Programmatic Autolayout changes inside UITableViewCell updated only after orientation change

Question

I have a UITableView with automatic row heights and a custom UITableViewCell . Inside the UITableViewCell , I first add some UIButton s with programmatic Autolayout constraints. They are positioned perfectly as I want. Then, after 3 seconds ( NSTimer ), I remove all those UIButton s and re-add a different number of them again. (For eg initially I have 4 UIButtons , after 3 seconds, I remove those 4 UIButton s and add 3 different ones.

Initially :

After 3 seconds :

Post rotate:

Why is this happening? I don't see any Autolayout warnings. Also, after an orientation change, everything is correctly positioned. What is it that requires an orientation change? How can I force this manually?(reloading the tableview just for this seems too much to do)

PS: I tried using setNeedsUpdateConstraints , layoutIfNeeded , layoutSubviews but to no avail.

Here's the UITableViewCell code: http://pastebin.com/TcHUXgDU . (Added a pastebin to not pollute this space) But basically, there's a configure: method that I have inside my tableview subclass which I call in the cellForRowAtIndexPath of its containing UITableView . This method adds those constraints. Also, after the timer fires, the same code is called (in another function) except that the number of items I add are different from the initial number of items.

This is my UITableViewCell layout: (Only top,bottom,leading,trailing constraints have been added to the UIView "Outerview")

Answer 1

您需要重新加载UITableView，这将重新计算单元格的高度