Objective-c – documented way to set the iPhone orientation

cocoa-touchiphoneobjective c

I have an app where I would like to support device rotation in certain views but other don't particularly make sense in Landscape mode, so as I swapping the views out I would like to force the rotation to be set to portrait.

There is an undocumented property setter on UIDevice that does the trick but obviously generates a compiler warning and could disappear with a future revision of the SDK.

[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationPortrait];

Are there any documented ways to force the orientation?

Update: I thought I would provide an example as I am not looking for shouldAutorotateToInterfaceOrientation as I have already implemented that.

I want my app to support landscape and portrait in View 1 but only portrait in View 2. I have already implemented shouldAutorotateToInterfaceOrientation for all views but if the user is in landscape mode in View 1 and then switches to View 2, I want to force the phone to rotate back to Portrait.

Best Answer

This is long after the fact, but just in case anybody comes along who isn't using a navigation controller and/or doesn't wish to use undocumented methods:

UIViewController *c = [[UIViewController alloc]init];
[self presentModalViewController:c animated:NO];
[self dismissModalViewControllerAnimated:NO];
[c release];

It is sufficient to present and dismiss a vanilla view controller.

Obviously you'll still need to confirm or deny the orientation in your override of shouldAutorotateToInterfaceOrientation. But this will cause shouldAutorotate... to be called again by the system.

Related Solutions

R – Weird landscape UITabBarController Application startup

Try the following. Not sure why it does not work for you

1) set the key UIInterfaceOrientation
to UIInterfaceOrientationLandscapeRight in your .plist file

2) override your UITabBarController shouldAutorotateToInterfaceOrientation() method; in the following the code only deals with tab zero and one, and only with one controller: if you have a navigation controller and you want to control different controllers that may be on the stack, you have to modify the code accordingly

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

    BOOL tabZeroController = [[[self.viewControllers objectAtIndex:0] visibleViewController] isKindOfClass:[YourTabZeroTableViewController class]];

    BOOL tabOneController = [[[self.viewControllers objectAtIndex:1] visibleViewController] isKindOfClass:[YourTabOneTableViewController class]];


    if(self.selectedIndex == 0 && tabZeroController)
        return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);

    if(self.selectedIndex == 1 && tabOneController)
        return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);

    return NO;

}

2) setting

[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];

in your delegate's applicationDidFinishLaunching() method is only required for the simulator, not on a device

3) add the following shouldAutorotateToInterfaceOrientation(method) in your controllers

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{
   return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}

4) run the app on your device and verify that it works properly by using the Hardware menu item Rotate Left and Rotate Right. You should see the display in landscape-mode.

Javascript – How to reset the scale/zoom of a web app on an orientation change on the iPhone

Jeremy Keith (@adactio) has a good solution for this on his blog Orientation and scale

Keep the Markup scalable by not setting a maximum-scale in markup.

<meta name="viewport" content="width=device-width, initial-scale=1">

Then disable scalability with javascript on load until gesturestart when you allow scalability again with this script:

if (navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPad/i)) {
    var viewportmeta = document.querySelector('meta[name="viewport"]');
    if (viewportmeta) {
        viewportmeta.content = 'width=device-width, minimum-scale=1.0, maximum-scale=1.0, initial-scale=1.0';
        document.body.addEventListener('gesturestart', function () {
            viewportmeta.content = 'width=device-width, minimum-scale=0.25, maximum-scale=1.6';
        }, false);
    }
}

Update 22-12-2014:
On an iPad 1 this doesnt work, it fails on the eventlistener. I've found that removing .body fixes that:

document.addEventListener('gesturestart', function() { /* */ });

Best Answer

Related Solutions

R – Weird landscape UITabBarController Application startup

Javascript – How to reset the scale/zoom of a web app on an orientation change on the iPhone

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