fix(ios): Color.fromIosColor returns wrong value (#10059)

apps/automated/src/color/color-tests.android.ts

@@ -0,0 +1 @@
+export * from './color-tests-common';

apps/automated/src/color/color-tests.d.ts

@@ -0,0 +1,2 @@
+import * as android from './color-tests.android';
+import * as iOS from './color-tests.ios';

apps/automated/src/color/color-tests.ios.ts

@@ -0,0 +1,20 @@
+// >> color-require
+import * as colorModule from '@nativescript/core/color';
+const { Color } = colorModule;
+// << color-require
+import * as TKUnit from '../tk-unit';
+
+export * from './color-tests-common';
+
+export function testFromIosColorWhite () {
+	// >> color-ios-white
+	// Creates the white color
+	const color = Color.fromIosColor(UIColor.whiteColor);
+	// << color-ios-white
+	TKUnit.assertEqual(color.a, 255, 'Color.a not properly parsed');
+	TKUnit.assertEqual(color.r, 255, 'Color.r not properly parsed');
+	TKUnit.assertEqual(color.g, 255, 'Color.g not properly parsed');
+	TKUnit.assertEqual(color.b, 255, 'Color.b not properly parsed');
+	TKUnit.assertEqual(color.hex, '#FFFFFF', 'Color.hex not properly parsed');
+	TKUnit.assertEqual(color.argb, 0xffffffff, 'Color.argb not properly parsed');
+};

packages/core/color/index.ios.ts

@@ -13,8 +13,11 @@ export class Color extends common.Color {
 	}
 
 	public static fromIosColor(value: UIColor): Color {
-		const rgba = CGColorGetComponents(value.CGColor);
+		const r = new interop.Reference<number>();
-
+		const g = new interop.Reference<number>();
-		return new Color(Math.round(rgba[3] * 255), Math.round(rgba[0] * 255), Math.round(rgba[1] * 255), Math.round(rgba[2] * 255));
+		const b = new interop.Reference<number>();
+		const a = new interop.Reference<number>();
+		value.getRedGreenBlueAlpha(r, g, b, a);
+		return new Color(Math.round(a.value * 255), Math.round(r.value * 255), Math.round(g.value * 255), Math.round(b.value * 255));
 	}
 }