How to add a Container View programmatically

Question

A Container View can be easily added into a storyboard through Interface Editor. When added, a Container View is of a placeholder view, an embed segue, and a (child) view co

Answer 1

Here is my code in swift 5.

class ViewEmbedder {
class func embed(
    parent:UIViewController,
    container:UIView,
    child:UIViewController,
    previous:UIViewController?){

    if let previous = previous {
        removeFromParent(vc: previous)
    }
    child.willMove(toParent: parent)
    parent.addChild(child)
    container.addSubview(child.view)
    child.didMove(toParent: parent)
    let w = container.frame.size.width;
    let h = container.frame.size.height;
    child.view.frame = CGRect(x: 0, y: 0, width: w, height: h)
}

class func removeFromParent(vc:UIViewController){
    vc.willMove(toParent: nil)
    vc.view.removeFromSuperview()
    vc.removeFromParent()
}

class func embed(withIdentifier id:String, parent:UIViewController, container:UIView, completion:((UIViewController)->Void)? = nil){
    let vc = parent.storyboard!.instantiateViewController(withIdentifier: id)
    embed(
        parent: parent,
        container: container,
        child: vc,
        previous: parent.children.first
    )
    completion?(vc)
}

}

Usage

@IBOutlet weak var container:UIView!

ViewEmbedder.embed(
    withIdentifier: "MyVC", // Storyboard ID
    parent: self,
    container: self.container){ vc in
    // do things when embed complete
}

Use the other embed function with non-storyboard view controller.