ios 通知权限判断

在 iOS 中，可以使用以下代码来判断通知权限：

let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.getNotificationSettings { (settings) in
    switch settings.authorizationStatus {
        case .notDetermined:
            // Request authorization
            break
        case .denied:
            // The user has denied the notification permission
            break
        case .authorized:
            // The user has granted the notification permission
            break
        case .provisional:
            // The user has granted the notification permission, but it may be used only under certain conditions
            break
如果权限未确定，可以请求授权：
notificationCenter.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in
    if granted {
        // The user has granted the notification permission
    } else {
        // The user has denied the notification permission