UIDatePicker「copyWithZone」錯誤

Question

這是用於安排警報的以下代碼，並且我收到以下錯誤。它已經完美的工作，直到我試圖爲當前日期比較撿拾工具：

[self.eventText resignFirstResponder]; 

NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar]; 

//Get the current date 
NSDate *pickerDate = [self.datePicker date]; 

//Unable to set notification for same day 
[datePicker setMinimumDate:[NSDate date]]; 

//Break the date up into components 
NSDateComponents *dateComponents = [calendar components: (NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:pickerDate]; 
NSDateComponents *timeComponents = [calendar components: (NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit) fromDate:pickerDate]; 

// Schedule the notification 
UILocalNotification* localNotification = [[UILocalNotification alloc] init]; 
localNotification.fireDate = datePicker; 
localNotification.alertBody = self.eventText.text; 
localNotification.alertAction = @"Show me the item"; 
localNotification.timeZone = [NSTimeZone systemTimeZone]; 
localNotification.applicationIconBadgeNumber = [[UIApplication sharedApplication] applicationIconBadgeNumber] + 1; 

NSDictionary *infoDict = [NSDictionary dictionaryWithObjectsAndKeys:@"Object 1", @"Key 1", @"Object 2", @"Key 2", nil]; 
localNotification.userInfo = infoDict; 

[[UIApplication sharedApplication] scheduleLocalNotification:localNotification]; 

// Request to reload table view data 
[[NSNotificationCenter defaultCenter] postNotificationName:@"reloadData" object:self]; 

eventText.text = nil; 

[self dismissViewControllerAnimated:YES completion:nil]; 

接收以下錯誤：終止應用程序由於未捕獲的異常NSInvalidArgumentException，原因：-[UIDatePicker copyWithZone:]: unrecognized selector sent to instance 0x10ba853f0。我在調試中很糟糕，還沒有找到解決方案。

Answer 1

您有在這一行就是問題所在，我相信

localNotification.fireDate = datePicker; 

您沒有提供上述代碼中定義「日期選擇器」，但我的猜測是，你想鍵入「pickerDate」和而不是「datePicker」，它不符合NSCopying協議（並且不是NSDate），這就是錯誤引發的原因。