Question

是否有人能够帮助我将此方法在ios中转换为mac版本？代码是用Xamarin中的C＃编写的

public static UIImage GetImageFromColor(UIColor color, float borderWidth = 1.0f)
    {
        var rect = new CGRect(0.0f, 0.0f, borderWidth, borderWidth);
        UIGraphics.BeginImageContext(rect.Size);
        var context = UIGraphics.GetCurrentContext();
        context.SetFillColor(color.CGColor);
        context.FillRect(rect);

        var image = UIGraphics.GetImageFromCurrentImageContext();
        UIGraphics.EndImageContext();

        return image.CreateResizableImage(new UIEdgeInsets(1.0f, 1.0f, 1.0f, 1.0f));
    }

Answer 1

UIGraphics.BeginImageContext会转换为CGBitmapContext（或CGContext，具体取决于您的需求。

所以要填充CGBitmapContext颜色：

var size = new CGSize(width, height);
var rect = new CGRect(new CGPoint(), size);

NSImage image;
using (var context = new CGBitmapContext(IntPtr.Zero, width, height, 8, width * 4, NSColorSpace.GenericRGBColorSpace.ColorSpace, CGImageAlphaInfo.PremultipliedFirst))
{
    context.SetFillColor(NSColor.Red.CGColor);
    context.FillRect(rect);
    using (var cgImage = context.ToImage())
    {
        image = new NSImage(cgImage, size);
    }
}

注意：您应该使用using或确保您Dispose的上下文和CGImage以避免内存泄漏

Answer 2

这不是您发布的代码的翻译，但它的工作完全相同：

public static NSImage GetImageFromColor (NSColor color, float borderWidth = 1.0f)
{
    var image = new NSImage (new CGSize (borderWidth, borderWidth));
    image.LockFocus ();
    color.DrawSwatchInRect (new CGRect (new CGPoint (0, 0), image.Size));
    image.UnlockFocus ();

    return image;
}

希望这会有所帮助.-

将CGContext生成图像方法从ios转换为mac

2 个答案: