blocks|key|4214068|text|首先，AVPlayer不显示任何白色屏幕，它的背景是白色的。所以，基本上你的AVPlayer启动得很晚。我猜您按了一个UIButton，然后它在AVPlayer中加载文件，然后立即开始播放它。这就是问题所在。AVPlayer可能需要一些时间来缓冲足够的数据并准备好播放该文件。使用KVO时，可以通知玩家状态的更改。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4214069|因此，首先需要禁用play按钮，加载AVPlayer并添加一个观察者：|4214070|play.enabled+=+NO;
player+=+[AVPlayer+playerWithURL:URL];
[player+addObserver:self+forKeyPath:@"status"+options:0+context:nil];+|code-block|syntax|javascript|4214071|检查AVPlayerStatusReadyToPlay后启用它|4214072|-+(void)observeValueForKeyPath:(NSString+*)keyPath+ofObject:(id)object
++++++++++++++++++++++++change:(NSDictionary+*)change+context:(void+*)context+{
++++if+(object+==+player+&&+[keyPath+isEqualToString:@"status"])+{
++++++++if+(player.status+==+AVPlayerStatusReadyToPlay)+{
++++++++++++play.enabled+=+YES;
++++++++}
++++}
}|4214073|entityMap^0|3|8|12|8|1N|8|20|8|2W|8|0|I|8|0|0|2|P|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|R|$]]

Firstly, <code>AVPlayer</code> doesn't show any white screen, its your background which is white. So, basically your <code>AVPlayer</code> is starting late. I guess you press a <code>UIButton</code> and then it loads the file in <code>AVPlayer</code> and immediately start playing it. Thats where the problem is. It may take some time for the <code>AVPlayer</code> to buffer enough data and be ready to play the file. Using KVO, it is possible to be notified for changes of the player status.

So first you need to disable the play button, load the <code>AVPlayer</code> and add an observer:

<pre><code>play.enabled = NO;
player = [AVPlayer playerWithURL:URL];
[player addObserver:self forKeyPath:@"status" options:0 context:nil]; 
</code></pre>

Then enable it after checking <code>AVPlayerStatusReadyToPlay</code>:

<pre><code>- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
 change:(NSDictionary *)change context:(void *)context {
 if (object == player &amp;&amp; [keyPath isEqualToString:@"status"]) {
 if (player.status == AVPlayerStatusReadyToPlay) {
 play.enabled = YES;
 }
 }
}
</code></pre>

blocks|key|4214082|text|布兰科斯是对的。AVPlayer需要时间来实现状态AVPlayerStatusReadyToPlay。因此，使用url初始化播放机，并且只在它是AVPlayerStatusReadyToPlay时才播放它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4214083|player+=+[AVPlayer+playerWithURL:URL];++
[player+addObserver:self+forKeyPath:@"status"+options:0+context:nil];+++

-+(void)observeValueForKeyPath:(NSString+*)keyPath+ofObject:(id)object
++++++++++++++++++++change:(NSDictionary+*)change+context:(void+*)context+++
{++
++++if+(object+==+player+&&+[keyPath+isEqualToString:@"status"])+{++
++++++++if+(player.status+==+AVPlayerStatusReadyToPlay)+{++
++++++++++++player.play()++
++++++++}++
++++}++
}|code-block|syntax|javascript|4214084|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Blancos is right. AVPlayer is taking time to achieve state AVPlayerStatusReadyToPlay.
So, initialize the player with url and play it only when it is AVPlayerStatusReadyToPlay.

<pre><code>player = [AVPlayer playerWithURL:URL]; 
[player addObserver:self forKeyPath:@"status" options:0 context:nil]; 

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
 change:(NSDictionary *)change context:(void *)context 
{ 
 if (object == player &amp;&amp; [keyPath isEqualToString:@"status"]) { 
 if (player.status == AVPlayerStatusReadyToPlay) { 
 player.play() 
 } 
 } 
}
</code></pre>

blocks|key|4707154|text|我也有同样的问题。为了避免添加KVO，我只是在url设置为这样的时候设置AVPlayer+.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4707155|var+urlToUse:+NSURL?
{
++++didSet
++++{
++++++++guard+let+urlToUse+=+urlToUse+else+{+return+}
++++++++replayPlayer+=+AVPlayer(URL:+urlToUse)
++++}
}|code-block|syntax|javascript|4707156|这样，AVPlayer状态就可以在需要时做好准备。|4707157|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had the same problem. To avoid adding a KVO, I just set the AVPlayer up when the url is set like so...

<pre><code>var urlToUse: NSURL?
{
 didSet
 {
 guard let urlToUse = urlToUse else { return }
 replayPlayer = AVPlayer(URL: urlToUse)
 }
}
</code></pre>

That way the AVPlayer status will be ready when needed.

blocks|key|818066|text|我知道这是个老生常谈的问题，但即使在正确地检测到AVPlayer何时准备播放时，我也会遇到同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|818067|我希望它能在图像上播放，这样在初始静态图像和移动视频之间就能顺利过渡。|818068|对我来说，的诀窍是用以下内容设置一个清晰的背景：|offset|length|style|BOLD|818069|AVPlayerViewController+*controller+=+[[AVPlayerViewController+alloc]+init];
[controller.view+setBackgroundColor:[UIColor+clearColor]];|code-block|syntax|javascript|818070|这样的话，如果我在玩家准备玩的时候切换它的可见性，我就不会看到一个黑白屏幕，因为这个播放器有一个清晰的背景，为一个平稳的过渡！|818071|entityMap^0|0|0|0|5|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@$F|V|G|W|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|X|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I know this is an old question, but I get the same issue even when properly detecting when the AVPlayer is ready to play.

I wanted it to play over an image so that there was a smooth transition between an initial static image, and then moving video.

The trick for me was to set a clear background with:

<pre><code>AVPlayerViewController *controller = [[AVPlayerViewController alloc] init];
[controller.view setBackgroundColor:[UIColor clearColor]];
</code></pre>

This way, if I toggle the visibility of the player when it's ready to play, I never see a black or white screen, because the player has a clear background, making for a smooth transition!

Every time, when I try to playing a megabyte video using <code>AVPlayer</code>, it initially shows a white screen for a second and then starts the video. 

Why is this happening if the video is already cached? Is there a way to stop this from happening, so that it goes straight to the video without displaying a white screen?

I tried using <code>AVPlayer</code>'s <code>isReady</code> to check the status of <code>AVPlayer</code> and play video only when it's ready, but it still displays the white screen.

Also every time when I try to get the video duration of the video that's about to play through <code>AVPlayer</code> I keep getting 0.0 seconds initially, so I am not able to add a timer to the video either because I can't get the video duration because it keeps displaying a white screen for a second.

How do I correctly use AVPlayer so it doesn't show white screen before playing video?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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每次，当我尝试使用AVPlayer播放一个兆字节的视频时，它最初会显示一个白色的屏幕，然后启动视频。如果视频已经被缓存，为什么会发生这种情况？有没有办法阻止这种情况发生，这样它就可以直接进入视频而不显示白色屏幕？我试着用AVPlayer的isReady来检查AVPlayer的状态，只在它准备好的时候播放视频，但是它仍然...

问如何正确使用AVPlayer，使其在播放视频之前不显示白屏幕？
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问如何正确使用AVPlayer，使其在播放视频之前不显示白屏幕？EN