Question

In an iPhone app, I wrote some code to resize an image taken from the photo album, in order to use it as background for the app.
The code is strongly inspired from what I could find looking on the net. Namely here:
http://forrst.com/posts/UIImage_simple_resize_and_crop_image-sUG#comment-land
It works fine on the simulator. But it looks like no resizing at all is happening on the device. Why is that? Any idea?

Thank you for any tip.

Answer 1

hi Michel.

i dont know more about your code but i am using this code you can try
this you will find your solution.

here you need to pass image and the required width and height for
that image in this function and you will get another image with that
new size.

 -(UIImage *)resizeImage:(UIImage *)image3 width:(int)width height:(int)height {

        CGImageRef imageRef = [image3 CGImage];
        CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);

        //if (alphaInfo == kCGImageAlphaNone)
        alphaInfo = kCGImageAlphaNoneSkipLast;

        CGContextRef bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), 4 * width, CGImageGetColorSpace(imageRef), alphaInfo);
        CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
        CGImageRef ref = CGBitmapContextCreateImage(bitmap);
        UIImage *result = [UIImage imageWithCGImage:ref];

        CGContextRelease(bitmap);
        CGImageRelease(ref);

        return result;  

    }