iOS 每天某些时间点做某些事情

#pragma mark  --  判断是否弹出广告
- (BOOL)isLoadAdvertIn
{
    //当前时间戳
    NSTimeInterval interval = [[NSDate date] timeIntervalSince1970];
    
    NSTimeInterval time00 = [GDDateUtil setCurrentlyDaySetHour:00 setMinute:00 setSec:00];//当前天00点的时间戳
    NSTimeInterval time12 = [GDDateUtil setCurrentlyDaySetHour:12 setMinute:00 setSec:00];//当前天12点的时间戳
    NSTimeInterval time14 = [GDDateUtil setCurrentlyDaySetHour:14 setMinute:00 setSec:00];//当前天14点的时间戳
    NSTimeInterval time24 = [GDDateUtil setCurrentlyDaySetHour:24 setMinute:00 setSec:00];//当前天24点的时间戳
    
    if (interval > time00 && interval < time12) {//时间段是00 - 12 点之间
        //这样判断当前时间绝对是00点以后 interval > time00
        //interval < time12 只要符合 则当前时间就在上午12点之前
        
        
        if (![[[NSUserDefaults standardUserDefaults] objectForKey:@"KamYES"] isEqualToString:[NSString stringWithFormat:@"%@Kam",[GDDateUtil stringFromDateSetDateFormat:@"yyMMdd"]]]) {
            //在NSUserDefaults 取值KamYES 判断今天上午是否启动过
            
            [[NSUserDefaults standardUserDefaults] setObject:[NSString stringWithFormat:@"%@Kam",[GDDateUtil stringFromDateSetDateFormat:@"yyMMdd"]] forKey:@"KamYES"];
            //满足这个条件说明没有启动过，将今天的值存放，则返回YES
            return YES;
        }
        return NO;
    }else if (interval > time14 && interval < time24){//时间在12 - 24点之间
        //interval < time24 当前的时间绝对要小于24点，如果大于了 则是另外一天，因为[GDDateUtil setCurrentlyDaySetHour:xx setMinute:xx setSec:xx]方法是获取当天的时间，所以不会出现interval>time24的情况
        //interval > time14 说明当前时间为14点之后
        
        if (![[[NSUserDefaults standardUserDefaults] objectForKey:@"KpmYES"] isEqualToString:[NSString stringWithFormat:@"%@Kpm",[GDDateUtil stringFromDateSetDateFormat:@"yyMMdd"]]]) {
            //在NSUserDefaults 取值KpmYES 判断今天下午是否启动过
            
            [[NSUserDefaults standardUserDefaults] setObject:[NSString stringWithFormat:@"%@Kpm",[GDDateUtil stringFromDateSetDateFormat:@"yyMMdd"]] forKey:@"KpmYES"];
            //满足这个条件说明没有启动过，将今天的值存放，则返回YES
        }
        return NO;
    }
    return NO;
}

/**
 *  获取当前天数时间几点几分的时间戳
 *
 *  @return return 时间戳
 */
+ (NSTimeInterval)setCurrentlyDaySetHour:(NSInteger)hour setMinute:(NSInteger)minute setSec:(NSInteger)sec
{
    if (hour == 24) {//如果是24时，则是第二天的00点，所以做细微处理
        hour = 23;
        minute = 59;
        sec = 59;
    }
    NSCalendar *greCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    
    NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];
    [greCalendar setTimeZone: timeZone];
    
    NSDateComponents *dateComponents = [greCalendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay  fromDate:[NSDate date]];
    
    //  定义一个NSDateComponents对象，设置一个时间点
    NSDateComponents *dateComponentsForDate = [[NSDateComponents alloc] init];
    [dateComponentsForDate setDay:dateComponents.day];
    [dateComponentsForDate setMonth:dateComponents.month];
    [dateComponentsForDate setYear:dateComponents.year];
    [dateComponentsForDate setHour:hour];
    [dateComponentsForDate setMinute:minute];
    [dateComponentsForDate setSecond:sec];
    
    NSDate *dateFromDateComponentsForDate = [greCalendar dateFromComponents:dateComponentsForDate];
  
    return [dateFromDateComponentsForDate timeIntervalSince1970];
}

/**
 *  获取时间，并转换为字符串
 *
 *  @return return 返回字符串
 */
+ (NSString *)stringFromDateSetDateFormat:(NSString *)formatString
{
    NSDate *date =[NSDate date];
    NSDateFormatter *formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:formatString];//设置时间显示的格式，此处使用的formater格式要与字符串格式完全一致，否则转换失败
    NSString *dateStr = [formater stringFromDate:date];//将日期转换成字符串
    return dateStr;
}