How to create custom view programmatically in swift having controls text field, button etc

The CGRectZero constant is equal to a rectangle at position (0,0) with zero width and height. This is fine to use, and actually preferred, if you use AutoLayout, since AutoLayout will then properly place the view.

But, I expect you do not use AutoLayout. So the most simple solution is to specify the size of the custom view by providing a frame explicitly:

customView = MyCustomView(frame: CGRect(x: 0, y: 0, width: 200, height: 50))self.view.addSubview(customView)

Note that you also need to use addSubview otherwise your view is not added to the view hierarchy.

Swift 3 / Swift 4 Update:

let screenSize: CGRect = UIScreen.main.boundslet myView = UIView(frame: CGRect(x: 0, y: 0, width: screenSize.width - 10, height: 10))self.view.addSubview(myView)

var customView = UIView()@IBAction func drawView(_ sender: AnyObject) {    customView.frame = CGRect.init(x: 0, y: 0, width: 100, height: 200)    customView.backgroundColor = UIColor.black     //give color to the view     customView.center = self.view.center      self.view.addSubview(customView)       }