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Adding Image Assets

hlpostman edited this page Oct 6, 2018 · 23 revisions

Asset Catalogs makes asset management easy. To add assets to a project, follow the steps below. Note that in Xcode 10, the Media Library has moved from the lower right-hand corner - to access the assets from a storyboard with Xcode 10, hit command + shift + m.

adding image assets

Step 1: Select the asset catalog

As in the screenshot above, click Assets.xcassets in the project navigator to bring up the Asset Catalog for the project.

Step 2: Add Image Set

To add an image to the project, create a new image set. Drag the png asset (jpeg won't work) from the Finder to the 1X or 2X slot. In a production app, you should include both the standard (1X) as well as retina (2X) asset. During development, you can add only one asset and XCode will automatically create the other one, although it may look blurry.

Step 3: Using the image set

Example 1: Using the image set in Interface Builder

Any control that has images like UIImageViews or UIButtons can set images in Interface Builder. Any image set in the Asset Catalog will be listed in the image drop down menus.

Example 1: Using the image set programmatically

To access images in the Asset Catalog programmatically, create UIImages using the imageNamed: method as shown in the snippet below.

var chat = UIImage(named: "Chat")
var chatImageView = UIImageView(image: chat)
UIImage *chat = [UIImage imageNamed:@"Chat"];
UIImageView *chatImageView = [[UIImageView alloc] initWithImage:chat];

Swift 3

Swift 3 introduces Image Literals. NOTE: The technique above, initializing a UIImage using its name, still works too.

App Icon

To set the app icon, simply select "App Icon" in the asset catalog and drag a .png file into the appropriate bucket. The App Icon expects various sizes for production, although you can use just one during development. Similarly, in production, the Launch Image expects 3.5" and 4" images, but you can use just one during development.

App icon gif

Launch Screen

For the launch image, you will need to configure the LaunchScreen.storyboard file as you would any other ViewController.

  • Add your Launch Screen Asset to the Assets.xcassets folder.
  • Drag the Launch Screen image from the media library (Bottom right in utilities pane for Xcode versions less than 10, or pop up window with command + shift + m for Xcode 10), on to the LaunchScreen ViewController.
  • HINT: If Xcode is having trouble recognizing your Launch Screen image file, try renaming it in the finder before dragging it into your assets folder (see the first example below)

Example for Xcode versions less than 10

Add assets, icon, and Launch

Example for Xcode version 10

Media Library pop up opened by hitting the keys "command", "shift", and "m" at the same time Add image asset to launch screen Xcode 10

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