Bright Future Bright Future - 10 months ago 51
iOS Question

View controller origin changes every time it's presented

This is what my view controller should be:

enter image description here

This is what it is sometimes:

enter image description here

I want to display a view controller in the circle, however, almost every time the view controller in the circle (

) is presented, it's place is different, though its properties doesn't change at all. Here's my code:

func openCircle(withCenter center: CGPoint, dataSource: ([Items], Int, String)){
self.addCircle(withCenter: center, dataSource: dataSource)

func addCircle(withCenter circleCenter: CGPoint, dataSource: ([Items], Int, String)) {

let longerSide = fmax(view.frame.size.height, view.frame.size.width)
let shorterSide = fmin(view.frame.size.height, view.frame.size.width)

let circleRadius = longerSide / 2
var resultViewOrigin = CGPoint()
var resultViewSize = CGSize()

if UIDevice.current.userInterfaceIdiom == .pad {

let rectWidth = shorterSide / 2
let rectHeight = sqrt(abs(circleRadius * circleRadius - rectWidth * rectWidth)) + view.frame.size.height - circleCenter.y
resultViewSize = CGSize(width: rectWidth, height: rectHeight)
resultViewOrigin = CGPoint(x: (view.frame.size.width - rectWidth) / 2, y: view.frame.size.height - rectHeight)

} else {
resultViewOrigin = CGPoint(x: 0.0, y: 0.0)
resultViewSize = CGSize(width: view.frame.size.width, height: view.frame.size.height)

let resultViewController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "ResultVC") as! ResultViewController
resultViewController.transitioningDelegate = self
resultViewController.modalPresentationStyle = .custom
resultViewController.dataSource = dataSource
resultViewController.view.frame = CGRect(origin: resultViewOrigin, size: resultViewSize) = UIView()
transition.startingPoint = circleCenter
transition.radius = circleRadius = circleFrame(radius: transition.radius, center: transition.startingPoint)

present(resultViewController, animated: true)

It works well on the iPhone, not on the iPad, what's the problem?

Answer Source

I found the problem, it's actually a missing constraint on Regular-Regular size class caused this problem, I fixed it by adding a spacing to bottom layout guide to the part that used to get misplaced.

Thanks to everybody for your idea.