UIDatePicker "copyWithZone“错误

Question

这是用于调度警报的以下代码，我收到了以下错误。在我试图将当前的日期与采摘者进行比较之前，它一直运行得很好：

[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];

接收到以下错误:由于异常NSInvalidArgumentException终止应用程序，原因：-[UIDatePicker copyWithZone:]: unrecognized selector sent to instance 0x10ba853f0。我的调试能力很差，还没有找到解决方案。

Answer 1

我相信你的问题就在这条线上。

localNotification.fireDate = datePicker;

您没有提供上面定义“datePicker”的代码，但我的猜测是，您的意思是键入"pickerDate“而不是"datePicker"，这不符合NSCopying协议(而且无论如何也不是NSDate )，这就是抛出错误的原因。