ios - 用户是否可以禁用本地通知？

Question

我创建了一个应用程序，每天早上 9 点向用户发送通知，但希望用户能够根据需要将其关闭。

我已经为应用程序设置了一个设置包，并为 enableNotifications 设置了一个 slider 。当我构建和测试应用程序时，设置就在那里，我可以打开或关闭它们……但它似乎没有在应用程序中注册。如何对应用程序进行编程以检查通知设置是打开还是关闭？

我看到了这个答案:Determine on iPhone if user has enabled push notifications 但我不知道把它放在哪里并正确编程(if/else 语句等)

这是创建通知的代码:

-(id) getCommandInstance:(NSString*)className
{
/** You can catch your own commands here, if you wanted to extend the gap: protocol, or add your
* own app specific protocol to it. -jm
**/
[[UIApplication sharedApplication] cancelAllLocalNotifications];
[UIApplication sharedApplication].applicationIconBadgeNumber = 0;
NSCalendar *calender = [NSCalendar autoupdatingCurrentCalendar];
NSDate *currentDate = [NSDate date];

NSDateComponents *dateComponents = [calender components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit)
fromDate:currentDate];

NSDateComponents *temp = [[NSDateComponents alloc]init];

[temp setYear:[dateComponents year]];
[temp setMonth:[dateComponents month]];
[temp setDay:[dateComponents day]];
[temp setHour: 22];
[temp setMinute:00];

NSDate *fireTime = [calender dateFromComponents:temp];
[temp release];

// set up the notifier
UILocalNotification *localNotification = [[UILocalNotification alloc]init];
localNotification.fireDate = fireTime;
localNotification.timeZone = [NSTimeZone defaultTimeZone];

localNotification.alertBody = @"Don't Forget Your 365 Day Photo Challenge!";
localNotification.alertAction = @"LAUNCH";

localNotification.soundName = UILocalNotificationDefaultSoundName;

localNotification.repeatInterval = NSDayCalendarUnit;
localNotification.applicationIconBadgeNumber = 0;
[[UIApplication sharedApplication]scheduleLocalNotification:localNotification];
[localNotification release];
return [super getCommandInstance:className];
}

Answer 1

如果您只有一个 localNotification 并且想取消它，您可以调用:

[[UIApplication sharedApplication] cancelAllLocalNotifications];

如果没有任何 localNotifications，这不会抛出错误。您可以通过按下按钮 IBAction 来调用它。如果你想根据是否有任何 localNotifications 来设置开关的状态，那么你可以检查它是否有:

NSArray* localNotifications = [[UIApplication sharedApplication] 
                                              scheduledLocalNotifications];

如果 localNotifications.count > 0，那么您已经安排了一些通知。