ios – 每次显示控制器原点时都会发生变化

这有时是这样的：

我想在圆圈中显示一个视图控制器,但是,几乎每次呈现圆圈中的视图控制器(ResultViewController)时,它的位置都不同,尽管它的属性根本不会改变.这是我的代码：

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

func addCircle(withCenter circleCenter: CGPoint,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.userInterfaceI@L_550_6@m == .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)

    transition.circle = UIView()
    transition.starTingPoint = circleCenter
    transition.radius = circleRadius
    transition.circle.frame = circleFrame(radius: transition.radius,center: transition.starTingPoint)

    present(resultViewController,animated: truE)
}

它在iPhone上运行良好,而不是在iPad上运行,问题是什么？