swift 高清截图 ScrollView截图

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extension UIScrollView {    var capture: UIImage? {        var image: UIImage? = nil        UIGraphicsBeginImageContext(self.contentSize)        do {            let savedContentOffset = self.contentOffset            let savedFrame = self.frame            self.contentOffset = .zero            self.frame = CGRect(x: 0, y: 0, width: self.contentSize.width, height: self.contentSize.height)            UIGraphicsBeginImageContextWithOptions(CGSize(width: self.contentSize.width, height: self.contentSize.height), false, 0.0)            self.layer.render(in: UIGraphicsGetCurrentContext()!)            image = UIGraphicsGetImageFromCurrentImageContext()            self.contentOffset = savedContentOffset            self.frame = savedFrame        }        UIGraphicsEndImageContext()        if image != nil {            return image!        }        return nil    }}

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