> For the complete documentation index, see [llms.txt](https://gitbook.existorlive.cn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook.existorlive.cn/ios/ui/uikit/uitableview/uitableview-de-jia-zai-guo-cheng.md).

# UITableView的加载过程

> `UITableView`有一个UITableViewDelegate对象和UITableViewDataSource对象，我们通过研究这两个对象的方法的调用过程来研究UITableView的加载过程

* **首次加载和调用reloadData**

> `UITableView`的首次加载，其实就是`UITableView`调用`reloadData`之后的结果。

1. 首先会调用`numberOfSectionsInTableView:`获取section的数量
2. 然后调用`tableView:numberOfRowsInSection:`获取section中row的数量
3. 接着加载cell视图，`tableView:cellForRowAtIndexPath:`获取cell，`tableView:heightForRowAtIndexPath:`获取cell的高度。（这里仅加载需要显示的cell）
4. 最后加载section的header view和 footer view。先获取高度，`tableView: heightForHeaderInSection:`,再获取视图,`tableView:viewForHeaderInSection:`

***

* **滑动UITableView**

> 滑动`UITableView`的过程其实就是将不可见的cell加载出来的过程。因此在这个过程中，仅会与cell和header view ，footer view加载的方法。`tableView:cellForRowAtIndexPath:tableView:heightForRowAtIndexPath:tableView: heightForHeaderInSection:tableView:viewForHeaderInSection:`

***

* **插入和删除cell**

>


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