- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
audioSession = [AVAudioSession sharedInstance];
NSError *err = nil;
UIDevice *device = [UIDevice currentDevice];
BOOL backgroundSupported = NO;
if ([device respondsToSelector:@selector(isMultitaskingSupported)]) {
backgroundSupported = device.multitaskingSupported;
}
if (backgroundSupported) {
NSLog(@"Supports multitasking");
[audioSession setCategory :AVAudioSessionCategoryPlayback error:&err];
}
else {
NSLog(@"Does not support multitasking");
[audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
}
if(err){
NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
}
[audioSession setActive:YES error:&err];
err = nil;
if(err){
NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
}
// Override point for customization after application launch.
[self.window makeKeyAndVisible];
return YES;
}
官方文档：
http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html