贡献者:赵大财
博客:https://my.oschina.net/zhaodacaiGitHub:https://github.com/dacaizhao
邮箱: dacai_zhao@163.com QQ:327532817
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//实现代理 NSCopying

func copy(with zone: NSZone? = nil) -> Any {
        return type(of: self).init()
    }

//let myCollectionViewCell: YouCollectionViewCell = item[1].copy() as! YouCollectionViewCell