提取 UI 图像视图坐标

Question

我目前正在创建一个基于绘图的应用程序，我希望用户可以选择将坐标发送给另一个玩家。

我在 Xcode 8.1 中使用 swift3。

我能够提取图像的 PNG，但我想做的只是发送坐标以便在其他玩家屏幕上重新创建图像。

我已经将代码发布到用户的绘图功能中。我确实尝试推送 '上下文？ ' 在 'addLine' 之后放入一个数组，但没有任何看起来像坐标的东西被推入数组。

func drawPicture(fromPoint:CGPoint, toPoint:CGPoint) {
   UIGraphicsBeginImageContextWithOptions(self.drawPage.bounds.size,       false, 0.0)
   drawPage.image?.draw(in: CGRect(x: 0, y:0, width:self.drawPage.bounds.width, height:self.drawPage.bounds.height))
   let context = UIGraphicsGetCurrentContext()

   context?.move(to: CGPoint(x: fromPoint.x, y: fromPoint.y))
   context?.addLine(to: CGPoint(x: toPoint.x, y: toPoint.y))

   context?.setBlendMode(CGBlendMode.color)
   context?.setLineCap(CGLineCap.round)
   context?.setLineWidth(5)
   context?.setStrokeColor(UIColor(red: 0.26, green: 0.53, blue: 0.96, alpha: 1.0).cgColor)

   context?.strokePath()

   drawPage.image = UIGraphicsGetImageFromCurrentImageContext()
   UIGraphicsEndImageContext()

   }

感谢您的任何想法:)

Answer 1

我建议添加一个数组，您可以在其中添加坐标，然后在您需要的任何地方发送该数组的内容。例如。像这样：

struct DrawingCoordinate {
        var from: CGPoint
        var to: CGPoint
        init(from: CGPoint, to: CGPoint) {
            self.from = from
            self.to = to
        }
    }
    var coordinatesArray = [DrawingCoordinate]()

    func drawPicture(fromPoint:CGPoint, toPoint:CGPoint) {
        UIGraphicsBeginImageContextWithOptions(self.drawPage.bounds.size,       false, 0.0)
        drawPage.image?.draw(in: CGRect(x: 0, y:0, width:self.drawPage.bounds.width, height:self.drawPage.bounds.height))
        let context = UIGraphicsGetCurrentContext()

        context?.move(to: CGPoint(x: fromPoint.x, y: fromPoint.y))
        context?.addLine(to: CGPoint(x: toPoint.x, y: toPoint.y))

        // add this line to your array
        coordinatesArray.append(DrawingCoordinate(from: fromPoint, to: toPoint))

        context?.setBlendMode(CGBlendMode.color)
        context?.setLineCap(CGLineCap.round)
        context?.setLineWidth(5)
        context?.setStrokeColor(UIColor(red: 0.26, green: 0.53, blue: 0.96, alpha: 1.0).cgColor)

        context?.strokePath()

        drawPage.image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
    }

你觉得这有意义吗？

提取 UI 图像视图坐标

Extracting UI Image View coordinates

coordinates

ios

uigraphicscontext

swift

xcode8