Question

我正在尝试截取UIImageview对象覆盖的区域的屏幕快照。我已经用一些UILabel对象覆盖了图像，并且只想保存该区域的镜头

我尝试过

 UIGraphicsBeginImageContext(self.view.frame.size)
        view.drawHierarchy(in: self.view.frame, afterScreenUpdates: true)
        let memedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

但这给了我整个屏幕的画面

我也尝试过

UIGraphicsBeginImageContext(imageHolder.frame.size)
        view.drawHierarchy(in: self.view.frame, afterScreenUpdates: true)
        let memedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

这给了我屏幕上半部的矩形

Answer 1

如果将UILabel作为子视图添加到UIImageView，则可以使用类似的扩展功能来捕获图像视图及其子视图（标签）的图像上下文。

extension UIImageView {

    func renderSubviewsToImage() -> UIImage? {

        guard let image = image else { return nil }

        let scale = UIScreen.main.scale
        UIGraphicsBeginImageContextWithOptions(image.size, false, scale)

        guard let context = UIGraphicsGetCurrentContext() else { return nil }
        self.layer.render(in: context)

        let renderedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        return renderedImage

    }

}

Answer 2

view.drawHierachy实际上接受边界作为边界而不是框架我将假定图像实际上是UIImageView

var bounds= CGRect(x: -image.frame.minX,y: -image.frame.minY,width: view.bounds.size.width,height: view.bounds.size.height)

UIGraphicsBeginImageContext(image.frame.size)
        view.drawHierarchy(in: bounds, afterScreenUpdates: true)
        let outputImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
        UIGraphicsEndImageContext()

截取UIImageView对象覆盖的区域的屏幕截图

2 个答案: