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Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
5 (1)
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Learning Swift Second Edition

Learning Swift Second Edition

5 (1)
By: Andrew J Wagner

Overview of this book

Swift is Apple’s new programming language and the future of iOS and OS X app development. It is a high-performance language that feels like a modern scripting language. On the surface, Swift is easy to jump into, but it has complex underpinnings that are critical to becoming proficient at turning an idea into reality. This book is an approachable, step-by-step introduction into programming with Swift for everyone. It begins by giving you an overview of the key features through practical examples and progresses to more advanced topics that help differentiate the proficient developers from the mediocre ones. It covers important concepts such as Variables, Optionals, Closures, Generics, and Memory Management. Mixed in with those concepts, it also helps you learn the art of programming such as maintainability, useful design patterns, and resources to further your knowledge. This all culminates in writing a basic iOS app that will get you well on your way to turning your own app ideas into reality.
Table of Contents (14 chapters)
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13
Index

Populating our photo grid

Now that we are maintaining a list of photos, we need to display it in our collection view. A collection view is populated by providing it with a data source that implements its UICollectionViewDataSource protocol. Probably the most common thing to do is to have the view controller be the data source. We can do this by opening the Main.storyboard back up and control dragging from the collection view to the view controller:

Populating our photo grid

When you let go, select dataSource from the menu. After that, all we need to do is implement the data source protocol. The two methods we need to implement are collectionView:numberOfItemsInSection: and collectionView:cellForItemAtIndexPath:. The former allows us to specify how many cells should be displayed and the latter allows us to customize each cell for a specific index into our list. It is easy for us to return the number of cells that we want:

extension ViewController: UICollectionViewDataSource {
    func collectionView(
        collectionView...

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