Question

这是用于安排警报的以下代码，我收到以下错误。在我尝试将当前日期与选择器进行比较之前，它一直运行良好：

[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];

收到以下错误：由于未捕获的异常NSInvalidArgumentException而终止应用，原因为：-[UIDatePicker copyWithZone:]: unrecognized selector sent to instance 0x10ba853f0。我在调试方面很糟糕，还没有找到解决方案。

Answer 1

我相信你遇到的问题就在于这一行。

localNotification.fireDate = datePicker;

您没有提供定义＆＃34; datePicker＆＃34;的上述代码，但我的猜测是您打算键入＆＃34; pickerDate＆＃34;而不是＆＃34; datePicker＆＃34;，它不符合NSCopying协议（并且无论如何都不是NSDate），这就是抛出错误的原因。

UIDatePicker＆＃34; copyWithZone＆＃34;错误

1 个答案: