xcode 如何不使用 dequeueReusableCellWithIdentifier？

How to NOT use dequeueReusableCellWithIdentifier?

提问by Olico

I have a small table view, maybe 10 items max, and I do not want to use the dequeueReusableCellWithIdentifiermethod. The reason is, each time I'm scrolling the table view, I have the first row in place of the last row, which take few second to update back to get update back with the last row.

我有一个小表格视图，最多可能有 10 个项目，我不想使用该dequeueReusableCellWithIdentifier方法。原因是，每次我滚动表格视图时，我都会用第一行代替最后一行，这需要几秒钟的时间来更新以获取最后一行的更新。

I'm using a prototype cell and i try to remove the :

我正在使用原型单元格，并尝试删除：

JsonTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

but it return blank cells in table view.

但它在表格视图中返回空白单元格。

So here is my code :

所以这是我的代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = @"Cell";

JsonTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell=[[JsonTableViewCell alloc]initWithStyle:
          UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}

I also try to keep the

我也尽量保持

JsonTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

and configure the cell like:

并配置单元，如：

if (cell == nil) {
    cell.title.text = titleStrip;
}

but in this case, I've got the prototype cell as it is in the storyboard. It's not blank, but not filled with data.

但在这种情况下，我有原型单元，因为它在故事板中。它不是空白，而是没有填充数据。

Anybody can tell me what I am doing wrong?

谁能告诉我我做错了什么？

UPDATE **** 10.10.2014 *******

更新 **** 10.10.2014 *******

Here is maybe the all code would help :

以下是所有代码可能会有所帮助：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return myObject.count;
}



(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = @"Cell";

JsonTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell=[[JsonTableViewCell alloc]initWithStyle:
        UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);
dispatch_async(queue, ^{

NSDictionary *tmpDict = [myObject objectAtIndex:indexPath.row];

NSMutableString *text;
text = [NSMutableString stringWithFormat:@"%@",
        [tmpDict objectForKeyedSubscript:title]];

NSMutableString *detail;
detail = [NSMutableString stringWithFormat:@"%@ ",
          [tmpDict objectForKey:content]];

NSURL *url = [NSURL URLWithString:[tmpDict objectForKey:thumbnail]];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [[UIImage alloc]initWithData:data];

NSString *titleStrip = [[text description] stringByReplacingOccurrencesOfString:@""withString:@""];

NSString *detailStrip = [[detail description] stringByReplacingOccurrencesOfString:@""withString:@""];

dispatch_sync(dispatch_get_main_queue(), ^{

cell.titreNews.text = titleStrip;

cell.detailNews.textAlignment = NSTextAlignmentJustified;

cell.detailNews.text = detailStrip;

UIImage *image0 = [UIImage imageNamed:@"video.png"];

if (img != nil) {
    cell.imageNews.image = img;
}
else {
    cell.imageNews.image = image0;
}

});
});

[cell setAccessoryType:UITableViewCellAccessoryNone];

return cell;
}

回答by Nerrolken

First of all, welcome to Stack Overflow!

首先，欢迎来到 Stack Overflow！

Second, I highlyrecommend against disabling dequeuing. Apple is famously strict when it comes to expected behaviors, and trying to re-work a basic UI element like a TableView to work in a different way could easily get your app rejected. Plus, dequeuing is a good thing, which helps keep memory usage down and streamlines things in general. It's far, far better to find a way to design your own code so it works with the dequeuing process as it is intended to work.

其次，我强烈建议不要禁用出列。Apple 在预期行为方面是出了名的严格，并且尝试重新设计基本 UI 元素（如 TableView）以使其以不同方式工作很容易让您的应用程序被拒绝。另外，出队是一件好事，它有助于降低内存使用量并总体上简化事情。找到一种方法来设计您自己的代码，以便它按照预期的方式与出队过程一起工作，这要好得多。

That being said, as I understand it all you need to do is omit the dequeueReusableCellWithIdentifierline, and it should work. cellwill be nileach time, and will thus get re-initialized each time from scratch.

话虽如此，据我所知，您需要做的就是省略该dequeueReusableCellWithIdentifier行，它应该可以工作。 cell将nil每一次，因此将获得每次都从头开始重新初始化。

回答by Fruity Geek

This block of code is never called because you instantiate a cell before it (cell is never nil).

这段代码永远不会被调用，因为你在它之前实例化了一个单元格（单元格永远不会为零）。

if (cell == nil) {
    cell.title.text = titleStrip;
}

Don't call the dequeue methods if you aren't using them. Change your method to this:

如果您不使用出列方法，请不要调用它们。将您的方法更改为：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    //Don't even try to dequeue, just create new cell instance
    JsonTableViewCell *cell = [[JsonTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
    cell.title.text = titleStrip;
    return cell;
}