如何让 NSArray 包含当前一周的每个日期？

Question

目前我可以获得一周的开始日期和结束日期，但我想获取整周的日期并将其放入数组中。我使用 + 1 来计算日期，但如果有跨月，它会返回错误的结果。

这是我的代码：

-(NSArray *) getWorkWeekDays:(NSDate *)date {
    NSCalendar *gregorian = [[NSCalendar alloc]        
    initWithCalendarIdentifier:NSGregorianCalendar];
    NSArray *period = [self getWorkWeekPeriod:date];//This function will return the begin and  end date of week based on the "date" parameter. return 2 Object

    NSMutableArray *weekDays = [[NSMutableArray alloc] init];
    NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit |    
    NSWeekdayCalendarUnit |
    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *bgnComps = [gregorian components:unitFlags fromDate:period[0]]
    int bgnDay = [bgnComps day];
    NSString *firstDay = [NSString stringWithFormat:@"%d",bgnDay];

    [weekDays addObject:firstDay];
    for (int i = 1; i <= 6 ;i++) {
        [ bgnComps setDay :([ bgnComps day ]  +  1 )];
        int nextDay = [bgnComps day];
        NSString *day = [NSString stringWithFormat:@"%d",nextDay];
        [weekDays addObject:day];
    }
    return weekDays;} 

//在这种情况下，当我将 2013/11/25 作为开始日期时，我会得到 2013/11/25 2013/11/26 2013/11/27 2013/11/28 2013/11/29 2013/11/30 2013/11/31

Answer 1

此代码用NSDate 对象填充一个数组，其中包含当前一周中每一天的开始时间

NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDate *beginningOfThisWeek;
NSDate *beginningOfNextWeek;

NSTimeInterval durationOfWeek;

[calendar rangeOfUnit:NSWeekCalendarUnit
            startDate:&beginningOfThisWeek
             interval:&durationOfWeek
              forDate:now];

beginningOfNextWeek = [beginningOfThisWeek dateByAddingTimeInterval:durationOfWeek];


NSDate *date = beginningOfThisWeek;
NSMutableArray *dateArray = [@[] mutableCopy];

while (![beginningOfNextWeek compare:date]  == NSOrderedSame) {
    [dateArray addObject:date];
    NSDateComponents *comps = [calendar components:NSUIntegerMax fromDate:date];
    comps.day +=1;
    date = [calendar dateFromComponents:comps];

}

代码中的问题源于您使用NSStrings 表示日期，尽管您使用NSDateComponents，但您并没有将它们转换为日期对象，而是直接转换为字符串。

如果你想用字符串表示日期，你应该使用NSDateFormatter。

---

或者，如果您对 for 循环感觉更舒服：

NSDate *now = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *beginningOfThisWeek;
NSTimeInterval durationOfWeek;

[calendar rangeOfUnit:NSWeekCalendarUnit
            startDate:&beginningOfThisWeek
             interval:&durationOfWeek
              forDate:now];


NSMutableArray *dateArray = [@[] mutableCopy];
NSDateComponents *comps = [calendar components:NSUIntegerMax fromDate:beginningOfThisWeek];

for (NSUInteger i = 0; i < 7; ++i) {
    [dateArray addObject:[calendar dateFromComponents:comps]];
    ++comps.day;
}