![]() This publication is protected by copyright, and permission must be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. Corporate and Government Sales (800) For sales outside the United States, please contact: International Sales Visit us on the Web: /aw All rights reserved. For more information, please contact: U.S. The publisher offers excellent discounts on this book when ordered in quantity for bulk purchases or special sales, which may include electronic versions and/or custom covers and content particular to your business, training goals, marketing focus, and branding interests. No liability is assumed for incidental or consequential damages in connection with or arising out of the use of the information or programs contained herein. The author and publisher have taken care in the preparation of this book, but make no expressed or implied warranty of any kind and assume no responsibility for errors or omissions. Where those designations appear in this book, and the publisher was aware of a trademark claim, the designations have been printed with initial capital letters or in all capitals. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Make sure to connect with us! /socialconnectĤ ios UICollectionView: The Complete Guide Second Edition Ash Furrow Upper Saddle River, NJ Boston Indianapolis San Francisco New York Toronto Montreal London Munich Paris Madrid Cape Town Sydney Tokyo Singapore Mexico Cityĥ ios UICollectionView: The Complete Guide, Second Edition Copyright 2014 by Pearson Education, Inc. When you complete one of these titles, you ll have all the information and code you will need to build that feature into your own mobile application. Each topic is covered in as much detail as possible with plenty of visual examples, tips, and step-by-step instructions. ![]() The sample code in each title is downloadable and can be used in your own projects. The Addison-Wesley Mobile Programming Series is a collection of digital-only programming guides that explore key mobile programming features and topics in-depth. Anyone is welcome to contribute to the project and add issues.ĭon’t forget to star and share the repo if you found it useful.3 Addison-Wesley Mobile Programming Series Visit /mobile for a complete list of available publications. The repository is still in it’s early stages and new features are planned to be implemented in the near future. Thank you for checking out this tutorial. ![]() Note: Make sure you set the deceleration rate to fast for the collection view or the animation would be slow:ĬcelerationRate = UIScrollViewDecelerationRateFast ![]() Set the targetContentOffset pointee to the new value, which will scroll the collection view to that offset.Get the adjacent item scroll offset by adding the item width to the cell spacing first, and then multiplying it by the new adjacent item index retrieved in step 5.Add the coefficient retrieved in step 3 to the current index.Get the current index by dividing the offset over the item width.Check if the scroll’s magnitude is greater than the scrollThreshold and create a coefficient that has one of 3 values (-1, 0, 1).Calculate the total distance for the scroll.Changing this value will change where the scroll view will stop, and it automatically animates it without any extra work. The pointer points to the value where the scroll view will stop. We get the destination where the scroll view‘s dragging will stop from the targetContentOffset pointer. ![]() Let’s break this down into several steps: ![]()
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