public static BorderGrandientConfig Create(UIColor[] color,
Orientation orientation)
{
var border = new BorderGrandientConfig
{
StartColor = color.FirstOrDefault()?.CGColor,
EndColor = color.LastOrDefault()?.CGColor
};
switch (orientation)
{
case Orientation.Vertical:
border.StartPoint = new CGPoint(0f, 0.0f);
border.EndPoint = new CGPoint(1.0f, 1.0f);
break;
case Orientation.Horizontal:
border.StartPoint = new CGPoint(0f, 0.5f);
border.EndPoint = new CGPoint(1.0f, 0.5f);
break;
default:
throw new ArgumentOutOfRangeException(nameof(orientation), orientation, null);
}
return(border);
}
public static void AddGradientBorder(this UIView view, BorderGrandientConfig config)
{
view.Layer.MasksToBounds = true;
view.Layer.BorderWidth = 0f;
var grandientLayer = new CAGradientLayer();
var bounds = new CGRect(CGPoint.Empty, view.Frame.Size);
grandientLayer.Frame = bounds;
grandientLayer.StartPoint = config.StartPoint;
grandientLayer.EndPoint = config.EndPoint;
grandientLayer.Colors = new[] { config.StartColor, config.EndColor };
var shapeLayer = new CAShapeLayer
{
LineWidth = config.BorderWidth,
FillColor = null,
StrokeColor = UIColor.Black.CGColor,
Path = UIBezierPath.FromRoundedRect(bounds,
view.Layer.CornerRadius).CGPath
};
grandientLayer.Mask = shapeLayer;
view.Layer.AddSublayer(grandientLayer);
}