Set Constraints Programatically Of An XIB File in Swift

Question

How to Attach XIB File at the buttom of Super view

I Have an XIB File Named "xibFIleView"

My code for calling XIB View is:-

 override func viewDidLoad() {
        super.viewDidLoad()

       self.view.addSubview(instanceFromNib())
    }

    func instanceFromNib() -> xibFIleView {

        return UINib(nibName: "xibFileView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! xibFIleView
    }
}

When I run My project my Simulator shows:-

How Can We Attach XIB view at the Bottom of the super view.

Did you try solution that I posted?

Bhaumik
– Bhaumik

2019-03-15 19:03:19 +00:00
Commented Mar 15, 2019 at 19:03 — Bhaumik
– Bhaumik, Commented Mar 15, 2019 at 19:03
yes it works for me thanks @Bhaumik

piyush ranjan
– piyush ranjan

2019-03-16 11:20:23 +00:00
Commented Mar 16, 2019 at 11:20 — piyush ranjan
– piyush ranjan, Commented Mar 16, 2019 at 11:20

Bhaumik · Accepted Answer · 2019-03-14 15:31:11Z

You can achieve this by setting constraints or frame to your xibView.

Set Constraints:

override func viewDidLoad() {
    super.viewDidLoad()

    let xibView = instanceFromNib()
    self.view.addSubview(xibView)
    xibView.translatesAutoresizingMaskIntoConstraints = false
    let constraint_leading = NSLayoutConstraint(item: xibView, attribute: .leading, relatedBy: .equal, toItem: self.view, attribute: .leading, multiplier: 1, constant: 0)
    let constraint_bottom = NSLayoutConstraint(item: xibView, attribute: .bottom, relatedBy: .equal, toItem: self.view, attribute: .bottom, multiplier: 1, constant: 0)
    let constraint_height = NSLayoutConstraint(item: xibView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1, constant: xibView.frame.height)
    let constraint_width = NSLayoutConstraint(item: xibView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .width, multiplier: 1, constant: xibView.frame.width)
    self.view.addConstraint(constraint_leading)
    self.view.addConstraint(constraint_bottom)
    xibView.addConstraint(constraint_height)
    xibView.addConstraint(constraint_width)
}

----- or -----

Set frame:

Make following changes in your viewDidLoad():

override func viewDidLoad() {
    super.viewDidLoad()

    let xibView = instanceFromNib()
    let y_pos = self.view.frame.height - xibView.frame.height
    xibView.frame = CGRect(x: 0, y: y_pos, width: xibView.frame.width, height: xibView.frame.height)
    // change x, y, width, height based on your requirement.
    self.view.addSubview(xibView)
}

Note: change x, y position and width, height based on your requirement.

Josh Homann · Accepted Answer · 2019-03-14 15:23:34Z

Use auto layout to add 4 constraints sufficient to specify the subviews width, height, x and y position. For example:

override func viewDidLoad() {
    super.viewDidLoad()

    let child = instanceFromNib()
    self.view.addSubview(child)
    NSLayoutConstraint.activate([
        child.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        child.leadingAnchor.constraint(equalTo: view.leadingAnchor),
        child.trailingAnchor.constraint(equalTo: view.trailingAnchor),
        child.heightAnchor.constraint(equalToConstant: 300) // <- Your desired view height here
    )]
}

func instanceFromNib() -> xibFIleView {

    return UINib(nibName: "xibFileView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! xibFIleView
}

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