[英]Spotify iOS SDK - No background play
我无法让Spotify iOS SDK使用后台播放功能,以便在手机锁定或应用程序不再处于活动状态时继续播放曲目。
我在我的Info.plist
设置了UIBackgroundModes
,如下所示:
<key>UIBackgroundModes</key>
<array>
<string>audio</string>
<string>fetch</string>
</array>
在应用程序中设置SDK时,还有其他我缺少的东西或我需要启用的东西吗?
在此先感谢您的帮助
为了解决这个问题,我不得不扩展我的类来实现SPTAudioStreamingPlaybackDelegate
并写入函数来激活和停用AVAudioSession
第1步
func audioStreaming(_ audioStreaming: SPTAudioStreamingController!, didChangePlaybackStatus isPlaying: Bool) {
if isPlaying {
self.activateAudioSession()
} else {
self.deactivateAudioSession()
}
}
第2步
// MARK: Activate audio session
func activateAudioSession() {
try? AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
try? AVAudioSession.sharedInstance().setActive(true)
}
// MARK: Deactivate audio session
func deactivateAudioSession() {
try? AVAudioSession.sharedInstance().setActive(false)
}
我想我之前在之前的一款应用程序中做过这件事。 认为您需要在应用启动后立即配置音频会话。
这里有一些代码说明如何做到这一点。 但它是用Objective C编写的。
- (void) initializeAudioSession
{
// Registers this class as the delegate of the audio session to listen for audio interruptions
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(audioRouteChanged:)
name: AVAudioSessionRouteChangeNotification
object: [AVAudioSession sharedInstance]];
//Set the audio category of this app to playback (allows music to play in background)
NSError *setCategoryError = nil;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategorySoloAmbient error: &setCategoryError];
if (setCategoryError) {
//RESPOND APPROPRIATELY
NSLog(@"AVAudioSession error: %@", setCategoryError);
}
// An instance of the audio player/manager is passed to the listener
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioRouteChanged:) name:AVAudioSessionRouteChangeNotification object:nil];
//Activate the audio session
NSError *activationError = nil;
[[AVAudioSession sharedInstance] setActive: YES error: &activationError];
if (activationError) {
//RESPOND APPROPRIATELY
NSLog(@"AVAudioSession error: %@", activationError);
}
}
#pragma mark -
#pragma mark Audio session callbacks
-(void)audioRouteChanged:(NSNotification*)audioChanged;
{
NSDictionary *userInfo = [audioChanged userInfo];
int routeChangeReason = (int)[userInfo objectForKey:AVAudioSessionRouteChangeReasonKey];
if ([SpotifyPlayer sharedPlayer].isPlaying) {
if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable)
{
[[SpotifyPlayer sharedPlayer] setIsPlaying:false callback:nil];
}
}
}
void audioRouteChangeListenerCallback (void *inUserData, AudioSessionPropertyID inPropertyID, UInt32 inPropertyValueSize, const void *inPropertyValue)
{
if (inPropertyID != kAudioSessionProperty_AudioRouteChange) return;
CFDictionaryRef routeChangeDictionary = inPropertyValue;
CFNumberRef routeChangeReasonRef = CFDictionaryGetValue (routeChangeDictionary, CFSTR (kAudioSession_AudioRouteChangeKey_Reason));
SInt32 routeChangeReason;
CFNumberGetValue (routeChangeReasonRef, kCFNumberSInt32Type, &routeChangeReason);
// "Old device unavailable" indicates that a headset was unplugged, or that the
// device was removed from a dock connector that supports audio output.
if (routeChangeReason == kAudioSessionRouteChangeReason_OldDeviceUnavailable)
{
[[SpotifyPlayer sharedPlayer] setIsPlaying:false callback:nil];
}
}
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