This process might also be familiar from table views. Use the Attributes inspector to set the Reuse Identifier to FlickrCell. Select the single cell in the collection view. In this tutorial, you’ll stick with the more common Vertical collection view. Users scroll horizontally to see items that don’t fit on the screen. If there are too many elements to fit in the view, the user can scroll vertically to see more.Ĭonversely, a horizontal flow layout places items from top to bottom across the left edge of the view until it reaches the bottom edge. At which point, it moves down to the next line. Note: Wondering what Scroll Direction does? This property is specific to UICollectionViewFlowLayout and defaults to Vertical.Ī vertical flow layout means the layout class places items from left to right across the top of the view until it reaches the view’s right edge. Then change the background color to White Color: First, select the UICollectionView inside.
Next, select the Navigation Controller you installed and make it the initial view controller in the Attributes inspector:įocus on the collection view controller. You now have a layout like this in the storyboard: Go to Editor ▸ Embed in ▸ Navigation Controller to create a navigation controller and automatically set the collection view controller as the root. Open Main.storyboard and drag in a Collection View Controller. Have a look around before you go any further. Inside, you’ll find an empty Main.storyboard and some files for interfacing with Flickr.
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It lets you search for a term on the popular photo-sharing site Flickr then download and display any matching photos in a grid view, as you saw in the screenshot above.ĭownload the project files by clicking the Download Materials button at the top or bottom of the tutorial. In this tutorial, you’ll create a cool photo-browsing app called FlickrSearch. Now, it’s time to get your hands into the mix with a project! Introducing FlickrSearch You’ll learn more about these elements in-depth throughout this tutorial. You can use this layout class out of the box or subclass it to get some interesting behavior and visual effects. Elements lay out one after another based on their size, like a grid view. You can subclass UICollectionViewLayout to create your own custom layouts, but Apple has graciously provided a basic flow-based layout called UICollectionViewFlowLayout. The collection view can even automatically animate switching from one layout to another! Layout objects are subclasses of UICollectionViewLayout. In addition to the visual components described above, a collection view has a layout object responsible for the content’s size, position and other attributes. You won’t use decoration views in this tutorial since they require you to write a custom layout class. Background images or other visual embellishments are good examples of decoration views. Use decoration views to add extra views that don’t contain useful data but enhance the collection view’s appearance. Note: Collection views can also have Decoration Views. Developers commonly used them for headers or footers.
You’re not limited to stacks and grids because collection views are customizable. UICollectionView makes adding custom layouts and layout transitions, like those in Photos, simple to build. You’re probably thinking, “Wow, I want my app to do that!” You can even transition between the two layouts with a cool pinch gesture. The iOS Photos app has a stylish way of displaying photos via a multitude of layouts.
Flowlayout start new line update#
Update note: Owen Brown updated this tutorial for iOS 14, Xcode 12 and Swift 5.
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