swift 3.0对成员＆＃39;下标＆＃39;的模糊引用

Question

我从URL获取图片并将图片设置为UIImageView并缓存字典。 但是当我将图像设置为字典时，我收到了这个错误：swift 3.0对成员＆＃39;下标＆＃39;的模糊引用。

var imageCache = Dictionary<String, UIImage>()
func getImage(url: String, imageView: UIImageView) {
    let image = self.imageCache[url] as UIImage?
    if image == nil {
        let url = URL(string:url)!
        let req = NSMutableURLRequest(url:url)
        let session = URLSession.shared
        let task = session.dataTask(with: req as URLRequest) { (data, response, error) in
            if data != nil && error == nil {
                let image: UIImage = UIImage(data: data!)!
                imageView.image = image
                self.imageCache[url] = image //******* Here got the error!
            }
        }
        task.resume()
    } else {
        imageView.image = image
    }
}

感谢您的帮助。

Answer 1

您正在使用密钥URL，它无效，将其更改为url.absoluteString，因为您将字典键声明为字符串