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iOS SDK Programming: A Beginner s Guide
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using the backgroundColor property You change a movie s scaling using the scalingMode property, and you change the controls presented using the movieControlMode property The backgroundColor property changes the movie player s background color when playing a movie For instance, when you watch a video using the Video application on an iPod touch, the background is black If you wish, you can change that color using this property The scalingMode property changes a movie s scaling Valid values for scalingMode are MPMovieScalingModeNone, MPMovieScalingModeAspectFit, MPMovieScalingModeAspect Fill, and MPMovieScalingModeFill The movieControlMode property determines the visible controls when a movie plays For instance, when playing a movie using the Video application, if you tap the screen, it presents a control showing the volume, a control showing the location in the video, a scaling control, and a Done button You can modify which control a player presents using this property Valid values are MPMovieControlModeDefault, MPMovieControlModeVolumeOnly, and MPMovie ControlModeHidden You initialize a movie player using the initWithContentURL: method This method takes an NSURL to the movie s location This location must be within your application s sandbox or available via an Internet server (it s a URL) After initializing the player, you call the prepareToPlay and play methods If you wish to be notified that the player has stopped playing, you register as a notification listener, listening for the player s MPMoviePlayerPlay backDidFinishNotification notification
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1 Create a new View-based Application called MoviePlayer Add the Media Player
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2 Add the movie short3gp from the sample code Resources folder to the project s Resources
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3 Open MoviePlayerController and add an MPMoviePlayerController as a property; name it
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moviePlayer (Listings 18-9 and 18-10) Do not forget to import the MediaPlayer Listing 18-9 MovieplayerViewControllerh
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#import <UIKit/UIKith> #import <MediaPlayer/MediaPlayerh> @interface MovieplayerViewController : UIViewController { MPMoviePlayerController * movieplayer; } @property (nonatomic, retain) MPMoviePlayerController * movieplayer; -(IBAction) playMovie: (id) sender; -(void) playingDone; @end
18:
Multimedia
Listing 18-10
MovieplayerViewControllerm
#import "MovieplayerViewControllerh" @implementation MovieplayerViewController @synthesize movieplayer; -(void) viewDidLoad { [[NSNotificationCenter defaultCenter] addObserver:self selector: @selector (playingDone) name:MPMoviePlayerPlaybackDidFinishNotification object:nil]; } -(IBAction) playMovie: (id) sender { movieplayer = [[MPMoviePlayerController alloc] initWithContentURL: [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"short" ofType:@"3gp"]]]; // Only iOS 32 and above respond to the loadState selector if ([movieplayer respondsToSelector:@selector(loadState)]) { // Our application runs in portrait orientation, // so on iOS 32 and later, the movie player will also // display in portrait mode by default // The next few lines change the orientation to landscape [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO]; // Rotate the view for landscape playback [[self view] setBounds:CGRectMake(0, 0, 480, 320)]; [[self view] setCenter:CGPointMake(160, 240)]; [[self view] setTransform:CGAffineTransformMakeRotation(M_PI / 2)]; // Set frame of movie player [[movieplayer view] setFrame:CGRectMake(0, 0, 480, 320)]; // Add movie player as subview [[self view] addSubview:[movieplayer view]]; // Play the movie [movieplayer play]; } else { // Prior to iOS 32, this was enough to play the movie correctly [movieplayer play]; } } -(void) playingDone { [movieplayer release]; movieplayer = nil; } -(void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [movieplayer release]; [super dealloc]; } @end
(continued)
iOS SDK Programming: A Beginner s Guide
4 Add a method called playingDone and an IBAction called playMovie to MoviePlayerView
Controller Implement both methods the same as in Listing 18-10 Also implement the viewDidLoad method
5 Save your changes and open MovieplayerViewControllerxib 6 Add a button to the canvas and connect it to the playMovie action 7 Save your changes and click Run Click the play movie button and an old B&W movie will
play in landscape orientation
Like the music player, you register to listen to the finished playing event in the viewDidLoad method Notice that unlike the previous task, you didn t place the event s name in quotations This omission was intentional The event and the event s NSString name are the same, and you can use either The viewDidLoad method also initializes the movie player with the short3gp movie s location In a real-world application, loading a movie when a view loads is probably not a good idea, as movies are usually quite large When a user taps the button, the movie player begins playing the movie in landscape mode (Figure 18-4) Upon tapping the Done button, the user returns to the application s view in portrait mode The controller also receives the notification that the player stopped playing and releases the player
Figure 18-4
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