iOS在特定日期设置本地通知 [英] iOS set local notification on a specific day

问题描述

我确信这个问题在某处重复，但我找不到解决方案。我正在创建一个应用程序，其中一个功能允许用户选择他们将收到本地通知的日期和时间。

I am sure this question is duplicated somewhere, but I can't find a solution. I am making an app in which one feature allows the user to select the days and times they will receive a local notification.

他们可以选择他们喜欢的一天中的任何时间，并可以切换一周的不同日子（周一，周二，婚礼等）。通知将每周发送一次。因此，我限制用户只创建3个通知 - 如果选择了所有7天，我会将 repeatInterval 设置为每日（一个通知）。如果为每3个通知选择了6天，那么我将需要每天的单独通知（总共3x6 = 18个通知）。很可能只会使用1个通知，所以这很好。

They can select any time of the day they like, and can toggle the different days of the week (mon, tues, weds etc). The notifications will be sent weekly. I therefore limit the user to creating just 3 notifications - if all 7 days are selected I will set the repeatInterval to daily (one notification). If 6 days are selected for each 3 notifications then I will need an individual notification for each day (totalling 3x6=18 notifications). In all likelihood, only 1 notification will be used so this is fine.

我知道如何在将来的某个时间设置通知，但我该如何设置星期一下午6点的通知？

I know how to set an notification for a certain time in the future, but how do I set a notification for say 6pm on a Monday?

以下是我用于测试的代码。它在未来设置了4秒的警报（我从 applicationDidEnterBackground 调用它）。

Below is my code which I have been using for testing. It sets an alert for 4 seconds in the future (I was calling it from applicationDidEnterBackground).

    NSDateComponents *changeComponent = [[NSDateComponents alloc] init];
    changeComponent.second = 4;

    NSCalendar *theCalendar = [NSCalendar currentCalendar];
    NSDate *itemDate = [theCalendar dateByAddingComponents:changeComponent toDate:[NSDate date] options:0];

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
    localNotif.fireDate = itemDate;
    localNotif.timeZone = [NSTimeZone defaultTimeZone];
    localNotif.repeatInterval = NSWeekdayCalendarUnit;

推荐答案

与你现在的做法完全一样，但是以不同方式创建日期：

Exactly the same way you are doing right now, but create a date differently:

NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease];
[comps setDay:1];
[comps setMonth:1];
[comps setYear:2013];
[comps setHour:10];
[comps setMinute:10];
[comps setSecond:10];
localNotif.fireDate = [[NSCalendar currentCalendar] dateFromComponents:comps];

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