问题描述
Xamarin Forms Mac在纵横比填充方面存在图像问题。我决定要采取一种变通办法,使它在最初加载时(填充到设置的位置)时效果很好,但是如果图像发生更改,则不会。
这是自定义渲染器:
string src = null;
NSImage img = null;
CachedImage element = null;
protected override void OnElementChanged(ElementChangedEventArgs<CachedImage> e)
{
base.OnElementChanged(e);
element = (CachedImage)this.Element;
if (Control != null && element != null &&
element.Aspect.ToString() == "AspectFill" &&
element.source != null)
{
Control.Layer = new CoreAnimation.CALayer();
Control.Layer.ContentsGravity = CALayer.GravityResizeAspectFill;
src = element.source.ToString();
if (src.StartsWith("File:"))
{
src = src.Replace("File:","").Trim();
if (src == "")
return;
img = NSImage.ImageNamed(src);
}
else
{
src = src.Replace("Uri:","").Trim();
if (src == "")
return;
img = FromUrl(src);
}
if (img != null)
{
Control.Layer.Contents = img.CGImage;
Control.WantsLayer = true;
}
}
}
private NSImage FromUrl(string uri)
{
try
{
using (var url = new NSUrl(uri))
using (var data = NSData.FromUrl(url))
return new NSImage(data);
}
catch
{
return null;
}
}
public override NSBitmapImageRep BitmapImageRepForCachingdisplayInRect(CGRect rect)
{
return base.BitmapImageRepForCachingdisplayInRect(rect);
}
public override CALayer Layer
{
get
{
return base.Layer;
}
set
{
base.Layer = value;
}
}
解决方法
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