Ios 无法获取CAShapeLayer的正确中心

有人能指出我做错了什么吗？我需要适应所有的iphone屏幕。这是一个好方法吗

var progressCircle = CAShapeLayer()

    let centerPoint = CGPoint (x: vu_SubmissionViewWithImageInCenter.bounds.width / 2, y: imgVu_Submission.bounds.width / 2)
    let circleRadius : CGFloat = vu_SubmissionViewWithImageInCenter.bounds.width / 2 * 0.94

    let circlePath = UIBezierPath(arcCenter: centerPoint, radius: circleRadius, startAngle: CGFloat(-0.5 * M_PI), endAngle: CGFloat(1.5 * M_PI), clockwise: true    )

    progressCircle = CAShapeLayer ()
    progressCircle.path = circlePath.cgPath
    progressCircle.strokeColor = UIColor.fuschia.cgColor
    progressCircle.fillColor = UIColor.clear.cgColor
    progressCircle.lineWidth = 3.5
    progressCircle.strokeStart = 0
    progressCircle.strokeEnd = 1.0
    vu_SubmissionViewWithImageInCenter.layer.addSublayer(progressCircle)


    let animation = CABasicAnimation(keyPath: "strokeEnd")
    animation.fromValue = 0
    animation.toValue = 1.0
    animation.duration = 5.0
    animation.fillMode = kCAFillModeForwards
    animation.isRemovedOnCompletion = false
    progressCircle.add(animation, forKey: "ani")
    animation.delegate = self

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您的半径计算错误。计算从弧中心到imageview边的距离，并将其用作半径

您的问题中包含代码的方法是什么？@robmayoff ViewWillLayoutSubview是视图控制器视图的子视图。在IB中，我检查了两次。您是否考虑过方法名称

viewWillLayoutSubviews

与方法

viewDidLayoutSubviews

相比意味着什么？问题不在于半径，而在于绘图中心