我的这个应用有多个 View Controller 。在应用程序委托(delegate)中,我将其设置为一旦应用程序完成启动,背景音乐就会开始。但是,在另一个 View Controller 上,我有一个播放该视频的按钮。我的问题是当我播放电影时,背景音频与电影重叠。我的问题是,如何在播放电影时停止音乐并在电影结束后播放音乐。 这是我的 app_delegate.h:
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface App_Delegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UINavigationController *navigationController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@end
这是我的 App_Delegate.m
#import "App_Delegate.h"
#import "RootViewController.h"
@implementation App_Delegate
@synthesize window;
@synthesize navigationController;
#pragma mark -
#pragma mark Application lifecycle
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
{NSString* soundFilePath = [[NSBundle mainBundle] pathForResource:@"beethoven_sym_5_i" ofType:@"mp3"];
NSURL* soundFileURL = [NSURL fileURLWithPath:soundFilePath];
AVAudioPlayer* player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundFileURL error:nil];
player.numberOfLoops=-1;
[player play];
}
// Override point for customization after application launch.
// Set the navigation controller as the window's root view controller and display.
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
return YES;
}
- (void)dealloc {
[navigationController release];
[window release];
[super dealloc];
}
@end
我的 MovieViewController.h:
#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
#import <AVFoundation/AVFoundation.h>
@interface MovieViewController : UIViewController {
IBOutlet UIScrollView *sesamescroller;
}
- (IBAction)playsesamemovie:(id)sender;
@end
最后,我的 MovieViewController.m
#import "MovieViewController.h"
@interface MovieViewController ()
@end
@implementation MovieViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
- (void)viewDidUnload
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (IBAction)playsesamemovie:(id)sender {
NSString *filepath = [[NSBundle mainBundle] pathForResource:@"How to make Sesame chicken" ofType:@"mp4"];
NSURL *fileURL = [NSURL fileURLWithPath:filepath];
MPMoviePlayerController *moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:fileURL];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePlaybackComplete:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:moviePlayerController];
[self.view addSubview:moviePlayerController.view];
moviePlayerController.fullscreen = YES;
[moviePlayerController play];
}
- (void)moviePlaybackComplete:(NSNotification *)notification
{
MPMoviePlayerController *moviePlayerController = [notification object];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:moviePlayerController];
[moviePlayerController.view removeFromSuperview];
[moviePlayerController release];
}
- (void)dealloc {
[sesamescroller release];
[super dealloc];
}
@end
最佳答案
您显示的代码有一个指向 player
对象的局部变量。要控制播放器,其他代码需要能够找到它。像这样:
在 App_Delegate.h
中:
@property (strong) AVAudioPlayer *player;
在 App_Delegate.m
中:(这个下划线是从哪里来的?非常规!)
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundFileURL error:nil];
self.player.numberOfLoops=-1;
[self.player play];
然后,无论你想在哪里控制它:
[((App_Delegate *)([UIApplication sharedApplication].delegate)).player pause];
// ...
[((App_Delegate *)([UIApplication sharedApplication].delegate)).player play];
关于ios - 停止背景音乐,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13792668/