快速错误：'(AFHTTPRequestOperation！，NSError？) ->不可转换为'((AFHTTPRequestOperation？，NSError) ->？

Question

我正在使用AFNetworking，并且在将下面的代码转换为swift时遇到了一个问题

目标C

[client GET:url parameters:nil success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {

} failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {

}];

快速代码(给出错误)

self.client.GET(url,
        parameters: nil,
        success: { (operation: AFHTTPRequestOperation!, responseObject: AnyObject!) in

        },
        failure: { (operation: AFHTTPRequestOperation!, error: NSError!) in

    })

Answer 1

这应该是可行的：

self.client.GET(url, parameters: nil, success: { (operation: AFHTTPRequestOperation, responseObject: AnyObject?) in

}, failure: { (operation: AFHTTPRequestOperation?, error: NSError) in

})