Wednesday 11 December 2013

Jogendra Singh

Resize UIImage by keeping Aspect ratio and width

The method of Srikar works very well, if you know both height and width of your new Size. If you for example know only the width you want to scale to and don't care about the height you first have to calculate the scale factor of the height.
+(UIImage*)imageWithImage: (UIImage*) sourceImage scaledToWidth: (float) i_width
    float oldWidth = sourceImage.size.width;
    float scaleFactor = i_width / oldWidth;

    float newHeight = sourceImage.size.height * scaleFactor;
    float newWidth = oldWidth * scaleFactor;

    UIGraphicsBeginImageContext(CGSizeMake(newWidth, newHeight));
    [sourceImage drawInRect:CGRectMake(0, 0, newWidth, newHeight)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    
    return newImage;

Jogendra Singh

About Jogendra Singh -

I'm Founder of Jogendra.Com. I love to share my bright ideas with the whole blogging community. I'm a good iPhone Application Developer. Apart from Blogging, I love to play Cricket and mobile games (Clash of clans).

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