A native port of the UIImage categories by Apple from WWDC 2013.
UIImage image = UIImage.FromFile ("cheetah.png")
image = image.ApplyDarkEffect ();Getting the iOS7 style blur is a bit more tricky but can be achieved with the following code.
// Helper method to create an image snapshot of a view
UIImage SnapshotImageWithScale (UIView view, float scale)
{
UIGraphics.BeginImageContextWithOptions (view.Bounds.Size, false, scale);
view.DrawViewHierarchy (view.Bounds, true);
UIImage image = UIGraphics.GetImageFromCurrentImageContext ();
UIGraphics.EndImageContext ();
return image;
}
...
// Create snapshot of the parent view (this can be the superview or anything else)
UIImage snapshot = SnapshotImageWithScale (parentView, UIScreen.MainScreen.Scale);
// Blur the snapshot with the specified radius and tint color
snapshot = snapshot.ApplyBlur (6.0f, UIColor.FromWhiteAlpha (0.0f, 0.6f), 0.8f, null);
// Create an UIImageView to display the blurred snapshot
UIImageView snapshotView = new UIImageView {
Frame = new RectangleF (0, 0, View.Bounds.Width, View.Bounds.Height),
Image = snapshot,
};
View.AddSubview (snapshotView);Either drop in src/UIImageExtensions.cs to your project or build a standalone library and reference it.
MonoTouch.UIImageEffects is tested on iOS7, but may be compatible with lower versions.
Lukas Lipka
MonoTouch.UIImageEffects is available under the MIT license. See the LICENSE file for more info.