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Request and receive images in background queue

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Adlai Holler 2015-09-26 19:17:43 -07:00
parent ffa0829fc9
commit f6fe3b07d8
1 changed files with 27 additions and 23 deletions
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50
AsyncDisplayKit/ASMultiplexImageNode.mm
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@ -516,29 +516,33 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
ASDisplayNodeAssertNotNil(imageIdentifier, @"imageIdentifier is required"); ASDisplayNodeAssertNotNil(imageIdentifier, @"imageIdentifier is required");
ASDisplayNodeAssertNotNil(request, @"request is required"); ASDisplayNodeAssertNotNil(request, @"request is required");
ASDisplayNodeAssertNotNil(completionBlock, @"completionBlock is required"); ASDisplayNodeAssertNotNil(completionBlock, @"completionBlock is required");
// Get the PHAsset itself. // This is sometimes called on main but there's no reason to stay there
PHFetchResult *assetFetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:@[request.assetIdentifier] options:nil]; dispatch_async(dispatch_get_global_queue(QOS_CLASS_DEFAULT, 0), ^{
if ([assetFetchResult count] == 0) { // Get the PHAsset itself.
// Error. PHFetchResult *assetFetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:@[request.assetIdentifier] options:nil];
completionBlock(nil, nil); if ([assetFetchResult count] == 0) {
return; // Error.
} completionBlock(nil, nil);
return;
// Get the best image we can. }
PHAsset *imageAsset = [assetFetchResult firstObject];
PHImageRequestOptions *options = [request.options copy]; PHAsset *imageAsset = [assetFetchResult firstObject];
if (options.deliveryMode == PHImageRequestOptionsDeliveryModeOpportunistic) { PHImageRequestOptions *options = [request.options copy];
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; if (options.deliveryMode == PHImageRequestOptionsDeliveryModeHighQualityFormat) {
} // Without this flag the result will be delivered on the main queue, which is pointless
// But synchronous -> HighQualityFormat so we only use it if high quality format is specified
[[PHImageManager defaultManager] requestImageForAsset:imageAsset options.synchronous = YES;
targetSize:request.targetSize }
contentMode:request.contentMode
options:options [[PHImageManager defaultManager] requestImageForAsset:imageAsset
resultHandler:^(UIImage *image, NSDictionary *info) { targetSize:request.targetSize
completionBlock(image, info[PHImageErrorKey]); contentMode:request.contentMode
}]; options:options
resultHandler:^(UIImage *image, NSDictionary *info) {
completionBlock(image, info[PHImageErrorKey]);
}];
});
} }
- (void)_fetchImageWithIdentifierFromCache:(id)imageIdentifier URL:(NSURL *)imageURL completion:(void (^)(UIImage *image))completionBlock - (void)_fetchImageWithIdentifierFromCache:(id)imageIdentifier URL:(NSURL *)imageURL completion:(void (^)(UIImage *image))completionBlock