A traditional-style scrollbar for iOS that integrates with existing UIScrollView or UIScrollView subclasses.

WKScrollBar draws a persistent scrollbar handle on top of a UIScrollView. When tapped and dragged, WKScrollBar will scroll proportionately to its position on the screen. This comes in handy with apps which present long lists of items (UITextView, UITableView, AQGridView, etc), as it makes it easy to navigate to any point in a list.

Installing

Manually

Copy both WKVerticalScrollBar.h and WKVerticalScrollBar.m into your project. Make sure you've linked your project with QuartzCore.framework.

Usage

WKVerticalScrollBar is meant to integrate quickly with projects using UIScrollView or UIScrollView subclasses like AQGridView. Getting started is easy:

1. Create a WKVerticalScrollBar instance either in IB or in your -init method.
2. Add the WKVerticalScrollBar to the parent UIView, making sure that it is the frontmost UIView either by adding it last, or via -bringSubviewToFront:.
3. Size the WKVerticalScrollBar so that it takes up the same area as the UIScrollView that it will manage.
4. Tell WKVerticalScrollBar which UIScrollView it will manage via -setScrollView:.

Appearance

Modifying the look and feel of WKScrollBar can be done via the following methods:

• -setHandleColor:forState:

  Sets a color for UIControlStateNormal and UIControlStateSelected to control the normal and selected (finger down) colors of the handle.

  Defaults: UIControlStateNormal: 40% black, UIControlStateSelected: 60% black

• -setHandleWidth:

  Sets the width of the handle in the normal state.

  Default: 5pt.

• -setHandleSelectedWidth:

  Sets the width of the handle when selected. This allows you to grow the handle when the user's finger is over the handle.

  Default: 15pt.

• -setHandleHitArea:

  Sets the width of the hit area for the handle. This will allow your control to have a slightly larger hit area than what is visually presented. Apple's iOS Human Interface Guidelines suggest that this be 44pt.

  Default: 44pt.

• -setHandleMinimumHeight:

  Sets the minimum height of the handle.

  The height of the handle is calculated based upon the ratio of the contentOffset and the frame. If the contentOffset is too large, the handle may be too small to touch comfortably. Use this parameter to ensure that a minimum handle size is preserved.

• -setHandleCornerRadius: and -setHandleSelectedCornerRadius:

  Sets the corner radius of the handle in normal and selected mode.

Contributing

Anyone who would like to contribute to the project is more than welcome. Basically, there's just a few steps to getting started:

1. Fork this repo
2. Make your changes
3. Add yourself to the AUTHORS file and submit a pull request!

Copyright and License

WKVerticalScrollBar is Copyright (c) 2012 litl, LLC and licensed under the MIT license. See the LICENSE file for full details.