iOS UIImageView disappears after rotation M_PI_4

Question

What is basically happening here is that I'm adding a custom view to the UIBarButtonItem, and I need to rotate it by 45deg , the rotation works perfectly if rotated by 90deg or 180 , but when it's less that 90 the object gets deformed , and on 45deg the object disappears. Here are the snippets for the button and animation.

UIImageView * menuImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"plus.png"]];
menuButton = [[UIBarButtonItem alloc] initWithCustomView:menuImage];
UITapGestureRecognizer * tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleMenuView:)];
[menuImage addGestureRecognizer:tap1];
[menuImage setUserInteractionEnabled:YES];
[menuImage.layer setShadowColor:[UIColor blackColor].CGColor];
[menuImage.layer setShadowOffset:CGSizeMake(ShadowSizeWidth, ShadowSizeHeight)];
[menuImage.layer setShadowOpacity:ShadowOpacity];
[menuImage.layer setShadowRadius:ShadowRadius];

[self.navigationItem setRightBarButtonItem:menuButton];

The Rotation:

[UIView animateWithDuration:animationRotateButtonDuration delay:0.0f options:UIViewAnimationCurveLinear animations:^{
    CGAffineTransform myTransform = CGAffineTransformMakeRotation(-M_PI_4);

    UIBarButtonItem * currentItem =  menuButton;

    currentItem.customView.transform = myTransform;

}completion:^(BOOL finished){
}];

Answer 1

Use anchorPoint and import "QuartzCore/QuartzCore.h"

currentItem.customView.layer.anchorPoint = CGPointMake(1.0, 0.0);//it is not fixed point you have to change.

I think it will be helpful to you.

Answer 2

If the UIImageView contentMode is set to UIViewContentModeScaleAspectFit or other scaled aspect, the rotation will cause the image to disappear.

Changing the contentMode to UIViewContentModeCenter should fix the problem.