Create an image using color and size supplied in arguments.

createImageWithColorAndSize.m

// get image color & size as parameters 
+ (UIImage *)imageWithColor:(UIColor *)color andSize:(CGSize)size
{
    UIImage *img = nil;
    // create rectangle/square of size supplied 
    CGRect rect = CGRectMake(0, 0, size.width, size.height);
    
    // create context of size supplied
    UIGraphicsBeginImageContext(rect.size);
    
    // get context reference 
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    // set fill color 
    CGContextSetFillColorWithColor(context,color.CGColor);
                                  
    // fill the color in context
    CGContextFillRect(context, rect);
    
    // create image from context
    img = UIGraphicsGetImageFromCurrentImageContext();
    
    // end context
    UIGraphicsEndImageContext();
    
    // return image
    return img;
}