how to lock portrait orientation for only main view using swift

Question

I have created an application for iPhone, using swift, that is composed from many views embedded in a navigation controller. I would like to lock the main v

Answer 1

You do have to apply this to your top view controller. However, you can do it in a clean/easy way by subclassing your top view controller and setting a variable within it that to references every time you make a call to:

shouldAutoRotate()

which is called when the device detects an orientation change and precedes the call to:

supportedInterfaceOrientations()//this is only called if shouldAutoRotate() returns true

For example, say my top view controller is a TabBarController:

class SomeSubclassTabBarViewController: UITabBarController { //This subclass allows us to pass along data to each of the tabBars

var dataArray = StoredValues()//also useful for passing info between tabs
var shouldRotate: Bool = false


override func shouldAutorotate() -> Bool { //allow the subviews accessing the tabBarController to set whether they should rotate or not
    return self.shouldRotate
}

}

Then within the view which should have the ability to rotate the screen, set the viewWillAppear() and viewWillDisappear() like so:

override func viewWillAppear(animated: Bool) { //set the rotate capability to true
    let sharedTabBarController = self.tabBarController as SomeSubclassTabBarViewController
    sharedTabBarController.shouldRotate = true
}

override func viewWillDisappear(animated: Bool) {
    let sharedTabBarController = self.tabBarController as SomeSubclassTabBarViewController
    sharedTabBarController.shouldRotate = false
}

and just in case your app crashes while on this screen, it's probably a good idea to explicitly set the shouldRotate: Bool value on each of your views within the viewWillLoad() method.

Answer 2

Here is the Swift Update :-

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    return UIInterfaceOrientationMask.Portrait
}

Answer 3

If your iOS application is in Landscape mode only and You want to use camera in landscape mode of application then please try for below solution.

Step 1:

In your appdelegate.m class

-(UIInterfaceOrientationMask)application:(UIApplication *)application
supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone){
        NSString *captionVal = [TMUtils getValueInUserDefault:@"CAPTION"];
        if ([captionVal isEqualToString:@"Camera"]) {
            return UIInterfaceOrientationMaskPortrait;
        }else{
            return UIInterfaceOrientationMaskLandscapeRight;
        }
    }else{
        return UIInterfaceOrientationMaskAllButUpsideDown;
    }
}

Here you can take shared preference value CAPTION as keyValue pair and store the value "Camera".

Step 2: Now in your viewController.m class in camera button Action set shared preference value and open new ViewController which will be having camera functionality.

[TMUtils setValueInUserDefault:@"CAPTION" value:@"Camera"];

Step 3: In Camera functionality viewController.m class set storyboard with UIImageView and back button.

Now in ViewDidLoad of camera functionality viewController.m set

- (void)viewDidLoad {
    [super viewDidLoad];

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            NSLog(@"Error");
        } else {

            UIImagePickerController *pickerController = [[UIImagePickerController alloc] init];
            pickerController.modalPresentationStyle = UIModalPresentationCurrentContext; //this will allow the picker to be presented in landscape
            pickerController.delegate = self;
            pickerController.allowsEditing = YES;
            pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
            [self presentViewController:pickerController animated:YES completion:nil];
        }
}

Now in UIImagePickerController delegate method set image to UIImageView

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

        UIImage *chosenImage = info[UIImagePickerControllerOriginalImage];
        self.cameraImage.image = chosenImage;
        [picker dismissViewControllerAnimated:YES completion:NULL];
}

Now on camera back UIButton

- (IBAction)cameraBtnAction:(id)sender {
    [TMUtils setValueInUserDefault:@"CAPTION" value:@"NOCamera"];
    [self dismissViewControllerAnimated:YES completion:nil];
}

It will always check according to shared preference value in delegate class function for supportedInterfaceOrientationsForWindow in reference to that value it allow camera functionality ViewController to open camera in Portrait mode and rest it will again go back to Landscape mode, which will completely work fine.

Answer 4

Also answered [here]

Things can get quite messy when you have a complicated view hierarchy, like having multiple navigation controllers and/or tab view controllers.

This implementation puts it on the individual view controllers to set when they would like to lock orientations, instead of relying on the App Delegate to find them by iterating through subviews or relying on inheritance.

Swift 3

In AppDelegate:

/// set orientations you want to be allowed in this property by default
var orientationLock = UIInterfaceOrientationMask.all

func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
        return self.orientationLock
}

In some other global struct or helper class, here I created AppUtility:

struct AppUtility {

    static func lockOrientation(_ orientation: UIInterfaceOrientationMask) {

        if let delegate = UIApplication.shared.delegate as? AppDelegate {
            delegate.orientationLock = orientation
        }
    }

    /// OPTIONAL Added method to adjust lock and rotate to the desired orientation
    static func lockOrientation(_ orientation: UIInterfaceOrientationMask, andRotateTo rotateOrientation:UIInterfaceOrientation) {

        self.lockOrientation(orientation)

        UIDevice.current.setValue(rotateOrientation.rawValue, forKey: "orientation")
    }

}

Then in the desired ViewController you want to lock orientations:

 override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    AppUtility.lockOrientation(.portrait)
    // Or to rotate and lock
    // AppUtility.lockOrientation(.portrait, andRotateTo: .portrait)

}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    // Don't forget to reset when view is being removed
    AppUtility.lockOrientation(.all)
}