react-native/Libraries/CameraRoll/RCTPhotoLibraryImageLoader.m

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/**
* 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 <Photos/Photos.h>
#import "RCTImageUtils.h"
#import "RCTUtils.h"
@implementation RCTPhotoLibraryImageLoader
RCT_EXPORT_MODULE()
@synthesize bridge = _bridge;
#pragma mark - RCTImageLoader
- (BOOL)canLoadImageURL:(NSURL *)requestURL
{
return [requestURL.scheme caseInsensitiveCompare:@"ph"] == NSOrderedSame;
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}
- (RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL
size:(CGSize)size
scale:(CGFloat)scale
resizeMode:(RCTResizeMode)resizeMode
progressHandler:(RCTImageLoaderProgressBlock)progressHandler
completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
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{
// 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 *phAssetID = [imageURL.absoluteString substringFromIndex:@"ph://".length];
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PHFetchResult *results = [PHAsset fetchAssetsWithLocalIdentifiers:@[phAssetID] options:nil];
if (results.count == 0) {
NSString *errorText = [NSString stringWithFormat:@"Failed to fetch PHAsset with local identifier %@ with no error message.", phAssetID];
completionHandler(RCTErrorWithMessage(errorText), nil);
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return ^{};
}
PHAsset *asset = [results firstObject];
PHImageRequestOptions *imageOptions = [PHImageRequestOptions new];
if (progressHandler) {
imageOptions.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary<NSString *, id> *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;
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BOOL useMaximumSize = CGSizeEqualToSize(size, CGSizeZero);
CGSize targetSize;
if (useMaximumSize) {
targetSize = PHImageManagerMaximumSize;
imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
} else {
targetSize = size;
imageOptions.resizeMode = PHImageRequestOptionsResizeModeFast;
}
PHImageContentMode contentMode = PHImageContentModeAspectFill;
if (resizeMode == RCTResizeModeContain) {
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contentMode = PHImageContentModeAspectFit;
}
PHImageRequestID requestID =
[[PHImageManager defaultManager] requestImageForAsset:asset
targetSize:targetSize
contentMode:contentMode
options:imageOptions
resultHandler:^(UIImage *result, NSDictionary<NSString *, id> *info) {
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if (result) {
completionHandler(nil, result);
} else {
completionHandler(info[PHImageErrorKey], nil);
}
}];
return ^{
[[PHImageManager defaultManager] cancelImageRequest:requestID];
};
}
@end