从UIDatePicker提取日期 [英] Extract date from UIDatePicker

问题描述

您能告诉我如何从UIDatePicker中提取日期吗，我已经提取了月份，但是我无法提取日期，请帮帮我

Can u please tell me how to extract a date from UIDatePicker, i have extracted the month but i am not able to extract the date,Please help me out

谢谢

推荐答案

只需访问对象的date属性即可提取NSDate对象:

The NSDate object can be extracted by just accessing the date property of the object:

NSDate *dateFromPicker = [someDatePicker date];  

如果要提取有关某人选择的月份，日期和年份的详细信息，则要稍微复杂一些(但仅需一点点).解决方案是使用NSCalendar参考-您可能想使用Gregorian.

If you want to extract detailed information about what month, day and year a person has chosen, this is a little bit more complex (but just a little bit). The solution is to use an NSCalendar reference - it is likely that you'd want to use Gregorian.

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];

现在，您应该使用无符号整数单位标志来指定要从日期(即日，月，日，年，时代等)中提取的单位.使用按位|选择多个单位标志:

Now you should use an unsigned integer unit flags to specify which units you want to extract from a date (i.e. day, day-of-the-month, year, era etc.). Use a bitwise | to select multiple unit flags:

unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit;

现在创建一个日期组件对象:

Now create a date components object:

NSDateComponents *components = [calendar components: unitFlags fromDate: dateFromPicker];

从此日期开始，您现在可以提取在unitFlags整数中提到的整数值:

From this components date, you can now extract integer values of what you have mentioned in the unitFlags integer:

int year = [components year];
int month = [components month];

在这样的组件对象中，所有其他属性(例如，日，月，日等)均未定义-请记住，您只能提取明确表示要提取的内容.

All other properties (i.e. day, day-of-the-month, era etc.) are undefined in such a components object - remember, you can only extract what you've explicitly said you want to extract.

最后，释放日历对象以避免内存泄漏:

Finally, free the calendar object to avoid memory leaks:

[calendar release];

希望这会有所帮助. 有关更多信息，请参阅Apple参考: http://developer.apple.com/library/ios/#documentation/可可/Conceptual/DatesAndTimes/DatesAndTimes.html

Hope this helps. For more information, see Apple reference: http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/DatesAndTimes/DatesAndTimes.html

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