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Use ASPhotosImageRequest in ASMultiplexImageNode, in a backwards-compatible way

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This commit is contained in:
Adlai Holler
2015-09-25 15:41:35 -07:00
parent ee0c027ba6
commit bbf9550e08
5 changed files with 18 additions and 22 deletions
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32
AsyncDisplayKit/ASMultiplexImageNode.mm
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@@ -18,6 +18,7 @@
#import "ASBaseDefines.h"
#import "ASDisplayNode+Subclasses.h"
#import "ASLog.h"
#import "ASPhotosImageRequest.h"
#if !AS_IOS8_SDK_OR_LATER
#error ASMultiplexImageNode can be used on iOS 7, but must be linked against the iOS 8 SDK.
@@ -26,8 +27,6 @@
NSString *const ASMultiplexImageNodeErrorDomain = @"ASMultiplexImageNodeErrorDomain";
static NSString *const kAssetsLibraryURLScheme = @"assets-library";
static NSString *const kPHAssetURLScheme = @"ph";
static NSString *const kPHAssetURLPrefix = @"ph://";
/**
@abstract Signature for the block to be performed after an image has loaded.
@@ -120,14 +119,14 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
- (void)_loadALAssetWithIdentifier:(id)imageIdentifier URL:(NSURL *)assetURL completion:(void (^)(UIImage *image, NSError *error))completionBlock;
/**
@abstract Loads the image corresponding to the given assetURL from the Photos framework.
@abstract Loads the image corresponding to the given image request from the Photos framework.
@param imageIdentifier The identifier for the image to be loaded. May not be nil.
@param assetURL The photos framework URL (e.g., "ph://identifier") of the image to load, from PHAsset. May not be nil.
@param request The photos image request to load. May not be nil.
@param completionBlock The block to be performed when the image has been loaded, if possible. May not be nil.
@param image The image that was loaded. May be nil if no image could be downloaded.
@param error An error describing why the load failed, if it failed; nil otherwise.
*/
- (void)_loadPHAssetWithIdentifier:(id)imageIdentifier URL:(NSURL *)assetURL completion:(void (^)(UIImage *image, NSError *error))completionBlock;
- (void)_loadPHAssetWithRequest:(ASPhotosImageRequest *)request identifier:(id)imageIdentifier completion:(void (^)(UIImage *image, NSError *error))completionBlock;
/**
@abstract Downloads the image corresponding to the given imageIdentifier from the given URL.
@@ -456,8 +455,8 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
}];
}
// Likewise, if it's a iOS 8 Photo asset, we need to fetch it accordingly.
else if (AS_AT_LEAST_IOS8 && [[nextImageURL scheme] isEqualToString:kPHAssetURLScheme]) {
[self _loadPHAssetWithIdentifier:nextImageIdentifier URL:nextImageURL completion:^(UIImage *image, NSError *error) {
else if (ASPhotosImageRequest *request = nextImageURL.asyncdisplaykit_photosRequest) {
[self _loadPHAssetWithRequest:request identifier:nextImageIdentifier completion:^(UIImage *image, NSError *error) {
ASMultiplexImageNodeCLogDebug(@"[%p] Acquired next image (%@) from Photos Framework", weakSelf, nextImageIdentifier);
finishedLoadingBlock(image, nextImageIdentifier, error);
}];
@@ -511,17 +510,15 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
}];
}
- (void)_loadPHAssetWithIdentifier:(id)imageIdentifier URL:(NSURL *)assetURL completion:(void (^)(UIImage *image, NSError *error))completionBlock
- (void)_loadPHAssetWithRequest:(ASPhotosImageRequest *)request identifier:(id)imageIdentifier completion:(void (^)(UIImage *image, NSError *error))completionBlock
{
ASDisplayNodeAssert(AS_AT_LEAST_IOS8, @"PhotosKit is unavailable on iOS 7.");
ASDisplayNodeAssertNotNil(imageIdentifier, @"imageIdentifier is required");
ASDisplayNodeAssertNotNil(assetURL, @"assetURL is required");
ASDisplayNodeAssertNotNil(request, @"request is required");
ASDisplayNodeAssertNotNil(completionBlock, @"completionBlock is required");
// Get the PHAsset itself.
ASDisplayNodeAssertTrue([[assetURL absoluteString] hasPrefix:kPHAssetURLPrefix]);
NSString *assetIdentifier = [[assetURL absoluteString] substringFromIndex:[kPHAssetURLPrefix length]];
PHFetchResult *assetFetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetIdentifier] options:nil];
PHFetchResult *assetFetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:@[request.assetIdentifier] options:nil];
if ([assetFetchResult count] == 0) {
// Error.
completionBlock(nil, nil);
@@ -531,15 +528,10 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
// Get the best image we can.
PHAsset *imageAsset = [assetFetchResult firstObject];
PHImageRequestOptions *requestOptions = [[PHImageRequestOptions alloc] init];
requestOptions.version = PHImageRequestOptionsVersionCurrent;
requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
requestOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
[[PHImageManager defaultManager] requestImageForAsset:imageAsset
targetSize:CGSizeMake(2048.0, 2048.0) // Ideally we would use PHImageManagerMaximumSize and kill the options, but we get back nil when requesting images of video assets. rdar://18447788
contentMode:PHImageContentModeDefault
options:requestOptions
targetSize:request.targetSize
contentMode:request.contentMode
options:request.options
resultHandler:^(UIImage *image, NSDictionary *info) {
completionBlock(image, info[PHImageErrorKey]);
}];