[AltStore] Adds redesigned BrowseViewController to browse and install apps

AltStore/Components/ProgressButton.swift

@@ -0,0 +1,63 @@
+//
+//  ProgressButton.swift
+//  AltStore
+//
+//  Created by Riley Testut on 7/15/19.
+//  Copyright © 2019 Riley Testut. All rights reserved.
+//
+
+import UIKit
+
+class ProgressButton: UIButton
+{
+    var progress: Progress? {
+        didSet {
+            self.progressView.progress = Float(self.progress?.fractionCompleted ?? 0)
+            self.progressView.observedProgress = self.progress
+        }
+    }
+    
+    var progressTintColor: UIColor? {
+        get {
+            return self.progressView.progressTintColor
+        }
+        set {
+            self.progressView.progressTintColor = newValue
+        }
+    }
+    
+    private let progressView = UIProgressView(progressViewStyle: .default)
+    
+    override var intrinsicContentSize: CGSize {
+        var size = super.intrinsicContentSize
+        size.width += 32
+        size.height += 4
+        return size
+    }
+    
+    override func awakeFromNib()
+    {
+        super.awakeFromNib()
+        
+        self.layer.masksToBounds = true
+        
+        self.progressView.progress = 0
+        self.progressView.trackImage = UIImage()
+        self.progressView.isUserInteractionEnabled = false
+        self.addSubview(self.progressView)
+    }
+    
+    override func layoutSubviews()
+    {
+        super.layoutSubviews()
+        
+        self.progressView.bounds.size.width = self.bounds.width
+        
+        let scale = self.bounds.height / self.progressView.bounds.height
+        
+        self.progressView.transform = CGAffineTransform.identity.scaledBy(x: 1, y: scale)
+        self.progressView.center = CGPoint(x: self.bounds.midX, y: self.bounds.midY)
+        
+        self.layer.cornerRadius = self.bounds.midY
+    }
+}