检查自定义对象数组是否包含具有特定日期的对象 [英] Check if an array of custom objects contains an object with a certain date

问题描述

我有一组事件对象.对象有几个属性.属性之一是 NSDate eve_date.

I have an array of event objects. The object has several attributes. One of the attributes is an NSDate eve_date.

现在我想检查该对象数组是否包含某个 NSDate d

Now I want to check if that array of objects contains a certain NSDate d

我正在做以下事情

if([[matches valueForKey:@"eve_date"] containsObject:d]){
        NSLog(@"contains object");
   }else{
    NSLog(@"does not contains object");
   }

但这行不通.有人可以帮我吗?

But this is not working. Can anyone help me ?

亲切的问候

编辑

好吧，让我更清楚一点.我正在制作日历应用程序.我获取了特定月份内的所有事件.我现在需要做的是在正确的日期在我的日历上放置一个标记.因此我在一个函数中有这个.

Okay let me be more clear. I'm making a calendar app. I fetched all the events inside the particular month. What I need to do now is to place a marker on my calendar on the correct date. Therefore I have this in a function.

NSLog(@"Delegate Range: %@ %@ %d",start,end,[start daysBetweenDate:end]);

    self.dataArray = [NSMutableArray array];
    self.dataDictionary = [NSMutableDictionary dictionary];

    NSDate *d = start;
    while(YES){
        for (Event *event in matches) {
            if([event.eve_date isEqualToDate:d]){
                //  (self.dataDictionary)[d] = save event title in here
                [self.dataArray addObject:@YES]; //place marker on date 'd'


            }else{
                [self.dataArray addObject:@NO]; // don't place marker
            }
        }


        NSDateComponents *info = [d dateComponentsWithTimeZone:calendar.timeZone];
        info.day++;
        d = [NSDate dateWithDateComponents:info];
        if([d compare:end]==NSOrderedDescending) break;
    }

但现在我在我的一系列事件中循环了 31 次(每月休息的天数).(这可能不是最佳实践解决方案???)

But now I'm looping 31 times (amount of days off the month) through my array of events. (This is probably not the best practice solution ???)

我也觉得问题是日期的时间不一样.例如:

I also think that the problem is that the time of the date is not the same. For example:

eve_date --> 2013-08-13 12:00
d --> 2013-08-13 15:00

所以我可能应该使用 NSDateformatter 来只获取日期本身而不获取时间?

So I probably should use an NSDateformatter to only get the date itself without the time ?

我说得对吗?

推荐答案

我对 KVC 不是很熟悉，但是如果解决方案不需要使用 KVC，你可以迭代:

I'm not very well versed with KVC, but if the solution doesn't need to use KVC, you can just iterate:

NSDate *dateToCompare = ...;
BOOL containsObject = NO;
for (MyEvent *e in matches)
{
    if ([e.eve_date isEqualToDate:dateToCompare]) 
    { 
        containsObject = YES;
        break;
    }
}

if (containsObject) NSLog(@"Contains Object");
else NSLog(@"Doesn't contain object");

<小时>

我玩过 KVC 并尝试过解决方案.您只缺少 valueForKeyPath 而不是 valueForKey

if ([[matches valueForKeyPath:@"eve_date"] containsObject:d])
{
    NSLog(@"Contains object");
}
else
{
    NSLog(@"Does not contain object");
}

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