Swift錯誤：'（（AFHTTPRequestOperation！，NSError？）->不能轉換為'（（AFHTTPRequestOperation？，NSError）->無效？

Question

我正在迅速使用AFNetworking，並且在將以下代碼轉換為迅速時遇到問題

目標C

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

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

}];

Swift代碼 （給出錯誤）

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

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

    })

Answer 1

這應該工作：

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

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

})