swift - Xamarin 中的 CGMutablePath

Question

我正在尝试为我的 Xamarin.iOS 应用翻译这段代码:

https://github.com/yourtion/YXWaveView/blob/master/YXWaveView/YXWaveView.swift

第 179 行:

let path = CGMutablePath()

我在 Xamarin 中找不到 CGMutablePath？

Answer 1

ObjC CGMutablePathRef 结构(或 Swift CGMutablePath 类)被 Xamarin.iOS 包装为 CGPath(CoreGraphics命名空间)。

var path = new CGPath();

xamarin-macios/src/CoreGraphics/CGPath.cs

public class CGPath : INativeObject, IDisposable {
        internal IntPtr handle;

        [DllImport (Constants.CoreGraphicsLibrary)]
        extern static /* CGMutablePathRef */ IntPtr CGPathCreateMutable ();

        public CGPath ()
        {
            handle = CGPathCreateMutable ();
        }

        [Mac(10,7)][iOS (5,0)]
        public CGPath (CGPath reference, CGAffineTransform transform)
        {
            if (reference == null)
                throw new ArgumentNullException ("reference");
            handle = CGPathCreateMutableCopyByTransformingPath (reference.Handle, ref transform);
        }

        [DllImport (Constants.CoreGraphicsLibrary)]
        extern static /* CGMutablePathRef */ IntPtr CGPathCreateMutableCopy (/* CGPathRef */ IntPtr path);

        public CGPath (CGPath basePath)
        {
            if (basePath == null)
                throw new ArgumentNullException ("basePath");
            handle = CGPathCreateMutableCopy (basePath.handle);
        }
 ~~~~~