iOS 判断推送开关是否打开
方案如下：
根据 [[UIApplication sharedApplication] enabledRemoteNotificationTypes] 的返回值来进行判断，该返回值是一个枚举值，如下：
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typedef enum {
UIRemoteNotificationTypeNone = 0,
UIRemoteNotificationTypeBadge = 1 << 0,
UIRemoteNotificationTypeSound = 1 << 1,
UIRemoteNotificationTypeAlert = 1 << 2,
UIRemoteNotificationTypeNewsstandContentAvailability = 1 << 3,
} UIRemoteNotificationType;
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如果是 UIRemoteNotificationTypeNone ，则可以认为推送开关没有打开，反之亦然。
