#uipopoverpresentationcontroller

UIPopoverPresentationController and UISearchController

UIPresentationController is the presentation management class that backs view controllers presentation. From the time a view controller is presented until the time it is dismissed, UIKit uses a presentation controller to manage various aspects of the presentation process for that view controller. The presentation controller can add its own animations on top of those provided by animator objects, respond to size changes, and manage other aspects of how the view controller is presented onscreen.

By David Lashkhi

Starting from iOS 8 Apple presented new UIPopoverPresentationController instead of UIPopoverController. A few days ago I had to implemented one in iPhone app, so I opened the Apple’s documentation and here’s what we see:

As we see there’s clearly said that we should configure presentationcontroller after presenting it.

Incorrect implementation 

But this is not correct if you want the popup to be presented in a small view, like on iPad. To do this, you need first to set your controller as UIPopoverPresentationControllerDelegate and implement

 -(UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller { 

 return UIModalPresentationNone;

 } 

After this we init view controller we want to be presented:

UIViewController *cityAlertViewController = [[UIViewController alloc] init]; DLpopupView *popupView = [[DLpopupView alloc] initWithFrame:CGRectMake(0.0, 0.0, [300, 91) andRestorationName:@“DCpopupView”]; 

 cityAlertViewController.view = popupView; 

 cityAlertViewController.modalPresentationStyle = UIModalPresentationPopover; 

 cityAlertViewController.preferredContentSize = CGSizeMake(300, 91); 

Now, if we follow Apple’s documentation, we need first to present the cityAlertViewController and then make all the preparation for UIPopoverPresentationController:

 [self presentViewController:cityAlertViewController animated:YES completion:nil]; 

 UIPopoverPresentationController *cityErrorPopover = cityAlertViewController.popoverPresentationController; cityErrorPopover.delegate = self; cityErrorPopover.sourceView = self.view; cityErrorPopover.sourceRect = button.frame; cityErrorPopover.permittedArrowDirections = UIPopoverArrowDirectionUp; cityErrorPopover.backgroundColor = greenNormal;

But as I said before, this doesn’t work on iPhone. Presenting view controller before the preparations returns a full screen presentation instead of classic popup. 

How to fix it? 

The solution is simple— just present view controller after all the preparations are done:

 //Prepare the controller you want to be displayed UIViewController *cityAlertViewController = [[UIViewController alloc] init]; DLpopupView *popupView = [[DLpopupView alloc] initWithFrame:CGRectMake(0.0, 0.0, [300, 91) andRestorationName:@“DCpopupView”]; cityAlertViewController.view = popupView; cityAlertViewController.modalPresentationStyle = UIModalPresentationPopover; cityAlertViewController.preferredContentSize = CGSizeMake(300, 91); 

//configure UIPopoverPresentationController UIPopoverPresentationController *cityErrorPopover = cityAlertViewController.popoverPresentationController; cityErrorPopover.delegate = self; 

 cityErrorPopover.sourceView = self.view;

cityErrorPopover.sourceRect = button.frame; cityErrorPopover.permittedArrowDirections = UIPopoverArrowDirectionUp; cityErrorPopover.backgroundColor = greenNormal;