我正在尝试使用 Alamofire 进行同步请求。我查看了Stackoverflow，并发现了以下问题：使异步alamofire请求同步 。
I am trying to do a synchronous request using Alamofire. I have looked on Stackoverflow and found this question: making an asynchronous alamofire request synchronous.
我看到接受的答案使用完成来制作 Alamofire 请求同步，但是我无法使其工作。这是我的简化代码：
I saw that the accepted answer uses completion to make Alamofire request synchronous but I cannot make it to work. This is my simplified code:
func loadData(completion: (Bool)) -> (Int, [String], [String], [String]){ Alamofire.request(url!, method: .get, parameters: nil, encoding: JSONEncoding.default, headers: nil).responseJSON { response in switch(response.result) { case .success(_): if let JSON = response.result.value as! [[String : AnyObject]]!{ //Here I retrieve the data } completion(true) break case .failure(_): print("Error") completion(false) break } } return (numberRows, nameArray, ageArray, birthdayArray) }使用此代码，我得到一个错误尝试使完成（布尔值）时。我得到的错误如下：
With this code I am getting an error when trying to make completion(bool value). The error that I am getting is the following:
无法调用非函数类型'Bool'的值
Cannot call value of non-function type 'Bool'
我尝试使用很多使用完成的示例来同步获取值（因为我需要先检索数据才能将其显示在表上并同时
I have tried using a lot of examples using completion to get the values synchronously (because I need to retrieve the data before to show it on a table and at the same time get the number of rows of that table) without success.
如何使用该完成来获取同步响应？
How can I use that completion to get a synchronous response?
预先感谢！
推荐答案在使用完成处理程序时不要使用return。
when you use completion handler do not use return.
func loadData(completion: @escaping (_ number: Int, _ strArr1: [String], _ strArr2: [String], _ strArr3: [String]) -> ()){ Alamofire.request(url!, method: .get, parameters: nil, encoding: JSONEncoding.default, headers: nil).responseJSON { response in switch(response.result) { case .success(_): if let JSON = response.result.value as! [[String : AnyObject]]!{ //Here I retrieve the data } completion(number: numberRows, strArr1 : nameArray, strArr2 : ageArray, strArr3: birthdayArray) break case .failure(_): print("Error") completion(number: numberRows, strArr1 : nameArray, strArr2 : ageArray, strArr3: birthdayArray) break } } } loadData (completion: { (number, strArr1, strArr2, strArr3) in // do it // for exapmple self.number = number self.strArr1 = strArr1 // and so on })或者，如果要在闭包中返回任何值，则必须使用完成处理程序返回任何值或类似的东西，例如if您要返回布尔值：
or if you want return any value in closure you must use completion handler for return any value or some thing like, for example if you want return Boolean value:
func loadData(completion:(number: numberRows, strArr1 : nameArray, strArr2 : ageArray, strArr3: birthdayArray) -> (Bool))并在 loadData
loadData( completion: { ( number, strArr1, strArr2, strArr3 ) -> (Bool) in # code return False })或其他人。
我使用swift3。但是，如果要使用另一个版本的swift，请注意外部参数名称和内部参数名称，例如： @转义（_数字：Int，_ strArr1：[String]，_ strArr2：[String]，_ strArr3：[String]）-> （））
I use swift 3. but if you want another version of swift careful about External Parameter Names and internal parameter names, like: @escaping (_ number: Int, _ strArr1: [String], _ strArr2: [String], _ strArr3: [String]) -> ())
如果要设置外部参数名称，只需删除 _ 并设置参数名称。
if you want set external parameter names, just need drop _ and set name for parameters.
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