用SvgKit在iOS中改变SVG颜色

Question

我使用SVGKit库将svg呈现到图像视图中。Svg渲染完美，但问题是我无法填充SVG的颜色。我发现目标C中很少有对我没有帮助的例子。这里我使用的是Swift5。请找到附加的控制器代码。提前谢谢。

代码：

let namSvgImgVar: SVGKImage = SVGKImage(named: "camera")
let namImjVar: UIImage = namSvgImgVar.uiImage
imageView.image = namImjVar

Answer 1

我已经为相同的内容创建了一个扩展：

extension SVGKImage {

    // MARK:- Private Method(s)
    private func fillColorForSubLayer(layer: CALayer, color: UIColor, opacity: Float) {
        if layer is CAShapeLayer {
            let shapeLayer = layer as! CAShapeLayer
            shapeLayer.fillColor = color.cgColor
            shapeLayer.opacity = opacity
        }

        if let sublayers = layer.sublayers {
            for subLayer in sublayers {
                fillColorForSubLayer(layer: subLayer, color: color, opacity: opacity)
            }
        }
    }

    private func fillColorForOutter(layer: CALayer, color: UIColor, opacity: Float) {
        if let shapeLayer = layer.sublayers?.first as? CAShapeLayer {
            shapeLayer.fillColor = color.cgColor
            shapeLayer.opacity = opacity
        }
    }

    // MARK:- Public Method(s)
    func fillColor(color: UIColor, opacity: Float) {
        if let layer = caLayerTree {
            fillColorForSubLayer(layer: layer, color: color, opacity: opacity)
        }
    }

    func fillOutterLayerColor(color: UIColor, opacity: Float) {
        if let layer = caLayerTree {
            fillColorForOutter(layer: layer, color: color, opacity: opacity)
        }
    }
}

如果您的SVG图像只有一个图层可以使用fillColor，或者如果有多个图层，则可以根据您的需要对其进行修改。我就是这样用它的：

static func getImage(imageName: String, fontSize size: CGSize, fillColor color: UIColor?, opacity: Float = 1.0) -> UIImage? {
    let svgImage: SVGKImage = SVGKImage(named: imageName)
    svgImage.size = size
    if let colorToFill = color {
       svgImage.fillColor(color: colorToFill, opacity: opacity)
    }

   return svgImage.uiImage
}