react-native/Libraries/Image/RCTLocalAssetImageLoader.m

117 lines
3.3 KiB
Objective-C

/**
* 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 "RCTLocalAssetImageLoader.h"
#import <libkern/OSAtomic.h>
#import "RCTUtils.h"
@implementation RCTLocalAssetImageLoader
RCT_EXPORT_MODULE()
- (BOOL)canLoadImageURL:(NSURL *)requestURL
{
return RCTIsLocalAssetURL(requestURL);
}
- (BOOL)requiresScheduling
{
// Don't schedule this loader on the URL queue so we can load the
// local assets synchronously to avoid flickers.
return NO;
}
- (BOOL)shouldCacheLoadedImages
{
// UIImage imageNamed handles the caching automatically so we don't want
// to add it to the image cache.
return NO;
}
static NSString *bundleName(NSBundle *bundle)
{
NSString *name = bundle.infoDictionary[@"CFBundleName"];
if (!name) {
name = [[bundle.bundlePath lastPathComponent] stringByDeletingPathExtension];
}
return name;
}
static NSBundle *bundleForPath(NSString *key)
{
static NSMutableDictionary *bundleCache;
if (!bundleCache) {
bundleCache = [NSMutableDictionary new];
bundleCache[@"main"] = [NSBundle mainBundle];
// Initialize every bundle in the array
for (NSString *path in [[NSBundle mainBundle] pathsForResourcesOfType:@"bundle" inDirectory:nil]) {
[NSBundle bundleWithPath:path];
}
// The bundles initialized above will now also be in `allBundles`
for (NSBundle *bundle in [NSBundle allBundles]) {
bundleCache[bundleName(bundle)] = bundle;
}
}
return bundleCache[key];
}
- (RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL
size:(CGSize)size
scale:(CGFloat)scale
resizeMode:(RCTResizeMode)resizeMode
progressHandler:(RCTImageLoaderProgressBlock)progressHandler
completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
{
__block volatile uint32_t cancelled = 0;
RCTExecuteOnMainQueue(^{
if (cancelled) {
return;
}
NSString *imageName = RCTBundlePathForURL(imageURL);
NSBundle *bundle;
NSArray *imagePathComponents = [imageName pathComponents];
if ([imagePathComponents count] > 1 &&
[[[imagePathComponents firstObject] pathExtension] isEqualToString:@"bundle"]) {
NSString *bundlePath = [imagePathComponents firstObject];
bundle = bundleForPath([bundlePath stringByDeletingPathExtension]);
imageName = [imageName substringFromIndex:(bundlePath.length + 1)];
}
UIImage *image;
if (bundle) {
image = [UIImage imageNamed:imageName inBundle:bundle compatibleWithTraitCollection:nil];
} else {
image = [UIImage imageNamed:imageName];
}
if (image) {
if (progressHandler) {
progressHandler(1, 1);
}
completionHandler(nil, image);
} else {
NSString *message = [NSString stringWithFormat:@"Could not find image named %@", imageName];
completionHandler(RCTErrorWithMessage(message), nil);
}
});
return ^{
OSAtomicOr32Barrier(1, &cancelled);
};
}
@end