UIViewController autorotate some components?

I have a UIViewController that has an image view and a toolbar. I would开发者_Go百科 like the toolbar to rotate, but the imageview to stay as it is. Is this possible?

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.