我想访问iPhone上可用的音乐文件并将其列出(或)将文件放入我的iPhone应用程序中,一些代表和开始播放。这是否可能?类似于我们使用UIImagePickerController委托方法从设备照片库访问图像的方式。
谢谢!
谢谢!
-(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
是一个NSObject
类。使用上述函数,您可以从iPhone访问设备音乐文件。
您可以参考MPMediaPickerController类
。它与UIImagePickerController
类具有相同的功能。
首先导入AVFoundation/AVFoundation.h框架。
#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];
}
并使用[player play];
进行播放。
如果要使用AVAudioPlayer
,则需要导入AudioToolbox/AudioToolbox.h
。