Change UILabel.frame when orientation changes using viewWillTransition - ios

Question

I programmatically create a set of buttons in the viewDidLoad() of my UIInputViewController. I am trying to change the size of these buttons when the orientation changes from landscape to portrait and vice-versa.
I am trying to do this by using
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)
but when I go through the same code I used to create my buttons in viewDidLoad() with only the UIlabel.frame change to accommodate the new height and width, the view is not updated. Do I have to first remove the buttons and load them from scratch or is there another method to do this?
Below is the full code from the function.
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
let width = screensize.width
var height = CGFloat(141)
let sizey = screensize.height
switch sizey {
case 1366:
height = CGFloat(383-15)
case 1112:
height = CGFloat(320-15)
case 812:
height = CGFloat(141-15)
case 1024:
height = CGFloat(320-15)
case 736:
height = CGFloat(226-15)
case 667:
height = CGFloat(216-15)
case 568:
height = CGFloat(216-15)
case 768:
height = CGFloat(420-15)
default:
height = CGFloat(141-15)
}
connection.frame = CGRect(x: 0, y: 0, width: width/2, height: 15)
serialNum.frame = CGRect( x: width/2, y: 0, width: width/2, height:15)
plus.frame = CGRect(x:0, y: 15, width: width/5,height: height/4)
minus.frame = CGRect(x:0, y: height/4+15, width: width/5,height: height/4)
left.frame = CGRect(x:0, y: height/2+15, width: width/5,height: height/4)
nextKeyboardButton.frame = CGRect(x:0,y: 3*height/4+15, width: width/5,height: height/4)
num1.frame = CGRect(x:width/5, y: 15, width: width/5,height: height/4)
num4.frame = CGRect(x:width/5, y: height/4+15, width: width/5,height: height/4)
num7.frame = CGRect(x:width/5, y: height/2+15, width: width/5,height: height/4)
comma.frame = CGRect(x:width/5, y: 3*height/4+15, width: width/5,height: height/4)
num2.frame = CGRect(x:width*2/5,y: 15, width: width/5,height: height/4)
num5.frame = CGRect(x:width*2/5,y: height/4+15, width: width/5,height: height/4)
num8.frame = CGRect(x:width*2/5,y: height/2+15, width: width/5,height: height/4)
num0.frame = CGRect(x:width*2/5,y: 3*height/4+15, width: width/5,height: height/4)
num3.frame = CGRect(x:width*3/5,y: 15, width: width/5,height: height/4)
num6.frame = CGRect(x:width*3/5,y: height/4+15, width: width/5,height: height/4)
num9.frame = CGRect(x:width*3/5,y: height/2+15, width: width/5,height: height/4)
period.frame = CGRect(x:width*3/5,y: 3*height/4+15, width: width/5,height: height/4)
back.frame = CGRect(x:width*4/5, y: 15, width: width/5, height: height/4)
spaceBar.frame = CGRect(x: width*4/5, y: height/4+15, width: width/5, height: height/4)
right.frame =
CGRect(x: width*4/5, y: height/2+15, width: width/5, height: height/4)
returnKey.frame = CGRect(x:width*4/5, y: height*3/4+15, width: width/5, height: height/4)
self.view.addSubview(spaceBar)
self.view.addSubview(num1)
self.view.addSubview(num2)
self.view.addSubview(num3)
self.view.addSubview(num4)
self.view.addSubview(num5)
self.view.addSubview(num6)
self.view.addSubview(num7)
self.view.addSubview(num8)
self.view.addSubview(num9)
self.view.addSubview(num0)
self.view.addSubview(plus)
self.view.addSubview(minus)
self.view.addSubview(back)
self.view.addSubview(left)
self.view.addSubview(right)
self.view.addSubview(period)
self.view.addSubview(comma)
self.view.addSubview(nextKeyboardButton)
self.view.addSubview(returnKey)

Answer 1

You need to use the ‘size’ argument that you get in the ‘viewWillTransition’ method to set the new ‘width’ and ‘sizey’ properties in stead of ‘screensize’.

Answer 2

You shouldn't call addSubview on orientation change if you've already added the buttons in viewDidLoad. Updating the frame should be enough.

Answer 3

Since you have added these set of buttons in the viewDidLoad() of your UIInputViewController, you don't need to use addSubview in viewWillTransition to size method.
Even after rotating the device still you are using the old screen size.
Change
let width = screensize.width
let sizey = screensize.height
To
let width = UIScreen.main.bounds.width
let sizey = UIScreen.main.bounds.height
Or
let width = size.width
let sizey = size.height