[iOS]判断当前时间是否在指定的时间段内

一、问题描述

应用需要，判断当前时间是否在指定的时间段内，从而进行不同的操作

二、问题解决

用NSDateComponents、NSCalendar确定俩固定的NSDate格式的时间，然后再进行比较

/**
 * @brief 判断当前时间是否在fromHour和toHour之间。如，fromHour=8，toHour=23时，即为判断当前时间是否在8:00-23:00之间
 */
+ (BOOL)isBetweenFromHour:(NSInteger)fromHour FromMinute:(NSInteger)fromMin toHour:(NSInteger)toHour toMinute:(NSInteger)toMin
{
    NSDate *date8 = [self getCustomDateWithHour:8 andMinute:fromMin];
    NSDate *date23 = [self getCustomDateWithHour:23 andMinute:toMin];
    
    NSDate *currentDate = [NSDate date];
    
    if ([currentDate compare:date8]==NSOrderedDescending && [currentDate compare:date23]==NSOrderedAscending)
    {
        NSLog(@"该时间在 %d:%d-%d:%d 之间！", fromHour, fromMin, toHour, toMin);
        return YES;
    }
    return NO;
}

/**
 * @brief 生成当天的某个点（返回的是伦敦时间，可直接与当前时间[NSDate date]比较）
 * @param hour 如hour为“8”，就是上午8:00（本地时间）
 */
+ (NSDate *)getCustomDateWithHour:(NSInteger)hour andMinute:(NSInteger)minute
{
    //获取当前时间
    NSDate *currentDate = [NSDate date];
    NSCalendar *currentCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *currentComps = [[NSDateComponents alloc] init];
    
    NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    
    currentComps = [currentCalendar components:unitFlags fromDate:currentDate];
    
    //设置当天的某个点
    NSDateComponents *resultComps = [[NSDateComponents alloc] init];
    [resultComps setYear:[currentComps year]];
    [resultComps setMonth:[currentComps month]];
    [resultComps setDay:[currentComps day]];
    [resultComps setHour:hour];
    [resultComps setMinute:minute];
    
    NSCalendar *resultCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    return [resultCalendar dateFromComponents:resultComps];
}