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为什么 UITableView 对其委托进行如此多的调用？数据源？

发布于 2024-08-15 07:11:51 字数 7839 浏览 2 评论 0原文

任何人都愿意解释为什么 UITableView 对其委托和代理进行如此多的重复调用。正在设置的数据源？看看我现在正在处理的一个，我发现 numberOfSectionsInTableView 被调用了 3 次，然后 viewForHeaderInSection 对每个部分又循环了 3 次（我有 2 个部分，因此在第一次显示之前总共 6 次）...所有这些都在第一个屏幕渲染之前。

我意识到 API 是私有的，但想知道是否有人愿意提供一些关于此设计模式的见解以及可能发生的情况在幕后，所以我可能会了解一两件事，为什么在这种情况下如此多的重复被认为是可以接受的（甚至是有利的）……或者更可能的是，我是如何设法搞砸应用它的。

编辑：在 RootViewController tableView 第一次显示之前添加堆栈跟踪

第一次调用 viewForHeaderInSection:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c8f6f4 in -[UISectionRowData refreshWithSection:tableView:tableViewRowData:]
#3  0x30c8f5a8 in -[UITableViewRowData rectForFooterInSection:]
#4  0x30c3d430 in -[UITableViewRowData heightForTable]
#5  0x30c05430 in -[UITableView(_UITableViewPrivate) _updateContentSize]
#6  0x30c3ce0c in -[UITableView noteNumberOfRowsChanged]
#7  0x30c3c7c0 in -[UITableView reloadData]
#8  0x30e50e60 in -[UITableViewController viewWillAppear:]
#9  0x30c78810 in -[UINavigationController _startTransition:fromViewController:toViewController:]
#10 0x30c783b0 in -[UINavigationController _startDeferredTransitionIfNeeded]
#11 0x30c782a0 in -[UINavigationController viewWillLayoutSubviews]
#12 0x30c5c874 in -[UILayoutContainerView layoutSubviews]
#13 0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#14 0x33e871c0 in -[CALayer layoutSublayers]
#15 0x33e86edc in CALayerLayoutIfNeeded
#16 0x33e86844 in CA::Context::commit_transaction
#17 0x33e86474 in CA::Transaction::commit
#18 0x33e8e5dc in CA::Transaction::observer_callback
#19 0x32d5c830 in __CFRunLoopDoObservers
#20 0x32da4346 in CFRunLoopRunSpecific
#21 0x32da3c1e in CFRunLoopRunInMode
#22 0x31bb9374 in GSEventRunModal
#23 0x30bf3c30 in -[UIApplication _run]
#24 0x30bf2230 in UIApplicationMain
#25 0x00002260 in main at main.m:14

第二次调用:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c8f6f4 in -[UISectionRowData refreshWithSection:tableView:tableViewRowData:]
#3  0x30c90628 in -[UITableViewRowData(UITableViewRowDataPrivate) _ensureSectionOffsetIsValidForSection:]
#4  0x30c8f5d0 in -[UITableViewRowData rectForFooterInSection:]
#5  0x30c3d430 in -[UITableViewRowData heightForTable]
#6  0x30c05430 in -[UITableView(_UITableViewPrivate) _updateContentSize]
#7  0x30c3ce0c in -[UITableView noteNumberOfRowsChanged]
#8  0x30c3c7c0 in -[UITableView reloadData]
#9  0x30e50e60 in -[UITableViewController viewWillAppear:]
#10 0x30c78810 in -[UINavigationController _startTransition:fromViewController:toViewController:]
#11 0x30c783b0 in -[UINavigationController _startDeferredTransitionIfNeeded]
#12 0x30c782a0 in -[UINavigationController viewWillLayoutSubviews]
#13 0x30c5c874 in -[UILayoutContainerView layoutSubviews]
#14 0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#15 0x33e871c0 in -[CALayer layoutSublayers]
#16 0x33e86edc in CALayerLayoutIfNeeded
#17 0x33e86844 in CA::Context::commit_transaction
#18 0x33e86474 in CA::Transaction::commit
#19 0x33e8e5dc in CA::Transaction::observer_callback
#20 0x32d5c830 in __CFRunLoopDoObservers
#21 0x32da4346 in CFRunLoopRunSpecific
#22 0x32da3c1e in CFRunLoopRunInMode
#23 0x31bb9374 in GSEventRunModal
#24 0x30bf3c30 in -[UIApplication _run]
#25 0x30bf2230 in UIApplicationMain
#26 0x00002260 in main at main.m:14

第三次调用:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c3eebc in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

第四次调用：

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c9712c in -[UITableView(UITableViewInternal) _sectionHeaderViewWithFrame:forSection:opaque:reuseViewIfPossible:]
#2  0x30c3f0b4 in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

第五次调用：

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c3eebc in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

第六次调用：

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c9712c in -[UITableView(UITableViewInternal) _sectionHeaderViewWithFrame:forSection:opaque:reuseViewIfPossible:]
#2  0x30c3f0b4 in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14
原文

Anyone care to shed some light on why UITableView makes so many repeat calls to its delegate & datasource as it's being setup? Just looking at one I'm working on now I see that numberOfSectionsInTableView is called 3 times and then viewForHeaderInSection cycles through 3 more times for each section (I have 2 sections so total of 6 times before being displayed for first time)...all before the first screen is even rendered.

I realize that the API is private but wondering if someone might be willing to offer up some insight into this design pattern and what might be going on behind the scenes so I might learn a thing or two about why so much repetition is considered acceptable (or even advantageous) in this case...or, more likely, how I've managed to foul up applying it.

Edit: Added stack traces before RootViewController tableView is shown for first time

1st time calling viewForHeaderInSection:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c8f6f4 in -[UISectionRowData refreshWithSection:tableView:tableViewRowData:]
#3  0x30c8f5a8 in -[UITableViewRowData rectForFooterInSection:]
#4  0x30c3d430 in -[UITableViewRowData heightForTable]
#5  0x30c05430 in -[UITableView(_UITableViewPrivate) _updateContentSize]
#6  0x30c3ce0c in -[UITableView noteNumberOfRowsChanged]
#7  0x30c3c7c0 in -[UITableView reloadData]
#8  0x30e50e60 in -[UITableViewController viewWillAppear:]
#9  0x30c78810 in -[UINavigationController _startTransition:fromViewController:toViewController:]
#10 0x30c783b0 in -[UINavigationController _startDeferredTransitionIfNeeded]
#11 0x30c782a0 in -[UINavigationController viewWillLayoutSubviews]
#12 0x30c5c874 in -[UILayoutContainerView layoutSubviews]
#13 0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#14 0x33e871c0 in -[CALayer layoutSublayers]
#15 0x33e86edc in CALayerLayoutIfNeeded
#16 0x33e86844 in CA::Context::commit_transaction
#17 0x33e86474 in CA::Transaction::commit
#18 0x33e8e5dc in CA::Transaction::observer_callback
#19 0x32d5c830 in __CFRunLoopDoObservers
#20 0x32da4346 in CFRunLoopRunSpecific
#21 0x32da3c1e in CFRunLoopRunInMode
#22 0x31bb9374 in GSEventRunModal
#23 0x30bf3c30 in -[UIApplication _run]
#24 0x30bf2230 in UIApplicationMain
#25 0x00002260 in main at main.m:14

2nd call:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c8f6f4 in -[UISectionRowData refreshWithSection:tableView:tableViewRowData:]
#3  0x30c90628 in -[UITableViewRowData(UITableViewRowDataPrivate) _ensureSectionOffsetIsValidForSection:]
#4  0x30c8f5d0 in -[UITableViewRowData rectForFooterInSection:]
#5  0x30c3d430 in -[UITableViewRowData heightForTable]
#6  0x30c05430 in -[UITableView(_UITableViewPrivate) _updateContentSize]
#7  0x30c3ce0c in -[UITableView noteNumberOfRowsChanged]
#8  0x30c3c7c0 in -[UITableView reloadData]
#9  0x30e50e60 in -[UITableViewController viewWillAppear:]
#10 0x30c78810 in -[UINavigationController _startTransition:fromViewController:toViewController:]
#11 0x30c783b0 in -[UINavigationController _startDeferredTransitionIfNeeded]
#12 0x30c782a0 in -[UINavigationController viewWillLayoutSubviews]
#13 0x30c5c874 in -[UILayoutContainerView layoutSubviews]
#14 0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#15 0x33e871c0 in -[CALayer layoutSublayers]
#16 0x33e86edc in CALayerLayoutIfNeeded
#17 0x33e86844 in CA::Context::commit_transaction
#18 0x33e86474 in CA::Transaction::commit
#19 0x33e8e5dc in CA::Transaction::observer_callback
#20 0x32d5c830 in __CFRunLoopDoObservers
#21 0x32da4346 in CFRunLoopRunSpecific
#22 0x32da3c1e in CFRunLoopRunInMode
#23 0x31bb9374 in GSEventRunModal
#24 0x30bf3c30 in -[UIApplication _run]
#25 0x30bf2230 in UIApplicationMain
#26 0x00002260 in main at main.m:14

3rd call:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c3eebc in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

4th call:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c9712c in -[UITableView(UITableViewInternal) _sectionHeaderViewWithFrame:forSection:opaque:reuseViewIfPossible:]
#2  0x30c3f0b4 in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

5th call:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c901a8 in -[UITableView(UITableViewInternal) _delegateWantsHeaderForSection:]
#2  0x30c3eebc in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

6th call:

#0  0x000086cc in -[RootViewController tableView:viewForHeaderInSection:] at RootViewController.m:444
#1  0x30c9712c in -[UITableView(UITableViewInternal) _sectionHeaderViewWithFrame:forSection:opaque:reuseViewIfPossible:]
#2  0x30c3f0b4 in -[UITableView(_UITableViewPrivate) _updateVisibleHeadersAndFootersNow]
#3  0x30c3e578 in -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow]
#4  0x30c3c514 in -[UITableView layoutSubviews]
#5  0x30c382d8 in -[UIView(CALayerDelegate) _layoutSublayersOfLayer:]
#6  0x33e871c0 in -[CALayer layoutSublayers]
#7  0x33e86edc in CALayerLayoutIfNeeded
#8  0x33e86844 in CA::Context::commit_transaction
#9  0x33e86474 in CA::Transaction::commit
#10 0x33e8e5dc in CA::Transaction::observer_callback
#11 0x32d5c830 in __CFRunLoopDoObservers
#12 0x32da4346 in CFRunLoopRunSpecific
#13 0x32da3c1e in CFRunLoopRunInMode
#14 0x31bb9374 in GSEventRunModal
#15 0x30bf3c30 in -[UIApplication _run]
#16 0x30bf2230 in UIApplicationMain
#17 0x00002260 in main at main.m:14

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评论（2）

坏尐絯 2024-08-22 07:11:51

在我的代码中，仅调用 numberOfSectionsInTableView 一次，以响应 reloadData 调用。

您可以在 numberOfSectionsInTableView 中设置断点，然后查看调用堆栈以了解调用方式和原因。

In my code numberOfSectionsInTableView is only called once, in response to a reloadData call.

You can set a breakpoint in numberOfSectionsInTableView and look at the call stack to see how and why it's being called.

回复 原文
梦初启 2024-08-22 07:11:51

它频繁调用它们的原因之一是，每次出现 [... reloadData] 或其他任何情况时，事情都会发生巨大变化，因此它不能做出任何假设，认为事情与您上次调用它们时一样。例如，这是他们在文档中大力缓存 UITableViewCells 的原因之一。

这是一个演示这一点的类：

@interface WinnersViewController : UITableViewController {
}
- (void)setDataSourceAndDelegate;
@end

在我的 viewDidLoad 中，我调用一个名为 setDataSourceAndDelegate 的方法，该方法将三个类之一设置为表视图上的数据源和委托属性。

<代码>

- (void)viewDidLoad {
    [self setDataSourceAndDelegate];
    [super viewDidLoad];
}

我有三个不同的对象，它们充当我使用的数据源和委托（组合），上面有一个抽象类：（

WinnersViewDefaultDSD
WinnersViewHasLocationDSD
WinnersViewHasExampleDSD

出于明显的原因，我已将有问题的实际类名替换为示例。）

现在这些类返回非常不同的结果事物到表视图，有时当我的应用程序的状态发生变化时（例如调用 CoreLocation 或用户选择类示例的实例）， setDataSourceAndDelegate 方法会再次被调用，并且它可以更改哪个对象因此

，UITableView 在其委托和数据源上调用如此多的东西的原因是因为它需要支持开发人员使用表视图执行此类操作，如果某些方法被调用一次，然后假设答案不变，它不会那么灵活。

无论如何，希望这是一个有用的例子

（哦，如果有人要模仿这个，请注意 TableView 上的委托和数据源属性是复制的而不是保留的。你必须对 DSD 类的实例进行额外的保留，否则你会遇到神秘但频繁的崩溃。）

（此外，我需要重写各种 DSD 子类的 viewDidAppear，最终需要这样做:)

- (void)viewDidAppear:(BOOL)animated
{
    [[(UITableView*)self.view delegate] delegatedViewDidAppear];
}

（这是一个一点的 hack，它让我不必跟踪类中的 DSD 对象。）

One of the reasons that it calls them a lot is that things can change dramatically each time there's a [... reloadData] or whatever, so it can't make any assumptions that things are as they were last time you called them. This is one of the reasons that they make a big deal out of caching UITableViewCells in the docs for example.

Here's a class demonstrating this:

@interface WinnersViewController : UITableViewController {
}
- (void)setDataSourceAndDelegate;
@end

in my viewDidLoad, I call a method called setDataSourceAndDelegate which sets one of three classes as the datasource and delegate properties on the table view.

- (void)viewDidLoad {
    [self setDataSourceAndDelegate];
    [super viewDidLoad];
}

I have three different objects that act as a DataSource and Delegate (combined) that I use, with an abstract class above them:

WinnersViewDefaultDSD
WinnersViewHasLocationDSD
WinnersViewHasExampleDSD

(I've replaced the actual class name in question with Example for obvious reasons.)

Now these classes return very different things to the table View, and sometimes when the state of my application changes (like having called CoreLocation or the User selecting an instance of class example, the setDataSourceAndDelegate method gets called again, and it can change which object it is on the fly.

So, the reason that UITableView calls so many things on its delegate and datasource so many times is because it needs to support developers doing this sort of thing with the table view. If certain methods were called once and then the answer was assumed unchanging, it wouldn't be as flexible.

Anyway, hope this is a helpful example.

(oh, and if anyone is going to emulate this, notice that the delegate and datasource properties on the TableView are copy and not retain so you have to do an extra retain on the instances of the DSD classes or you'll get a mysterious but frequent crash.)

(Also, I needed to override the viewDidAppear for the various DSD subclasses and ended up needing to do this:)

- (void)viewDidAppear:(BOOL)animated
{
    [[(UITableView*)self.view delegate] delegatedViewDidAppear];
}

(this is a bit of a hack that keeps me from having to track the DSD object in the class.)

回复 原文
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