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func saveToLocal() {        //截屏        let screenRect = UIScreen.main.bounds        UIGraphicsBeginImageContext(screenRect.size)        let ctx:CGContext = UIGraphicsGetCurrentContext()!        self.view.layer.render(in: ctx)        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext();                //保存相册        UIImageWriteToSavedPhotosAlbum(image!, self, Selector("image:didFinishSavingWithError:contextInfo:"), nil)            }        func image(image:UIImage,didFinishSavingWithError error:NSError?,contextInfo:AnyObject) {                if error != nil {//            截屏成功        } else {//            截屏失败        }    }

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