Rotating screen in ios10

Question

Just sometimes

After upgrading to swift3.0 and upgrading ios10, when I enter the desired horizontal screen 'viewController', sometimes this result appears:

Before using this normally, this should be correct:

I don’t know if this is a mistake, or I need to make some changes

this is the "swift" code:

override var shouldAutorotate : Bool {
return true }

override var supportedInterfaceOrientations : UIInterfaceOrientationMask   {
return .landscape }

override var preferredInterfaceOrientationForPresentation : UIInterfaceOrientation {
return .landscapeLeft }