UISplitViewController - Show popover for master view on viewDidLoad

问题

Is it possible to show master view in popover on viewDidLoad (when the view is in portrait orientation)?

回答1:

Solution 1:

[self.popoverButtonItem.target performSelector: self.popoverButtonItem.action withObject: self.popoverButtonItem];

Solution 2:

[self.popoverController presentPopoverFromBarButtonItem:toolbarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:NO];                

But the trick is when to use these statements. I had to use a flag for this purpose, in order to show the popover only once on startup, and only after i have a reference to my popoverController i.e. after split view delegate method calls.

回答2:

With iOS 8.0 the Splitviewcontroller supports a preferredDisplayMode which might be an elegant solution for this use case. From Apple Documentation:

UISplitViewControllerDisplayModePrimaryOverlay
The primary view controller is layered on top of the secondary view controller, leaving the secondary view controller partially vis{ible.

Available in iOS 8.0 and later.

来源：https://stackoverflow.com/questions/6854016/uisplitviewcontroller-show-popover-for-master-view-on-viewdidload