从相册中取出gif图片

最新推荐文章于 2025-06-11 09:48:22 发布

转载最新推荐文章于 2025-06-11 09:48:22 发布 · 954 阅读

本文介绍了一种在iOS应用中从相册选择图片并进行处理的方法。通过使用ALAssetsLibrary和UIImagePickerController,实现了获取选中图片的URL，进一步加载ALAsset并获取其默认表示形式以读取图像数据，最后保存到指定路径。

NSURL *imageRefURL = [info valueForKey:UIImagePickerControllerReferenceURL];

                    ALAssetsLibrary* assetLibrary = [[ALAssetsLibrary alloc] init];
                    void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *) = ^(ALAsset *asset) {

                        if (asset != nil) {

                            [[NSFileManager defaultManager] removeItemAtPath:[PaiKeUnity getPrevImgPath] error:nil];

                            ALAssetRepresentation *rep = [asset defaultRepresentation];
                            Byte *imageBuffer = (Byte*)malloc(rep.size);
                            NSUInteger bufferSize = [rep getBytes:imageBuffer fromOffset:0.0 length:rep.size error:nil];
                            NSData *imageData = [NSData dataWithBytesNoCopy:imageBuffer length:bufferSize freeWhenDone:YES];
                            [imageData writeToFile:[PaiKeUnity getPrevImgPath] atomically:YES];

                            [self setPrevImage];
                        }
                        else {
                        }
                    };

                    [assetLibrary assetForURL:imageRefURL
                                  resultBlock:ALAssetsLibraryAssetForURLResultBlock
                                 failureBlock:^(NSError *error){
                                 }];
                    [assetLibrary release];