xcode 多次调用 UITableView numberOfRowsInSection
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UITableView numberOfRowsInSection called multiple times
提问by Chris
How many times should the tableView:numberOfRowsInSectionmethod be called when populating a table view?
tableView:numberOfRowsInSection填充表视图时该方法应该调用多少次？
My application is crashing with no warnings, errors, or a stack trace. I have also tested for memory leaks and have found none. The app holds steady at about 1.4MB.
我的应用程序崩溃，没有警告、错误或堆栈跟踪。我还测试了内存泄漏，但没有发现。该应用程序保持稳定在 1.4MB 左右。
I have NSLog reporting as methods are messaged, and I notice that tableView:numberOfRowsInSectionis being called multiple times. The app crashes during one of these "extra" calls. The point at which the app crashes varies. I should point out that the table is populating about 600 cells, if that makes a difference.
当方法被发送消息时，我有 NSLog 报告，我注意到它tableView:numberOfRowsInSection被多次调用。该应用程序在这些“额外”调用之一期间崩溃。应用程序崩溃的点各不相同。我应该指出，如果这有所不同的话，该表将填充大约 600 个单元格。
I can post code if you want, but my data source comes from a singleton class, so It is a lot of code. Any help would be greatly appreciated.
如果你愿意，我可以发布代码，但我的数据源来自singleton class，所以代码很多。任何帮助将不胜感激。
回答by Andrei Stanescu
See my answer in another similar question: link
Basically, calls to the the delegate methods of a table view can be triggered by different events. It wouldn't be a suprise to me that UITableView calls numberOfRowsInSectionmultiple times (even for the same section).
请参阅我在另一个类似问题中的回答：link
基本上，对表视图的委托方法的调用可以由不同的事件触发。UITableViewnumberOfRowsInSection多次调用（即使是同一部分）对我来说并不奇怪。
回答by Omar
I faced the same problem, the first time tableview instance is not nil and the subsequent times it is nil. The problem was, I had yet not set the return value for
我遇到了同样的问题，第一次 tableview 实例不是 nil，随后它是 nil。问题是，我还没有设置返回值
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
and because of this it kept happening. Once I set a return value the problem was gone. Hope this helps someone.
正因为如此，它一直在发生。一旦我设置了返回值，问题就消失了。希望这可以帮助某人。
回答by V.V
the best way is to use Lazy table image loading. so that the 600 cells is a big amount and if you call all the data in a single time it will always going to be crashed due to memory issues.
最好的方法是使用Lazy table 图像加载。所以 600 个单元是一个很大的数量，如果你一次调用所有数据，它总是会因为内存问题而崩溃。
try using the code I provided .
尝试使用我提供的代码。
Another answer on the stackoverflow can help you out.
stackoverflow上的另一个答案 可以帮助您。
