UIDatePicker和NSDate

我有一个来自UIDatepicker的NSDate.

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

如何dueDate以形式检索月份int？(1月1日,2月2日等)

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

-[NSCalendar components:fromDate:]例如,使用这里的例子:

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