使异步alamofire请求同步 [英] making an asynchronous alamofire request synchronous
本文介绍了使异步alamofire请求同步的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正试图在swift中执行alamofire post请求
I am attempting to perform an alamofire post request in swift
func checkIfUserExistsInDB(userName: String) -> NSString
{
print ("IN")
var info: NSString = ""
Alamofire.request(.POST, "http://blablabla.com/getuserdata", parameters: ["queryValue": userName,], encoding:.JSON).responseJSON { request, response, result in
switch result {
case .Success(let JSON):
info = NSString(data: JSON.dataUsingEncoding(NSUTF8StringEncoding)!, encoding: NSUTF8StringEncoding)!
case .Failure(let data, _):
print ("IN")
if let data = data {
info = (NSString(data: data, encoding: NSUTF8StringEncoding)!)
print (info)
}
}
}
return info
}
但我遇到了同步问题。我知道制作异步函数(如Alamorfire提供的函数)通常不被接受,但在我的情况下我必须同步执行。
but I am running into trouble making it synchronously. I am aware that making an asynchronous function (like the one provided by Alamorfire) is not generally accepted but in my case I have to do it synchronously.
推荐答案
在Swift中实现完成块非常容易。
It's quite easy to implement a completion block in Swift.
这是带有完成块的函数
func checkIfUserExistsInDB(userName: String, completion:(String) -> Void)
{
Alamofire.request(.POST, "http://blablabla.com/getuserdata", parameters: ["queryValue": userName,], encoding:.JSON).responseJSON { request, response, result in
switch result {
case .Success(let JSON):
let info = String(data: JSON.dataUsingEncoding(NSUTF8StringEncoding)!, encoding: NSUTF8StringEncoding)!
completion(info)
case .Failure(let data, _):
if let errorData = data, info = String(data: errorData, encoding: NSUTF8StringEncoding) {
completion(info)
}
}
}
}
并且可以调用( info
是异步返回的字符串)
and can be called with (info
is the asynchronously returned string)
checkIfUserExistsInDB("string") { (info) in
print(info)
}
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