Is it possible to use AutoLayout with UITableView's tableHeaderView?

Question

Since I discovered AutoLayout I use it everywhere, now I\'m trying to use it with a tableHeaderView.

I made a subclass of

Answer 1

You can get autolayout to provide you with a size by using the systemLayoutSizeFittingSize method.

You can then use this to create the frame for your application. This technique works whenever you need to know the size of a view that uses autolayout internally.

The code in swift looks like

//Create the view
let tableHeaderView = CustomTableHeaderView()

//Set the content
tableHeaderView.textLabel.text = @"Hello world"

//Ask auto layout for the smallest size that fits my constraints    
let size = tableHeaderView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)

//Create a frame    
tableHeaderView.frame = CGRect(origin: CGPoint.zeroPoint, size: size)

//Set the view as the header    
self.tableView.tableHeaderView = self.tableHeaderView

Or in Objective-C

//Create the view
CustomTableHeaderView *header = [[CustomTableHeaderView alloc] initWithFrame:CGRectZero];

//Set the content
header.textLabel.text = @"Hello world";

//Ask auto layout for the smallest size that fits my constraints
CGSize size = [header systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];

//Create a frame
header.frame = CGRectMake(0,0,size.width,size.height);

//Set the view as the header  
self.tableView.tableHeaderView = header

It should also be noted that in this particular instance, overriding requiresConstraintBasedLayout in your subclass, does result in a layout pass being performed, however the results of this layout pass are ignored and the system frame set to the width of the tableView and 0 height.