异步加载从UIImagePickerController相机拍摄的照片

Question

Initially, I thought I could use UIImagePickerControllerReferenceURL to obtain the ALAsset , then use that to generate an aspectRatioThumbnail and load the ALAsset asynchronously using GCD. However it appears that taking a photo from the UIImagePickerController doesn't produce an ALAsset as it's not stored in the photo library, only in memory.

I'd still like to somehow produce an ALAsset so I can access the aspectRatioThumbnail and load it the same way I am with the UIImagePickterController photo library. Is it possible to do this without saving the photo to the photo library?

Otherwise is there any other good ways to accomplish this outside of using ALAsset ?

Answer 1

Here is how to do it, doesn't really make sense to make a thumbnail because it'll prob cost too much in performance to do it:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self dismissModalViewControllerAnimated:YES];
    self.photoImageView.image = nil;
    [self.activityIndicatorView startAnimating];

    dispatch_async(dispatch_get_global_queue(0, 0), ^
    {
        UIImage *image = [[info objectForKey:@"UIImagePickerControllerOriginalImage"] retain];
        dispatch_async(dispatch_get_main_queue(), ^
        {
            self.photoImageView.image = image;
            [self.activityIndicatorView stopAnimating];
            [image release];
        });

    });
}