Implemented find on page UI

App/Document Controls UI/DocumentControlView.swift

@@ -0,0 +1,87 @@
+//
+//  DocumentControlView.swift
+//  App
+//
+//  Created by James Magahern on 9/30/20.
+//
+
+import UIKit
+
+class DocumentControlView: UIControl
+{
+    static public let controlHeight = CGFloat(48.0)
+    
+    let imageView = UIImageView(frame: .zero)
+    let label = UILabel(frame: .zero)
+    
+    var drawsBottomSeparator: Bool = false {
+        didSet { setNeedsLayout() }
+    }
+    
+    internal let highlightView = UIView(frame: .zero)
+    internal let separatorView = UIView(frame: .zero)
+    
+    init() {
+        super.init(frame: .zero)
+        
+        addSubview(highlightView)
+        addSubview(imageView)
+        addSubview(label)
+        addSubview(separatorView)
+        
+        tintColor = .label
+        
+        label.font = UIFont.preferredFont(forTextStyle: .subheadline)
+        label.textAlignment = .center
+        
+        imageView.contentMode = .center
+        
+        separatorView.backgroundColor = .secondarySystemFill
+        highlightView.backgroundColor = .secondarySystemFill
+        
+        highlightView.isHidden = true
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    override func sizeThatFits(_ size: CGSize) -> CGSize {
+        CGSize(width: size.width, height: Self.controlHeight)
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        highlightView.frame = bounds
+        
+        let padding: CGFloat = 18.0
+        let imageSize: CGFloat = 24.0
+        let bounds = self.bounds.inset(by: layoutMargins)
+        imageView.frame = CGRect(
+            x: bounds.minX, y: 0.0,
+            width: imageSize, height: imageSize
+        ).centeredY(inRect: self.bounds)
+        
+        label.frame = CGRect(
+            x: imageView.frame.maxX + padding, y: bounds.minY,
+            width: bounds.width - imageView.frame.maxX - padding, height: bounds.height
+        )
+        
+        let separatorHeight: CGFloat = 1.0
+        if drawsBottomSeparator {
+            separatorView.isHidden = false
+            separatorView.frame = CGRect(
+                x: self.bounds.minX, y: self.bounds.height - separatorHeight,
+                width: self.bounds.width, height: separatorHeight
+            )
+        } else {
+            separatorView.isHidden = true
+        }
+    }
+    
+    override func setTracking(_ tracking: Bool) {
+        super.setTracking(tracking)
+        highlightView.isHidden = !tracking
+    }
+}