ios - 媒体选择器项目选择

Question

我希望我的代码允许我通过我的 iPod 库选择多个项目。目前我可以选择一首歌曲。我想修改我的代码以允许将一系列歌曲添加到队列中。当前为“选择多个项目”选择"is"允许进行选择，但播放仅包含一首歌曲。第一个选择的。

我该如何改变这个。我在下面包含了我的代码示例...

@implementation ProjectViewController


/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}
*/

/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/



// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad 
{
    [self performSelector:@selector(presentLibrary) withObject:nil afterDelay:0.1];
    [super viewDidLoad];

}

-(void)presentLibrary
{
    MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic];
    // picker.navigationController.delegate = self;
    picker.delegate = self;
    picker.allowsPickingMultipleItems = YES;
    picker.prompt  = NSLocalizedString (@"Select any song from the list", @"Prompt to user to choose some songs to play");
    //[self.view addSubview:picker.view];
    [self presentModalViewController: picker animated: YES];
    //picker.view.frame = CGRectMake(picker.view.frame.origin.x, 0, picker.view.frame.size.width, picker.view.frame.size.height);
    [picker release];

}

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/



- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:
(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations
    //return (interfaceOrientation == UIInterfaceOrientationPortrait);
    return YES;    



}




- (void)dealloc {
    [super dealloc];
}


- (IBAction)onlaunch:(id)sender
{
    xxxxxxxx ViewController *viewController = [[xxxxxxxxxViewController alloc] init];
    [self presentModalViewController:viewController animated:YES];
    [viewController release];
}

-(void)viewDidAppear:(BOOL)animated
{

}


- (void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection
{
    [self dismissModalViewControllerAnimated: NO];
    //[mediaPicker.view removeFromSuperview];
    //NSURL *url = [NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"screen1.mp4"]]; //test.caf
    NSURL *url = [[mediaItemCollection.items objectAtIndex: 0] valueForProperty:MPMediaItemPropertyAssetURL];
    NSLog(@"url:%@",url);
    [[ShareInfo shareduserInfoManager] setSongUrl:url];
    [self goToxxxxxxxxxyView];
}

- (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker
{
    [self dismissModalViewControllerAnimated: NO];
    [[ShareInfo shareduserInfoManager] setSongUrl:nil];
    [self goToxxxxxxxxxView];
}

-(void)goToxxxxxxxView
{
    xxxxxxxxxxxxxx *viewController = [[xxxxxxxxxxxxxxxr alloc] init];
    [self presentModalViewController:viewController animated:YES];
    [viewController release];
}
@end

Answer 1

而不是

NSURL *url = [[mediaItemCollection.items objectAtIndex: 0] valueForProperty:MPMediaItemPropertyAssetURL];

这是选择第一首歌曲，

尝试

if (mediaItemCollection)
    [musicPlayer setQueueWithItemCollection: mediaItemCollection];