stacking multiple images with transparency one above another on iPhone iOS
I'm writing a compass that should rotate a compass image according to CLLocation course. 

On top of that compass I'd like to display an arrow that should point into a different  direction than the compass does. To achieve that I thought I could stack multiple images one upon the other and have them rotate independently. The arrow image should be transparent.

How do I stack these images and rotate them independently?
stacking multiple images with transparency one above another on iPhone iOS
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I'm writing a compass that should rotate a compass image according to CLLocation course. 

On top of that compass I'd like to display an arrow that should point into a different  direction than the compass does. To achieve that I thought I could stack multiple images one upon the other and have them rotate independently. The arrow image should be transparent.

How do I stack these images and rotate them independently?