title: How to convert PHAsset to PHLivePhoto
body: <p>I have <code>PHAsset</code> and I want to get <code>PHLivePhoto</code>.</p>
  
  <p><code>PHAsset</code> is <code>PHLivePhoto</code>'s asset.</p>
  
  <p>I know this Function.</p>
  
  <pre><code>/// Requests a Live Photo from the given resource URLs. The result handler will be called multiple times to deliver new PHLivePhoto instances with increasingly more content. If a placeholder image is provided, the result handler will first be invoked synchronously to deliver a live photo containing only the placeholder image. Subsequent invocations of the result handler will occur on the main queue.
  //  The targetSize and contentMode parameters are used to resize the live photo content if needed. If targetSize is equal to CGRectZero, content will not be resized.
  //  When using this method to provide content for a PHLivePhotoView, each live photo instance delivered via the result handler should be passed to -     [PHLivePhotoView setLivePhoto:].
  + (PHLivePhotoRequestID)requestLivePhotoWithResourceFileURLs:(NSArray&lt;NSURL *&gt; *)fileURLs placeholderImage:(UIImage *__nullable)image targetSize:(CGSize)targetSize contentMode:(PHImageContentMode)contentMode resultHandler:(void(^)(PHLivePhoto *__nullable livePhoto, NSDictionary *info))resultHandler;
  </code></pre>
  
  <p>But I don't know use.</p>
  
  <p>How to convert?</p>