Vfrdtyky

I am working with Xamarin.iOS and now I want to rotate the image 90 degrees in ImageView when I click button.I found a similar issue.But it wrote in OC and Swift.How to implement it in C#?I couldn't find method such as CGAffineTransformMakeRotation.

Try to refer the following code

public UIImage RotateImage(UIImage image, float degree)

{

  float Radians = degree * (float)Math.PI / 180;



  UIView view = new UIView(frame: new CGRect(0, 0, image.Size.Width, image.Size.Height));

  CGAffineTransform t = CGAffineTransform.MakeRotation(Radians);

  view.Transform = t;

  CGSize size = view.Frame.Size;



  UIGraphics.BeginImageContext(size);

  CGContext context = UIGraphics.GetCurrentContext();



  context.TranslateCTM(size.Width/2, size.Height/2);

  context.RotateCTM(Radians);

  context.ScaleCTM(1, -1);



  context.DrawImage(new CGRect(-image.Size.Width/2, -image.Size.Height/2, image.Size.Width, image.Size.Height), image.CGImage);



  UIImage imageCopy = UIGraphics.GetImageFromCurrentImageContext();

  UIGraphics.EndImageContext();



  return imageCopy;

}

Then you can reset the image of UIImageView.
Here is a similar issue you can refer .

in Xamarin it's CGAffineTransform.MakeRotation

using CoreGraphics;



// 1.5708 is 90 degrees in Radians

myImageView.Transform = CGAffineTransform.MakeRotation(1.5708f);