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我試圖讓我的播客應用程序在鎖定屏幕上顯示內容，以及尊重播放/暫停控件。這裏是我的代碼：鎖定屏幕不尊重現在信息字典
- (void)playEpisodeAtIndex:(NSInteger)index {
_currentIndex = index;
TalkPodEpisode *episode = self.playlist[index];
self.player = [[AVPlayer alloc] initWithURL:episode.url];
[self.player play];
_playing = YES;
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
NSDictionary *lockScreenInfo = @{MPMediaItemPropertyTitle:self.currentEpisode.title,
MPMediaItemPropertyArtist: @"The Talk Pod",
MPNowPlayingInfoPropertyPlaybackRate:[NSNumber numberWithDouble:self.player.rate],
MPNowPlayingInfoPropertyElapsedPlaybackTime:[NSNumber numberWithDouble:[self currentPlaybackTime]]};
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = lockScreenInfo;
}
古怪的是，這裏發生了什麼：
- 響應和處理事件只是正常
- 藝術家和標題顯示在鎖屏
- 的進展滑塊顯示 - ： - ，並且沒有顯示播放進度
- 節目的持續時間也不會出現。
下面是代碼來獲得當前經過時間：
- (NSTimeInterval)currentPlaybackTime {
CMTime time = self.player.currentTime;
if (CMTIME_IS_VALID(time)) {
return time.value/time.timescale;
}
return 0;
}
下面是切換播放&暫停代碼：
- (void)playPause {
if (self.player) {
if (_playing) {
[self.player pause];
_playing = NO;
} else {
[self.player play];
_playing = YES;
}
NSMutableDictionary *lockScreenInfo = [[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo mutableCopy];
lockScreenInfo[MPNowPlayingInfoPropertyPlaybackRate] = [NSNumber numberWithDouble:self.player.rate];
lockScreenInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = [NSNumber numberWithDouble:[self currentPlaybackTime]];
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = lockScreenInfo;
}
}
任何人都知道如何解決這一問題？有什麼令我困惑的是，一些的東西出現在屏幕上，但當前的播放信息沒有。再次，接收和處理事件工作得很好。