cordova / ios / 混合应用程序 - UITableView 加载项目不正确且无序

【问题标题】：cordova / ios / hybrid app - UITableView loads items incorrectly and out of ordercordova / ios / 混合应用程序 - UITableView 加载项目不正确且无序
【发布时间】：2019-06-27 11:28:25
【问题描述】：

我的UITableView 出现了奇怪的行为。它正在加载行0, 1, 2 - 但是当它到达行3时，它会加载行4，然后对于行4，它会再次加载行0，所以它是这样的：

表格中的行：

0
1
2
4
0

显然应该按顺序转到0, 1, 2, 3, 4。这是我的代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"cellForRowAtIndexPath getting called - row: %li", indexPath.row);

    [self.items enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        NSLog(@"items at every cell entry: %@", [obj valueForKey:@"item"]);
    }];

    //UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell1" forIndexPath:indexPath];
    //NSLog(@"indexPath.row: %li, %@", (long)indexPath.row, [self.items objectAtIndex:indexPath.row]);

    PoolsTableViewCell *cell = (PoolsTableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    if(cell.cellLeftImageView.image == nil) {

        NSInteger left = 2*indexPath.row;
        NSLog(@"left: %li", (long)left);

        NSObject* obj = (NSObject*)[self.items objectAtIndex:left];

        cell.cellLeftViewLabel.text = [obj valueForKey:@"item"];

        NSString *ImageURL = [obj valueForKey:@"downloadURL"];
        NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:ImageURL]];
        cell.cellLeftImageView.image = [UIImage imageWithData:imageData];

        NSInteger right = (2*indexPath.row)+1;
        NSLog(@"right: %li", (long)right);

        if(right < [self.items count]) {
            NSLog(@"inside right < self.items count conditional");
            NSObject* objPlus = (NSObject*)[self.items objectAtIndex:right];

            cell.cellRightViewLabel.text = [objPlus valueForKey:@"item"];

            NSString *secondImageURL = [objPlus valueForKey:@"downloadURL"];
            NSData *secondImageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:secondImageURL]];
            cell.cellRightImageView.image = [UIImage imageWithData:secondImageData];
        }
    }

    return cell;
}

我有这段代码，每次调用cellForRowAtIndex 时都会记录所有项目：

[self.items enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, 
    BOOL * _Nonnull stop) {
    NSLog(@"items at every cell entry: %@", [obj valueForKey:@"item"]);
}];

我正在将self.items 中的 2 个项目加载到每一行中（每行基本上有 2 列）。每次调用 cellForRowAtIndexPath 时，控制台输出都是正确的 - 所以永远不要乱序引用 self.items，但确实如此 - 这是我在加载 UITableView 时的控制台输出示例：

2019-02-02 22:01:30.121975-0500 HybridPool[1720:534623] cellForRowAtIndexPath getting called - row: 0
2019-02-02 22:01:30.122149-0500 HybridPool[1720:534623] items at ever cell entry: Table
2019-02-02 22:01:30.122263-0500 HybridPool[1720:534623] items at ever cell entry: Cord
2019-02-02 22:01:30.122373-0500 HybridPool[1720:534623] items at ever cell entry: Keys
2019-02-02 22:01:30.122645-0500 HybridPool[1720:534623] items at ever cell entry: Hshhdhdbd
2019-02-02 22:01:30.122769-0500 HybridPool[1720:534623] items at ever cell entry: Jhghhvhh
2019-02-02 22:01:30.122947-0500 HybridPool[1720:534623] items at ever cell entry: Book
2019-02-02 22:01:30.123054-0500 HybridPool[1720:534623] items at ever cell entry: Njhhnn
2019-02-02 22:01:30.123160-0500 HybridPool[1720:534623] items at ever cell entry: Tv
2019-02-02 22:01:30.123260-0500 HybridPool[1720:534623] items at ever cell entry: 9th item
2019-02-02 22:01:30.129478-0500 HybridPool[1720:534623] left: 0
2019-02-02 22:01:31.024184-0500 HybridPool[1720:534623] right: 1
2019-02-02 22:01:31.024302-0500 HybridPool[1720:534623] inside right < self.items count conditional
2019-02-02 22:01:31.719052-0500 HybridPool[1720:534623] cellForRowAtIndexPath getting called - row: 1
2019-02-02 22:01:31.719252-0500 HybridPool[1720:534623] items at ever cell entry: Table
2019-02-02 22:01:31.719374-0500 HybridPool[1720:534623] items at ever cell entry: Cord
2019-02-02 22:01:31.719481-0500 HybridPool[1720:534623] items at ever cell entry: Keys
2019-02-02 22:01:31.719584-0500 HybridPool[1720:534623] items at ever cell entry: Hshhdhdbd
2019-02-02 22:01:31.719687-0500 HybridPool[1720:534623] items at ever cell entry: Jhghhvhh
2019-02-02 22:01:31.719785-0500 HybridPool[1720:534623] items at ever cell entry: Book
2019-02-02 22:01:31.719884-0500 HybridPool[1720:534623] items at ever cell entry: Njhhnn
2019-02-02 22:01:31.720048-0500 HybridPool[1720:534623] items at ever cell entry: Tv
2019-02-02 22:01:31.720170-0500 HybridPool[1720:534623] items at ever cell entry: 9th item
2019-02-02 22:01:31.724875-0500 HybridPool[1720:534623] left: 2
2019-02-02 22:01:32.340747-0500 HybridPool[1720:534623] right: 3
2019-02-02 22:01:32.340969-0500 HybridPool[1720:534623] inside right < self.items count conditional
2019-02-02 22:01:32.776360-0500 HybridPool[1720:534623] cellForRowAtIndexPath getting called - row: 2
2019-02-02 22:01:32.776572-0500 HybridPool[1720:534623] items at ever cell entry: Table
2019-02-02 22:01:32.776685-0500 HybridPool[1720:534623] items at ever cell entry: Cord
2019-02-02 22:01:32.776877-0500 HybridPool[1720:534623] items at ever cell entry: Keys
2019-02-02 22:01:32.777113-0500 HybridPool[1720:534623] items at ever cell entry: Hshhdhdbd
2019-02-02 22:01:32.777244-0500 HybridPool[1720:534623] items at ever cell entry: Jhghhvhh
2019-02-02 22:01:32.777344-0500 HybridPool[1720:534623] items at ever cell entry: Book
2019-02-02 22:01:32.777443-0500 HybridPool[1720:534623] items at ever cell entry: Njhhnn
2019-02-02 22:01:32.777542-0500 HybridPool[1720:534623] items at ever cell entry: Tv
2019-02-02 22:01:32.777641-0500 HybridPool[1720:534623] items at ever cell entry: 9th item
2019-02-02 22:01:32.782148-0500 HybridPool[1720:534623] left: 4
2019-02-02 22:01:33.383439-0500 HybridPool[1720:534623] right: 5
2019-02-02 22:01:33.383649-0500 HybridPool[1720:534623] inside right < self.items count conditional
2019-02-02 22:01:34.534761-0500 HybridPool[1720:534623] cellForRowAtIndexPath getting called - row: 3
2019-02-02 22:01:34.534980-0500 HybridPool[1720:534623] items at ever cell entry: Table
2019-02-02 22:01:34.535099-0500 HybridPool[1720:534623] items at ever cell entry: Cord
2019-02-02 22:01:34.535206-0500 HybridPool[1720:534623] items at ever cell entry: Keys
2019-02-02 22:01:34.535310-0500 HybridPool[1720:534623] items at ever cell entry: Hshhdhdbd
2019-02-02 22:01:34.535412-0500 HybridPool[1720:534623] items at ever cell entry: Jhghhvhh
2019-02-02 22:01:34.535666-0500 HybridPool[1720:534623] items at ever cell entry: Book
2019-02-02 22:01:34.535787-0500 HybridPool[1720:534623] items at ever cell entry: Njhhnn
2019-02-02 22:01:34.535895-0500 HybridPool[1720:534623] items at ever cell entry: Tv
2019-02-02 22:01:34.536022-0500 HybridPool[1720:534623] items at ever cell entry: 9th item
2019-02-02 22:01:34.540261-0500 HybridPool[1720:534623] left: 6
2019-02-02 22:01:35.090979-0500 HybridPool[1720:534623] right: 7
2019-02-02 22:01:35.091111-0500 HybridPool[1720:534623] inside right < self.items count conditional
2019-02-02 22:01:35.886101-0500 HybridPool[1720:534623] cellForRowAtIndexPath getting called - row: 4
2019-02-02 22:01:35.886329-0500 HybridPool[1720:534623] items at ever cell entry: Table
2019-02-02 22:01:35.886446-0500 HybridPool[1720:534623] items at ever cell entry: Cord
2019-02-02 22:01:35.886554-0500 HybridPool[1720:534623] items at ever cell entry: Keys
2019-02-02 22:01:35.886658-0500 HybridPool[1720:534623] items at ever cell entry: Hshhdhdbd
2019-02-02 22:01:35.886978-0500 HybridPool[1720:534623] items at ever cell entry: Jhghhvhh
2019-02-02 22:01:35.887082-0500 HybridPool[1720:534623] items at ever cell entry: Book
2019-02-02 22:01:35.887184-0500 HybridPool[1720:534623] items at ever cell entry: Njhhnn
2019-02-02 22:01:35.887311-0500 HybridPool[1720:534623] items at ever cell entry: Tv
2019-02-02 22:01:35.887449-0500 HybridPool[1720:534623] items at ever cell entry: 9th item
2019-02-02 22:01:35.891688-0500 HybridPool[1720:534623] left: 8
2019-02-02 22:01:36.660758-0500 HybridPool[1720:534623] right: 9
2019-02-02 22:01:36.931630-0500 HybridPool[1720:534623] Item added! pool

为了澄清我在表格中看到的self.items 中的项目名称，如下所示：

**Row 0:**
Table, Cord
**Row 1:**
Keys, Hshhdhdbd
**Row 2:**
Jhghhvhh, Book
**Row 3:**
9th item, (blank - because there are only 9 items - not an even 10) --> this row should be last!
**Row 4:**
Table, Cord <- this is the first row again, this should be what is in **Row 3** - 9th item, blank.

我也应该显示这个，以防我在这里做错了什么：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    if([self.items count] % 2 != 0) {
        return ([self.items count] + 1) / 2;
    }
    else {
        return [self.items count] / 2;
    }
}

对于上述情况，因为我将两个项目加载到行中，所以当项目数量为偶数时我会处理这种情况（这只是将[self.items count] 除以2。对于奇数数量的self.items，我在除以2 之前添加1，以便最后一项可用的行（然后该行中的一个位置留空）。这对我来说似乎是正确的，但也许我在这里遗漏了一些棘手的错误?

从控制台输出来看，我不知道为什么行被乱序加载，或者为什么Row 0 重复Row 4，请帮忙，谢谢！

更新

用这个得到同样的结果：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"cellForRowAtIndexPath getting called - row: %li", indexPath.row);

    [self.leftItems enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        NSLog(@"leftItem: %@", [obj valueForKey:@"item"]);
    }];

    [self.rightItems enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        NSLog(@"rightItem: %@", [obj valueForKey:@"item"]);
    }];

    //UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell1" forIndexPath:indexPath];
    //NSLog(@"indexPath.row: %li, %@", (long)indexPath.row, [self.items objectAtIndex:indexPath.row]);

    PoolsTableViewCell *cell = (PoolsTableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    if(cell.cellLeftImageView.image == nil) { //Equivalent to cell == nil
        NSObject* leftObj = [self.leftItems objectAtIndex:indexPath.row];
        NSObject* rightObj = [self.rightItems objectAtIndex:indexPath.row];

        cell.cellLeftViewLabel.text = [leftObj valueForKey:@"item"];

        NSString *ImageURL = [leftObj valueForKey:@"downloadURL"];
        NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:ImageURL]];
        cell.cellLeftImageView.image = [UIImage imageWithData:imageData];

        if(![rightObj isEqual:[NSNull null]]) {
            cell.cellRightViewLabel.text = [rightObj valueForKey:@"item"];

            NSString *secondImageURL = [rightObj valueForKey:@"downloadURL"];
            NSData *secondImageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:secondImageURL]];
            cell.cellRightImageView.image = [UIImage imageWithData:secondImageData];
        }
        else {
            cell.cellRightViewLabel.text = @"";
            cell.cellRightImageView.image = nil;
        }
    }

    return cell;
}

控制台输出：

2019-02-03 11:32:50.583214-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 0
2019-02-03 11:32:50.583377-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:32:50.583486-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:32:50.583605-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:32:50.583997-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:32:50.584116-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:32:50.584224-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:32:50.584328-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:32:50.584429-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:32:50.584528-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:32:50.584771-0500 HybridPool[1827:594545] rightItem: <null>
2019-02-03 11:32:54.647304-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 1
2019-02-03 11:32:54.647551-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:32:54.647666-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:32:54.647773-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:32:54.647876-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:32:54.647992-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:32:54.648102-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:32:54.648199-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:32:54.648403-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:32:54.648519-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:32:54.648769-0500 HybridPool[1827:594545] rightItem: <null>
2019-02-03 11:32:56.447403-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 2
2019-02-03 11:32:56.447610-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:32:56.447724-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:32:56.447829-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:32:56.447931-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:32:56.448151-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:32:56.448281-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:32:56.448389-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:32:56.448490-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:32:56.448589-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:32:56.448689-0500 HybridPool[1827:594545] rightItem: <null>
2019-02-03 11:32:57.981261-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 3
2019-02-03 11:32:57.981471-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:32:57.981625-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:32:57.981745-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:32:57.981874-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:32:57.982081-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:32:57.982214-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:32:57.982315-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:32:57.982441-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:32:57.982539-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:32:57.982638-0500 HybridPool[1827:594545] rightItem: <null>
2019-02-03 11:33:00.735076-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 4
2019-02-03 11:33:00.735252-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:33:00.735337-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:33:00.735410-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:33:00.735480-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:33:00.735547-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:33:00.735692-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:33:00.735762-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:33:00.735830-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:33:00.735896-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:33:00.735965-0500 HybridPool[1827:594545] rightItem: <null>
2019-02-03 11:33:01.876340-0500 HybridPool[1827:594545] Item added! pool
2019-02-03 11:33:03.352399-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 3
2019-02-03 11:33:03.352967-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:33:03.353179-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:33:03.353377-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:33:03.353569-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:33:03.353755-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:33:03.353897-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:33:03.354230-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:33:03.354612-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:33:03.354739-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:33:03.354848-0500 HybridPool[1827:594545] rightItem: <null>
2019-02-03 11:33:03.477654-0500 HybridPool[1827:594545] cellForRowAtIndexPath getting called - row: 4
2019-02-03 11:33:03.477863-0500 HybridPool[1827:594545] leftItem: Table
2019-02-03 11:33:03.477974-0500 HybridPool[1827:594545] leftItem: Keys
2019-02-03 11:33:03.478078-0500 HybridPool[1827:594545] leftItem: Jhghhvhh
2019-02-03 11:33:03.478178-0500 HybridPool[1827:594545] leftItem: Njhhnn
2019-02-03 11:33:03.478276-0500 HybridPool[1827:594545] leftItem: 9th item
2019-02-03 11:33:03.478374-0500 HybridPool[1827:594545] rightItem: Cord
2019-02-03 11:33:03.478472-0500 HybridPool[1827:594545] rightItem: Hshhdhdbd
2019-02-03 11:33:03.478569-0500 HybridPool[1827:594545] rightItem: Book
2019-02-03 11:33:03.478665-0500 HybridPool[1827:594545] rightItem: Tv
2019-02-03 11:33:03.478763-0500 HybridPool[1827:594545] rightItem: <null>

【问题讨论】：

    标签： ios objective-c uitableview cordova delegates


    【解决方案1】：

    tableview 中的视图可以重复使用，因此您对视图所做的所有操作也必须撤消。我的规则是任何涉及可重用视图的代码都不能在没有else 的情况下拥有if。话虽这么说：

    if(cell.cellLeftImageView.image == nil) {

    是一个错误。第一次会正确设置视图，但第二次，当视图被重用时，它根本不会设置。

    如果：

    if(right < [self.items count]) {

    也是一个错误。如果没有正确的项目，它不会将图像设置为零，而是会保留之前存在的任何图像。

    还有一个数据源，其中奇数和偶数意味着完全不同的东西真的很难跟踪和理解。你为什么要那样做？您可以拥有具有leftImageURL、rightImageURL、leftText、rightText 的对象。编码的一部分是与其他程序员沟通，而不是与编译者沟通。选择一个更易于理解的数据构造函数可以大大有助于使代码达到您的预期。

    接下来，您将使用dataWithContentsOfURL 在您请求图像时阻塞主线程。我认为这只是文本代码，并不打算以任何严肃的方式使用。

    另外，你为什么使用valueForKey？ items 的类型是什么？如果它们是字典，你可以使用 item[@"downloadURL"]，如果它们是一些自定义对象，你应该可以只使用 item.downloadURL。

    【讨论】：

    • 我不认为“聪明”与它有任何关系，它更多的是关于你在开发中的进展与你正在做的事情......话虽这么说：if(cell.cellLeftImageView.image == nil) { 确保出队的任何行都是空的......并且if(right &lt; [self.items count]) { 确保有一个项目放置在数组的右侧......这真的不难理解为什么我需要这样做...... .我可以将它们分成两个数组...但是如果我不这样做...我会在您所说的else 条件中放入什么？
    • if(cell.cellLeftImageView.image == nil) { 在这种情况下类似于if(cell == nil) （如果我没有在每行中放置两个项目，这样可以防止单元格被意外重用，就像你说的那样......而且你不会使用if(cell == nil)时需要else...
    • 如果我确实将它们拆分为leftItems 和rightItems，它们会出现不均匀的情况...因为有奇数个项目...明白吗？
    • 另外，这不是答案
    • 当你说拆分成leftItems和rightItems时，你的意思是并排使用两个UITableViews吗？
    【解决方案2】：

    此代码为我提供了正确的配置 - leftItems 和 rightItems 是 UITableView 的左列和右列。如果给定行的右侧不存在某项，则将 [NSNull null] 作为该项的对象传递（来自rightItems）：

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"cellForRowAtIndexPath getting called - row: %li", (long)indexPath.row);

    PoolsTableViewCell *cell = (PoolsTableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"Cell"];

    if (cell == nil) {
        NSLog(@"cell == nil");
        cell = [[PoolsTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    NSURL* leftURL = [NSURL URLWithString:[[self.leftItems objectAtIndex:indexPath.row] valueForKey:@"downloadURL"]];
    [cell.cellLeftImageView sd_setImageWithURL:leftURL];
    cell.cellLeftViewLabel.text = [[self.leftItems objectAtIndex:indexPath.row] valueForKey:@"item"];

    if(![[self.rightItems objectAtIndex:indexPath.row] isEqual:[NSNull null]]) {
        NSURL* rightURL = [NSURL URLWithString:[[self.rightItems objectAtIndex:indexPath.row] valueForKey:@"downloadURL"]];
        [cell.cellRightImageView sd_setImageWithURL:rightURL];
        cell.cellRightViewLabel.text = [[self.rightItems objectAtIndex:indexPath.row] valueForKey:@"item"];
    }
    else {
        cell.cellRightImageView.image = nil;
        cell.cellRightViewLabel.text = @"";
    }

    return cell;
}

...

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    return [self.leftItems count];
}

    【讨论】：

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