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New iOS 8 APIs don't allow you to use a custom presentation controller for compact devices, in conjunction with a popover on "normal" size class devices
//
// ViewController.m
// PopoverPresentationControllerExample
//
// Created by Bryan Irace on 8/8/14.
// Copyright (c) 2014 Bryan Irace. All rights reserved.
//
#import "CustomCompactPresentationController.h"
#import "ViewController.h"
#import "ModalViewController.h"
@interface ViewController () <UIViewControllerTransitioningDelegate, UIPopoverPresentationControllerDelegate>
@end
@implementation ViewController
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
/**
This modal view controller should be displayed in a popover on normal size class devices, but should use a custom
presentation controller on devices with a compact size class.
I don't know how to accomplish this, though, since `UIPopoverPresentationControllerDelegate`'s
`adaptivePresentationStyleForPresentationController` method doesn't allow you to return `UIModalPresentationCustom`.
One way would be to:
1) Use `UIModalPresentationCustom` instead of `UIModalPresentationPopover`
2) Subclass `UIPopoverPresentationController`, implement this behavior myself, and return an instance of my subclass
from `presentationControllerForPresentedViewController:presentingViewController:sourceViewController`
instead of accessing `modal.popoverPresentationController` at all
But since popover presentation controllers are not intended to be instantiated directly, it feels like I'm fighting
the framework here.
*/
ModalViewController *modal = [[ModalViewController alloc] init];
modal.modalPresentationStyle = UIModalPresentationPopover;
modal.transitioningDelegate = self;
modal.popoverPresentationController.sourceView = self.view;
modal.popoverPresentationController.sourceRect = CGRectZero;
modal.popoverPresentationController.delegate = self;
[self presentViewController:modal animated:YES completion:nil];
}
#pragma mark - UIPopoverPresentationControllerDelegate
- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {
/**
The documentation says this can only return `UIModalPresentationFullScreen` or `UIModalPresentationOverFullScreen`,
or none.
It would be great if returning `UIModalPresentationCustom` here would allow the presenting view controller's
transitioning delegate to provide a custom presentation controller instance.
*/
return UIModalPresentationCustom;
}
#pragma mark - UIViewControllerTransitioningDelegate
- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented
presentingViewController:(UIViewController *)presenting
sourceViewController:(UIViewController *)source {
/**
This method is never called, because the view controller being presented has modal presentation style
`UIModalPresentationPopover` instead of `UIModalPresentationCustom`.
If this method were called, I could provide a custom presentation controller for usage on compact size class
devices where popovers are not supported.
*/
return [[CustomCompactPresentationController alloc] init];
}
@end
@malhal

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commented Mar 4, 2016

UIModalPresentationCustom means you want to use a custom presentation controller. It doesn't make sense in this case to try to adapt to a a different controller when you already are using the popover presentation controller! There is only one ever one presentation controller. The popover controller has a delegate method you can use to easily adapt the views to or create new ones for display in full screen for compact devices.

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