On iOS 13 Beta 5, I currently have problems with my UISplitView on iPhones.
My app starts with the detailsview off my splitview not with my masterview (look at the p
I had the same issue.
After a bit of investigation it seems like viewDidLoad is too late to set it to all visible.
viewDidLoad
I subclassed the UISplitViewController and changed the setting in awakeFromNib method. Now it is working as expected.
UISplitViewController
awakeFromNib