Problems loading and saving images from camera and camera roll. What am I doing wrong?

Question

I am building an app in which you can make pictures or pick an image from the camera roll and save these inside the app to be displayed in a tableview and detailview. The problem is that when I make a picture from inside the app and save it, the tableview and detailview get terribly slow as if the app is freezing. I also get this error ": CGAffineTransformInvert: singular matrix.". When I load a picture from the camera-rol that was not taken from inside my app, there is no problem and the app runs very smouthly.

This is the code for when I open the camera and camera roll:

-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{
if (buttonIndex == actionSheet.cancelButtonIndex) {
    return;
}

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = NO;

switch (buttonIndex) {
    case 0:
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        }
        break;
    case 1:
        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]) {
            picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        }
        break;
}

[self presentModalViewController:picker animated:YES];  
}

This is where I save it to the camera roll and put the image in an imageView:

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
UIImage *mijnImage;
if (CFStringCompare((__bridge_retained CFStringRef)mediaType, kUTTypeImage, 0)==kCFCompareEqualTo) {
    mijnImage = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];
    mijnPlaatje_.image = mijnImage;
    UIImageWriteToSavedPhotosAlbum(mijnImage, nil, nil, nil);

}

 [picker dismissModalViewControllerAnimated:YES]; 

}

And here I save the image inside my app:

-(IBAction)save:(id)sender{
drankjes.plaatje = [mijnPlaatje_ image];
[self dismissModalViewControllerAnimated:YES];

}

What am I doing wrong?

Answer 1

You need to use:

UIImageWriteToSavedPhotosAlbum(image, self, @selector(video:didFinishSavingWithError:contextInfo), nil)

and implement:

- (void)image:(UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo {
    NSLog(@"Saving image");
    if(error != nil) {
        NSLog(@"Error saving: %@",[error localizedDescription]);
    }
}

as Jensen2K says, didFinishSavingWithError is called even if there is no error so you can use it to tell when the save has finished.