Access device music files from iPhone app programm

问题:

I want to access music files which are available on the iPhone and get it listed (or) get the file into my iPhone application some delegats and start playing it. Is it possible to do it ? Similar to how we access images from device photo album using UIImagePickerController delegate methods.

Thank you!

回答1:

You can reference MPMediaPickerController class. It functions same as UIImagePickerController class.

回答2:

-(void)loadDeviceMusic{
     MPMediaQuery *everything = [[MPMediaQuery alloc] init];
    [everything addFilterPredicate:[MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithBool:NO] forProperty:MPMediaItemPropertyIsCloudItem]];
    NSArray *itemsFromGenericQuery = [everything items];
    for (MPMediaItem *song in itemsFromGenericQuery) {
    NSURL *assetURL = [song valueForProperty:MPMediaItemPropertyAssetURL];
    AVAsset *asset = [AVAsset assetWithURL:assetURL];
    NSLog(@"SONGS URL=%@",assetURL);
    if ([asset hasProtectedContent] == NO) {
        MP3ObjectsClass *objMp3=[[MP3ObjectsClass alloc] init];
        objMp3.mp3Url=[song valueForProperty:MPMediaItemPropertyAssetURL];

        objMp3.mp3Duration=[song valueForProperty: MPMediaItemPropertyPlaybackDuration];

        if([song valueForProperty: MPMediaItemPropertyTitle]){
            objMp3.mp3Name=[song valueForProperty: MPMediaItemPropertyTitle];
        }else{
            objMp3.mp3Name=@"Unknown";
        }
        if([song valueForProperty: MPMediaItemPropertyArtist]){
            objMp3.mp3ArtistName=[song valueForProperty: MPMediaItemPropertyArtist];
        }else{
            objMp3.mp3ArtistName=@"Unknown";
        }
        if([song valueForProperty: MPMediaItemPropertyAlbumTitle]){
            objMp3.mp3AlbumTitle=[song valueForProperty: MPMediaItemPropertyAlbumTitle];
        }else{
            objMp3.mp3AlbumTitle=@"Unknown";
        }
        UIImage *mp3Image=[self getAlbumnArtWorkImage:assetURL];
        if(mp3Image){
            objMp3.mp3Image=mp3Image;
        }else{
            objMp3.mp3Image=[UIImage imageNamed:@"DefaultImage"];
        }
        [mp3Array addObject:objMp3];
    }
}
}

-(UIImage *)getAlbumnArtWorkImage :(NSURL *)mp3Url{

AVAsset *asset = [AVURLAsset URLAssetWithURL:mp3Url options:nil];
UIImage *img = nil;
for (NSString *format in [asset availableMetadataFormats]) {
    for (AVMetadataItem *item in [asset metadataForFormat:format]) {
        if ([[item commonKey] isEqualToString:@"artwork"]) {
            img = [UIImage imageWithData:[item.value copyWithZone:nil]];
        }
    }
}
return img;
}

*** MP3ObjectsClass is a NSObject class. Using above function you can access device music files from iPhone.

回答3:

First import the AVFoundation/AVFoundation.h framework.

#import <AVFoundation/AVFoundation.h>
-(void)pickAudioFiles
{
    MPMediaPickerController *soundPicker=[[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAnyAudio];
    soundPicker.delegate=self;
    soundPicker.allowsPickingMultipleItems=NO;
    [self presentViewController:soundPicker animated:YES completion:nil];
}

-(void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
{
    MPMediaItem *item = [[mediaItemCollection items] objectAtIndex:0];
    NSURL *url = [item valueForProperty:MPMediaItemPropertyAssetURL];
    [mediaPicker dismissViewControllerAnimated:YES completion:nil];
    AVPlayerItem *playerItem=[AVPlayerItem playerItemWithURL:url];
    AVPlayer *player=[[AVPlayer alloc] initWithPlayerItem:playerItem];
    AVPlayerLayer *playerLayer=[AVPlayerLayer playerLayerWithPlayer:player];
    playerLayer.frame=CGRectMake(0, 0, 10, 10);
    [self.view.layer addSublayer:playerLayer];
}

and play with [player play];

If you want to use AVAudioPlayer then import AudioToolbox/AudioToolbox.h