/** * Copyright (c) 2015-present, Facebook, Inc. * All rights reserved. * * This source code is licensed under the BSD-style license found in the * LICENSE file in the root directory of this source tree. An additional grant * of patent rights can be found in the PATENTS file in the same directory. */ #import "RCTPhotoLibraryImageLoader.h" #import #import @implementation RCTPhotoLibraryImageLoader RCT_EXPORT_MODULE() @synthesize bridge = _bridge; #pragma mark - RCTImageLoader - (BOOL)canLoadImageURL:(NSURL *)requestURL { if (![PHAsset class]) { return NO; } return [requestURL.scheme caseInsensitiveCompare:@"assets-library"] == NSOrderedSame || [requestURL.scheme caseInsensitiveCompare:@"ph"] == NSOrderedSame; } - (RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL size:(CGSize)size scale:(CGFloat)scale resizeMode:(RCTResizeMode)resizeMode progressHandler:(RCTImageLoaderProgressBlock)progressHandler partialLoadHandler:(RCTImageLoaderPartialLoadBlock)partialLoadHandler completionHandler:(RCTImageLoaderCompletionBlock)completionHandler { // Using PhotoKit for iOS 8+ // The 'ph://' prefix is used by FBMediaKit to differentiate between // assets-library. It is prepended to the local ID so that it is in the // form of an, NSURL which is what assets-library uses. NSString *assetID = @""; PHFetchResult *results; if (!imageURL) { completionHandler(RCTErrorWithMessage(@"Cannot load a photo library asset with no URL"), nil); return ^{}; } else if ([imageURL.scheme caseInsensitiveCompare:@"assets-library"] == NSOrderedSame) { assetID = [imageURL absoluteString]; results = [PHAsset fetchAssetsWithALAssetURLs:@[imageURL] options:nil]; } else { assetID = [imageURL.absoluteString substringFromIndex:@"ph://".length]; results = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetID] options:nil]; } if (results.count == 0) { NSString *errorText = [NSString stringWithFormat:@"Failed to fetch PHAsset with local identifier %@ with no error message.", assetID]; completionHandler(RCTErrorWithMessage(errorText), nil); return ^{}; } PHAsset *asset = [results firstObject]; PHImageRequestOptions *imageOptions = [PHImageRequestOptions new]; // Allow PhotoKit to fetch images from iCloud imageOptions.networkAccessAllowed = YES; if (progressHandler) { imageOptions.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info) { static const double multiplier = 1e6; progressHandler(progress * multiplier, multiplier); }; } // Note: PhotoKit defaults to a deliveryMode of PHImageRequestOptionsDeliveryModeOpportunistic // which means it may call back multiple times - we probably don't want that imageOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; BOOL useMaximumSize = CGSizeEqualToSize(size, CGSizeZero); CGSize targetSize; if (useMaximumSize) { targetSize = PHImageManagerMaximumSize; imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone; } else { targetSize = CGSizeApplyAffineTransform(size, CGAffineTransformMakeScale(scale, scale)); imageOptions.resizeMode = PHImageRequestOptionsResizeModeFast; } PHImageContentMode contentMode = PHImageContentModeAspectFill; if (resizeMode == RCTResizeModeContain) { contentMode = PHImageContentModeAspectFit; } PHImageRequestID requestID = [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:targetSize contentMode:contentMode options:imageOptions resultHandler:^(UIImage *result, NSDictionary *info) { if (result) { completionHandler(nil, result); } else { completionHandler(info[PHImageErrorKey], nil); } }]; return ^{ [[PHImageManager defaultManager] cancelImageRequest:requestID]; }; } @end