问题
Getting reports that, after updating our app, the springboard icon does not update, requiring the device to be turned off and on for the change to take effect.
This has happened when updating from a live version to a test build (via iTunes) and updating from an old (live) version to the latest live version (via appstore on device).
This isn't a regular occurrence, but I am wondering what might be causing this?
回答1:
Use "Build > Clean all Targets" and then build and run. Xcode doesn't always see that images have been updated, and leaves them out of incremental builds. Cleaning before building makes Xcode build the app file from scratch, and will pick up any images it's failing to get.
回答2:
I was facing this issue and none of the provided answers here or somewhere else helped me so I did next steps.
For X-Code 8+
I've opened my project viewer
Then I've chosen Assets
Right-clicked there and I've chosen App Icons & Launch Images -> New iOS App icon
Attach the images, that you want to resolutions of your app icon in your newly created AppIcon asset (rename it as you want)
Then go to the project settings and choose new app icon there
It worked for me
来源：https://stackoverflow.com/questions/9809700/app-icon-not-changing-after-updating-app