回答編集履歴
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サンプルコード追記
test
CHANGED
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@@ -21,3 +21,161 @@
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そこにアクセスしたらよさそうに思いました。
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もしその場所がselfであれば、self.playlistでアクセスしたらいいですし、何かのタイミングでself.playlistをnilにすることがあるのなら、self.playlistがnilか確認してからアクセスしたらいいです。
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(11/21 サンプルコード追記)
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``` Objective-C
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#import "ViewController.h"
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// AVPlayerItem擬似クラス
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@interface AVPlayerItem : NSObject
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@property(nonatomic, strong) NSString *status;
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@end
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@implementation AVPlayerItem
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@end
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@interface ViewController ()
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@property(nonatomic, strong) NSMutableArray *avPlayerItems;
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@property(nonatomic, strong) NSMutableArray *playLists;
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@end
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@implementation ViewController
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- (void)viewDidLoad {
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[super viewDidLoad];
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// AVPlayerItemの配列とPlaylistの配列生成
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self.avPlayerItems = [NSMutableArray array];
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self.playLists = [NSMutableArray array];
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for (int i = 0; i < 10; i++) {
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AVPlayerItem *avPlayerItem = [[AVPlayerItem alloc] init];
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[self.avPlayerItems addObject:avPlayerItem];
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NSString *playList = [NSString stringWithFormat:@"Title%02d",i];
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[self.playLists addObject:playList];
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}
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// オブザーバー設定
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for (int i = 0; i < 10; i++) {
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AVPlayerItem *avPlayerItem = self.avPlayerItems[i];
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[avPlayerItem addObserver:self
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forKeyPath:@"status"
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options:NSKeyValueObservingOptionInitial
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context:nil];
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}
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// 再生中の曲が切り替わるのをタイマーで擬似
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[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(playNext) userInfo:nil repeats:true];
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}
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-(void)playNext {
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static int index = 0;
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AVPlayerItem *avPlayerItem = self.avPlayerItems[index];
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avPlayerItem.status = @"ready";
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index++;
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index %= self.avPlayerItems.count;
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}
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// 再生中の曲が変わった時にタイトルを表示
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-(void)observeValueForKeyPath:(NSString *)keyPath
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ofObject:(id)object
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change:(NSDictionary *)change
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context:(void *)context {
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if ([NSStringFromClass([object class]) isEqualToString:@"AVPlayerItem"]) {
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if ([keyPath isEqualToString:@"status"]) {
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AVPlayerItem *objItemNow = object;
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NSUInteger index = [self.avPlayerItems indexOfObject:objItemNow];
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if (index != NSNotFound) {
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NSLog(@"Now Playing title: %@",self.playLists[index]);
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} else {
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NSLog(@"AVPlayerItem Not Found");
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}
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}
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}
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}
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@end
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```
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