ios - 当最小目标平台是 iOS 7.0 时，如何在 Swift 中使用 iOS 8.0 API？

Question

今天，我在学习Notification。在 registerUserNotificationSettings(_:) 定义下，在 UIApplication 类引用中，它说

"Prior to scheduling any local notifications, you must call the registerUserNotificationSettings method to let the system know what types of alerts, if any, you plan to display to the user."

但 registerUserNotificationSettings 仅适用于 iOS 8.0 或更高版本。那么，如果我使用 Swift，如何使其与 iOS 7 兼容？

Answer 1

您可以在 Swift 2 中使用可用性检查并在 iOS 7 中使用 registerForRemoteNotifications

示例:

if #available(iOS 8.0, *) {
        let options: UIUserNotificationType =   [
            UIUserNotificationType.Alert,
            UIUserNotificationType.Badge,
            UIUserNotificationType.Sound
        ]

        let settings = UIUserNotificationSettings(forTypes: options, categories: nil)
        UIApplication.sharedApplication().registerUserNotificationSettings(settings)
    } else {
        let options: UIRemoteNotificationType = [UIRemoteNotificationType.Badge, UIRemoteNotificationType.Sound, UIRemoteNotificationType.Alert]
        UIApplication.sharedApplication().registerForRemoteNotificationTypes(options)
    }