Finish Kotlin implementation of IosCanvas

ios/Application/Platform/ComponentView.swift

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2016-2019 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * Loop Habit Tracker is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import UIKit
+
+class ComponentView : UIView {
+    var component: Component?
+    
+    init(frame: CGRect, component: Component?) {
+        self.component = component
+        super.init(frame: frame)
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        fatalError()
+    }
+    
+    override func draw(_ rect: CGRect) {
+        let canvas = IosCanvas(width: Double(rect.width),
+                               height: Double(rect.height),
+                               scale: 1.0)
+        component?.draw(canvas: canvas)
+    }
+    
+    override func layoutSubviews() {
+        setNeedsDisplay()
+    }
+}