Xamarin iOS Api Differences

Some useful code snippets comparing api's in swift and c#

Posted on January 08, 2022 Categories: ios c# swift

Useful Api Differences In Xamarin iOS

When working with the iOS api in Xamarin iOS you will sometimes encounter swift api’s that have been renamed or moved in Xamarin. Whilst I was recently converting a swift app to c# I encountered some interesting changes that I thought might be useful to share.


//Covered in this blog

CGRect Origin

// See this

let frame = CGRect(100, 340, 100, 100)

let originX = frame.origin.x
var originX = frame.Location.X;

CALayer layerRectConverted

Converts a rectangle in the coordinate system used for metadata outputs to one in the preview layer’s coordinate system.


let myLayer = CALayer()
let metadataRect = CGRect(x: 0, y: 0, width: 1, height: 1)

let mappedRect = myLayer.layerRectConverted(fromMetadataOutputRect: metadataRect)


In Xamarin this api is called MapToLayerCoordinates:

CALayer myLayer = new CALayer();
CGRect metadataRect new CGRect(0, 0, 1, 1);;

CGRect mappedRect = myLayer.MapToLayerCoordinates(metadataRect);