将肖像方向限制为iOS中的collectionview似乎不起作用

Question

I have multiple viewControllers in my app and I would like to restrict certain views only to portrait orientation. I have achieved this by overriding shouldAutoRotate and supportedInterfaceOrientations like below

    override func shouldAutorotate() -> Bool {
        return false
    }

    override func supportedInterfaceOrientations() -> Int {

        return Int(UIInterfaceOrientation.Portrait.rawValue)
    }

I have followed the same for a UICollectionView but it doesn't seem to work. I would like to know if this is the right way to achieve it. Help on this would be much appreciated. Thanks in advance!

Answer 1

In iOS 8 or later, if you want to control the allowed orientations per view controller:

1. Make sure the "Supported interface orientations" in the Info.plist allows all orientations you want the app to be able to use. (Or just check the correct "Device Orientations" in the Xcode UI interface to the Info.plist file)

2. Per view controller, implement (example restricting to portrait):

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

A problem you can run in to is if your view controller is embedded in another view controller (like an UINavigationController or a UITabBarController, or both).

I suspect this is the situation you are describing.

If so, all view controllers involved need to implement the supportedInterfaceOrientations() method. AFAIK, if you for example have a UINavigationController above your view controller, you need to sub class and create your own navigation controller with the method implemented.