如何将UIView转换为高分辨率的UIImage?

时间:2017-06-13 01:57:35

标签: ios swift uiview uiimage

有关如何使用view.drawHierarchy(in:)view.layer.renderInContext()将UIView转换为UIImage的讨论。但是,即使将比例设置为设备比例,结果仍然是非常糟糕的分辨率。我想知道是否有办法以高分辨率和高质量将UIView转换为UIImage?

1 个答案:

答案 0 :(得分:2)

您需要在每个子视图上设置正确的内容比例。

extension UIView {   
    func scale(by scale: CGFloat) {
        self.contentScaleFactor = scale        
        for subview in self.subviews {
            subview.scale(by: scale)
        }
    }

    func getImage(scale: CGFloat? = nil) -> UIImage {
        let newScale = scale ?? UIScreen.main.scale
        self.scale(by: newScale)

        let format = UIGraphicsImageRendererFormat()
        format.scale = newScale

        let renderer = UIGraphicsImageRenderer(size: self.bounds.size, format: format)

        let image = renderer.image { rendererContext in            
            self.layer.render(in: rendererContext.cgContext)
        }

        return image
    }
}

创建图片:

let image = yourView.getImage()