Question

我正在努力将本地通知添加到我正在开发的应用中。我在2013年4月30日纽约/东部时间晚上11点设置了一个通知。我该怎么做？我尝试了多种方法，但没有一种方法可以正常工作。这就是我现在正在使用的（它不起作用）：

- (void)applicationDidEnterBackground:(UIApplication *)application
{
if (![@"1" isEqualToString:[[NSUserDefaults standardUserDefaults]
                            objectForKey:@"setNotify"]]) {
    [[NSUserDefaults standardUserDefaults] setValue:@"1" forKey:@"setNotify"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    NSString *str = [NSString stringWithFormat:@"2013-04-23T18:22:00"];
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"YYYY-MM-dd'T'HH:mm:ss'"];
    [dateFormat setTimeZone:[NSTimeZone timeZoneWithName:@"US/Eastern"]];
    NSDate *dte = [dateFormat dateFromString:str];
    NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    [cal setTimeZone:[NSTimeZone timeZoneWithName:@"US/Eastern"]];
    UIApplication* app = [UIApplication sharedApplication];
    UILocalNotification* notifyAlarm = [[UILocalNotification alloc]
                                        init];
    if (notifyAlarm)
    {
        notifyAlarm.fireDate = dte;
        notifyAlarm.timeZone = [NSTimeZone timeZoneWithName:@"US/Eastern"];
        notifyAlarm.repeatInterval = 0;
        notifyAlarm.soundName = @"trumpet.m4a";
        notifyAlarm.alertBody = @"Message";
        [app scheduleLocalNotification:notifyAlarm];
    }
}
}

Answer 1

请尝试以下代码：

NSDateComponents *dateComps = [[NSDateComponents alloc] init];
[dateComps setDay:30];
[dateComps setMonth:4];
[dateComps setYear:2013];
[dateComps setHour:23];
[dateComps setMinute:0];
[dateComps setSecond:0];

NSDate *itemDate = [calendar dateFromComponents:dateComps];

UILocalNotification *localNotif = [[UILocalNotification alloc] init];
if (localNotif == nil)
    return;
localNotif.fireDate = itemDate;
localNotif.timeZone = [NSTimeZone timeZoneWithName:@"US/Eastern"];

localNotif.alertBody = @"Message";
localNotif.repeatInterval = 0;
localNotif.soundName = @"trumpet.m4a";
localNotif.applicationIconBadgeNumber = 1;

[[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

Answer 2

我注意到的一件事是我怀疑你打算在日期格式化程序中使用YYYY。来自Apple Docs

A common mistake is to use YYYY. yyyy specifies the calendar year whereas
YYYY specifies the year (of “Week of Year”), used in the ISO year-week calendar.
In most cases, yyyy and YYYY yield the same number, however they may
be different. Typically you should use the calendar year.

当我更改此代码时，您的代码为我工作并发布了通知。

为东部时区的未来日期设置本地通知

2 个答案: