cellForRowAtIndexPath 在 viewWillAppear iPhone SDK 3.2 plus 之前调用
升级我的 SDK 版本后，我注意到 cellForRowAtIndexPath 总是在 viewWillAppear 之前调用。以前的执行顺序是相反的：viewWillAppear 总是在 cellForRowAtIndexPath 之前调用。由于我的应用程序逻辑经常使用 viewWillAppear 来初始化随后在 cellForRowAtIndexPath 中使用的对象，因此应用程序经常崩溃。
我尝试寻找有关此更改的官方补偿，但没有成功。我可能可以将初始化代码移至 viewDidLoad，但想看看是否有更好的解决方案或有关此行为更改的更多信息。
After upgrading my SDK version I noticed that cellForRowAtIndexPath is always called prior to viewWillAppear. Previously the order of execution was opposite: viewWillAppear would always be called prior to cellForRowAtIndexPath. Because my application logic often used viewWillAppear to initialize objects that are subsequently used in cellForRowAtIndexPath, the application is often crashing.
I tried searching for an official expiation regarding this change with no success. I can likely move my initialization code to viewDidLoad, but wanted to see if there are better solutions or more information about this change in behavior.
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添加一行即可解决您的问题
您只需在 viewWillAppear 末尾
You can just add the line
at the end of viewWillAppear and your problem will be fix
它不是“在
viewWillAppear之前调用cellForRowAtIndexPath”，而是[super viewWillAppear:animated]会调用UITableView的委托。我犯了同样的错误，我花了很多时间才找到它。
It is not "
cellForRowAtIndexPathcalled beforeviewWillAppear", it is[super viewWillAppear:animated]will call UITableView's delegate.I made the same mistake and it took me a lot of time to find it.