Queue seek request until ready to play on iOS.

just_audio/darwin/Classes/AudioPlayer.m

@@ -672,6 +672,7 @@
         if ([statusNumber isKindOfClass:[NSNumber class]]) {
             status = statusNumber.intValue;
         }
+        [playerItem.audioSource onStatusChanged:status];
         switch (status) {
             case AVPlayerItemStatusReadyToPlay: {
                 if (playerItem != _player.currentItem) return;

just_audio/darwin/Classes/ClippingAudioSource.m

@@ -56,6 +56,8 @@
     if (!completionHandler || (self.playerItem.status == AVPlayerItemStatusReadyToPlay)) {
         CMTime absPosition = CMTimeAdd(_start, position);
         [_audioSource.playerItem seekToTime:absPosition toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:completionHandler];
+    } else {
+        [super seek:position completionHandler:completionHandler];
     }
 }
 

just_audio/darwin/Classes/IndexedAudioSource.m

@@ -4,15 +4,31 @@
 
 @implementation IndexedAudioSource {
     BOOL _isAttached;
+    CMTime _queuedSeekPos;
+    void (^_queuedSeekCompletionHandler)(BOOL);
 }
 
 - (instancetype)initWithId:(NSString *)sid {
     self = [super init];
     NSAssert(self, @"super init cannot be nil");
     _isAttached = NO;
+    _queuedSeekPos = kCMTimeInvalid;
+    _queuedSeekCompletionHandler = nil;
     return self;
 }
 
+- (void)onStatusChanged:(AVPlayerItemStatus)status {
+    if (status == AVPlayerItemStatusReadyToPlay) {
+        // This handles a pending seek during a load.
+        // TODO: Test seeking during a seek.
+        if (_queuedSeekCompletionHandler) {
+            [self seek:_queuedSeekPos completionHandler:_queuedSeekCompletionHandler];
+            _queuedSeekPos = kCMTimeInvalid;
+            _queuedSeekCompletionHandler = nil;
+        }
+    }
+}
+
 - (IndexedPlayerItem *)playerItem {
     return nil;
 }
@@ -48,6 +64,10 @@
 }
 
 - (void)seek:(CMTime)position completionHandler:(void (^)(BOOL))completionHandler {
+    if (completionHandler && (self.playerItem.status != AVPlayerItemStatusReadyToPlay)) {
+        _queuedSeekPos = position;
+        _queuedSeekCompletionHandler = completionHandler;
+    }
 }
 
 - (CMTime)duration {

just_audio/darwin/Classes/UriAudioSource.m

@@ -56,6 +56,8 @@
             position = CMTimeAdd(position, range.start);
         }
         [_playerItem seekToTime:position toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:completionHandler];
+    } else {
+        [super seek:position completionHandler:completionHandler];
     }
 }
 

just_audio/ios/Classes/IndexedAudioSource.h

@@ -11,6 +11,7 @@
 @property (readonly, nonatomic) CMTime bufferedPosition;
 @property (readonly, nonatomic) BOOL isAttached;
 
+- (void)onStatusChanged:(AVPlayerItemStatus)status;
 - (void)attach:(AVQueuePlayer *)player;
 - (void)play:(AVQueuePlayer *)player;
 - (void)pause:(AVQueuePlayer *)player;

just_audio/macos/Classes/IndexedAudioSource.h

@@ -11,6 +11,7 @@
 @property (readonly, nonatomic) CMTime bufferedPosition;
 @property (readonly, nonatomic) BOOL isAttached;
 
+- (void)onStatusChanged:(AVPlayerItemStatus)status;
 - (void)attach:(AVQueuePlayer *)player;
 - (void)play:(AVQueuePlayer *)player;
 - (void)pause:(AVQueuePlayer *)player;