UIBezierPath / Shape 有奇怪的定位和大小调整行为

如何解决UIBezierPath / Shape 有奇怪的定位和大小调整行为

我正在尝试将一些 SVG 数据（一些中文字符的形状）转换为 UIBezierPath。每个字符由多个 UIBezierPath 组成。这是一个 UIBezierPath 的示例：

var mypath: UIBezierPath {
    let bp = UIBezierPath()
    bp.move(to: CGPoint(x: 147,y: 32))
    bp.addQuadCurve(to: CGPoint(x: 203,y: 102),controlPoint: CGPoint(x: 181,y: 74))
    bp.addQuadCurve(to: CGPoint(x: 271,y: 189),controlPoint: CGPoint(x: 242,y: 166))
    bp.addQuadCurve(to: CGPoint(x: 274,y: 217),controlPoint: CGPoint(x: 287,y: 204))
    bp.addQuadCurve(to: CGPoint(x: 229,y: 235),controlPoint: CGPoint(x: 258,y: 229))
    bp.addQuadCurve(to: CGPoint(x: 193,controlPoint: CGPoint(x: 204,y: 241))
    bp.addQuadCurve(to: CGPoint(x: 190,y: 219),controlPoint: CGPoint(x: 183,y: 231))
    bp.addQuadCurve(to: CGPoint(x: 143,y: 71),controlPoint: CGPoint(x: 199,y: 195))
    bp.addQuadCurve(to: CGPoint(x: 125,y: 33),controlPoint: CGPoint(x: 134,y: 55))
    bp.addCurve(to: CGPoint(x: 147,y: 32),controlPoint1: CGPoint(x: 113,y: 5),controlPoint2: CGPoint(x: 128,y: 9))
    bp.close()
    return bp
}

由于我的最终结果由多个 UIBezierPaths 组成，因此我正在尝试缩放它们：

extension UIBezierPath {
    static func calculateBounds(paths: [UIBezierPath]) -> CGRect {
        let myPaths = UIBezierPath()
        for path in paths {
            myPaths.append(path)
        }
        return (myPaths.bounds)
    }
}

struct ShapeView: Shape {
    let bezier: UIBezierPath
    let pathBounds: CGRect

    func path(in rect: CGRect) -> Path {
        let pointScale = (rect.width >= rect.height) ?
            max(pathBounds.height,pathBounds.width) :
            min(pathBounds.height,pathBounds.width)

        let pointTransform = CGAffineTransform(scaleX: 1/pointScale,y: 1/pointScale)
        let path = Path(bezier.cgPath).applying(pointTransform)

        let multiplier = min(rect.width,rect.height)
        let transform = CGAffineTransform(scaleX: multiplier,y: multiplier)
        return path.applying(transform)
        }
    }

查看：

struct Drawer: View {

    let pathBounds = UIBezierPath.calculateBounds(paths: [mypath]) // to simplify I just add only one shape. Usually there are multiple

    var body: some View {
        ZStack{
            ShapeView(bezier: mypath,pathBounds: pathBounds) 
                .background(Color.red)
            }
        }
    }

这是显示的结果：

如您所见：形状未居中且比屏幕大。我做错了什么，我如何才能使形状居中并完美地适合整个屏幕？

解决方法

我不确定路径转换逻辑是什么（即使你需要它，缺陷就在那里），但只是应用像

    {
        "message": "Method not allowed"
    }

给出这个（可能是你所期望的）：