orientation in ios ipad - ios

Question

I have an Ipad application which support in "landscape" mode now i want this to support for both "landscape and portrait" this project is made with "xib" files
i used some delegates but i did not get solution what i have to do
i use this code
- (void)viewWillTransitionToSize:(CGSize)size
withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
//The device has already rotated, that's why this method is being called.
UIInterfaceOrientation toOrientation = [[UIDevice currentDevice] orientation];
//fixes orientation mismatch (between UIDeviceOrientation and UIInterfaceOrientation)
if (toOrientation == UIInterfaceOrientationLandscapeRight) toOrientation = UIInterfaceOrientationLandscapeLeft;
else if (toOrientation == UIInterfaceOrientationLandscapeLeft) toOrientation = UIInterfaceOrientationLandscapeRight;
UIInterfaceOrientation fromOrientation = [[UIApplication sharedApplication] statusBarOrientation];
[self willRotateToInterfaceOrientation:toOrientation duration:0.0];
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
[self willAnimateRotationToInterfaceOrientation:toOrientation duration:[context transitionDuration]];
} completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
[self didRotateFromInterfaceOrientation:fromOrientation];
}];
}
-(void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
NSLog(#"Transition");
}

Answer 1

You should add UISupportedInterfaceOrientation key with list of orientations (you can make it with xCode UI in the target's General settings).
Also, if you need different orientations on different view controllers, you can override method
- (NSUInteger)supportedInterfaceOrientations
And you should read this adaptive interface, because in ios 8, orientation changing means resizing of view.

Answer 2

Below is an example of how to track the screen size initially and with orientation changes in Swift on iOS 8.
I would drop the trait collection delegate method, if you're just beginning. Programmatically working with constraints and transitions at that level is very involved and tricky. Some of it is evolving and/or not well documented, and things happen with constraint transitions behind the scenes that are difficult to figure out. You probably don't need to mess with things like that for awhile.
If you have to adjust constraint programmatically at all, to start, in general it is easier to do the layout in Interface builder, with constraints, and reduce the problem to making minor adjustments to the fewest number of constraints possible from the code, where you access the specific constraints via IBOutlet, and modify their .constant property (rather than remove/replace constraints, which is very difficult to get right).
If you're just getting started at this point in the iOS history, I think Swift is a better way to go than Objective C ( I've done plenty of Objective C programming) Swift is the future with Apple, and has some nice powerful features while getting around some problems and challenges in Objective C. And it offers many conveniences.
override func viewWillAppear(animated: Bool) {
adjustViewLayout(UIScreen.mainScreen().bounds.size)
}
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
adjustViewLayout(size)
}
func adjustViewLayout(size: CGSize) {
var width = CGSize.width
var height = CGSize.height
/* this method will be called when the view is
about to appear and whenever the orientation
changes. Adjust what you need to here based
on the incoming width and height
you can infer whether the screen is in
landscape or portrait by which dimension
is larger. Or use a switch statement
to check for specific screen sizes
and orientations. Though it may
be incomplete knowledge of layout or
a failure of design if you need to do that */
}