- (void) showMediaPicker
{
MPMediaPickerController *picker =
[[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeAnyAudio];
[[picker view] setFrame:CGRectMake(0, 0, 320, 480)];
picker.delegate = self;
picker.allowsPickingMultipleItems = YES;
picker.prompt = NSLocalizedString (@"AddSongsPrompt", @"Prompt to user to choose some songs to play");
[self presentModalViewController:picker animated: YES];
[picker release];
}
- (void) mediaPicker: (MPMediaPickerController *) mediaPicker
didPickMediaItems: (MPMediaItemCollection *) collection
{
[self dismissModalViewControllerAnimated: YES];
[self playSelectedMediaCollection: collection];
}
- (void) playSelectedMediaCollection: (MPMediaItemCollection *) collection {
if (collection.count == 1) {
NSArray *items = collection.items;
MPMediaItem *mediaItem = [items objectAtIndex:0];
if ([mediaItem isKindOfClass:[MPMediaItem class]]) {
NSURL *url = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];
AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithURL:url];
AVMutableAudioMix *fadeMix = [AVMutableAudioMix audioMix];
AVMutableAudioMixInputParameters *params = [AVMutableAudioMixInputParameters audioMixInputParameters];
[params setVolumeRampFromStartVolume:0 toEndVolume:1 timeRange:
CMTimeRangeMake(CMTimeMakeWithSeconds(0, 1), CMTimeMakeWithSeconds(5,1))];
[fadeMix setInputParameters:[NSArray arrayWithObject:params]];
[playerItem setAudioMix:fadeMix];
AVPlayer *newAvPlayer = [[AVPlayer alloc] initWithPlayerItem:playerItem];
[newAvPlayer play];
}
}
}
このコードのビルド時エラーがi386アーキテクチャのための未定義のシンボルで再生できない曲を選択: から参照 "_CMTimeMakeWithSeconds"、: - [SongFileViewVC playSelectedMediaCollection:]から参照SongFileViewVC.o で "_CMTimeRangeMake" を、 : - [SongFileViewVC playSelectedMediaCollection:] SongFileViewVC.o LDに:記号(S)i386アーキテクチャ 打ち鳴らすが見つかりません:エラー:リンカーコマンドが終了コード1(呼び出しを確認するために-vを使用)MPMediaPickerControllerが
方法Iで失敗しましたそれを解決する。
私の文書ディレクトリに曲を保存したいのですが? –