UIViewController autorotate some components? - iphone

Question

I have a UIViewController that has an image view and a toolbar. I would like the toolbar to rotate, but the imageview to stay as it is. Is this possible?

Answer 1

Yes this is possible, but requires manual handling of rotate events.
In viewDidLoad, add
// store the current orientation
currentOrientation = UIInterfaceOrientationPortrait;
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector: #selector(receivedRotate:) name: UIDeviceOrientationDidChangeNotification object: nil];
if(currentOrientation != self.interfaceOrientation) {
[self deviceInterfaceOrientationChanged:self.interfaceOrientation];
}
and don't forget to deregister events when the controller is removed.
Then add a method for rotates:
// This method is called by NSNotificationCenter when the device is rotated.
-(void) receivedRotate: (NSNotification*) notification
{
NSLog(#"receivedRotate");
UIDeviceOrientation interfaceOrientation = [[UIDevice currentDevice] orientation];
if(interfaceOrientation != UIDeviceOrientationUnknown) {
[self deviceInterfaceOrientationChanged:interfaceOrientation];
} else {
NSLog(#"Unknown device orientation");
}
}
and finally the rotate method
- (void)deviceInterfaceOrientationChanged:(UIInterfaceOrientation)interfaceOrientation {
if(interfaceOrientation == currentOrientation) {
NSLog(#"Do not rotate to current orientation: %i", interfaceOrientation);
} else if(interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) {
NSLog(#"Do not rotate to UIInterfaceOrientationPortraitUpsideDown");
} else if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
NSLog(#"Do not rotate to UIInterfaceOrientationLandscapeLeft");
} else {
if(!isRotating)
{
isRotating = YES;
if(currentOrientation == UIInterfaceOrientationPortrait && interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
NSLog(#"Rotate to landscape");
// rotate to right top corner
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
// do your rotation here
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(animationDoneShowCaption:finished:context:)];
[UIView commitAnimations];
} else if(currentOrientation == UIInterfaceOrientationLandscapeRight && interfaceOrientation == UIInterfaceOrientationPortrait) {
// etc
}
isRotating = NO;
} else {
NSLog(#"We are already rotating..");
}
}
currentOrientation = interfaceOrientation;
}
Note that I do not allow for rotates in some directions, you might.
In addition, you need to make your components resizable / able to rotate.
Edit Consider using block-based animations instead and set the isRotation = NO in the completion block.