I have this code trying to run a video on the iPhone 4 Simulator.
The problem is that looks like it loads the player but half a second later loads a back screen on top of the whole application disabling touch and everything, and it looks like it does not play the video also, because I can't hear anything.
Any ideas?!
MPMoviePlayerViewController *mp =
[[MPMoviePlayerViewController alloc] initWithContentURL:videoUrl];
if (mp) {
mp.moviePlayer.scalingMode = MPMovieScalingModeFill;
mp.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
[mp.moviePlayer play];
[self presentMoviePlayerViewControllerAnimated:mp];
[mp release];
}
I believe the problem is caused by releasing the MPMoviePlayerViewController. Simply retain the controller until you are done with it.
Prior to the "[mp release];" add this line to save the value away.
self.moviePlayerViewController = mp;
Then update your dealloc method to do the release:
- (void)dealloc {
[_moviePlayerViewController release], _moviePlayerViewController = nil;
[super dealloc];
}
Add the synthesize to the top of your .m file:
#synthesize moviePlayerViewController = _moviePlayerViewController;
Add the defination to the #interface of your .h file:
MPMovieViewController *_moviePlayerViewController;
Add the property to your .h file:
#property (readwrite, retain) MPMovieViewController *moviePlayerViewController;
You may need some headers in your header:
#import <MediaPlayer/MediaPlayer.h>
#import <MediaPlayer/MPMoviePlayerViewController.h>
You may also need to balance your "presentMoviePlayer" call with the dismiss somewhere:
[self dismissMoviePlayerViewControllerAnimated];
Phew, code everywhere. Anyway, if you are finished with the resource early, you may be able to release it sooner by using NotificationManager to watch for MPMoviePlayerPlaybackDidFinishNotification. There are many examples of that, so I won't repeat it.
Hope this helps.
This is the code I'm using:
MPMoviePlayerViewController *movieViewController = [[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:contentUrl]];
movieViewController.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
[self presentMoviePlayerViewControllerAnimated:movieViewController];
[movieViewController release];
It seems to work fine for me. Two notes:
Some simulators (like the current iOS 5.0) crash when playing a movie, but it works on a real device
if you leave out the movieSourceType part, a black screen is shown for about a second before the movie starts
Related
Okay, so I'm a newbie trying to write a practice app where you click a button, an NSOpenPanel appears, you select an image file, and the image gets displayed in an NSImageView.
I've got the open panel working okay, and it returns an NSArray of NSURLs. I avoided using filename paths as the Apple docs said it was depreciated. I then try to make an NSImage object using initWithContentsOfURL, and then try to setImage of the NSImageView to the new image.
Here's what I think are the relevant parts of the implementation...
- (IBAction)openImage:(NSButton *)sender {
NSLog(#"%# was clicked", sender);
NSOpenPanel *panel = [[NSOpenPanel alloc] init];
if ([panel runModal] == NSModalResponseOK)
{
NSArray* selectedFile = [panel URLs];
NSLog(#"%# was selected", selectedFile[0]);
NSImage *theImage = [[NSImage alloc] initWithContentsOfURL:selectedFile[0]];
[imageViewer setImage:theImage];
}
}
And from the header:
#property (weak) IBOutlet NSImageView *imageViewer;
- (IBAction)openImage:(NSButton *)sender;
#end
When I try to set the image, Xcode says there's imageViewer is undeclared, and wants to correct it to _imageViewer. I tried following its advice and ran it, but then the app just crashes once I select a file from the open panel so something is obviously still not right.
The NSLog lines shows the button was clicked, and shows the correct URL of the file selected, but I'm having issues setting the NSImageView. It's probably something really simple but I can't seem to figure it out.
You need to declare the variable imageViewer in your headers (.h) interface , for example:
#interface AppDelegate : NSObject <NSApplicationDelegate> {
IBOutlet NSImageView *__weak imageViewer;
}
#property (weak) IBOutlet NSImageView *imageViewer;
- (IBAction)openImage:(NSButton *)sender;
#end
Then in your class (.m) just synthesize the variable:
#implementation AppDelegate
#synthesize imageViewer;
...
Since you hadn't declared the variable in the interface you were receiving the error.
Try this code.
- (IBAction)openImage:(NSButton *)sender {
NSLog(#"%# was clicked", sender);
NSOpenPanel *panel = [[NSOpenPanel alloc] init];
if ([panel runModal] == NSModalResponseOK)
{
NSArray* selectedFile = [panel URLs];
NSLog(#"%# was selected", selectedFile[0]);
NSURL *url = (NSURL *)selectedFile[0];
NSString *filePath = [url absoluteString];
NSImage *theImage = [[NSImage alloc] initWithContentsOfFile:filePath];
[imageViewer setImage:theImage];
}
}
Okay, so I feel stupid now. I'm still learning stuff so I wasn't sure why it was freezing up until I noticed Xcode kept switching to the "Debug" panel, which clued me into what might be happening.
I figured out I accidentally clicked a line number, which apparently sets breakpoints for debugging. I also might have somehow clicked "Toggle global breakpoint state" in the bottom Debug area.
Because I selected the line where the setImage was, it looked like the app crashed/froze whenever it hit that line, but it actually just paused the app to allow me to look at what's going on with the app and debug it. I deselected the lines and turned off the global breakpoint state button and everything runs fine now.
A newbie coder mistake from somebody not used to working in an IDE. :P
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.
I'm having trouble playing a video on the iPhone. I have a file in the app bundle and I am trying to play it in a MPMoviePlayerController but it is just displaying a black screen. This is the following code:
-(UIView*)createVideoPlayerOfWidth:(CGFloat)width
{
// The width for one of these can be half of the max width
//CGFloat widthAndHeight = width / 2.0f;
// TODO: Create a video player
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"myVideo" ofType:#"mov"]];
MPMoviePlayerController *playerController = [[MPMoviePlayerController alloc] initWithContentURL:url];
[playerController prepareToPlay];
[playerController setShouldAutoplay:NO];
[playerController setScalingMode:MPMovieScalingModeAspectFit];
[playerController setControlStyle:MPMovieControlStyleEmbedded];
[playerController setRepeatMode:MPMovieRepeatModeNone];
// Resize the thumbnail of the video
[[playerController view] setFrame:CGRectMake(0, 0, width, width)];
return [playerController view];
}
It is returning a valid URL (pathForResource would return nil if it couldn't find the file). I am displaying it to the screen by just adding a subView (the view returned by the function) to a scroll view. I've been trying to solve this for ages now and am getting nowhere. Any help is much appreciated.
Thanks!
Make sure you are retaining a reference to the MPMoviePlayerController instance:
If this is an ARC project, then playerController will be destroyed when createVideoPlayerOfWidth returns, and your video probably won't play. You should store the player in a strong instance variable or property.
You could add something like this to the top of your view controller file:
#interface MyViewController ()
#property (nonatomic,retain) MPMoviePlayerController *player;
#end
And insert this after you create the MPMoviewPlayerController instance:
self.player = playerController;
If you're not using ARC, this is probably not the problem, but you should still keep a reference in an instance variable, so that you can release it later.
A quick rundown of whats happening here.
I've got a GameScene and a GameOverUIController. When Game ends, It loads the GameOverUIController, which loads the xib, which loads the MobFoxBannerView.
Here's the issue: If you push the "play again" button to fast or you play a round longer than about 3 minutes, the ad loads in the background but essentially has no where to go, and crashes.
I took a friends advice of adding the ViewDidUnload to set the bannerview to nil, but it still crashes... I'm not the most amazing programmer admitted, but I feel like I'm making the dumbest error somewhere... Any help is greatly appreciated. Am I just using the wrong syntax on something here?
I've done the following things.
I synthesize bannerView on the GameOverUI Implementation.
Manually adding it to the view now, before I had added a UIwebview directly to xib Interface builder for GameOverUIController
self.bannerView = [[[MobFoxBannerView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)] autorelease];
bannerView.delegate = self;
[self.view addSubview:bannerView];
[self.view bringSubviewToFront:bannerView];
And thats in my main implementation. So everytime it loads the GameOver Screen it requests a new add.
Then I set the values in the header file.
-(NSString *) publisherIdForMobFoxBannerView:(MobFoxBannerView *)banner;
#property (nonatomic, retain) MobFoxBannerView *bannerView;
and set my publisher ID in the the bottom of GameOverUIController.m
- (NSString *)publisherIdForMobFoxBannerView:(MobFoxBannerView *)banner
{
return #"xxxxxxxxxxxx";
}
Then... STILL get a crash so then I tried to set it to nil hoping that would work... but I'm not sure about the syntax...
On GameOverUIController.m
- (void)viewDidUnload
{
[super viewDidUnload];
self.bannerView = nil;
// or ? bannerView.delegate = nil;
}
Niether of those lines works..... I'm at a total loss. Going to move onto another ads platform unless I can figure this out before the weekend is over. Bane of my existence right now. Any help would be greatly appreciated. Thank you very much
Edit:
Figured it out...
Had nothing to do with ViewUnload....
- (void)dealloc
{
bannerView.delegate = nil;
[super dealloc];
}
Was adding it to the wrong location... Works perfectly now.
I guess your problem is in
bannerView.delegate = self;
when add is loaded (because of bad internet it can be very slow for instance) - delegate method is being called, but "self" is released - so runtime exception is thrown.
By the way, I don't know a thing about MobFox framework. It's just a common anti-pattern.
I'd like to know how to open the camera inside of a pre-defined frame (not the entire screen). When the view loads, I have a box, and inside it, I want to display what the camera sees. I don't want to snap a picture, just basically use the camera as a viewfinder. I have searched this site and have not yet found what I'm looking for. Please help.
Thanks!
Thomas
Update 1:
Here is what I have tried so far.
1.) I added UIImageView to my xib.
2.) Connect the following outlet to the UIImageView in IB
IBOutlet UIImageView *cameraWindow;
3.) I put the following code in viewWillAppear
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:picker animated:YES];
NSLog(#"viewWillAppear ran");
}
But this method does not run, as evident by the absence of NSLog statement from my console. Please help!
Thanks,
Thomas
Update 2:
OK I got it to run by putting the code in viewDidLoad but my camera still doesn't show up...any suggestions? Anyone....? I've been reading the UIImagePickerController class reference, but am kinda unsure how to make sense of it. I'm still learning iPhone, so it's a bit of a struggle. Please help!
- (void)viewDidLoad
{
[super viewDidLoad];
// Create a bool variable "camera" and call isSourceTypeAvailable to see if camera exists on device
BOOL camera = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
// If there is a camera, then display the world throught the viewfinder
if(camera)
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
// Since I'm not actually taking a picture, is a delegate function necessary?
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentModalViewController:picker animated:YES];
NSLog(#"Camera is available");
}
// Otherwise, do nothing.
else
NSLog(#"No camera available");
}
Thanks!
Thomas
Update 3:
A-HA! Found this on the Apple Class Reference.
Discussion
The delegate receives notifications
when the user picks an image or movie,
or exits the picker interface. The
delegate also decides when to dismiss
the picker interface, so you must
provide a delegate to use a picker. If
this property is nil, the picker is
dismissed immediately if you try to
show it.
Gonna play around with the delegate now. Then I'm going to read on wtf a delegate is. Backwards? Whatever :-p
Update 4:
The two delegate functions for the class are
– imagePickerController:didFinishPickingMediaWithInfo:
– imagePickerControllerDidCancel:
and since I don't actually want to pick an image or give the user the option to cancel, I am just defining the methods. They should never run though....I think.
add
[picker
dismissModelViewControllerAnimated:YES];
to delegate method bodies.
It will dismiss the view.