I'm trying to rotate a UIImageView within a circular mask (which is set with myImageView.layer.mask). The problem is that any time I attempt to rotate said UIImageView, the mask rotates with it. Here is some code.
Setting up the mask:
UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(0, - 169)
radius:191
startAngle:0.0
endAngle:2*M_PI
clockwise:YES];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
[shapeLayer setFrame:myImageView.bounds];
[shapeLayer setPath:[path CGPath]];
myImageView.layer.mask = shapeLayer;
Animation:
[UIView animateWithDuration:kRotationTime animations:^(void){
myImageView.transform = CGAffineTransformMakeRotation(angle);
}];
And that's basically all there is to it. A UIImageView rotating about its own center within a fixed-position circular mask--that's the desired effect. Perhaps there is another way to structure the view hierarchy so that myImageView and the mask are siblings, but I haven't had luck going that route.
Put the image view into an additional plain UIView superview. Set the layer mask on the superview. Animate the image view.