问要在设置中启用当前的键盘吗？

EN

NSArray *keyboards = [UITextInputMode activeInputModes];
for (UITextInputMode *mode in keyboards) {
    NSString *name = mode.primaryLanguage;
    if ([name hasPrefix:@"zh-Han"]) {
        // One of the Chinese keyboards is installed
        break;
    }
}

let keyboards = UITextInputMode.activeInputModes()
for var mode in keyboards  {
    var primary = mode.primaryLanguage
    if let lang = primary {
        if lang.hasPrefix("zh") {
            // One of the Chinese keyboards is installed
            break
        }
    }
}

NSArray *keyboards = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleKeyboards"];
for (NSString *keyboard in keyboards) {
    if ([keyboard hasPrefix:@"zh_Han"]) {
        // One of the Chinese keyboards is installed
    }
}

    //Put below function in app delegate...

    public func isKeyboardExtensionEnabled() -> Bool {
        guard let appBundleIdentifier = NSBundle.mainBundle().bundleIdentifier else {
            fatalError("isKeyboardExtensionEnabled(): Cannot retrieve bundle identifier.")
        }

        guard let keyboards = NSUserDefaults.standardUserDefaults().dictionaryRepresentation()["AppleKeyboards"] as? [String] else {
            // There is no key `AppleKeyboards` in NSUserDefaults. That happens sometimes.
            return false
        }

        let keyboardExtensionBundleIdentifierPrefix = appBundleIdentifier + "."
        for keyboard in keyboards {
            if keyboard.hasPrefix(keyboardExtensionBundleIdentifierPrefix) {
                return true
            }
        }

        return false
    }


    // Call it from below delegate method to identify...

    func applicationWillEnterForeground(_ application: UIApplication) {

            if(isKeyboardExtensionEnabled()){            
                showAlert(message: "Hurrey! My-Keyboard is activated");
            }
            else{
                showAlert(message: "Please activate My-Keyboard!");
            }

        }

    func applicationDidBecomeActive(_ application: UIApplication) {

            if(isKeyboardExtensionEnabled()){            
                showAlert(message: "Hurrey! My-Keyboard is activated");
            }
            else{
                showAlert(message: "Please activate My-Keyboard!");
            }
        }