问题
I'm developing an app and I would like one screen to auto-rotate to landscape.
This will be the only rotating screen in the app.
I'm trying to find the easiest way of doing this.
If I set the supported orientations in the build summary page (i.e. with the toggle buttons) so that it is just portrait. Can I then override this in the code for the screen I want to auto-rotate?
Or do I have to do it the other way round? i.e. support all orientations and then disable for all the screens I don't want to rotate?
Thanks
回答1:
Or do I have to do it the other way round? i.e. support all orientations and then disable for all the screens I don't want to rotate?
Yes. You must list for the Info.plist all the orientations you will support. Then limit particular view controller orientations with supportedInterfaceOrientations
. Your one landscape view controller must be presented, i.e. use a "modal" segue or call presentViewController:animated:
.
My answer here may be useful:
https://stackoverflow.com/a/13755923/341994
and my answer here:
https://stackoverflow.com/a/15301322/341994
回答2:
Add an observer to the viewDidLoad method of the view you want to rotate like this :
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter]
addObserver:self selector:@selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:[UIDevice currentDevice]];
and then set the views according the the view you want to change inside the orientationChanged method like this :
- (void) orientationChanged:(NSNotification *)note{
UIDevice * device = [UIDevice currentDevice];
switch(device.orientation)
{
case UIDeviceOrientationPortrait:
break;
case UIDeviceOrientationPortraitUpsideDown:
break;
case UIDeviceOrientationLandscapeLeft:
break;
case UIDeviceOrientationLandscapeRight:
break;
default:
break;
};
}
回答3:
In iOS 6, the app supported orientations (stated in Info.plist
) are AND'ed with the top view controller supported orientations, so in order to accomplish what you want, you need to declare support for every orientation in Info.plist
, and then override the supportedOrientations:
method in the view controllers where you don't want rotation to take place, for example:
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait;
}
来源:https://stackoverflow.com/questions/16376237/do-supported-interface-orientations-have-precedent