How to check if MPMediaLibrary did change ?

Gi-lo · 07-25-2011, 05:31 AM

Hey folks

,

I am building a music application and therefore I cache some data which I grab from the users iPod library first. I need to recreate the cache whenever the iPod library changes so I took a look at MPMediaLibrary.

Actually I found 2 interesting things:

lastModificationDate ->
Due to some googling, I know that this also gets called when the user creates a new playlist or such. Even worse, in my case it shows up the same date all the time.

Code:

NSLog(@"%@", [[MPMediaLibrary defaultMediaLibrary] lastModifiedDate]); // Always the same date

beginGeneratingLibraryChangeNotifications ->
The problem I have with this, is that after the notification is sent the MPMediaQuery is still the same. After around 5 seconds it changes. I dont want to let my users wait 5 seconds ... :/

Code:

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(_handle_MediaLibraryDidChangeNotification)
                                                 name:MPMediaLibraryDidChangeNotification
                                               object:[MPMediaLibrary defaultMediaLibrary]];
    [[MPMediaLibrary defaultMediaLibrary] beginGeneratingLibraryChangeNotifications];

All in all I am pretty frustrated now. Is there no way to check if the iPod library did change?

iSDK · 07-25-2011, 05:57 AM

Might help, iphone - Load songs from iPod Library right after sync - Stack Overflow

Max.

Quote:

Originally Posted by Gi-lo

Hey folks

,

I am building a music application and therefore I cache some data which I grab from the users iPod library first. I need to recreate the cache whenever the iPod library changes so I took a look at MPMediaLibrary.

Actually I found 2 interesting things:

lastModificationDate ->
Due to some googling, I know that this also gets called when the user creates a new playlist or such. Even worse, in my case it shows up the same date all the time.

Code:

NSLog(@"%@", [[MPMediaLibrary defaultMediaLibrary] lastModifiedDate]); // Always the same date

beginGeneratingLibraryChangeNotifications ->
The problem I have with this, is that after the notification is sent the MPMediaQuery is still the same. After around 5 seconds it changes. I dont want to let my users wait 5 seconds ... :/

Code:

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(_handle_MediaLibraryDidChangeNotification)
                                                 name:MPMediaLibraryDidChangeNotification
                                               object:[MPMediaLibrary defaultMediaLibrary]];
    [[MPMediaLibrary defaultMediaLibrary] beginGeneratingLibraryChangeNotifications];

All in all I am pretty frustrated now. Is there no way to check if the iPod library did change?

Gi-lo · 07-25-2011, 08:23 AM

Quote:

Originally Posted by iSDK

Might help, iphone - Load songs from iPod Library right after sync - Stack Overflow

Max.

Thanks for the tip but initializing an instance of MPMediaPicker is always not nil for me. Also I cannot listen for "lastModificationDate" changes, as in my case it is never changing :/