Custom View ios

SampleView.swift

import UIKit
@IBDesignable //desinagble in storyboard(view in storyboard)
class SampleView: UIView {
    
    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */
   
    
    override func awakeFromNib() { // user awake from nib instead of init with frame or coder
        super.awakeFromNib()
        nibSetup()
    }

    
    func loadViewFromNib() -> UIView? {

        let bundle = Bundle(for: type(of: self))
        let nib = UINib(nibName: "SampleView", bundle: bundle)
        return nib.instantiate(
            withOwner: self,
            options: nil).first as? UIView
    }
    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        nibSetup()
        
    }
    
    
    func nibSetup() {
        guard let contentView = loadViewFromNib() else { return }
        contentView.frame = bounds
        contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        self.addSubview(contentView)
        contentView.prepareForInterfaceBuilder()
    }
}

SampleView.xib.png