swift - 表达式类型 "(_, _) -> Void"在没有更多上下文的情况下不明确

Question

请在下面的代码中帮助我。我收到一个错误:

Expression type "(_, _) -> Void" is ambiguous without more context.

import UIKit
import SDWebImage

class CustomImageView: UIImageView {
    let progressIndicatorView = CircularLoaderView(frame: CGRect.zero)

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!

        addSubview(self.progressIndicatorView)
        progressIndicatorView.frame = bounds
        progressIndicatorView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

        let url = NSURL(string: "http://png-3.findicons.com/files/icons/2795/office_2013_hd/2000/word.png")
        self.sd_setImage(with: url as URL?, placeholderImage: nil, options: .cacheMemoryOnly, progress: { [weak self] (receivedSize, expectedSize) -> Void in
            self.progressIndicatorView.progress = CGFloat(receivedSize)/CGFloat(expectedSize)
        }) { [weak self](image, error, _, _) -> Void in
            self.progressIndicatorView.reveal()
        }
    }
}

Answer 1

将 NSURL 更改为 URL 应该可行!