iOS：日期忽略當年的組件

Question

我編寫了一個應用程序，讓用戶在日期選擇器中輸入日期，他們將按下按鈕在日期到來前3天安排本地通知。唯一的問題是，我如何編輯此代碼，以不考慮用戶輸入的年份？因爲他們可能會輸入類似1980年的東西，這顯然已經過去了。

我試過刪除[dateComps setYear:[dateComponents year]];，但這會導致通知立即觸發。我也嘗試從日期組件中刪除這兩個和NSYearCalendarUnit，但同樣的事情發生。任何幫助深表感謝！這裏是我的代碼：

- (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

按照要求：

什麼如果你忽略輸入的年份並用當前年份替代它？

Answer 2

你可以得到當年，並將其設置爲你的dateComps

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

編輯：

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];