The estimated height of section footers in the table view.
- iOS 7.0+
- tvOS 9.0+
Providing a nonnegative estimate of the height of section footers can improve the performance of loading the table view. If the table contains variable height section footers, 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.
The default value is
automatic, which means that the table view selects an estimated height to use on your behalf. Setting the value to
0 disables estimated heights, which causes the table view to request the actual height for each footer. If your table uses self-sizing footers, the value of this property must not be