为什么在使用自动布局时需要调用layoutIfNeeded

Question

I have custom UITableViewCell, inside the cell i have simple UIView , when i'm trying to get that View frame i got the 0 height and width.But when i call [self layoutIfNeeded] inside awakeFromNib method after it everything works fine. whats the problem ? why do i need every time call layoutIfNeeded to get correct frame size?

Answer 1

Since you are overriding awakeFromNib I assume you are using Interface Builder to lay out your cell. If so, the frame of the subviews are set up only after layoutSubviews is first called.