Creating scrollable view

These are the steps for creating an application with scrollable view:
1. Create a scrollable view in the application

• use either interface builder or code to add a UIScrollView to the current window
• Sample code to add a scroll view:

            CGRect frame = [CGRectMake(0,0,200,200)];
            UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame:frame];

2. Add subviews (frames may extend beyond the above scroll view bounds)

• Sample code to add subview:

        UIImage* image = [UIImage withName: @"image.jpg"];  /// image.jpg need to be added to resource
             UIImageView imageView = [[UIImageView alloc] initWithImage:image];
             [scrollView addSubview: imageView];

3. Set the content size

• sample code to set content size:

             [scrollView setContentSize: [image size]];

4. Set the max zoom and min zoom, if zoom is needed

• sample code to set min and max zoom:

             [scrollView setMaximumZoomScale: 4.0];
             [scrollView setMinimumZoomScale: 0.1];

5. If zoom is needed, implement the ScrollView's viewForZoomingInScrollView delegate

• sample code for viewForZoomingInScrollView delegate:

             - (UIView *) viewForZoomingInScrollView: (UIScrollView *) scrollView  {
                       return imageView;
             }

6. Implement all the needed and optional delegate if neccessary.

• Implement scrollViewDidScroll delegate if need to respond to scroll event
• sample code:

                          - (void) scrollViewDidScroll: (UIScrollView *)scrollView  {
                              if (scrollView.contentOffset ...) {
                                      // do something here
                                }
                          }

• Set the scrollViewShouldScrollToTop delegate to change the behaviour
• sample code:

               - (BOOL) scrollViewShouldScrollToTop: (UIScrollView *) scrollView {
                         // return TRUE or FALSE, depending on view should scroll to top
               }

7. When the view is no more needed, to allow user to return to previous view, send the removeFromSuperview message to the viewController.

• sample code:

      [self.view removeFromSuperview];