以下是检测是否已呈现的方法。

Here is how I detect if it has been presented.

private static func checkIfShownSKStoreReviewController(_ iteration: Int, originalWindowCount: Int) {
    let windows = UIApplication.shared.windows
    if windows.count > originalWindowCount {
        let window = windows[1]

        if window.className == "UITextEffectsWindow" || window.className == "UIRemoteKeyboardWindow" {
            print("Shown SKVC iteration: \(iteration)")

            //Do logic stuff like saving to your database
            return
        }
    }

    if iteration > 2000 {
        print("checkIfShownSKStoreReviewController: timeout, bailing \(iteration)")
        return
    }

    runThisAfterDelay(seconds: 0.02, after: {
        checkIfShownSKStoreReviewController(iteration + 1, originalWindowCount: originalWindowCount)
    })
}

private static func runThisAfterDelay(seconds seconds: Double, after: () -> ()) {
    let time = dispatch_time(DISPATCH_TIME_NOW, Int64(seconds * Double(NSEC_PER_SEC)))
    dispatch_after(time, dispatch_get_main_queue(), after)
}

static func showReview() {
    print("Showing AppStore Review")
    if #available(iOS 10.3, *) {
        SKStoreReviewController.requestReview()
        checkIfShownSKStoreReviewController(0, originalWindowCount: UIApplication.shared.windows.count)
    }
}