iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK

Resizing an Image

When images are being displayed, it is advisable to work with the smallest image possible while still maintaining a beautiful user interface. Although the sample app certainly could use the full-size selected image, performance will be affected if a larger image is used and there will be increased memory requirements to handle a larger image. Therefore, the sample app will resize a selected image to work with the image at the exact size needed for the user interface and no larger. To scale an image in iOS, the method will need to use Core Graphics. The sample app includes a category called Scaling on UIImage (in UIImage+Scaling), with a method called scaleImageToSize:. The method accepts a CGSize parameter, which is a width ...