Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 5.3.4
• Cross-platform modules: 5.3.2
• Android Runtime: 5.3.1
• iOS Runtime: 5.3.1

Describe the bug
ActionBar background color animation doesn't work on iOS, neither with CSS animation nor with JS (view.animate()).

The same code works on Android.

To Reproduce

Use this playground.

Tap the "CSS toggle" and "JS toggle" buttons.

Expected behavior

The ActionBar background color should animate on iOS, as it does on Android.

Sample project
Use this playground.

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