: blurEffect, style: .fill) // .fill is more vibrant than .secondaryLabel
+        
+        if #available(iOS 15, *)
+        {
+            var backgroundConfig = UIBackgroundConfiguration.clear()
+            backgroundConfig.visualEffect = blurEffect
+
+            var config = UIButton.Configuration.plain()
+            config.cornerStyle = .capsule
+            config.background = backgroundConfig
+            config.titleTextAttributesTransformer = UIConfigurationTextAttributesTransformer { [weak self] (attributes) in
+                var attributes = attributes
+                attributes.font = preferredFont
+                
+                if let self, self.isIndicatingActivity
+                {
+                    // Hide title when indicating activity, but without changing intrinsicContentSize.
+                    attributes.foregroundColor = UIColor.clear
+                }
+                
+                return attributes
+            }
+            
+            self.configuration = config
+        }
+        else
+        {
+            self.clipsToBounds = true
+            self.contentInsets = NSDirectionalEdgeInsets(top: 8, leading: 8, bottom: 8, trailing: 8) // Add padding.
+            
+            let blurView = UIVisualEffectView(effect: blurEffect)
+            blurView.isUserInteractionEnabled = false
+            self.addSubview(blurView, pinningEdgesWith: .zero)
+            self.insertSubview(blurView, at: 0)
+        }
+        
+        self.vibrancyView.effect = vibrancyEffect
+        self.vibrancyView.isUserInteractionEnabled = false
+        self.addSubview(self.vibrancyView, pinningEdgesWith: .zero)
+    }
+    
+    override func layoutSubviews()
+    {
+        super.layoutSubviews()
+        
+        self.layer.cornerRadius = self.bounds.midY
+                
+        // Make sure content subviews are inside self.vibrancyView.contentView.
+        
+        if let titleLabel = self.titleLabel, titleLabel.superview != self.vibrancyView.contentView
+        {
+            self.vibrancyView.contentView.addSubview(titleLabel)
+        }
+       
+        if let imageView = self.imageView, imageView.superview != self.vibrancyView.contentView
+        {
+            self.vibrancyView.contentView.addSubview(imageView)
+        }
+        
+        if self.activityIndicatorView.superview != self.vibrancyView.contentView
+        {
+            self.vibrancyView.contentView.addSubview(self.activityIndicatorView)
+        }
+        
+        if #unavailable(iOS 15)
+        {
+            // Update font after init because the original titleLabel is replaced.
+            self.titleLabel?.font = preferredFont
+        }
+    }
+}