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Moving a modally represented UIViewController up when a keyboard appears on an iPad with iOS8

I have a UIViewController inside a UINavigationController presented on an iPad with iOS8. I use

self.myNavController.modalPresentationStyle = UIModalPresentationFormSheet;

In my view controller, I have a text box. Due to the design of the user interface of the view controller, when the user enters the text box and the keyboard appears, I need to move the view controller to the screen. On iOS7, I animated the change

 self.myNavController.view.superview.frame.origin

to move the view controller up and back. It works well.

However, on iOS8, this no longer works. In fact, oddly enough, the behavior of the view manager shifts slightly down and then backs up (all when I assign self.myNavController.view.superview.frame.origin CGPoint with a smaller estimated Y coordinate).

I originally worked on the suggestion given in this SO question Resize ModalViewController and center it in iOS 7

And I recently tried the suggestion given in Moving the dialog up when the keyboard is working, except when the ipad is deployed , but little can be done. In fact, with the idea of ​​converting in a response, I can at least make the view controller move in the right direction (i.e., Up), but it does not stay there. He is quickly returning.

Ideas?

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We will, I am pretty drowning now. I get it. This can be solved with the new iOS8 UIPresentationController. I will give some code examples below. And try linking the zip work project file later.

The first view controller is the root view controller of the sample application. The code for ChangeFrameTransitioningDelegate is below. A "dialog" is simply an empty controller class.

 // // ViewController.m // TestPresentationController // // Created by Christopher Prince on 9/21/14. // Copyright (c) 2014 Spastic Muffin, LLC. Use at your own discretion. // #import "ViewController.h" #import "ChangeFrameTransitioningDelegate.h" #import "Dialog.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. } - (void) viewDidAppear:(BOOL)animated; { [super viewDidAppear:animated]; ChangeFrameTransitioningDelegate *td = [ChangeFrameTransitioningDelegate new]; td.viewControllerFrame = CGRectMake(100, 0, 100, 100); Dialog *d = [Dialog new]; // Just to make the VC stand out. d.view.backgroundColor = [UIColor greenColor]; // Need to make this custom in order to have the presentationControllerForPresentedViewController method of the transitioning delegate called. d.modalPresentationStyle = UIModalPresentationCustom; d.modalTransitionStyle = UIModalTransitionStyleCoverVertical; d.transitioningDelegate = td; [self presentViewController:d animated:YES completion:^{ // Any time after the view controller is presented you can change the // viewControllerFrame property to change the size and/or position of the // presented view controller. [UIView animateWithDuration:0.5 animations:^{ td.viewControllerFrame = CGRectMake(100, 800, 100, 100); }]; }]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end 
 // // ChangeFrameTransitioningDelegate.h // TestPresentationController // // Created by Christopher Prince on 9/21/14. // Copyright (c) 2014 Spastic Muffin, LLC. Use at your own discretion. // // For iOS8 and later, use this to change the size/position of a view controller after it has been presented. See TextPresentationController example. #import <Foundation/Foundation.h> #import <UIKit/UIKit.h> @interface ChangeFrameTransitioningDelegate : NSObject<UIViewControllerTransitioningDelegate> // This is the size and position that the PresentationController used by this class will use when its frameOfPresentedViewInContainerView method is called. So, this is the size and position that your view controller will have. @property (nonatomic) CGRect viewControllerFrame; @end 
 // // ChangeFrameTransitioningDelegate.m // TestPresentationController // // Created by Christopher Prince on 9/21/14. // Copyright (c) 2014 Spastic Muffin, LLC. Use at your own discretion. // // Some help from http://stackoverflow.com/questions/25903412/editing-bounds-of-uiview-when-presenting-hides-keyboard-in-ios-8 // http://stackoverflow.com/questions/25811199/ios-8-change-the-size-of-presented-modal-view-controller // Some code from https://developer.apple.com/devcenter/download.action?path=/wwdc_2014/wwdc_2014_sample_code/lookinsidepresentationcontrollersadaptivityandcustomanimatorobjects.zip (though, beware, this example doesn't work straight out of the box). // And see http://stackoverflow.com/questions/25957343/moving-a-modally-presented-uiviewcontroller-up-when-keyboard-appears-on-ipad-wit #ifndef SPASLogDetail #define SPASLogDetail NSLog #endif #import "ChangeFrameTransitioningDelegate.h" @interface PresentationController : UIPresentationController { UIView *_dimmingView; } // This is the size and position that the PresentationController will use when its frameOfPresentedViewInContainerView method is called. @property (nonatomic) CGRect currentFrame; @end @implementation PresentationController - (instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController; { self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController]; // Some random default size. self.currentFrame = CGRectMake(0, 0, 100, 100); [self prepareDimmingView]; return self; } // 4/22/15; Added, for rotation. - (void) viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator; { CGSize increasedSize = size; // 4/22/15; I'm getting some odd effects: In a rotation transition from landscape to portrait, the RHS goes white momentarily, and from portrait to landscape, the bottom goes white momentarily. A hack, but increase the size of the dimming view to get around this. increasedSize.width *= 1.5; increasedSize.height *= 1.5; _dimmingView.frameSize = increasedSize; // There appears to be no transitionCoordinator available for this "transition". Therefore using the regular UIView animation, below. /* if([self.presentedViewController transitionCoordinator]) { [[self.presentedViewController transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) { recenterViewController(); } completion:nil]; } else { recenterViewController(); }*/ // 4/23/15; See [1]. Given that I've turned off resizing with the autoresizingMask, this has messed up the repositioning of the (x, y) coordinate of the presentedViewController. Make up for that here. [UIView animateWithDuration: coordinator.transitionDuration animations:^{ // I'm assuming the size here refers to the entire window. CGPoint center = CGPointMake(size.width/2.0, size.height/2.0); self.presentedViewController.view.center = center; } completion:nil]; } - (void)presentationTransitionWillBegin { UIView* containerView = [self containerView]; // 4/23/15; So, this seems to be related to my modal view resizing problem. When I disable autoresizesSubviews, I stop the resizing during the rotation. HOWEVER, this is at the price of two additional problems: (a) the (x, y) coordinate of the modal stops being changed during the rotation, and (b) the animation of the background (_dimmingView?) starts looking funky during the rotation. WHICH makes sense. The containerView size is the full window. //containerView.autoresizesSubviews = NO; UIViewController* presentedViewController = [self presentedViewController]; // [1] 4/23/15; This is better. The _dimmingView animation is preserved. The (x, y) position of the presentedViewController, however isn't right after the rotation. presentedViewController.view.autoresizingMask = UIViewAutoresizingNone; [_dimmingView setFrame:[containerView bounds]]; [_dimmingView setAlpha:0.0]; [containerView insertSubview:_dimmingView atIndex:0]; void (^setAlpha)() = ^{ [_dimmingView setAlpha:1.0]; }; if([presentedViewController transitionCoordinator]) { [[presentedViewController transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) { setAlpha(); } completion:nil]; } else { setAlpha(); } } - (void)dismissalTransitionWillBegin { void (^resetAlpha)() = ^{ [_dimmingView setAlpha:0.0]; }; if([[self presentedViewController] transitionCoordinator]) { [[[self presentedViewController] transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) { resetAlpha(); } completion:nil]; } else { resetAlpha(); } } - (CGRect)frameOfPresentedViewInContainerView { SPASLogDetail(@"frameOfPresentedViewInContainerView: %@", NSStringFromCGRect(self.currentFrame)); return self.currentFrame; } - (void) setCurrentFrame:(CGRect)currentFrame { _currentFrame = currentFrame; // This is the important part for changing the frame of the presented view controller *after* the view is presented. For some odd reason, its not right to change the frame of the containerView. self.presentedView.frame = currentFrame; } - (void) containerViewWillLayoutSubviews; { SPASLogDetail(@"containerViewWillLayoutSubviews"); } - (void)prepareDimmingView { _dimmingView = [[UIView alloc] init]; [_dimmingView setBackgroundColor:[UIColor colorWithWhite:0.0 alpha:0.4]]; [_dimmingView setAlpha:0.0]; //UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dimmingViewTapped:)]; //[_dimmingView addGestureRecognizer:tap]; } /* - (void)dimmingViewTapped:(UIGestureRecognizer *)gesture { if([gesture state] == UIGestureRecognizerStateRecognized) { [[self presentingViewController] dismissViewControllerAnimated:YES completion:NULL]; } }*/ @end @interface ChangeFrameTransitioningDelegate() @property (nonatomic, strong) PresentationController *presentationController; @end @implementation ChangeFrameTransitioningDelegate - (instancetype) init; { self = [super init]; return self; } - (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source { self.presentationController = [[PresentationController alloc] initWithPresentedViewController:presented presentingViewController:presenting]; self.presentationController.currentFrame = self.viewControllerFrame; return self.presentationController; } - (void) setViewControllerFrame:(CGRect)viewControllerFrame { _viewControllerFrame = viewControllerFrame; self.presentationController.currentFrame = viewControllerFrame; } @end
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Source: https://habr.com/ru/post/1203064/

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