UIImage resize aspect fill and crop

Question

I have this code, I take a photo with this size 2448x3264 and i need resize and adjust to display of screen at the top left. sorry for my english thanks

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

    imagenUsr = [info objectForKey:UIImagePickerControllerOriginalImage];

    NSLog(@"%f",imagenUsr.size.height);   //2448px
    NSLog(@"%f",imagenUsr.size.width);   //3264px


}

I need adjust to 320x568 aspect to fill at the top and left of the image taken

Answer 1

Try this:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    imagenUsr = [info objectForKey:UIImagePickerControllerOriginalImage];
    double width = imagenUsr.size.width;
    double height = imagenUsr.size.height;
    double screenWidth = self.view.frame.size.width;
    double apect = width/height;
    double nHeight = screenWidth/ apect;
    self.imgView.frame = CGRectMake(0, 0, screenWidth, nHeight);
    self.imgView.center = self.view.center;
    self.imgView.image = imagenUsr;
}

This will help you keeping the aspect ratio as before.

Another way would be:

self.imgView.contentMode = UIViewContentModeScaleAspectFit;
self.imgView.image = imagenUsr;

Hope this helps.. :)

Answer 2

Swift 3.0 / 4.0

AspectFill image cropping/Resizing... according to UIImageview Frame Size.

    func ResizeImage(with image: UIImage?, scaledToFill size: CGSize) -> UIImage? {
    let scale: CGFloat = max(size.width / (image?.size.width ?? 0.0), size.height / (image?.size.height ?? 0.0))
    let width: CGFloat = (image?.size.width ?? 0.0) * scale
    let height: CGFloat = (image?.size.height ?? 0.0) * scale
    let imageRect = CGRect(x: (size.width - width) / 2.0, y: (size.height - height) / 2.0, width: width, height: height)
    UIGraphicsBeginImageContextWithOptions(size, false, 0)
    image?.draw(in: imageRect)
    let newImage: UIImage? = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage
}