Is it possible to resize the camera preview in iOS? - ios

Question

I'm trying to make the camera preview take up part of my view, rather than the entire screen. Is this even possible? Do I have to use something like the AV Foundation Framework to do this? I am new to iOS development, so any guidance would be greatly appreciated! Thanks!

Answer 1

Yes, you need to use AVFoundation for that. In the past some people (including myself) have tried to use UIImagePickerController instead (by replacing its view property with a custom view), but it doesn't work in iOS 7 (or at least will never work as you expect). Specifying a custom preview was never a documented feature of UIImagePickerController to begin with, so no big surprise.

Answer 2

Try this code to maintain your resultant image in same size. Its working well for me.
Step 1: First create IBOutlet for UIImageview.
Step 2: Add custom method into your imagePickerController.
-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = info[UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:YES completion:nil];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
OriginalImage=info[UIImagePickerControllerOriginalImage];
image = info[UIImagePickerControllerOriginalImage];
//------Additional method placed here----
imageview.image = image; // additional method
[self resizeImage];
//---------
if (_newMedia)
UIImageWriteToSavedPhotosAlbum(image,self,#selector(image:finishedSavingWithError:contextInfo:),nil);
}
else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
{
// Code here to support video if enabled
}
}
Step 3: Custom method to resize images on camera preview
//---- Resize the original image ----------------------
-(void)resizeImage
{
UIImage *resizeImage = imageview.image;
float width = 320;
float height = 320;
CGSize newSize = CGSizeMake(320,320);
UIGraphicsBeginImageContextWithOptions(newSize,NO,0.0);
CGRect rect = CGRectMake(0, 0, width, height);
float widthRatio = resizeImage.size.width / width;
float heightRatio = resizeImage.size.height / height;
float divisor = widthRatio > heightRatio ? widthRatio : heightRatio;
width = resizeImage.size.width / divisor;
height = resizeImage.size.height / divisor;
rect.size.width = width;
rect.size.height = height;
//indent in case of width or height difference
float offset = (width - height) / 2;
if (offset > 0) {
rect.origin.y = offset;
}
else {
rect.origin.x = -offset;
}
[resizeImage drawInRect: rect];
UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
imageview.image = smallImage;
imageview.contentMode = UIViewContentModeScaleAspectFit;
}