UIViewController从表视图中显示 - 弹出时不被破坏

I have a table view which presents a UIViewController whenever a row is tapped (displays details for that particular row).

我有一个表视图，只要轻敲一行就显示UIViewController（显示该特定行的详细信息）。

The code is as follows :

代码如下：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath       *)indexPath 

{ 

if (!detail) {

detail = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];        

}

PlaceObject *info = [locationInfo objectAtIndex:indexPath.row];

detail.UniqueID = info.UniqueID;
detail.hidesBottomBarWhenPushed = YES;

[self.navigationController pushViewController:detail animated:YES];

self.detail = nil;
[detail release];

}

The problem is that "detail" does not seems to be destroyed when it is popped from the stack (when the user goes back to the table view).

问题是，当从堆栈中弹出“详细信息”时（当用户返回到表视图时），“详细信息”似乎没有被破坏。

I have a number of IBOutlets and Variable in the "detail" UIViewController class which I release in dealloc as follows :

我在“详细”UIViewController类中有许多IBOutlets和Variable，我在dealloc中发布如下：

- (void)dealloc
{
NSLog(@"Deallocing");

[storedURL release];
[storedNumber release];
[storedLocation release];
[nameLabel release];
[postCode release];
[description release];
[openTime release];
[nearestTube release];
[area release];
[image release];
[name release];
[phoneNumber release];
[scroll release];
[picture release];
[addressOne release];
[cost release]; 

[super dealloc];

}

Can anybody advise why "details" may not be being destroyed when the user returns to the table view ?

任何人都可以建议当用户返回表视图时为什么“细节”不会被销毁？

EDIT

编辑

Ok the above code now works perfectly. The key seemed to be setting detail to nil - not sure why though.

好的，上面的代码现在完美无缺。关键似乎是将细节设置为零 - 虽然不确定原因。

3 个解决方案

#1

Couple things:

情侣：

You are alloc/init'ing it but not releasing it. That's a problem.
你是分配/初始化它但不释放它。那是个问题。
You are setting it to a property (which is probably set to retain). That's a problem because of (1).
您将其设置为属性（可能设置为保留）。这是因为（1）的问题。

So, to fix this, release the object after you are done with in in the local scope (end of that method). And since it is a property, release it in the dealloc method of the owning class.

因此，要解决此问题，请在完成本地范围（该方法结束）之后释放对象。因为它是一个属性，所以在拥有类的dealloc方法中释放它。

#2

alloc/init - retain count: 1

alloc / init - 保留计数：1

setting with property - retain count: 2

设置属性 - 保留计数：2

pushing onto nav. controller - retain count: 3

推进导航。控制器 - 保留计数：3

popping off nav. controller - retain count: 2

弹出导航。控制器 - 保留计数：2

This is making the assumption that the property has the retain flag but either way, your retain count is never getting to 0

这假设属性具有保留标志，但无论如何，保留计数永远不会变为0

#3

Assume that detail is a retained property. Override the getter to do lazy instantiation.

假设细节是保留属性。覆盖getter以进行延迟实例化。

- (DetailViewController *)detail
{
    if (!detail)
    {
        detail = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];
        detail.hidesBottomBarWhenPushed = YES;
    }

    return detail;
}

Additionally be sure that you're sending -release to detail in -dealloc only. Your -tableView:didSelectRowAtIndexPath: now looks like this.

另外请确保您仅在-dealloc中发送-release详细信息。你的-tableView：didSelectRowAtIndexPath：现在看起来像这样。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath       *)indexPath 
{ 
    detail.UniqueID = [locationInfo objectAtIndex:indexPath.row].UniqueID;
    [self.navigationController pushViewController:self.detail animated:YES];
}

#1