贝娄是在iOS设备的的iPod库中获取项目的代码,我遇到的问题是获得正确的做MPMediaItemProperty
。 我的理解是,如果我想要得到这样的作品,评论标题数据的方式-我得走的一个媒体项目MPMediaItemCollection
在我的班级- (MPMediaItem *)mediaItemForRow: (NSInteger)row
法。
这里的问题是,我没有得到同样的信息作为苹果有 - 因心中已经在他们的播客应用检查。 他们必须使用获得的数据的一些其他的方式,因为我只能从每个蹦床网上单播客节目的意见。 而且我也只得到艺术品某些播客。 而在播客应用它们都具有艺术品。
所以,我一定要在这里做得不对?
@interface testclassViewController ()
@property (nonatomic, strong) NSArray *audiobooks;
@end
@implementation testclassViewController
- (void)viewDidLoad
{
[super viewDidLoad];
MPMediaItem *mediaItem = [self mediaItemForRow:0];
self.testText.text = [mediaItem valueForProperty:MPMediaItemPropertyComments];
MPMediaItemArtwork *img = [mediaItem valueForProperty:MPMediaItemPropertyArtwork];
UIImage *artworkUIImage = [img imageWithSize:CGSizeMake (128, 128)];
self.testImage.image = artworkUIImage;
}
#pragma mark - query settings
- (MPMediaPropertyPredicate *)mediaTypeToFetchFromiPodLibrary
{
MPMediaPropertyPredicate *abPredicate =
[MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypePodcast]
forProperty:MPMediaItemPropertyMediaType];
return abPredicate;
}
- (MPMediaQuery *)setMediaQueryOptions: (MPMediaQuery*)abQuery
withPredicate: (MPMediaPropertyPredicate*) abPredicate
{
[abQuery addFilterPredicate:abPredicate];
//[abQuery setGroupingType:MPMediaGroupingAlbum];
[abQuery setGroupingType:MPMediaGroupingPodcastTitle];
return abQuery;
}
#pragma mark -
- (MPMediaItem *)mediaItemForRow: (NSInteger)row
{
NSArray *audiobooks = self.audiobooks;
MPMediaItem *mediaItem = nil;
id object = audiobooks[row];
if ([object isKindOfClass:[MPMediaItemCollection class]]) {
MPMediaItemCollection *book = (MPMediaItemCollection *)object;
id item = [book items][0];
if ([item isKindOfClass:[MPMediaItem class]]) {
mediaItem = (MPMediaItem *)item;
}
}
return mediaItem;
}
/* Get´s the sub items for Podcasts title */
- (NSArray *)subMediaItemsForPodcastTitle: (NSString *)podcastTitle
{
NSMutableArray *subMediaItemsToReturn = [NSMutableArray array];
for (id collections in self.audiobooks) {
if ([collections isKindOfClass:[MPMediaItemCollection class]]) {
MPMediaItemCollection *collection = (MPMediaItemCollection *)collections;
for (id mediaItems in collection.items) {
MPMediaItem *mediaitem = (MPMediaItem *)mediaItems;
NSString *mediaItemTitle = [mediaitem valueForProperty:MPMediaItemPropertyPodcastTitle];
if ([mediaItemTitle isEqual:podcastTitle]) {
//NSLog(@"found mediaItem belonging to title: %@",mediaItemTitle);
[subMediaItemsToReturn addObject:mediaitem];
}
}
}
}
return subMediaItemsToReturn;
}
// property getter
- (NSArray *)audiobooks
{
MPMediaPropertyPredicate *abPredicate = [self mediaTypeToFetchFromiPodLibrary];
MPMediaQuery *abQuery = [[MPMediaQuery alloc] init];
abQuery = [self setMediaQueryOptions:abQuery withPredicate:abPredicate]; // Abstract
NSArray *books = [abQuery collections];
return books;
}
@end