重新加载数据时iOS uitableview冻结

Question

我使用 nsarray 来存储所有 tableview 单元格，在我更新单元格后，我调用了 [tableView reloadData];然后应用程序将被冻结。我怎样才能防止这种情况发生？

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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];

    NSUInteger nodeCount = _newsFeeds.count;
    if (cell == nil) {
        CustomCell *customCell = [customCells objectAtIndex:indexPath.row - 1];
        [customCell setDelegate:self];
        [customCell setSelectionStyle:UITableViewCellSelectionStyleNone];
        [customCell displayImages];
        cell = customCell;
    }
    return cell;
}


- (void)getData {
    [[BackendUtil shareInstance] getData];
}

- (void)updateData:(NSNotification *)notification {
    NSDictionary *userInfo  = notification.userInfo;
    NSMutableArray<Data *> *listOfData = [userInfo objectForKey:@"data"];
    _listOfData = listOfData;

    [self createCustomCell:listOfData completion:^(NSArray *arr) {
        customCells = [arr mutableCopy];
        [_tableView reloadData];
    }];
}

- (void)createCustomCell:(NSMutableArray<Data *> *)listOfData completion:(void(^)(NSArray *arr))completion {
    NSMutableArray *dummyArr = [[NSMutableArray alloc] init];
    for (int i = 0 ; i < [data count] ; i++) {
        Data *data = [listOfData objectAtIndex:i];
        CustomCell *customCell = [[CustomCell alloc] initWithFrame:CGRectMake(posX, posY, width, height) data:data];
        [dummyArr addObject:customCell];
    }
    completion(dummyArr);
}

Answer 1

CustomCell *customCell = [customCells objectAtIndex:indexPath.row - 1];

你为什么在这里递减 indexPath 的行？ IndexPaths 已经是从零开始的。当调用此行以获取 tableview 的第一行时，此行将向您的 NSArray 发送一个负索引，这反过来会导致您的应用程序崩溃。