ios - 在 iOS 13 中获取 UIScrollView 的完整屏幕截图

Question

我正在使用 swift 5 和 iOS 13 .我正在尝试截取整个 ScrollView 图像的屏幕截图并打印出来，但底部显示为白色。我怎么解决这个问题？我展示并解释了下图中的所有内容。

我也查了this topic



我的扩展代码是这样的:

extension UIScrollView {

    func screenshot() -> UIImage {

        let savedContentOffset = contentOffset
        let savedFrame = frame

        UIGraphicsBeginImageContextWithOptions(contentSize, false, 0)

        contentOffset = .zero
        frame = CGRect(x: 0, y: 0, width: contentSize.width, height: contentSize.height)
        layer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        contentOffset = savedContentOffset
        frame = savedFrame

        return image ?? UIImage()

    }

}

Answer 1

这是对我有用的代码片段。

extension UIView {
    
    func snapshot(scrollView: UIScrollView) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, false, UIScreen.main.scale)
        layer.render(in: UIGraphicsGetCurrentContext()!)
        let savedContentOffset = scrollView.contentOffset
        let savedFrame = frame
        
        scrollView.contentOffset = CGPoint.zero
        frame = CGRect(x: 0, y: 0, width: scrollView.contentSize.width, height: scrollView.contentSize.height)
        
        layer.render(in: UIGraphicsGetCurrentContext()!)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        
        scrollView.contentOffset = savedContentOffset
        frame = savedFrame
        
        UIGraphicsEndImageContext()
        
        return image
    }
}

当你调用它时:

view.snapshot(scrollView: scrollView)