func saveToLocal() {        //截屏        let screenRect = UIScreen.mainScreen().bounds        UIGraphicsBeginImageContext(screenRect.size)        let ctx:CGContextRef = UIGraphicsGetCurrentContext()!        self.view.layer.renderInContext(ctx)        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext();                //保存相册        UIImageWriteToSavedPhotosAlbum(image!, self, "image:didFinishSavingWithError:contextInfo:", nil)            }        func image(image:UIImage,didFinishSavingWithError error:NSError?,contextInfo:AnyObject) {                if error != nil {            K12ProgressHUD.showError("保存失败", view: self.view)        } else {            K12ProgressHUD.showSucess("保存成功", view: self.view)        }    }

　　

 

swift3  截屏

func getScreenImage() -> UIImage {        //截屏        let screenRect = UIScreen.main.bounds        UIGraphicsBeginImageContext(screenRect.size)        let ctx:CGContext = UIGraphicsGetCurrentContext()!        self.view.layer.render(in: ctx)        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext();        return image!    }