iPhone : Daily local notifications

问题

I am trying to implement local notification

This is what I have set

    // Current date
    NSDate *date = [NSDate date]; 

    // Add one minute to the current time
    NSDate *dateToFire = [date dateByAddingTimeInterval:20];

    // Set the fire date/time
    [localNotification setFireDate:dateToFire];
    [localNotification setTimeZone:[NSTimeZone defaultTimeZone]];

Instead of 20, I want to put a fixed time(daily)to start push.

For ex:I want to push notification pop up at every 6:00AM.

How can do that ?

Thanks

回答1:

You just need to properly create a NSDate object to be your fire date (time). Instead of using [NSDate dateByAddingTimeInterval: 20], use something like this:

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [[NSDateComponents alloc] init];
[components setDay: 3];
[components setMonth: 7];
[components setYear: 2012];
[components setHour: 6];
[components setMinute: 0];
[components setSecond: 0];
[calendar setTimeZone: [NSTimeZone defaultTimeZone]];
NSDate *dateToFire = [calendar dateFromComponents:components];

Here are the Apple NSDateComponents API docs

And then when you add the date to the notification, set the repeat interval to one day:

[localNotification setFireDate: dateToFire];
[localNotification setTimeZone: [NSTimeZone defaultTimeZone]];
[localNotification setRepeatInterval: kCFCalendarUnitDay];

As with all date related code, make sure to test how this works during the switch to daylight savings time, if your time zone uses daylight savings time.

回答2:

I guess what you need is NSDayCalendarUnit.

You can check this answer. And here is another tutorial worth reading.

回答3:

 NSDate *alertTime = [[NSDate date] dateByAddingTimeInterval:10];
    UIApplication* app = [UIApplication sharedApplication];

    UILocalNotification* notifyAlarm = [[[UILocalNotification alloc] init] autorelease];
    if (notifyAlarm)
    {
        notifyAlarm.fireDate = alertTime;
        notifyAlarm.timeZone = [NSTimeZone defaultTimeZone];
        notifyAlarm.repeatInterval = 0;
        notifyAlarm.soundName = @"Glass.aiff";
        notifyAlarm.alertBody = @"Staff meeting in 30 minutes";

        [app scheduleLocalNotification:notifyAlarm];
    }

来源：https://stackoverflow.com/questions/11303413/iphone-daily-local-notifications