Dactyloidae iOS initial commit

mobile/ios/Client/Frontend/Widgets/InnerStrokedView.swift

@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import UIKit
+
+/// A transparent view with a rectangular border with rounded corners, stroked
+/// with a semi-transparent white border.
+class InnerStrokedView: UIView {
+    var color = UIColor.white.withAlphaComponent(0.2) {
+        didSet {
+            setNeedsDisplay()
+        }
+    }
+
+    var strokeWidth: CGFloat = 1.0 {
+        didSet {
+            setNeedsDisplay()
+        }
+    }
+
+    var cornerRadius: CGFloat = 4 {
+        didSet {
+            setNeedsDisplay()
+        }
+    }
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        backgroundColor = UIColor.clear
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func draw(_ rect: CGRect) {
+        let halfWidth = strokeWidth / 2 as CGFloat
+
+        let path = UIBezierPath(roundedRect: CGRect(x: halfWidth,
+            y: halfWidth,
+            width: rect.width - strokeWidth,
+            height: rect.height - strokeWidth),
+            cornerRadius: cornerRadius)
+        color.setStroke()
+        path.lineWidth = strokeWidth
+        path.stroke()
+    }
+}