Hi Jose, thanks for providing your solution. I’m too busy with my work today, and I’ll give a try tomorrow and let you know how it goes. Thanks again.

Thank you gchiste, I'll give a try.

Thanks @gchiste, it works as I expected after adding extension. Looks so good, thanks again.

Thank you so much @gchiste, I copied you code snippet to a new file and there was an error says “trackingState doesn’t have description”. However, it has debugDescription., and the text view showing a little too much info. Anyway, thanks for helping me out.

I tried UIImage and CGImage, neither one of them works

Thank you so much