image rotation, covers the button - objective-c

Question

I want to rotate the image around the x-axis from left to right. The problem is that when you rotate the image covers the button located on the top
Run animation
[AnimationUtil rotationRightToLeftForView:image andDuration:1];
Animation metod
+(void) rotationRightToLeftForView:(UIView *)flipView andDuration:(NSTimeInterval)duration{
// Remove existing animations before stating new animation
[flipView.layer removeAllAnimations];
// Make sure view is visible
flipView.hidden = NO;
// show 1/2 animation
//flipView.layer.doubleSided = NO;
// disable the view so it’s not doing anythign while animating
flipView.userInteractionEnabled = NO;
// Set the CALayer anchorPoint to the left edge and
// translate the button to account for the new
// anchorPoint. In case you want to reuse the animation
// for this button, we only do the translation and
// anchor point setting once.
if (flipView.layer.anchorPoint.x != 0.0f) {
flipView.layer.anchorPoint = CGPointMake(0.0f, 0.5f);
flipView.center = CGPointMake(flipView.center.x-flipView.bounds.size.width/2.0f, flipView.center.y);
}
// create an animation to hold the page turning
CABasicAnimation *transformAnimation = [CABasicAnimation animationWithKeyPath:#"transform"];
transformAnimation.removedOnCompletion = NO;
transformAnimation.duration = duration;
transformAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
// start the animation from the current state
transformAnimation.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
// this is the basic rotation by 180 degree along the y-axis M_PI
CATransform3D endTransform = CATransform3DMakeRotation(radians(180.0), 0.0f, -1.0f, 0.0f);
transformAnimation.toValue = [NSValue valueWithCATransform3D:endTransform];
// Create an animation group to hold the rotation
CAAnimationGroup *theGroup = [CAAnimationGroup animation];
// Set self as the delegate to receive notification when the animation finishes
theGroup.delegate = self;
theGroup.duration = duration;
// CAAnimation-objects support arbitrary Key-Value pairs, we add the UIView tag
// to identify the animation later when it finishes
[theGroup setValue:[NSNumber numberWithInt:flipView.tag] forKey:#"viewFlipTag"];
// Here you could add other animations to the array
theGroup.animations = [NSArray arrayWithObjects:transformAnimation, nil];
theGroup.removedOnCompletion = NO;
// Add the animation group to the layer
[flipView.layer addAnimation:theGroup forKey:#"flipView"];
}

Answer 1

The decision follows:
Create mask (image) Color = black, make region Size = Button.size Color = transparent
image name = "mask2.png"
button = ...;
ImageView = ...;
parent_view = ...;
UIImage *_maskingImage = [UIImage imageNamed:#"mask2"];
CALayer *_maskingLayer = [CALayer layer];
_maskingLayer.frame = parent_View.bounds;
[_maskingLayer setContents:(id)[_maskingImage CGImage]];
CALayer *layerForImage = [[CALayer alloc] init];
layerForImage.frame = parent_View.bounds;
[layerForImage setMask:_maskingLayer];
[layerForImage addSublayer:ImageView.layer];
[parent_View.layer addSublayer:layerForImage];
[parent_View addSubView:button];