Changing alternate icon for iPad

Question

I have a problem with changing app\'s icon on iPad. Everything is working fine on iPhone but on iPad I get this error :

[default] Failed to set preferred

Answer 1

Attempting to give a more re-useable (easy to copy/paste) version of this answer.

1) You need images of the following names and sizes added as regular .png files (no asset catalogues)

.../AppIcon-Dark/iPad-app.png
  pixelWidth: 76
.../AppIcon-Dark/iPad-app@2x.png
  pixelWidth: 152
.../AppIcon-Dark/iPad-pro@2x.png
  pixelWidth: 167
.../AppIcon-Dark/iPhone-app@2x.png
  pixelWidth: 120
.../AppIcon-Dark/iPhone-app@3x.png
  pixelWidth: 180

you can then add/insert the following in your info.plist

CFBundleIcons

    CFBundleAlternateIcons
    
        AppIcon-Dark
        
            CFBundleIconFiles
            
                iPhone-app
            
        
    
    CFBundlePrimaryIcon
    
        CFBundleIconFiles
        
            AppIcon
        
    

CFBundleIcons~ipad

    CFBundleAlternateIcons
    
        AppIcon-Dark
        
            CFBundleIconFiles
            
                iPad-app
                iPad-pro
            
        
    
    CFBundlePrimaryIcon
    
        CFBundleIconFiles
        
            AppIcon
        
    

I then set my icon with the following

func updateIcon() {
    if #available(iOS 13.0, *) {
        let dark = window?.traitCollection.userInterfaceStyle == .dark

        let currentIconName = UIApplication.shared.alternateIconName
        let desiredIconName:String? = dark ? "AppIcon-Dark" : nil

        if currentIconName != desiredIconName {
            UIApplication.shared.setAlternateIconName(desiredIconName) {
                (error) in
                print("failed: \(String(describing: error))")
            }
        }
    }
}