Rotate UIBarButtonItem - iphone

Question

I want to rotate a UIBarButtonItem.
I have been able to do this with UIButtons using setTransform:CGAffineTransformMakeRotation(…), but UIBarButtonItem does not have this property.
I know the Camera-app does this, so it should be achieveable.
How can I achieve this?
Thanks.

Answer 1

Have you tried using a custom view inside the UIBarButtonItem that you then transform any way you want?

Answer 2

UIBarButtonItem does not extend UIView, so it cannot be transformed directly. You can add the UIBarButtonItem you wish to transform to a UIToolbar, transform the UIToolbar and then add the toolbar as a custom view to another UIBarButtonItem. This item can then be set as a navigation item or added to another UIToolbar. However, if you are using a custom view or image then Emil's approach in the comment above is best.
UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPlay target:self action:#selector(handleForwardItemTouch:)];
UIToolbar *backToolbar = [[[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 44, 44)] autorelease];
[backToolbar setTransform:CGAffineTransformMakeScale(-1, 1)];
UIBarButtonItem *backToolbarItem = [[[UIBarButtonItem alloc] initWithCustomView:backToolbar] autorelease];
self.navigationItem.rightBarButtonItem = backToolbarItem;

Answer 3

You could put a UIButton inside a Bar Button Item, than rotate the UIButton.

Answer 4

I extended UIToolBar, giving access to its subviews, and in it have a function rotate that rotates the buttons in the opposite direction of the bar:
- (void)rotate: (int)degrees{
//for the bar
self.transform=CGAffineTransformMakeRotation(DegreesToRadian(degrees));
//for the subviews (UIBarButtonItems)
for (UIView * subView in self.subviews)
{
if(!CGRectEqualToRect(subView.bounds, self.bounds))
subView.transform = CGAffineTransformMakeRotation(DegreesToRadian(-degrees));
}
}