Im currently making an app usig PencilKit and SwiftUI. If the screen is rotated, the canvas (and the drawing) should be rescaled acordingly. I do this with the Geometry reader and calculating the size.
NavigationView {
GeometryReader { g in
HStack {
CanvasView(canvasView: $canvasView)
.frame(width: g.size.width/1.5, height: (g.size.width/1.5)/1.5)
placeholder(placeholder: scaleDrawing(canvasHeight: (g.size.width/1.5)/1.5))
}
}
}
func scaleDrawing(canvasHeight : CGFloat) -> Bool {
let factor = canvasHeight / lastCanvasHeight
let transform = CGAffineTransform(scaleX: factor, y: factor)
canvasView.drawing = canvasView.drawing.transformed(using: transform)
lastCanvasHeight = canvasHeight
return true
}
The drawing however gets not scaled.
My solution was to create a placeholder view which has a boolean as a parameter. Also a method that scales the drawing with the height of the Canvas as an input.
This works but i think its pretty hacky and not the best solution, but this was the only solution that worked.
Is there a better way to do this? What am i missing?
