UIDatePicker and NSDate

问题

I have an NSDate that I get from a UIDatepicker.

IBOutlet UIDatePicker *dueDate;
NSDate *selectedDate = [dueDate date];

How do I retrieve the month from dueDate in the form of an int? (1 for Jan, 2 for Feb, etc.)

回答1:

NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:NSMonthCalendarUnit fromDate:[dueDate date]];
NSInteger month = [components month];

回答2:

use -[NSCalendar components:fromDate:] for instance the example here:

http://developer.apple.com/iphone/library/documentation/Cocoa/Reference/Foundation/Classes/NSCalendar_Class/Reference/NSCalendar.html

回答3:

NSDateFormatter *dateFormat = [[[NSDateFormatter alloc] initWithDateFormat:@"%m" allowNaturalLanguage:NO] autorelease];
int month = [[dateFormat stringFromDate:dueDate] intValue];

来源：https://stackoverflow.com/questions/727696/uidatepicker-and-nsdate