iOS：如何更改应用程序中仅一个视图控制器的方向？

Question

I am facing problem in view orientation in my app.

Like

I have two view controller, VC1 and VC2

VC1 have fix landscape orientation. VC2 have both

VC1 -> VC2 is fine. means when I go from VC1 to VC2, VC2 change its orientation in both landscape and portrait.

But when I comeback to VC1 from VC2(where VC2 in portrait mode), VC1 also is in portrait mode but I want VC1 is in landscape only irrespective of VC2 mode.

Please guys help me. Seeking solution from last 2 days. Thanks in advance.

Answer 1

Refer below link for solution

http://swiftiostutorials.com/ios-orientations-landscape-orientation-one-view-controller/

In your VC1..

-(BOOL)shouldAutorotate
{
    return NO;
}

-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskLandscapeLeft;
}

Hope it helps you...

Answer 2

First of all, write this in AppDelegate.m

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
 return (UIInterfaceOrientationMaskAll);
}

Then, For VC1, in which landscape orientation, write this:

- (BOOL)shouldAutorotate
{
 return YES;
}

- (NSUInteger)supportedInterfaceOrientations
{
 return (UIInterfaceOrientationMaskPortrait);
}

For VC2, which have both, change masking to All.

- (NSUInteger)supportedInterfaceOrientations
{
return (UIInterfaceOrientationMaskAllButUpsideDown);
//OR return (UIInterfaceOrientationMaskAll);
}

Answer 3

basically the view-controller-based orientation support in an iOS app is a piece of cake – I did the code in Swift , but ObjC concept would be totally identical to this.

I have created a quick tutorial with UINavigationController but you can convert that to UITabBarController by keeping the concept but updating the environment slightly.

step-1

initially set the orientation support for your app like this:

step-2

create a simple UINavigationController -based storyboard like this:

NOTE: don't worry if it does not say initially OrientaionSupporterController (bonus point if you'd spot the consistent typo here!), I will cover that just in the very next step.

step-3

create a subset of the navigation-controller, like this:

import UIKit

// MARK: - Implementation

class OrientaionSupporterController: UINavigationController {

    // MARK: - Active View Controller

    private var activeViewController: UIViewController? {
        get {
            return self.presentedViewController ?? self.topViewController // for possible modal support
        }
    }

    // MARK: - Orientations

    override var shouldAutorotate: Bool {
        get {
            return self.activeViewController?.shouldAutorotate ?? true // yes, rotate it, please
        }
    }

    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return self.activeViewController?.supportedInterfaceOrientations ?? .all // default is all possible orientations
    }

}

then make sure the that becomes the base class in IB as well:

step-3

create the individual view-controllers with custom orientation support, like eg with only portrait and landscape-left support:

import UIKit

// MARK: - Implementation

class ViewController: UIViewController {

    // MARK: - Orientation

    override var shouldAutorotate: Bool {
        get {
            return true
        }
    }

    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return [.portrait, .landscapeLeft] // no one find that preactical but works flawlessly
    }

}

---

NOTE: you can convert this tutorial anytime with UITabBarController , you just need to (obviously) create a subset of the tab-bar-controller and use the selectedViewController to get the currently visible one.

---

NOTE#2: obviously you can go much further on this way and you can nest the customised navigation-controllers in the view hierarchy, or if you have multiple UIWindow instances in the queue and override the supported orientations there as well for each individual windows (eg some support all four orientations, while some other windows does only landscape for eg video playback, etc...)

Answer 4

1. Enable all orientation support for project.

For VC1 Add this line VC1Controller Class

- (UIInterfaceOrientationMask)supportedInterfaceOrientations { 
  return UIInterfaceOrientationMaskLandscape;
}

For VC2 Add this in VC2Controller Class

- (UIInterfaceOrientationMask)supportedInterfaceOrientations { 
      return UIInterfaceOrientationMaskAll;
    }