83 lines
2.8 KiB
Objective-C
83 lines
2.8 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTPhotoLibraryImageLoader.h"
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#import <Photos/Photos.h>
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#import "RCTImageUtils.h"
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#import "RCTUtils.h"
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@implementation RCTPhotoLibraryImageLoader
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RCT_EXPORT_MODULE()
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@synthesize bridge = _bridge;
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#pragma mark - RCTImageLoader
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- (BOOL)canLoadImageURL:(NSURL *)requestURL
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{
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return [requestURL.scheme.lowercaseString isEqualToString:@"ph"];
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}
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- (RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL size:(CGSize)size scale:(CGFloat)scale resizeMode:(UIViewContentMode)resizeMode progressHandler:(RCTImageLoaderProgressBlock)progressHandler completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
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{
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// Using PhotoKit for iOS 8+
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// The 'ph://' prefix is used by FBMediaKit to differentiate between
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// assets-library. It is prepended to the local ID so that it is in the
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// form of an, NSURL which is what assets-library uses.
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NSString *phAssetID = [imageURL.absoluteString substringFromIndex:[@"ph://" length]];
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PHFetchResult *results = [PHAsset fetchAssetsWithLocalIdentifiers:@[phAssetID] options:nil];
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if (results.count == 0) {
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NSString *errorText = [NSString stringWithFormat:@"Failed to fetch PHAsset with local identifier %@ with no error message.", phAssetID];
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NSError *error = RCTErrorWithMessage(errorText);
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completionHandler(error, nil);
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return ^{};
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}
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PHAsset *asset = [results firstObject];
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PHImageRequestOptions *imageOptions = [PHImageRequestOptions new];
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imageOptions.progressHandler = ^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
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static const double multiplier = 1e6;
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progressHandler(progress * multiplier, multiplier);
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};
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BOOL useMaximumSize = CGSizeEqualToSize(size, CGSizeZero);
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CGSize targetSize;
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if (useMaximumSize) {
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targetSize = PHImageManagerMaximumSize;
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imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
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} else {
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targetSize = size;
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imageOptions.resizeMode = PHImageRequestOptionsResizeModeFast;
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}
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PHImageContentMode contentMode = PHImageContentModeAspectFill;
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if (resizeMode == UIViewContentModeScaleAspectFit) {
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contentMode = PHImageContentModeAspectFit;
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}
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PHImageRequestID requestID = [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:targetSize contentMode:contentMode options:imageOptions resultHandler:^(UIImage *result, NSDictionary *info) {
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if (result) {
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completionHandler(nil, result);
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} else {
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completionHandler(info[PHImageErrorKey], nil);
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}
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}];
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return ^{
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[[PHImageManager defaultManager] cancelImageRequest:requestID];
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};
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}
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@end
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