Cellforrowatindexpath method not to perform those pits

Today, UITableView is used in the form of xib. However, the Cellforrowatindexpath method is not executed, check the number of returned row, the number of sections, data source, the agent is not a problem, but Cellforrowatindexpath still alive or dead do not do, View View TableView is still not visible. Almost to crash ....

The final discovery is that there is a constraint problem, and I set the TableView constraint to be the same height as its parent view. I guess this may be related to the TableView loading process, it detects that the height of the TableView is 0, and does not request the cell directly from the data source object.

WORKAROUND: Set the length-to-width ratio of the tableview without determining the height through the parent view.

Cellforrowatindexpath method not to perform those pits