可以寫一個加號方法,放在類別裏面
這裏我寫的是一個減號方法,直接在類裏面調用
-(NSString*)weekdayStringFromDate:(NSDate*)inputDate {
NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"星期天", @"星期一", @"星期二", @"星期三", @"星期四", @"星期五", @"星期六", nil];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/SuZhou"];
[calendar setTimeZone: timeZone];
NSCalendarUnit calendarUnit = NSWeekdayCalendarUnit;
NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];
return [weekdays objectAtIndex:theComponents.weekday];
}