回答編集履歴
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コード追加
test
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@@ -1,3 +1,97 @@
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iOSは許可された特定の状態のアプリ以外はプロセスが完全に停止します。
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Appleが規定する動作(アプリがオーディオを再生しているとかGPSを取得している等)以外でバックグラウンドで動くことはできないのでそういったログ行為はできないと思います。
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```Objective-C
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- (BOOL)application:(UIApplication *)application
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didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
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{
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_player = [MPMusicPlayerController systemMusicPlayer];
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[_player beginGeneratingPlaybackNotifications];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(onPlayItemChanged:)
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name:MPMusicPlayerControllerNowPlayingItemDidChangeNotification
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object:nil];
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[[UIApplication sharedApplication] setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum];
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return YES;
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}
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- (void)onPlayItemChanged:(NSNotification*)notify
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{
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MPMediaPropertyPredicate* pred;
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NSNumber* persistentId = notify.userInfo[@"MPMusicPlayerControllerNowPlayingItemPersistentIDKey"];
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pred = [MPMediaPropertyPredicate predicateWithValue:persistentId
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forProperty:MPMediaItemPropertyPersistentID];
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MPMediaQuery* query;
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query = [[MPMediaQuery alloc] initWithFilterPredicates:[NSSet setWithObject:pred]];
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for(MPMediaItem* item in query.items){
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NSLog(@"%s '%@' '%@' '%@' %@", __func__, item.title, item.artist, item.albumTitle, item.lastPlayedDate);
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}
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}
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- (void)application:(UIApplication *)application
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performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
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{
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NSLog(@"%s", __func__);
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completionHandler(UIBackgroundFetchResultNewData);
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}
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```
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