swift - 无法将类型“（String）-> Void”的值转换为预期的参数类型“（（AnyObject！）-> Void）！”

Question

我正在尝试通过点击 captureDoc 按钮来捕获图像。但是当我突然写这个函数时，我在完成处理程序中得到了上述错误，

 self.scanDoc.captureImageWithCompletionHander({(imageFilePath: String) -> Void in

而且我不明白出了什么问题。下面是我的 captureDoc 函数代码。

@IBAction func captureDoc(sender: AnyObject) {
    weak var weakSelf = self
            self.scanDoc.captureImageWithCompletionHander({(imageFilePath: String) -> Void in
                var captureImageView: UIImageView = UIImageView(image: UIImage.imageWithContentsOfFile(imageFilePath)!)
                captureImageView.backgroundColor = UIColor(white: 0.0, alpha: 0.7)
                captureImageView.frame = CGRectOffset(weakSelf.view.bounds, 0, -weakSelf.view.bounds.size.height)
                captureImageView.alpha = 1.0
                captureImageView.contentMode = .ScaleAspectFit
                captureImageView.userInteractionEnabled = true
                weakSelf.view!.addSubview(captureImageView)
                var dismissTap: UITapGestureRecognizer = UITapGestureRecognizer(target: weakSelf, action: #selector(self.dismissPreview))
                captureImageView.addGestureRecognizer(dismissTap)
                UIView.animateWithDuration(0.7, delay: 0.0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.7, options: .AllowUserInteraction, animations: {() -> Void in
                    captureImageView.frame = weakSelf.view.bounds
                })

            })

}

Answer 1

改变最后一行，它应该工作

@IBAction func captureDoc(_ sender: UIButton) {
weak var weakSelf = self
        self.scanDoc.captureImageWithCompletionHander({(imageFilePath: String?) -> Void in
            var captureImageView: UIImageView = UIImageView(image: UIImage.imageWithContentsOfFile(imageFilePath!)!)
            captureImageView.backgroundColor = UIColor(white: 0.0, alpha: 0.7)
            captureImageView.frame = CGRectOffset(weakSelf.view.bounds, 0, -weakSelf.view.bounds.size.height)
            captureImageView.alpha = 1.0
            captureImageView.contentMode = .ScaleAspectFit
            captureImageView.userInteractionEnabled = true
            weakSelf.view!.addSubview(captureImageView)
            var dismissTap: UITapGestureRecognizer = UITapGestureRecognizer(target: weakSelf, action: #selector(self.dismissPreview))
            captureImageView.addGestureRecognizer(dismissTap)
            UIView.animateWithDuration(0.7, delay: 0.0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.7, options: .AllowUserInteraction, animations: {() -> Void in
                captureImageView.frame = weakSelf.view.bounds
            }, completion: { _ in })

        })

}