iOS：忽略年份的日期组件

Question

我编写了一个应用程序，让用户在日期选择器上输入日期，然后他们将按下按钮在日期临近前 3 天安排本地通知。唯一的问题是，我如何编辑此代码以不考虑用户输入的年份？因为他们可能会输入类似 1980 的年份，而这显然已经过去了。

我尝试删除 [dateComps setYear:[dateComponentsyear]];，但这会导致通知立即触发。我还尝试从日期组件中删除该组件和 NSYearCalendarUnit，但发生了同样的事情。非常感谢任何帮助！这是我的代码：

- (IBAction)scheduleNotifButton:(id)sender {
    NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];

    NSDate *pickerDate = [self.datePicker date];

    NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit )
                                                   fromDate:pickerDate];
    NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit )
                                                   fromDate:pickerDate];

    NSDateComponents *dateComps = [[NSDateComponents alloc] init];
    [dateComps setDay:[dateComponents day]];
    [dateComps setMonth:[dateComponents month]];
    [dateComps setYear:[dateComponents year]];
    [dateComps setHour:13];
    [dateComps setMinute:30];
    [dateComps setSecond:[timeComponents second]];
    NSDate *itemDate = [calendar dateFromComponents:dateComps];

    UILocalNotification *localNotif = [[UILocalNotification alloc] init];
    if (localNotif == nil)
        return;
    localNotif.fireDate = itemDate;
    localNotif.timeZone = [NSTimeZone defaultTimeZone];

    localNotif.alertBody = @"Event is in 3 days!";
    localNotif.alertAction = nil;

    localNotif.soundName = UILocalNotificationDefaultSoundName;
    localNotif.applicationIconBadgeNumber = 0;

    [[UIApplication sharedApplication] scheduleLocalNotification:localNotif];

}

Answer 1

根据要求：

如果您忽略输入的年份并将其替换为当前年份会怎样？

Answer 2

您可以获取当前年份，并将其设置为您的 dateComps

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit fromDate:[NSDate date]];
[dateComps setYear:[components year]];

编辑：

NSDateComponents *dateComps = [[NSDateComponents alloc] init];
[dateComps setDay:[dateComponents day]];
[dateComps setMonth:[dateComponents month]];

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit fromDate:[NSDate date]];
[dateComps setYear:[components year]];

[dateComps setHour:13];
[dateComps setMinute:30];
[dateComps setSecond:[timeComponents second]];
NSDate *itemDate = [calendar dateFromComponents:dateComps];