在網上搜索以後整理了一下，以備後續檢視

- (NSString *)getDateYearMonth {

    NSDate *newDate = [NSDate date];

NSCalendar *calendar = [NSCalendarcurrentCalendar];

NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth;

    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:newDate];

    NSInteger

    NSInteger month = [dateComponent month];

return [NSStringstringWithFormat:@"%ld-%ld",year,month];

}