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I've just found out that in order to be able to have the description for your app in the app store say "This app is optimized for iPhone 6, and iPhone 6 Plus." you need to use a launch XIB or storyboard file for your launch images (per [Apple][1]).
So, I've created a new Launch Screen xib and now I'm a little but since I usually do everything in code and don't use interface builder. I've deleted the default label that is inserted and dropped a UIImageView into the view. Now I'm wondering how would I:
1) Tell the UIImageView to resize to the size of whatever screen it's on
2) Tell the UIImageView to pick ImageA if a 3.5 inch screen is running the app or the ImageB if a 4 inch screen is running the app etc. etc.
Essentially, I'm just trying to get the launch .xib to mimic the behavior of how the launch screen works normally. Would appreciate it if anyone could provide some assistance on this!
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storyboard to configure your launch screen. If your project doesn't contain a default launch screen file, add a launch screen file and set the launch screen file for the target in the project editor. Choose File > New > File. Under User Interface, select Launch Screen, and click Next.
In SwiftUI projects, the launch screen is not generated by default. You need to add it manually in the Info. plist file. After opening the file, you should see an entry named Launch Screen.
Adding a Launch Screen in Swift Projects A launch screen is the very first screen presented to users when your app starts up. When you create a new project with UIKit, Xcode automatically generates a storyboard file named LaunchScreen.storyboard for developers to design the launch screen of the app.
Open LaunchScreen.storyboard for editing by double-clicking it in the Solution Pad. Choose a device and orientation on which to preview the Launch Screen Storyboard in the iOS Designer. Open the device selection panel on the bottom toolbar and select iPhone 4S and Portrait.
In SwiftUI projects, the launch screen is not generated by default. You need to add it manually in the Info.plist file. After opening the file, you should see an entry named Launch Screen. Click the arrow on its left to change the direction. Then click the + button to add a new entry.
A Storyboard used as a Launch Screen must include only simple, built-in UI elements and cannot do any calculations or derive from a custom class. For more information about creating a Launch Screen with a Unified Storyboard, please see the Dynamic Launch Screens section of the Unified Storyboards guide.
You have two options:
You make use of autolayout and give the imageview a fullscreen appearance (distance to top, bottom, left and right equals 0). This would however result in a clipping of the image for certain screen sizes, what you may not want. So you might want to consider (2)
You place the launch screen image into an asset catalog and just put different images into the different size classes.
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I found the answer useful.
The old steps in short for creating the LaunchScreen xib for iOS 8 are below the new steps.
With reference to XCode 9, Swift 3 or Swift 4 and LaunchScreen.storyboard following are the new steps.
First step is to create two images for Portrait and landscape mode splash ( png or jpeg ) in your favorite graphic software. ( If your app only support Portrait mode, you may skip Landscape mode image and settings. )
Portrait mode image :-
Create a 'splash-portrait' image with your own full background for size of "width 1125 x height 2436". Note that the background will clip on various sizes of devices.
Whichever info, graphic, you do not wish to be clipped should be created on center of above image in the size of "width 1125 x height 1471". This should always be in center of above full image.
Landscape mode image :-
Create a 'splash-landscape' image with your own full background for size of "width 2436 x height 1125". Note that the background will clip on various sizes of devices.
Whichever info, graphic, you do not wish to be clipped should be created on center of above image in the size of "width 860 x height 1125". This should always be in center of above full image.
Once both the images are ready, you may add it to xcassets or keep in resource.
Now go for the following steps.
1) "LaunchScreen storyboard" is already created with the new project. Open it.
2) Add an Image View on the view.
3) Set the above saved 'splash-portrait' image to image view source.
4) Set Image view 'Content mode' of Image as "Aspect Fill".
5) Add 4 constraints of Image View for Top, Bottom, Trailing and Leading to Superview.
This is done for the portrait mode app splash.
For landscape mode support, do the following extra steps. ( you may refer full answer by @Sakiboy at https://stackoverflow.com/a/46089856/2641380 )
6) Click the + button next to the Image view source that you set up in step 3.
7) From the pop-up that is now displayed select Regular for both the Width and Height selectors. This is specifying a new adaptive set for iPads that are in landscape. A new image source field will appear with the title wR hR. Add the 'splash-landscape' image to the wR hR Image source field so the storyboard knows to use a different image when in landscape.
8) Now we need to add support for the 'iphone plus' devices when in landscape. So click the + button next to the Image source field again.
9) This time select compact for the height and regular for the width selectors. This is specifying a new adaptive set for “iPhone plus” devices that are in landscape. A new image source field will appear with the title wR hC.
10) Add the “splash-landscape” image to the wR hC Image source field so the storyboard knows to use a different image when in landscape on an “iPhone plus device”.
As iPad devices are "Regular for both the Width and Height", We will see 'splash-landscape' image in iPad for both portrait and landscape mode. Width 860 for displayable content in 'splash-landscape' image will show full content in both portrait and landscape mode.
The old steps in short for creating the LaunchScreen xib for iOS 8.
1) create a new "LaunchScreen xib" from new file --> user interface --> launch screen ( keep auto layout ON ).
2) Add an image view in the xib --> view (main view).
3) set splash image to it ( the image should not be in assets file ).
4) set image as "Aspect Fit" ( if required ).
5) you may also change the "view" (super view) background color as close to background color of image.
6) select the image view, click from menu - editor - pin - bottom space to super view.
7) this will show red error mark near "view" ( super view of image view ).
8) click on the error mark, you will see approximate two auto layout errors.
9) on clicking on the error you will find menu with auto fix the layout errors.
10) on fixing the errors, you will find total four "Constraints" with "vertical" and "horizontal" space between superview and image.
11) now you may test them in different devices or simulators.
Regards.
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You can resize the image by setting constraint to the top, bottom, leading and trailing edges of the superview. Just click the imageview and select Editor->Pin the top context menu. You can also set the aspects of the UIImageView by clicking it and setting it to for instance "Aspect Fit". Make sure the ImageView covers the whole screen before setting the constraints, or else you would have to modify the contstraints.
To set different images for different screen sizes, I would guess you have to create a class and modify to the viewWillAppear method to load an appropriate image
Good luck! Erik
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