Swift +hide or remove a UIView

Question

I have UITableViewController , on top of it I placed an UIView and inside it there is a UICollectionView .

When collectionView data is empty I want to remove the UIView . I tried:

self.collectionView.removeFromSuperview() 

and

self.collectionView.hidden = true

These removes the UIView but there is an empty space above my tableview . How can I get rid of it?

Edit: added a photo of my storyboard. Recommended View is not inside the tableviewheader.

Answer 1

我没有尝试过，但是这段代码应该可以解决您的问题。

self.tableView.tableHeaderView?.isHidden = true

Answer 2

You have placed Recommended View inside the table view - not on top of it. So you could have placed it as header or cell. So when you don't want it to be present, change cell pr header height.

Answer 3

It looks like the collection view is a table header view (the way you have positioned it in the storyboard).

Try setting it to nil if data is empty

self.tableView.tableHeaderView = nil

Answer 4

The RecommendedView is a tableHeaderView . Try to have a outlet to the height constraint of the RecommendedView.

Set the height constraint to 0 in case you don't have any element in the collection view.

@IBOutlet var tableHeaderHeighConstraint: NSLayoutConstraint!

override func viewDidLoad(){
    if collectionIsEmpty(){
        tableHeaderHeighConstraint.constant = 0
        self.tableView.tableHeaderView?.layoutIfNeeded()
    }
}