change-app-icon.md

Change app icon

1. Update plist file

<key>CFBundleIcons</key>
	<dict>
		<key>CFBundleAlternateIcons</key>
		<dict>
			<key>Yalla</key>
			<dict>
				<key>CFBundleIconFiles</key>
				<array>
					<string>Yalla</string>
				</array>
			</dict>
			<key>Yo</key>
			<dict>
				<key>CFBundleIconFiles</key>
				<array>
					<string>Yo</string>
				</array>
			</dict>
		</dict>
		<key>CFBundlePrimaryIcon</key>
		<dict>
			<key>CFBundleIconFiles</key>
			<array>
				<string></string>
			</array>
			<key>UIPrerenderedIcon</key>
			<false/>
		</dict>
	</dict>

2. Set alternate icon

guard let name = name else {
            // Reset to default
            UIApplication.shared.setAlternateIconName(nil)
            return
        }
        
        UIApplication.shared.setAlternateIconName(name){ error in
            if let error = error {
                print(error.localizedDescription)
            }
        }

3. You cannot change the app icon in background. An alert message shows when the icon is changed.

Reference

supportsAlternateIcons

Change your app’s icon programmatically in iOS 10.3