ios - 将 PointF[] 转换为 CGPoint[]

Question

documentation 中的示例代码CGContext.AddLines 没有为我编译。

ctxt.AddLines (new PointF[] {
    new PointF (30, 30),
    new PointF (60, 30),
    new PointF (40, 40)
});

错误是

cannot convert from 'System.Drawing.PointF[]' to 'CoreGraphics.CGPoint[]'

我确实注意到这有效:

  public void AddStraightLine(PointF start, PointF end)
  {
     var path = new CGPath();

     path.AddLines(new CGPoint[]
     {
        start,
        end
     });
  }

Answer 1

文档有点过时，您必须将其切换为使用 CoreGraphics.CGPoint，这是最新且唯一的重载，而不是 System.Drawing.PointF .这是要求切换到 iOS 的结果 Unified API .

从文档移植的 iOS 的相应统一更改看起来像这样:

using (var ctxt = UIGraphics.GetCurrentContext())
{
    var startingPoint = new CGPoint(20, 20);
    ctxt.MoveTo(startingPoint.X, startingPoint.Y);
    ctxt.SetStrokeColor(UIColor.Red.CGColor);
    var sz = new CGSize(2, 2);
    Func<CGPoint, CGPoint> offset = (CGPoint pt) => new CGPoint(pt.X - 1, pt.Y - 1);
    ctxt.AddEllipseInRect(new CGRect(offset(startingPoint), sz));

    ctxt.AddLines(new CGPoint[]
    {
        new CGPoint (30, 30),
        new CGPoint (60, 30),
        new CGPoint (40, 40)
    });

    ctxt.StrokePath();
}