Display Image In Fixed-Height ScrollView. If Image width is out of bound, user can scroll horizontally. If image width is less than bound, will sit in center. Display Image In Fixed-Height UIView. If image width is less than bound, will sit in center.

smartImageScaling

#pragma mark - UIImage
/*
 * ScrollView must use only TopLeft AutoResizing Option
 */
+ (void)displayImageInFixedHeightScrollView:(UIScrollView*)imgScrollView imageView:(UIImageView*)imageView image:(UIImage*)image
{
    
    CGSize finalSize = image.size;
    
    // Adjust ImageVieww Size
    if (imageView.bounds.size.width > image.size.width && imageView.bounds.size.height >= image.size.height) {
        
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        
    }else if(imageView.bounds.size.height < image.size.height){
        
        CGRect r = imageView.frame;
        r.size.width = imageView.frame.size.height*(image.size.width/image.size.height);//130*(512/340)
        imageView.frame = r;
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        
        finalSize = r.size;
        
    }
    
    // Adjust ScrollView Size
    CGSize rr = imgScrollView.contentSize;
    rr.width = finalSize.width <= imgScrollView.frame.size.width ? imgScrollView.frame.size.width : finalSize.width;
    imgScrollView.contentSize = rr;
    
    // put the ImageView in center if image.width is smaller than screenwidth
    float c = (imgScrollView.contentSize.width/2) - (finalSize.width/2); // set center point
    CGRect p = imageView.frame;
    p.origin.x = finalSize.width <= imgScrollView.frame.size.width-50  ? c : p.origin.x;    // above 270 width images are taking the full space already.
    imageView.frame = p;
    
    NSLog(@"imageFrame : W:%f / h:%f",image.size.width,image.size.height);
    NSLog(@"imageViewView : W:%f / h:%f",imageView.frame.size.width,imageView.frame.size.height);
}

+ (void)displayImageInFixedHeightView:(UIView*)view imageView:(UIImageView*)imageView image:(UIImage*)image
{
    
    CGSize finalSize = image.size;
    
    // Adjust ImageVieww Size
    if (imageView.bounds.size.width > image.size.width && imageView.bounds.size.height >= image.size.height) {
        
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        
    }else if(imageView.bounds.size.height < image.size.height){
        
        CGRect r = imageView.frame;
        r.size.width = imageView.frame.size.height*(image.size.width/image.size.height);//130*(512/340)
        imageView.frame = r;
        imageView.contentMode = UIViewContentModeScaleAspectFit;
        
        finalSize = r.size;
        
    }
    
    // put the ImageView in center if image.width is smaller than screenwidth
    float c = (view.frame.size.width/2) - (finalSize.width/2); // set center point
    CGRect p = imageView.frame;
    p.origin.x = finalSize.width <= view.frame.size.width-50  ? c : p.origin.x;    // above 270 width images are taking the full space already.
    imageView.frame = p;
    
    NSLog(@"imageFrame : W:%f / h:%f",image.size.width,image.size.height);
    NSLog(@"imageViewView : W:%f / h:%f",imageView.frame.size.width,imageView.frame.size.height);
}