swift 3.0 对成员'subscript'的模糊引用

Question

我从 URL获取图像，并将图像设置为 UIImageView和cache dictionary。但是，当我将图像设置为字典时，我得到了一个错误：swift 3.0含糊其含义对成员"下标"。

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

您使用的是键为 URL，它不起作用，将其更改为 url.absoluteString，因为您将字典键称为字符串