UIImage Aspect Fit when using drawInRect?

Question

UIView provides for the \"aspect fit\" content mode. However, I\'ve subclasses UIView and would like to draw a UIImage using drawInRect with an aspect fit. Is there any way

Answer 1

here's the solution

CGSize imageSize = yourImage.size;
CGSize viewSize = CGSizeMake(450, 340); // size in which you want to draw

float hfactor = imageSize.width / viewSize.width;
float vfactor = imageSize.height / viewSize.height;

float factor = fmax(hfactor, vfactor);

// Divide the size by the greater of the vertical or horizontal shrinkage factor
float newWidth = imageSize.width / factor;
float newHeight = imageSize.height / factor;

CGRect newRect = CGRectMake(xOffset,yOffset, newWidth, newHeight);
[image drawInRect:newRect];

-- courtesy https://stackoverflow.com/a/1703210

another alternative for aspect fit

-(CGSize ) getImageSize :(CGSize )imgViewSize andActualImageSize:(CGSize )actualImageSize {

     // imgViewSize = size of view in which image is to be drawn
     // actualImageSize = size of image which is to be drawn

     CGSize drawImageSize;

     if (actualImageSize.height > actualImageSize.width) {

        drawImageSize.height = imgViewSize.height;
        drawImageSize.width = actualImageSize.width/actualImageSize.height * imgViewSize.height;

     }else {

        drawImageSize.width = imgViewSize.width;
        drawImageSize.height = imgViewSize.width * actualImageSize.height /  actualImageSize.width;
     }
     return drawImageSize;
}

Code for swift 3.0:

func getAspectFitFrame(sizeImgView:CGSize, sizeImage:CGSize) -> CGRect{

    let imageSize:CGSize  = sizeImage
    let viewSize:CGSize = sizeImgView

    let hfactor : CGFloat = imageSize.width/viewSize.width
    let vfactor : CGFloat = imageSize.height/viewSize.height

    let factor : CGFloat = max(hfactor, vfactor)

    // Divide the size by the greater of the vertical or horizontal shrinkage factor
    let newWidth : CGFloat = imageSize.width / factor
    let newHeight : CGFloat = imageSize.height / factor

    var x:CGFloat = 0.0
    var y:CGFloat = 0.0
    if newWidth > newHeight{
        y = (sizeImgView.height - newHeight)/2
    }
    if newHeight > newWidth{
        x = (sizeImgView.width - newWidth)/2
    }
    let newRect:CGRect = CGRect(x: x, y: y, width: newWidth, height: newHeight)

    return newRect

}