Merge Two Image on to one Image programmatically in iphone

Question

Hello I am developing the application which requires to merge two Image , My image size are 320*240 by merging both Image I want the size to be 320 * 480 . How can i do this

Answer 1

 UIImage *Image1 = [[UIImage alloc] initWithData:data]; 
 UIImage *Image2 = [[UIImage alloc] initWithData:data]; 
 // Set up width height with values.
        CGSize newSize = CGSizeMake(width, height);
        UIGraphicsBeginImageContext( newSize );

        [Image1 drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

        [Image2 drawInRect:CGRectMake(newSize.width,newSize.height,newSize.width,newSize.height*2) blendMode:kCGBlendModeNormal alpha:1.0];

        UIImage *mergedImage = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();