JCTiledScrollView

JCTiledScrollView is a set of classes that wrap UIScrollView and CATiledLayer. The project to simplify displaying large images and PDFs at multiple zoom scales.

JCTiledScrollView was introduced during my CATiledLayer presentation at Melbourne CocoaHeads 2012. Video, Slides, Blog.

Features

• Display tiled bitmap images and single page PDFs with two separate classes
• Supports standard and high resolution displays
• You only need to provide one set of bitmap tiles; no need for @2x tiles
• A handy set of default UIGestureRecognizer actions and delegate callbacks
• Annotation support with an interface similar to MKMapView
• Demo code, example PNG tiles and PDF file included
• Supports iOS 8.0+

Installation

TODO

Handy Links

• Cut your large images into tiles with Tile-Cutter by Jeff La Marche
• Cut your images on the command line with my fork of Chris Miles’ experimental SliceTool program
• Shrink your bitmap tiles with Image Optim. It can half your tile size and improve performance greatly

Further Reading on CATiledLayer

• Subduing CATiledLayer by Matt Long (Cocoa is my Girlfriend)
• Apple Tech-Note Thread Safe UIKit Drawing (in iOS 4+) mentioned at WWDC 2010
• Tread safe objects in iOS4 UIGraphicsGetCurrentContext, UIImage, UIColor, UIFont
• Apple Documentation on Supporting High Resolution Screens
• Apple’s View Programming Guide for iOS
• WWDC 2010 Session 104 - Designing Apps with ScrollViews
• WWDC 2011 Session 104 - Advanced Scroll View Techniques
• CATiledLayer and JCTiledScrollView presentation at Melbourne CocoaHeads

Licence

The “Skipping Girl” image is copyright © 2012, Jesse Collis and licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

JCTiledScrollView is open-sourced software licensed under the MIT license.