The estimated height of rows in the table view.
- iOS 7.0+
- tvOS 9.0+
Providing a nonnegative estimate of the height of rows can improve the performance of loading the table view. If the table contains variable height rows, it might be expensive to calculate all their heights when the table loads. Using estimation allows you to defer some of the cost of geometry calculation from load time to scrolling time.
When you create a self-sizing table view cell, you need to set this property and use constraints to define the cell’s size.
The default value is
UITable, which means that the table view selects an estimated height to use on your behalf. Set the value to
0 to disable estimated heights.