无法将类型'(String) - > Void'的值转换为期望的参数类型'((AnyObject!) - > Void)!'
问题描述:
我想通过点击captureDoc按钮来捕获图像。但是,当我突然写了这个功能,我在完成处理的上述错误,无法将类型'(String) - > Void'的值转换为期望的参数类型'((AnyObject!) - > Void)!'
self.scanDoc.captureImageWithCompletionHander({(imageFilePath: String) -> Void in
而且我没有得到什么地方出了错。 下面是我的captureDoc函数的代码。
@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
})
})
}
答
变化的最后一行,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 })
})
}
让它只是'imageFilePath',而不是'(imageFilePath:字符串) - > Void'。 – Dershowitz123
当我做了你所说的在下一行给我一个错误时,错误是'AnyObject!'不能转换为'String';你的意思是使用'as!'强迫低调?在第四行,我宣布captureImageView,当我向下转换为字符串,然后它显示我'imageWithContentsOfFile'的另一个错误是不可用的:使用对象结构'UIImage(contentsOfFile :)'@ Dershowitz123 –