Fix iOS speed

Author: creativecreatorormaybenot

packages/video_player/video_player/ios/Classes/FLTVideoPlayerPlugin.m

@@ -360,34 +360,27 @@ - (void)setVolume:(double)volume {
 }
 
 - (void)setPlaybackSpeed:(double)speed {
-  if (speed > 2.0 || speed < 0.0) {
+  // See https://developer.apple.com/library/archive/qa/qa1772/_index.html for an explanation of
+  // these checks.
+  if (speed > 2.0 && !_player.currentItem.canPlayFastForward) {
     if (_eventSink != nil) {
       _eventSink([FlutterError errorWithCode:@"VideoError"
-                                     message:@"Playback speed out of range (0 < speed <= 2)"
+                                     message:@"Video cannot be fast-forwarded beyond 2.0x"
                                      details:nil]);
     }
     return;
   }
 
-  if (speed == 1.0 || speed == 0.0 || (speed > 1.0 && _player.currentItem.canPlayFastForward) ||
-      (speed < 1.0 && _player.currentItem.canPlaySlowForward)) {
-    _player.rate = speed;
-    return;
-  }
-
-  if (speed > 1.0) {
-    if (_eventSink != nil) {
-      _eventSink([FlutterError errorWithCode:@"VideoError"
-                                     message:@"Video cannot be fast-forwarded"
-                                     details:nil]);
-    }
-  } else {
+  if (speed < 1.0 && !_player.currentItem.canPlaySlowForward) {
     if (_eventSink != nil) {
       _eventSink([FlutterError errorWithCode:@"VideoError"
                                      message:@"Video cannot be slow-forwarded"
                                      details:nil]);
     }
+    return;
   }
+
+  _player.rate = speed;
 }
 
 - (CVPixelBufferRef)copyPixelBuffer {

packages/video_player/video_player/lib/video_player.dart

@@ -482,10 +482,10 @@ class VideoPlayerController extends ValueNotifier<VideoPlayerValue> {
   /// * On web, no exceptions will be thrown, however, different browser
   ///   implementations will e.g. mute audio.
   ///   "Gecko mutes the sound outside the range `0.25` to `5.0`" (see https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/playbackRate).
-  /// * On iOS, you can never go above `2.0` playback speed on any video,
-  ///   however, errors will be thrown for all unsupported options. It is also
-  ///   possible that your specific video cannot be fast-forwarded or slowed
-  ///   down, in which cases the plugin also reports errors.
+  /// * On iOS, you can sometimes not go above `2.0` playback speed on a video.
+  ///   An error will be thrown for if the option is unsupported. It is also
+  ///   possible that your specific video cannot be slowed down, in which case
+  ///   the plugin also reports errors.
   /// * On Android, the handling is similar to web, where the plugin will not
   ///   report any errors, however, you cannot expect support for all speed
   ///   values (even though it should go way above `2.0`).