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

Question

I am trying to access the MyCustomView from another class using the following code in ViewController.swift ..
var view = MyCustomView(frame: CGRectZero)
.. in the viewDidLoad method. The problem is the view does not get initialized in the simulator.
I have already set class in storyboard for the current ViewController.
class MyCustomView: UIView {
var label: UILabel = UILabel()
var myNames = ["dipen","laxu","anis","aakash","santosh","raaa","ggdds","house"]
override init(){
super.init()
}
override init(frame: CGRect) {
super.init(frame: frame)
self.addCustomView()
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func addCustomView() {
label.frame = CGRectMake(50, 10, 200, 100)
label.backgroundColor=UIColor.whiteColor()
label.textAlignment = NSTextAlignment.Center
label.text = "test label"
label.hidden=true
self.addSubview(label)
var btn: UIButton = UIButton()
btn.frame=CGRectMake(50, 120, 200, 100)
btn.backgroundColor=UIColor.redColor()
btn.setTitle("button", forState: UIControlState.Normal)
btn.addTarget(self, action: "changeLabel", forControlEvents: UIControlEvents.TouchUpInside)
self.addSubview(btn)
var txtField : UITextField = UITextField()
txtField.frame = CGRectMake(50, 250, 100,50)
txtField.backgroundColor = UIColor.grayColor()
self.addSubview(txtField)
}

Answer 1

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.

Answer 2

Swift 3 / Swift 4 Update:
let screenSize: CGRect = UIScreen.main.bounds
let myView = UIView(frame: CGRect(x: 0, y: 0, width: screenSize.width - 10, height: 10))
self.view.addSubview(myView)

Answer 3

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)
}

Answer 4

let viewDemo = UIView()
viewDemo.frame = CGRect(x: 50, y: 50, width: 50, height: 50)
self.view.addSubview(viewDemo)

Answer 5

view = MyCustomView(frame: CGRectZero)
In this line you are trying to set empty rect for your custom view. That's why you cant see your view in simulator.