替换 NSMutableArray 中的对象包含 NSMutableDictionary 和 NSIndexSet

Question

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。所以我只使用唯一的日期（arrayDates）来检查并与当前日期（currentDate 其范围从每月的第一天到每月的最后一天）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.
        }
    }
}

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

没用。

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参考，How to indicate index of NSIndexSet object? 但对我没有帮助。

Answer 1

您可以尝试这样做：

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

哪个适合您的方便