如何从NSDate获取月和日？

Question

如何从NSDate获取月份和日期并保存为日期？我用谷歌搜索，但没有找到解决方案。

我尝试过类似的东西但没有用 -

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd/MM"];
NSDate *dateFromString = [[NSDate alloc] init];
NSString *dateString = [arr objectAtIndex:0];
dateFromString = [dateFormatter dateFromString:dateString];

Answer 1

你可以这样做：

NSDate *theDate = ... 
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [gregorian components:NSMonthCalendarUnit | NSDayCalendarUnit
                                       fromDate:theDate];
NSInteger mm = [comps month];
NSInteger dd = [comps day];