UIImage drawInRect example ios

drawInRect:

Draws the entire image in the specified rectangle, scaling it as needed to fit.

- (void)drawInRect:(CGRect)rect

Parameters

rect

The rectangle (in the coordinate system of the graphics context) in which to draw the image.

Discussion of [UIImage drawInRect]

This method draws the entire image in the current graphics context, respecting the image’s orientation setting. In the default coordinate system, images are situated down and to the right of the origin of the specified rectangle. This method respects any transforms applied to the current graphics context, however.[UIImage drawInRect]

This method draws the image at full opacity using the kCGBlendModeNormal blend mode.

Example of [UIImage drawInRect]

- (UIImage *)imageScaledToSize:(CGSize)size
{
    //create drawing context
    UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);

    //draw
    [self drawInRect:CGRectMake(0.0f, 0.0f, size.width, size.height)];

    //capture resultant image
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //return image
    return image;
}

- (UIImage *)imageScaledToFitSize:(CGSize)size
{
    //calculate rect
    CGFloat aspect = self.size.width / self.size.height;
    if (size.width / aspect <= size.height)
    {
        return [self imageScaledToSize:CGSizeMake(size.width, size.width / aspect)];
    }
    else
    {
        return [self imageScaledToSize:CGSizeMake(size.height * aspect, size.height)];
    }
}