神奇的错误

imageView.kf.setImage(with: url, placeholder: placeHolder, options: nil, progressBlock: nil, completionHandler: nil)

改成

imageView.kf.setImage(with: url, placeholder: placeHolder, options: nil, progressBlock: nil) { (reslt) in
                
            }

或者

imageView.kf.setImage(with: url, placeholder: placeHolder)

completionHandler 不能传nil，原因不明确，敬请大神告知，十分感谢！！