mpmediaitem

问题 I'm attempting to use MPMusicPlayerController to play apple music songs, but I can't get the lock screen controls to work. It seems as though MPMusicPlayerController overridess the remoteControlReceivedWithEvent listener. Here is how I set up my controller: self.player = [MPMusicPlayerController applicationMusicPlayer]; self.player.repeatMode = MPMusicRepeatModeNone; self.player.shuffleMode = MPMusicShuffleModeOff; [self.player beginGeneratingPlaybackNotifications]; [[NSNotificationCenter

问题 I am trying to play a MediaItem using AVPlayer and later trying to get the duration of the current item like this (duration is an object of type CMTime): duration = [[player currentItem] duration]; I get no issues in iPad but in iPod Touch, I get the following error. I haven't tried this in iPhone yet. Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AVPlayerItem duration]: unrecognized selector sent to instance 0x186100' Any pointers to the fix will be

问题 I am trying to execute this code in order to get all the music playlists that the users can have on their phones. var queryPlaylists = MPMediaQuery.playlistsQuery() print(queryPlaylists.collections[0]) However, when I try to access any of the elements of queryPlaylists.collections I get a compilation error: Cannot subscript a value of type [MPMediaItem]. This does not make any sense to me since the above in an array. In addition this used to work before xcode 7.0. 回答1: I figured out in order

问题 I'm trying to convert an MPMediaItem to NSData object so I can play it with AVAudioPlayer. The following answer was posted a while back on a similar question, with steps on how to to that: MPMediaItems raw song data Of course you can access the data of a MPMediaItem. It's not crystal clear at once but it works. Here's how: Get the media item's URL from it's MPMediaItemPropertyAssetURL property Initialize an AVURLAsset with this URL Initialize an AVAssetReader with this asset Fetch the

问题 I need to display a list of all of the playlists currently on the device. The problem is, on a device with iTunes Match turned on, any number of playlists could have zero items saved on the phone. Since (as far as I can tell) there's no reliable way to trigger an MPMediaItem download when you're using AVAudioPlayer , I'd like to filter out any playlists that don't have any local entries. Right now I can have it cycle through an individual playlist and strip songs that don't have an assetURL ,

问题 I need to display a list of all of the playlists currently on the device. The problem is, on a device with iTunes Match turned on, any number of playlists could have zero items saved on the phone. Since (as far as I can tell) there's no reliable way to trigger an MPMediaItem download when you're using AVAudioPlayer , I'd like to filter out any playlists that don't have any local entries. Right now I can have it cycle through an individual playlist and strip songs that don't have an assetURL ,

问题 I know I can get all the audiobooks from the iPod library with: MPMediaPropertyPredicate *abPredicate = [MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeAudioBook] forProperty:MPMediaItemPropertyMediaType]; MPMediaQuery *abQuery = [[MPMediaQuery alloc] init]; [abQuery addFilterPredicate:abPredicate]; [abQuery setGroupingType:MPMediaGroupingAlbum]; NSArray *books = [abQuery collections]; And I can get the parts/files for each book by using this: [book items];

问题 I know I can get all the audiobooks from the iPod library with: MPMediaPropertyPredicate *abPredicate = [MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeAudioBook] forProperty:MPMediaItemPropertyMediaType]; MPMediaQuery *abQuery = [[MPMediaQuery alloc] init]; [abQuery addFilterPredicate:abPredicate]; [abQuery setGroupingType:MPMediaGroupingAlbum]; NSArray *books = [abQuery collections]; And I can get the parts/files for each book by using this: [book items];

问题 i'm developing an app that export audio file stored in the iPod library, but i should verify the file size before export and upload (server has a fixed max upload size): i know that after exporting file, the size will not be the same: is there any method to estimate the new size ? main question : can i know the original file size before export (using MPMediaItem or something else), so i can tell user that this file can't be uploaded (the export can take a while). thanks. 回答1: I have not

问题 I'm seeing a consistent issue with MPMediaItemArtwork in that it's returning artwork in a size different to that which I request. The code I'm using is as follows MPMediaItem *representativeItem = [self.representativeItems objectAtIndex:index]; MPMediaItemArtwork *artwork = [representativeItem valueForProperty:MPMediaItemPropertyArtwork]; UIImage *albumCover = [artwork imageWithSize:CGSizeMake(128.0f, 128.0f)]; This works as expected, except that the size of the returned image is always {320