In my endless quest to lock the rotation of a AVCaptureVideoPreviewLayer (like in the camera.app), I've decided to try VC containment.
My thought is that if I place AVCaptureVideoPreviewLayer code into a separate VC and disable its rotations, I should be able to have a locked 'view' as my background layer (augmented reality app).
But when I attempt to do this, AVCaptureVideoPreviewLayer simply fails to work at all and I get no camera video.
Below is my setup.
in ViewController.m :
#property (nonatomic, strong, readwrite) cameraViewController *cameraVC;
-(void) viewDidAppear:(BOOL)animated
{
self.cameraVC = [self.storyboard instantiateViewControllerWithIdentifier:#"cameraVC"];
[self addChildViewController:self.cameraVC];
[self.view addSubview:self.cameraVC.view];
in cameraViewController.m :
-(void) viewDidAppear:(BOOL)animated
{
NSLog(#"cameraViewController : viewDidAppear");
self.captureManager = [[CaptureSessionManager alloc] init];
[self.captureManager addVideoInput];
[self.captureManager addVideoPreviewLayer];
CGRect layerRect = self.cameraView.bounds;
[[self.captureManager previewLayer] setBounds:layerRect];
[[self.captureManager previewLayer] setPosition:CGPointMake(CGRectGetMidX(layerRect), CGRectGetMidY(layerRect))];
[self.cameraView.layer addSublayer:self.captureManager.previewLayer];
[[self.captureManager captureSession] startRunning];
}
But when I set cameraViewController.m to be the root controller loaded automatically first in my storyboard, the camera video (AVCaptureVideoPreviewLayer) works fine. (minus the rotation annoyance)
Why does it work as the root VC but not as a child VC?
[I'm using XCode 4.5, iOS 6.0, and storyboards.]
Related
I'm playing around with storyboarding in an OS X 10.10 app. I have an NSTableView that, when you click a specific row opens a segue that goes to a popover that contains an NSViewController.
How do you specify the origin NSPoint of the arrow for the popover? Right now, it just points to the NSTableView in the middle. I assumed that I could do this in prepareForSegue, but I can't seem to figure it out. prepareForSegue doesn't seem to have an understanding that the NSViewController is contained in an NSPopover
Any ideas?
You should file an enhancement request Radar for this behavior if you think it should be provided by the framework in some way.
But to workaround this in the meantime, you can create your own custom NSStoryboardSegue subclass to help with this.
#interface TablePopoverSegue : NSStoryboardSegue
#property (weak) NSTableView *anchorTableView;
#property NSRectEdge preferredEdge;
#property NSPopoverBehavior popoverBehavior;
#end
#implementation TablePopoverSegue
- (void)perform {
if ([self anchorTableView]) {
NSInteger selectedColumn = [[self anchorTableView] selectedColumn];
NSInteger selectedRow = [[self anchorTableView] selectedRow];
// If we can pick a specific row to show from, do that; otherwise just fallback to showing from the tableView
NSView *anchorView = [self anchorTableView];
if (selectedRow >= 0) {
anchorView = [[self anchorTableView] viewAtColumn:selectedColumn row:selectedRow makeIfNecessary:NO];
}
// Use the presentation API so that the popover can be dismissed using -dismissController:.
[[self sourceController] presentViewController:[self destinationController] asPopoverRelativeToRect:[anchorView bounds] ofView:anchorView preferredEdge:[self preferredEdge] behavior:[self popoverBehavior]];
}
}
#end
This can be specified in IB in the inspector panel for the segue (just like iOS):
And then in your source view controller's prepareForSegue:, you can just set up the segue:
- (void)prepareForSegue:(NSStoryboardSegue *)segue sender:(id)sender {
if ([segue isKindOfClass:[TablePopoverSegue class]]) {
TablePopoverSegue *popoverSegue = (TablePopoverSegue *)segue;
popoverSegue.preferredEdge = NSMaxXEdge;
popoverSegue.popoverBehavior = NSPopoverBehaviorTransient;
popoverSegue.anchorTableView = [self tableView];
}
}
I have a laptop that runs OSX 10.8, which is what I have been using to develop an app. I went to test the app on my desktop -- which runs 10.9 -- today and found that everything works the same except one animation.
I have an intro screen and want that to fade out and fade in the next screen; however, the second screen that fades in has an NSTableView on it. On 10.8 the table view fades in correctly with the rest of the view it's in, but in 10.9 when the animation is triggered, the table view appears fully instantly, not animating with the rest of the view.
I've created a small example and attached videos of it running below as well as the code. In the example, the view should be fading from a pure blue view to a view with an NSTableView and a red background. For the sake of simplicity, I just have the animation starting when the app launches, which is why the table view is fully visible upon start of the Mavericks run.
Video of Bug
AppDelegate.m:
#import "AppDelegate.h"
#import "SecondViewController.h"
#import "BlueBGView.h"
#implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
BlueBGView *blueView = [[BlueBGView alloc]initWithFrame:self.window.frame];
SecondViewController *SVC = [[SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
[self.window.contentView addSubview: blueView];
blueView.frame = ((NSView*) self.window.contentView).bounds;
[self.window.contentView addSubview: SVC.view];
//Animate
NSMutableDictionary *blueViewDict, *SVCDict;
blueViewDict = [NSMutableDictionary dictionaryWithCapacity:2];
[blueViewDict setObject:blueView forKey:NSViewAnimationTargetKey];
[blueViewDict setObject:NSViewAnimationFadeOutEffect
forKey:NSViewAnimationEffectKey];
SVCDict = [NSMutableDictionary dictionaryWithCapacity:2];
[SVCDict setObject:SVC.view forKey:NSViewAnimationTargetKey];
[SVCDict setObject:NSViewAnimationFadeInEffect forKey:NSViewAnimationEffectKey];
NSViewAnimation *animation = [[NSViewAnimation alloc]initWithViewAnimations:[NSArray arrayWithObjects:blueViewDict, SVCDict, nil]];
[animation setDuration: 5];
[animation setAnimationCurve:NSAnimationEaseIn];
[animation startAnimation];
}
#end
I have an iPad app, using Storyboards, XCode 4.6 and iOS 6.1. I have a scene that contains a UIViewController. Inside that UIViewController, I have a UIScrollController, all created using IB. Programmatically, in viewDidLoad I created two (2) UIViews (one called subViewGrid, the other called subViewData) and added them to the UIViewController; they both display correctly in the Simulator. Here's the code:
- (void)viewDidLoad {
[super viewDidLoad];
// notify me when calendar has been tapped and CFGregorianDate has been updated
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(calendarTapNotification:)
name:#"calendarDateSelected" object:nil ];
// UIScrollVIew settings
CGSize scrollableSize = CGSizeMake(760, 1379); // set size of scheduleView
[self.schedScrollView setContentSize:scrollableSize];
self.schedScrollView.contentInset = UIEdgeInsetsMake(0,0,44,44); // allow for scroll bar
self.schedScrollView.directionalLockEnabled = YES; // prevents diagonal scrolling
// create a sub-view to hold the appointment GRID
CGRect frame = CGRectMake(0,0,760,1390); // 110,48,760,1390
subViewGrid = [[UIView alloc] initWithFrame:frame];
subViewGrid.tag = 12; // use tag to get correct sub-view
subViewGrid.backgroundColor = [UIColor grayColor];
subViewGrid.alpha = 1.0; // make it opaque
[self.schedScrollView addSubview:subViewGrid];
// create a sub-view to hold the appointment DATA
frame = CGRectMake(110,48,670,750);
subViewData = [[UIView alloc] initWithFrame:frame];
subViewData.tag = 22; // use tag to get correct sub-view
subViewData.backgroundColor = [UIColor redColor];
subViewData.alpha = 0.2; // make it sort of transparent
[self.schedScrollView addSubview:subViewData];
[self.subViewGrid setNeedsDisplay]; // **** UPDATED ****
}
Here is the .h file contents for the UIViewController:
#interface CalendarViewController : UIViewController {
UIView *subViewGrid;
UIView *subViewData;
}
#property (strong, nonatomic) IBOutlet UIScrollView *schedScrollView;
- (void) calendarTapNotification:(NSNotification *) notification;
-(NSDate *)beginningOfDay:(NSDate *)date;
-(NSDate *)endOfDay:(NSDate *)date;
#end
In my drawRect method, I have some code that is supposed to draw a "grid" on the subViewGrid. The problem is drawRect never gets called.`
I have read the UIView Programmer's Guide and looked in SO and did a Google search, but found nothing that addresses the issue, which is: why won't [self.subViewGrid setNeedsDisplay] call drawRect from where I have it placed?
Your view controller needs to call setNeedsDisplay for the view it controls, not for itself. So, you want
[self.subViewGrid setNeedsDisplay]
This is just an error in your reading the documentation. Understanding the documentation is critical for objective-C programming so I'll try to help you get a grasp of it.
If you look at the documentation for setNeedsDisplay you will see that it is either a CALayer or UIView class method. If you then look at inheritance, you will see that UIView is UIResponder:NSObject and CALayer is NSObject. None of these inherit from UIViewController which is why you are getting the error. You need to call [self.subViewGrid setNeedsDisplay]
Having an issue with MPMoviePLayerController with an overlay in iOS6, prior to iOS6 things were working fine.
It seems I can play a movie in full screen, before I had this code:
#interface MovieOverlayViewController : UIViewController
{
UIImageView *skiparrow;
}
#end
#implementation MovieOverlayViewController
-(void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
touchtoskip.frame = CGRectMake( xAdjust,
yAdjust,
touchtoskip.image.size.width / scale,
touchtoskip.image.size.height / scale);
[self.view addSubview:touchtoskip];
}
Then:
overlay = [[MovieOverlayViewController alloc] init];
UIWindow *keyWnd = [[UIApplication sharedApplication] keyWindow];
[keyWnd addSubview:overlay.view];
On my MoviePlayerViewController the view DOES appear. And adds the UIViews, but I see NOTHING anymore.
Really stuck, any suggestions?
I think part of the problem is that you are getting the key window and adding a subview to that, rather than getting the window's view and adding a subview to that.
Have a look at the MoviePlayer sample, which shows how to add a player with subviews to control playback.
Major head-scratcher all day on this one :-(
I have an instance of a UIPageViewController that does not appear to be firing the delegate method:
-(UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
I have tried various methods of displaying the UIPageViewController and have settled on a programatic approach (as opposed to a Storyboard one) that appears to be working correctly, with one exception... when rotating the iPad to landscape the spine does not appear mid-point as expected. I simply cannot find out why the delegate method does not get called.
Code Explanation (simplified for example)
Consider three classes as follows:
RootViewController - loaded when the app starts
PageViewController - loaded by RootViewController upon user initiation
PageContentViewController - loaded by PageViewController when pages are needed
Fairly self-explanatory. The RootViewController is loaded by the app upon launch. When the user taps an image within this view controller's view (think magazine cover opening a magazine) it launches the PageViewController as follows:
PageViewController *pvc = [[PageViewController alloc] initWithNibName:#"PageView"
bundle:[NSBundle mainBundle]];
pvc.view.frame = self.view.bounds;
[self.view addSubview:pvc.view];
In the actual app there is animation etc to make the transition all nice, but essentially the PageViewController's view is loaded and takes fullscreen.
PageViewController
This is the workhorse (only relevant methods shown). I have tried various examples from the infinite world of Google and written directly from the Apple docs...
#interface PageViewController : UIViewController <UIPageViewControllerDelegate, UIPageViewControllerDataSource>
#property (nonatomic, strong) UIPageViewController *pageViewController;
#property (nonatomic, strong) NSMutableArray *modelArray;
#end
#implementation TXCategoryController
-(void)viewDidLoad
{
[super viewDidLoad];
// Simple model for demo
self.modelArray = [NSMutableArray alloc] init];
for (int i=1; i<=20; i++)
[self.modelArray addObject:[NSString stringWithFormat:#"Page: %d", i]];
self.pageViewController = [[UIPageViewController alloc]
initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageViewController.delegate = self;
self.pageViewController.dataSource = self;
PageContentViewController *startupVC = [[PageContentViewController alloc] initWithNibName:#"PageContent" bundle:nil];
startupVC.pageLabel = [self.modelArray objectAtIndex:0];
[self.pageViewController setViewControllers:[NSArray arrayWithObject:startupVC]
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:nil];
[self addChildViewController:self.pageViewController];
[self.view addSubview:self.pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
self.pageViewController.view.frame = self.view.bounds;
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerBeforeViewController:(UIViewController *)viewController
{
// Relevant code to add another view...
}
-(UIViewController *)pageViewController:(UIPageViewController *)pageViewController
viewControllerAfterViewController:(UIViewController *)viewController
{
// Relevant code to add another view...
}
-(UIPageViewControllerSpineLocation)pageViewController:(UIPageViewController *)pageViewController
spineLocationForInterfaceOrientation:(UIInterfaceOrientation)orientation
{
// Setting a break point in here - never gets called
if (UIInterfaceOrientationIsPortrait(orientation))
{
// Relevant code to create view...
return UIPageViewControllerSpineLocationMin;
}
// Relevant code to create 2 views for side-by-side display and
// set those views using self.pageViewController setViewControllers:
return UIPageViewControllerSpineLocationMid
}
#end
This all works perfectly well as I mentioned earlier. The PageViewController's view gets shown. I can swipe pages left and right in both portrait and landscape and the respective page number appears. However, I don't ever see two pages side-by-side in landscape view. Setting a breakpoint in the spineLocationForInterfaceOrientation delegate method never gets called.
This is such a head-scratcher I have burned out of ideas on how to debug/solve the problem. It almost behaves like the UIPageViewController isn't responding to the orientation changes of the device and therefore isn't firing off the delegate method. However, the view gets resized correctly (but that could be just the UIView autoresizing masks handling that change).
If I create a brand new project with just this code (and appropriate XIb's etc) it works perfectly fine. So something somewhere in my actual project is causing this. I have no idea where to continue looking.
As usual, any and all help would be very much appreciated.
Side Note
I wanted to add the tag 'uipageviewcontrollerspinelocation' but couldn't because it was too long and I didn't have enough reputation (1500 required). I think this is a devious ploy on Apple's part to avoid certain tags in Stackoverflow... ;-)
Finally found the problem. It was something of a red herring in its symptoms, but related just the same.
Putting a break point in the shouldAutorotateToInterfaceOrientation: method was a natural test to see if the UIViewController was even getting a rotation notification. It wasn't which led me to Apple's technical Q&A on the issue: http://developer.apple.com/library/ios/#qa/qa1688/_index.html
The most relevant point in there was:
The view controller's UIView property is embedded inside UIWindow but alongside an additional view controller.
Unfortunately, Apple, in its traditional documentation style, doesn't provide an answer, merely confirmation of the problem. But an answer on Stack Overflow yielded the next clue:
Animate change of view controllers without using navigation controller stack, subviews or modal controllers?
Although my RootViewController was loading the PageViewController, I was doing it as a subview to the main view. This meant I had two UIViewController's in which only the parent would respond to changes.
The solution to get the PageViewController to listen to the orientation changes (thus triggering the associated spine delegate method) was to remove addSubview: and instead present the view controller from RootViewController:
[self presentViewController:pac animated:YES completion:NULL];
Once that was done, the orientation changes were being picked up and the PageViewController was firing the delegate method for spine position. Only one minor detail to consider. If the view was launched in landscape, the view was still displaying portrait until rotated to portrait and back to landscape.
That was easily tweaked by editing viewDidLoad as follows:
PageContentViewController *page1 = [[PageContentViewController alloc] initWithNibName:#"PageContent" bundle:nil];
NSDictionary *pageViewOptions = nil;
NSMutableArray *pagesArray = [NSMutableArray array];
if (IS_IPAD && UIInterfaceOrientationIsLandscape(self.interfaceOrientation))
{
pageViewOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:UIPageViewControllerSpineLocationMid]
forKey:UIPageViewControllerOptionSpineLocationKey];
PageContentViewController *page2 = [[PageContentViewController alloc] initWithNibName:#"PageContent" bundle:nil];
[pagesArray addObject:page1];
[pagesArray addObject:page2];
}
else
{
[pagesArray addObject:page1];
}
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl
navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal
options:pageViewOptions];
self.pageViewController.delegate = self;
[self.pageViewController setViewControllers:pagesArray
direction:UIPageViewControllerNavigationDirectionForward
animated:NO
completion:NULL];
Job done and problem solved.