PCCU YYM Objective-C

PCCUYYM.h

//
//  PCCUYYM.h
//  ClassComment
//
//  Created by FrankWu on 2014/2/17.
//  Copyright (c) 2014年 FrankWu. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface PCCUYYM : NSObject
{
    NSString *YYM;
}

- (NSString *)getYYM;
- (NSString *)getYY;
- (NSString *)getM;

@end

PCCUYYM.m

//
//  PCCUYYM.m
//  ClassComment
//
//  Created by FrankWu on 2014/2/17.
//  Copyright (c) 2014年 FrankWu. All rights reserved.
//

#import "PCCUYYM.h"

@implementation PCCUYYM

- (void)setYYM
{
    NSDateFormatter *formatter_yyyy = [[NSDateFormatter alloc] init];
    [formatter_yyyy setDateFormat:@"yyyy"];
    
    NSDateFormatter *formatter_mm = [[NSDateFormatter alloc] init];
    [formatter_mm setDateFormat:@"MM"];
    
    NSDate *dateNow = [NSDate date];
    
    NSString *yyyyStr = [NSString stringWithString:[formatter_yyyy stringFromDate:dateNow]];
    NSString *mmStr = [NSString stringWithString:[formatter_mm stringFromDate:dateNow]];
//    NSLog(@"STR - YY: %@ M: %@", yyyyStr, mmStr);
    
    int yyyyNum = [yyyyStr intValue];
    int mmNum = [mmStr intValue];
//    NSLog(@"INT - YY: %d M: %d", yyyyNum, mmNum);
    
    if (mmNum < 2) {
        //上學期
//        NSLog(@"PCCU- YY: %03d  M: %d", yyyyNum - 1911 - 1, 1);
        YYM = [NSString stringWithFormat:@"%03d%d", yyyyNum - 1911 - 1, 1];
    }
    else if (mmNum >= 8) {
        //上學期
//        NSLog(@"PCCU- YY: %03d  M: %d", yyyyNum - 1911, 1);
        YYM = [NSString stringWithFormat:@"%03d%d", yyyyNum - 1911, 1];
    }
    else if (mmNum >= 2 && mmNum < 8) {
        //下學期
//        NSLog(@"PCCU- YY: %03d  M: %d", yyyyNum - 1911 - 1, 2);
        YYM = [NSString stringWithFormat:@"%03d%d", yyyyNum - 1911 - 1, 2];
    }
}

- (NSString *)getYYM
{
    if ([YYM length] == 0) {
        [self setYYM];
    }
    return YYM;
}

- (NSString *)getYY
{
    return [[self getYYM] substringWithRange:NSMakeRange(0, 3)];
}

- (NSString *)getM
{
    return [[self getYYM] substringWithRange:NSMakeRange(3, 1)];
}

@end