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2026-03-26 07:04:05 +08:00 · 2015-03-10 19:11:28 -07:00
parent 83581cfe6b
commit fab5ec617d
71 changed files with 4353 additions and 82 deletions
--- a/Libraries/Image/RCTImageLoader.m
+++ b/Libraries/Image/RCTImageLoader.m
@@ -0,0 +1,98 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#import "RCTImageLoader.h"
+
+#import <AssetsLibrary/AssetsLibrary.h>
+#import <Photos/PHAsset.h>
+#import <Photos/PHFetchResult.h>
+#import <Photos/PHImageManager.h>
+#import <UIKit/UIKit.h>
+
+#import "RCTConvert.h"
+#import "RCTImageDownloader.h"
+#import "RCTLog.h"
+
+NSError *errorWithMessage(NSString *message) {
+  NSDictionary *errorInfo = @{NSLocalizedDescriptionKey: message};
+  NSError *error = [[NSError alloc] initWithDomain:RCTErrorDomain code:0 userInfo:errorInfo];
+  return error;
+}
+
+@implementation RCTImageLoader
+
+ (ALAssetsLibrary *)assetsLibrary
+{
+  static ALAssetsLibrary *assetsLibrary = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    assetsLibrary = [[ALAssetsLibrary alloc] init];
+  });
+  return assetsLibrary;
+}
+
+ (void)loadImageWithTag:(NSString *)imageTag callback:(void (^)(NSError *error, UIImage *image))callback
+{
+  if ([imageTag hasPrefix:@"assets-library"]) {
+    [[RCTImageLoader assetsLibrary] assetForURL:[NSURL URLWithString:imageTag] resultBlock:^(ALAsset *asset) {
+      if (asset) {
+        ALAssetRepresentation *representation = [asset defaultRepresentation];
+        ALAssetOrientation orientation = [representation orientation];
+        UIImage *image = [UIImage imageWithCGImage:[representation fullResolutionImage] scale:1.0f orientation:(UIImageOrientation)orientation];
+        callback(nil, image);
+      } else {
+        NSString *errorText = [NSString stringWithFormat:@"Failed to load asset at URL %@ with no error message.", imageTag];
+        NSError *error = errorWithMessage(errorText);
+        callback(error, nil);
+      }
+    } failureBlock:^(NSError *loadError) {
+      NSString *errorText = [NSString stringWithFormat:@"Failed to load asset at URL %@.\niOS Error: %@", imageTag, loadError];
+      NSError *error = errorWithMessage(errorText);
+      callback(error, nil);
+    }];
+  } else if ([imageTag hasPrefix:@"ph://"]) {
+    // Using PhotoKit for iOS 8+
+    // '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 NSURL which is what assets-library is based on.
+    // This means if we use any FB standard photo picker, we will get this prefix =(
+    NSString *phAssetID = [imageTag substringFromIndex:[@"ph://" length]];
+    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];
+      NSError *error = errorWithMessage(errorText);
+      callback(error, nil);
+      return;
+    }
+
+    PHAsset *asset = [results firstObject];
+    [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:nil resultHandler:^(UIImage *result, NSDictionary *info) {
+      if (result) {
+        callback(nil, result);
+      } else {
+        NSString *errorText = [NSString stringWithFormat:@"Failed to load PHAsset with local identifier %@ with no error message.", phAssetID];
+        NSError *error = errorWithMessage(errorText);
+        callback(error, nil);
+        return;
+      }
+    }];
+  } else if ([imageTag hasPrefix:@"http"]) {
+    NSURL *url = [NSURL URLWithString:imageTag];
+    if (!url) {
+      NSString *errorMessage = [NSString stringWithFormat:@"Invalid URL: %@", imageTag];
+      callback(errorWithMessage(errorMessage), nil);
+      return;
+    }
+    [[RCTImageDownloader sharedInstance] downloadDataForURL:url block:^(NSData *data, NSError *error) {
+      if (error) {
+        callback(error, nil);
+      } else {
+        callback(nil, [UIImage imageWithData:data]);
+      }
+    }];
+  } else {
+    NSString *errorMessage = [NSString stringWithFormat:@"Unrecognized tag protocol: %@", imageTag];
+    NSError *error = errorWithMessage(errorMessage);
+    callback(error, nil);
+  }
+}
+
+@end