题
嗨,我需要从iTunes资料库中播放歌曲。我已通过苹果的iPod库访问指南过去了,得到的代码。
MPMediaQuery *everything = [[MPMediaQuery alloc] init];
NSLog(@"Logging items from a generic query...");
NSArray *itemsFromGenericQuery = [everything items];
MPMediaItem *song;
for (song in itemsFromGenericQuery)
{
NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
NSLog (@"%@", songTitle);
}
//assign a playback queue containing all media items on the device
[myPlayer setQueueWithQuery:everything];//setQueueWithQuery:everything];
//start playing from the begining
[myPlayer play];
不过,这将启动从库列表的最开始播放。我需要播放一首歌曲时,我从列表中选择它。谁能帮我请...
谢谢, 世斌。
解决方案
使用MPMediaPickerController
例如,您可以从iPod库中的歌曲列表,专辑列表,选择等..这里是选择全部来自iPod和显示歌曲的模态视图控制器的例子。
- (IBAction) selectSong: (id) sender
{
MPMediaPickerController *picker =
[[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic];
picker.delegate = self;
picker.allowsPickingMultipleItems = NO;
picker.prompt = NSLocalizedString (@"Select any song from the list", @"Prompt to user to choose some songs to play");
[self presentModalViewController: picker animated: YES];
[picker release];
}
现在需要实现委托的歌曲存储到本地变量。这里,selectedSongCollection
是MPMediaItemCollection
的一个实例。
- (void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection
{
[self dismissModalViewControllerAnimated: YES];
selectedSongCollection=mediaItemCollection;
}
您与选择的歌曲完成后,实现委托驳回选择器:
- (void) mediaPickerDidCancel: (MPMediaPickerController *) mediaPicker
{
[self dismissModalViewControllerAnimated: YES];
}
其他提示
您要分配所有歌曲的音乐播放器的播放列表,所以当然是要发挥整个列表,从头开始。如果你希望用户从iPod库中选择特定歌曲,使用MPMediaPickerController
。
我不能在我的场景中使用theMPMediaPickerController
。
我的简短回答的问题就是看看[musicplayer setNowPlayingItem:item]
下面是一些代码从下面我的实现。
// Create a new query
MPMediaQuery *query = [MPMediaQuery songsQuery];
MPMediaPropertyPredicate *mpp = [MPMediaPropertyPredicate predicateWithValue:@"a" forProperty:MPMediaItemPropertyTitle comparisonType:MPMediaPredicateComparisonContains];
[query addFilterPredicate:mpp];
// Retrieve the results and reload the table data
DATAENV.songCollections = [NSMutableArray arrayWithArray:query.collections];
//populate cell rows with
- (UITableViewCell *)tableView:(UITableView *)tView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
MPMediaItem *item = [[[DATAENV.songCollections objectAtIndex:indexPath.row] items] lastObject];
titleLbl = [item valueForProperty:MPMediaItemPropertyTitle];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
MPMediaItem *item = [[[self.songCollections objectAtIndex:indexPath.row] items] lastObject];
[PLAYER setNowPlayingItem:item];
[PLAYER play];
}
其中PLAYER / DATAENV是我的单身
#define PLAYER [[AudioController sharedAudioController_instance] musicPlayer]
#define DATAENV [DataEnvironment sharedDataEnvironment_instance]
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