在 iPad 模拟器上获取照片时, 在代理方法中

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
     NSLog{@“info = %@“, info};

}

得到的info 字典里面没UIImagePickerControllerOriginalImage 和 UIImagePickerControllerEditedImage, 需要使用另外的方式获得图片

+(UIImage *) loadImageFromAssertByUrl:(NSURL *)url completion:(void (^)(UIImage*)) completion{

    __block UIImage* img;

    ALAssetsLibrary *assetLibrary=[[ALAssetsLibrary alloc] init];

    [assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {
        ALAssetRepresentation *rep = [asset defaultRepresentation];
        Byte *buffer = (Byte*)malloc(rep.size);
        NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:nil];
        NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];
        img = [UIImage imageWithData:data];
        completion(img);

        NSLog(@"img ::: %@", img);
    } failureBlock:^(NSError *err) {
        NSLog(@"Error: %@",[err localizedDescription]);
    }];

    return img;
}

传入的 Url 为[info objectForKey: UIImagePickerControllerReferenceURL]的值.