为什么是"tableview.cellForRowAtIndexPath(indexPath)"?给我一个BAD_ACCESS错误? [英] Why "tableview.cellForRowAtIndexPath(indexPath)" give me a BAD_ACCESS error?

问题描述

我尝试使用此方法来获取该indexPath的单元格，但出现了此"EXC_BAD_ACCESS"错误. 但是，如果我使用self.tableView(tableView, cellForRowAtIndexPath:indexPath)，它可以正常工作.

I attempted to use this method to get the cell of that indexPath, but I got this "EXC_BAD_ACCESS" error. But if I use self.tableView(tableView, cellForRowAtIndexPath:indexPath), it works fine.

我很困惑这两种方法有什么区别?

I am confused what's the difference between that two methods?

推荐答案

使用self.tableView(tableView, cellForRowAtIndexPath:indexPath)是您的View Controller的代码，并且出队是一个合适的新单元格.而如果单元格不可见，则表视图上的cellForRowAtIndexPath方法将返回nil.由于heightForRowAtIndexPath试图找出可见的行，因此不起作用并不奇怪.

Using self.tableView(tableView, cellForRowAtIndexPath:indexPath) is the code is your View Controller, and it dequeue's a suitable new cell. Whereas, the cellForRowAtIndexPath method on the table view returns nil if the cell is not visible. Since heightForRowAtIndexPath is trying to work out which rows are visible, it's not surprising that it doesn't work.

> SO答案表明在heightForRowAtIndexPath中调用cellForRowAtIndexPath递归调用自己.这就是为什么您会收到错误消息.

This SO answer shows that calling cellForRowAtIndexPath within heightForRowAtIndexPath recursively calls itself. Which is why you're getting the error.

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