0

我有一个主数组 ( arrayEvents) 包含事件列表，其中包含 start_date、event_id、event_name 等字段，许多事件可以在同一日期但不同时间发生。因此，我只使用唯一日期 ( arrayDates) 来检查并将其与当前日期（currentDate其范围从一个月的第一天到一个月的最后一天）进行比较，以显示特定日期的事件。我到此为止。现在我的问题是，我需要更新arrayEvents以供以后比较，所以我应用以下逻辑...but I am in the middle of the sea并且不知道去哪里！

for(int i=0;i<[arrayDates count];i++) {
    NSDate *obj = [arrayDates objectAtIndex:i];
    if([obj isEqualToDate:currentDate]) {
        //This date has some events, we've done up to here.
        //Now taking indexes of same objects (that's same dates objects) from the arrayEvents
        NSIndexSet *indexesOfObjects = [arrayDates indexesOfObjectsPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
            return [arrayEvents containsObject:obj];
        }];
        if([indexesOfObjects count] > 1) {
            //We found some objects into arrayEvents, now I have to update
            //those objects into arrayEvents.
            //How to achieve this?

            //My plan was to iterate each indexes and make update on arrayEvents 
            //but I can't do this, as I don't have access to each index from NSIndexSet.
        }
    }
}

[[arrayEvents objectsAtIndexes:indexesOfObjects] 
setValue:[arrayDates objectAtIndex:i] forKey:@"filter_date"];

不工作。

参考，如何指示 NSIndexSet 对象的索引？但对我没有帮助。

4

1 回答 1

0

你可以尝试做这样的事情：

NSMutableDictionary *dict=[[NSMutableDictionary alloc]initWithDictionary:[arrayEvents objectAtIndex:indexPath.row]];

[dict setValue:[arrayDates objectAtIndex:i] forKey:@"filter_date"];

[arrayEvents replaceObjectAtIndex:indexPath.row withObject:dict];

或者你可以使用

replaceObjectsAtIndexes:(NSIndexSet *) withObjects:(NSArray *)a

哪一个适合您的方便

于 2014-07-23T12:09:40.783 回答