C# 无法在Xamarin.iOS中为微光设置渐变层动画

无法使用用于微光的CABasicAnimation设置渐变层动画

CAGradientLayer gradientLayer = new CAGradientLayer();
gradientLayer.Colors = new CGColor[] { UIColor.Black.CGColor, UIColor.White.ColorWithAlpha(0.1F).CGColor, UIColor.Black.CGColor };
gradientLayer.StartPoint = new CGPoint(0, 0.5);
gradientLayer.EndPoint = new CGPoint(1.0, 0.525);
gradientLayer.Locations = new NSNumber[] { 0.4, 0.5, 0.6 };
gradientLayer.Frame = new CGRect(- shimmerView.Frame.Width, 0, 3 * shimmerView.Frame.Width, shimmerView.Frame.Height);

shimmerView.Layer.Mask = gradientLayer;

CABasicAnimation anmtn = new CABasicAnimation();
anmtn.KeyPath = "TransGrad";
anmtn.From = NSArray.FromObjects(new NSNumber[] { 0.0, 0.1, 0.2 });
anmtn.To = NSArray.FromObjects(new NSNumber[] { 0.8, 0.9, 1.0 });
anmtn.Duration = 2;
anmtn.RepeatCount = 1000;
gradientLayer.AddAnimation(animation, "loc");

我能够使用swift中相同的逻辑制作动画。请为Xamarin.iOS提供您的答案

迅捷的

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问题似乎是为动画传递给

KeyPath

的值

CAGradientLayer

没有属性

Transcrad

，因此尝试使用该关键路径添加动画将不起作用

如果仅保留Swift版本的相同关键点路径，则动画的行为应相同：

CAGradientLayer gradientLayer = new CAGradientLayer();
gradientLayer.Colors = new CGColor[] { UIColor.Black.CGColor, UIColor.White.ColorWithAlpha(0.1F).CGColor, UIColor.Black.CGColor };
gradientLayer.StartPoint = new CGPoint(0, 0.5);
gradientLayer.EndPoint = new CGPoint(1.0, 0.525);
gradientLayer.Locations = new NSNumber[] { 0.4, 0.5, 0.6 };
gradientLayer.Frame = new CGRect(- shimmerView.Frame.Width, 0, 3 * shimmerView.Frame.Width, shimmerView.Frame.Height);

shimmerView.Layer.Mask = gradientLayer;

CABasicAnimation anmtn = new CABasicAnimation();
anmtn.KeyPath = "locations";
anmtn.From = NSArray.FromObjects(new NSNumber[] { 0.0, 0.1, 0.2 });
anmtn.To = NSArray.FromObjects(new NSNumber[] { 0.8, 0.9, 1.0 });
anmtn.Duration = 2;
anmtn.RepeatCount = 1000;
gradientLayer.AddAnimation(anmtn, "shimmer");

请注意，它是

“locations”

，而不是

“locations”

，因为此值最终会传递到本机iOS库，因此大小写必须与属性的命名方式匹配

---

如果这不能解决您的问题，您需要提供更多关于您的C#code中的

shimerview

和Swift代码中的

self

以及调用这些代码片段的上下文的信息。

Swift中此逻辑的代码是什么？@adlee dev更新了这篇文章。请检查您似乎根本没有在C代码中设置anmtn.to。很抱歉，在stackOverflow中粘贴代码时出错。

CAGradientLayer gradientLayer = new CAGradientLayer();
gradientLayer.Colors = new CGColor[] { UIColor.Black.CGColor, UIColor.White.ColorWithAlpha(0.1F).CGColor, UIColor.Black.CGColor };
gradientLayer.StartPoint = new CGPoint(0, 0.5);
gradientLayer.EndPoint = new CGPoint(1.0, 0.525);
gradientLayer.Locations = new NSNumber[] { 0.4, 0.5, 0.6 };
gradientLayer.Frame = new CGRect(- shimmerView.Frame.Width, 0, 3 * shimmerView.Frame.Width, shimmerView.Frame.Height);

shimmerView.Layer.Mask = gradientLayer;

CABasicAnimation anmtn = new CABasicAnimation();
anmtn.KeyPath = "locations";
anmtn.From = NSArray.FromObjects(new NSNumber[] { 0.0, 0.1, 0.2 });
anmtn.To = NSArray.FromObjects(new NSNumber[] { 0.8, 0.9, 1.0 });
anmtn.Duration = 2;
anmtn.RepeatCount = 1000;
gradientLayer.AddAnimation(anmtn, "shimmer");