iOS UICollectionView: The Complete Guide, Second Edition (Fahad Batla's Library) by Ash Furrow
Author:Ash Furrow
Language: eng
Format: epub, mobi
Publisher: Addison-Wesley Professional
Published: 2014-10-26T16:00:00+00:00
return self;
}
* * *
Amazing! Figure 4.5 shows we’re nearly there. The final thing I think this demo app could use is some nice animations. Support for animations is already built into UICollection-ViewLayout; we just need to implement a few methods.
Figure 4.5 Decoration views implemented
initialLayoutAttributesForAppearingItemAtIndexPath: is called whenever a new item is added or updated to the collection view. We can use it to supply initial layout attributes for the item at the beginning of the animation and the collection view will interpolate animatable properties, like frame and alpha, to their normal position. There is also a corresponding method called finalLayoutAttributesForDisappearingItemAtIndexPath: for animating removal of items from the collection view.
We can animate more than just items, though. There are corresponding appear/disappear methods for supplementary views and decoration views. The default implementation of UICollectionViewLayout returns nil, indicating a simple crossfade. We can also return nil to use a crossfade.
The remaining problem is that we reload other sections when we insert a new one. This will cause more than just the appearing sections to animate. Let’s limit which sections we animate.
Before any updates are performed to the collection view, prepareForCollectionView-Updates: is called with an array of UICollectionViewUpdateItem objects as a parameter. These are the updates that are about to happen. After they are completed, finalize-CollectionViewUpdates is called. These come in pairs. We’ll create an instance variable NSMutableSet to hold on to the sections that are being inserted. We use a set because it has constant-time lookup (see Listing 4.10).
Listing 4.10 Updated init Method to Create Mutable Set
Download
iOS UICollectionView: The Complete Guide, Second Edition (Fahad Batla's Library) by Ash Furrow.mobi
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.
What's Done in Darkness by Kayla Perrin(26600)
The Fifty Shades Trilogy & Grey by E L James(19084)
Shot Through the Heart: DI Grace Fisher 2 by Isabelle Grey(19067)
Shot Through the Heart by Mercy Celeste(18940)
Wolf & Parchment: New Theory Spice & Wolf, Vol. 10 by Isuna Hasekura and Jyuu Ayakura(17123)
Python GUI Applications using PyQt5 : The hands-on guide to build apps with Python by Verdugo Leire(17001)
Peren F. Statistics for Business and Economics...Essential Formulas 3ed 2025 by Unknown(16883)
Wolf & Parchment: New Theory Spice & Wolf, Vol. 03 by Isuna Hasekura and Jyuu Ayakura & Jyuu Ayakura(16831)
Wolf & Parchment: New Theory Spice & Wolf, Vol. 01 by Isuna Hasekura and Jyuu Ayakura & Jyuu Ayakura(16455)
The Subtle Art of Not Giving a F*ck by Mark Manson(14357)
The 3rd Cycle of the Betrayed Series Collection: Extremely Controversial Historical Thrillers (Betrayed Series Boxed set) by McCray Carolyn(14145)
Stepbrother Stories 2 - 21 Taboo Story Collection (Brother Sister Stepbrother Stepsister Taboo Pseudo Incest Family Virgin Creampie Pregnant Forced Pregnancy Breeding) by Roxi Harding(13653)
Scorched Earth by Nick Kyme(12775)
Drei Generationen auf dem Jakobsweg by Stein Pia(10968)
Suna by Ziefle Pia(10892)
Scythe by Neal Shusterman(10342)
The Ultimate Python Exercise Book: 700 Practical Exercises for Beginners with Quiz Questions by Copy(9683)
D:\Jan\FTP\HOL\Work\Alien Breed - Tower Assault CD32 Alien Breed II - The Horror Continues Manual 1.jpg by PDFCreator(9674)
De Souza H. Master the Age of Artificial Intelligences. The Basic Guide...2024 by Unknown(9616)
