107 lines
4.2 KiB
Objective-C
107 lines
4.2 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 "RCTImageLoader.h"
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#import <AssetsLibrary/AssetsLibrary.h>
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#import <Photos/PHAsset.h>
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#import <Photos/PHFetchResult.h>
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#import <Photos/PHImageManager.h>
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#import <UIKit/UIKit.h>
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#import "RCTConvert.h"
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#import "RCTImageDownloader.h"
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#import "RCTLog.h"
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NSError *errorWithMessage(NSString *message)
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{
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NSDictionary *errorInfo = @{NSLocalizedDescriptionKey: message};
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NSError *error = [[NSError alloc] initWithDomain:RCTErrorDomain code:0 userInfo:errorInfo];
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return error;
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}
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@implementation RCTImageLoader
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+ (ALAssetsLibrary *)assetsLibrary
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{
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static ALAssetsLibrary *assetsLibrary = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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assetsLibrary = [[ALAssetsLibrary alloc] init];
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});
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return assetsLibrary;
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}
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+ (void)loadImageWithTag:(NSString *)imageTag callback:(void (^)(NSError *error, UIImage *image))callback
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{
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if ([imageTag hasPrefix:@"assets-library"]) {
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[[RCTImageLoader assetsLibrary] assetForURL:[NSURL URLWithString:imageTag] resultBlock:^(ALAsset *asset) {
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if (asset) {
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ALAssetRepresentation *representation = [asset defaultRepresentation];
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ALAssetOrientation orientation = [representation orientation];
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UIImage *image = [UIImage imageWithCGImage:[representation fullResolutionImage] scale:1.0f orientation:(UIImageOrientation)orientation];
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callback(nil, image);
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} else {
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NSString *errorText = [NSString stringWithFormat:@"Failed to load asset at URL %@ with no error message.", imageTag];
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NSError *error = errorWithMessage(errorText);
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callback(error, nil);
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}
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} failureBlock:^(NSError *loadError) {
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NSString *errorText = [NSString stringWithFormat:@"Failed to load asset at URL %@.\niOS Error: %@", imageTag, loadError];
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NSError *error = errorWithMessage(errorText);
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callback(error, nil);
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}];
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} else if ([imageTag hasPrefix:@"ph://"]) {
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// Using PhotoKit for iOS 8+
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// 'ph://' prefix is used by FBMediaKit to differentiate between assets-library. It is prepended to the local ID so that it
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// is in the form of NSURL which is what assets-library is based on.
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// This means if we use any FB standard photo picker, we will get this prefix =(
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NSString *phAssetID = [imageTag 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 = errorWithMessage(errorText);
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callback(error, nil);
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return;
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}
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PHAsset *asset = [results firstObject];
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[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage *result, NSDictionary *info) {
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if (result) {
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callback(nil, result);
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} else {
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NSString *errorText = [NSString stringWithFormat:@"Failed to load PHAsset with local identifier %@ with no error message.", phAssetID];
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NSError *error = errorWithMessage(errorText);
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callback(error, nil);
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return;
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}
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}];
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} else if ([imageTag hasPrefix:@"http"]) {
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NSURL *url = [NSURL URLWithString:imageTag];
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if (!url) {
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NSString *errorMessage = [NSString stringWithFormat:@"Invalid URL: %@", imageTag];
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callback(errorWithMessage(errorMessage), nil);
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return;
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}
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[[RCTImageDownloader sharedInstance] downloadDataForURL:url block:^(NSData *data, NSError *error) {
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if (error) {
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callback(error, nil);
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} else {
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callback(nil, [UIImage imageWithData:data]);
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}
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}];
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} else {
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NSString *errorMessage = [NSString stringWithFormat:@"Unrecognized tag protocol: %@", imageTag];
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NSError *error = errorWithMessage(errorMessage);
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callback(error, nil);
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}
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}
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@end
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