Update:
Swift 5.1, Xcode 11
Tested on Real Device iOS 13.0 (Guarantee to work)
import StoreKit
func rateApp() {
if #available(iOS 10.3, *) {
SKStoreReviewController.requestReview()
} else {
let appID = "Your App ID on App Store"
let urlStr = "https://itunes.apple.com/app/id\(appID)" // (Option 1) Open App Page
let urlStr = "https://itunes.apple.com/app/id\(appID)?action=write-review" // (Option 2) Open App Review Page
guard let url = URL(string: urlStr), UIApplication.shared.canOpenURL(url) else { return }
if #available(iOS 10.0, *) {
UIApplication.shared.open(url, options: [:], completionHandler: nil)
} else {
UIApplication.shared.openURL(url) // openURL(_:) is deprecated from iOS 10.
}
}
}