[[UIApplication sharedApplication] enabledRemoteNotificationTypes]

UIUserNotificationType

該型別是個列舉，可以判斷各個推送是否開啟：

typedef enum {
    UIRemoteNotificationTypeNone    = 0,
    UIRemoteNotificationTypeBadge   = 1 << 0,
    UIRemoteNotificationTypeSound   = 1 << 1,
    UIRemoteNotificationTypeAlert   = 1 << 2,
    UIRemoteNotificationTypeNewsstandContentAvailability = 1 << 3,
} UIRemoteNotificationType;
 

UIUserNotificationType types = [[UIApplication sharedApplication] currentUserNotificationSettings].types;