Scaled live iPhone Camera view in center, “CGAffineTransformTranslate” not working

Question

I have a little problem which I could not solve. I really hope someone can help me with that. I wanted to resize the live camera view and place it in the center, using the f

Answer 1

I got solution. It must be set on message:

- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated

Sample code:

#pragma mark -
#pragma mark UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{   
    CGFloat width = [[self view] bounds].size.width;
    CGFloat height = width/4*3;
    CGSize sizeOfCamera = CGSizeMake(width, height);
    CGAffineTransform t = CGAffineTransformMakeScale(0.5, 0.5);
    [picker setCameraViewTransform:t];

    // Now the image is automatically aligned to center.
    // Translation matrix also can be applied, but didn't use because it's already aligned to center.
}

Answer 2

I was in the same boat. What I did was physically move the picker frame.

[picker.view setFrame:CGRectMake(xOffset,yOffset,picker.view.frame.size.width,picker.view.frame.size.height)];

Answer 3

I've been banging my head against the same problem. I have confirmed that scaling and rotating the preview works, but translations appear to be ignored. I would speculate that the tx, ty portions of the CGAffineTransform are being ignored when the transform is set. This is with iPhone OS v3.1.2. I don't have other OS versions to test against right now.