使用iOS Swift的NSURLConnection
使用iOS Swift的NSURLConnection
提问于 2014-06-12 12:18:25
我正在尝试使用Swift和NSURLConnection跟踪this tutorial并连接到JSON api。我可以看到它正在命中url，但connectionDidFinishLoading似乎没有触发。
import UIKit
class Remote: NSObject {
var host = "http://localhost:3000"
var query = String()
var data: NSMutableData = NSMutableData()
func connect(query:NSString) {
self.query = query
var url = self.document()
var conn = NSURLConnection(request: url, delegate: self, startImmediately: true)
}
func endpoint() -> NSURL {
var query = self.host + self.query
return NSURL(string: query)
}
func document() -> NSURLRequest {
return NSURLRequest( URL: self.endpoint() )
}
func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
// Recieved a new request, clear out the data object
self.data = NSMutableData()
}
func connection(connection: NSURLConnection!, didReceiveData conData: NSData!) {
// Append the recieved chunk of data to our data object
self.data.appendData(conData)
}
func connectionDidFinishLoading(connection: NSURLConnection!) {
// Request complete, self.data should now hold the resulting info
// Convert the retrieved data in to an object through JSON deserialization
var err: NSError
var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(self.data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
println(jsonResult.count)
}
}
// Excecute the code
var remote = Remote()
remote.connect("/apis")在这一点上，我只是想看看返回的数据。一旦我确定这是可行的，我就想把它挂到一个视图控制器上。这样做有什么问题吗?这会导致问题吗？
回答 2
Stack Overflow用户
发布于 2014-06-12 13:45:07
你的代码的一个简化版本对我来说是有效的，
class Remote: NSObject {
var data = NSMutableData()
func connect(query:NSString) {
var url = NSURL.URLWithString("http://www.google.com")
var request = NSURLRequest(URL: url)
var conn = NSURLConnection(request: request, delegate: self, startImmediately: true)
}
func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
println("didReceiveResponse")
}
func connection(connection: NSURLConnection!, didReceiveData conData: NSData!) {
self.data.appendData(conData)
}
func connectionDidFinishLoading(connection: NSURLConnection!) {
println(self.data)
}
deinit {
println("deiniting")
}
}这是我在调用类中使用的代码，
class ViewController: UIViewController {
var remote = Remote()
@IBAction func downloadTest(sender : UIButton) {
remote.connect("/apis")
}
}你没有在你的问题中具体说明你在哪里有这个代码，
var remote = Remote()
remote.connect("/apis")如果var是一个局部变量，那么在connect(query:NSString)方法完成之后，但在数据返回之前，远程类将被释放。正如您从我的代码中看到的，我通常会实现reinit (或dealloc到目前为止)，以确保我的实例何时消失。您应该将它添加到您的远程类中，看看这是否是您的问题。
Stack Overflow用户
发布于 2016-12-05 15:56:25
Swift 3.0
AsynchonousRequest
let urlString = "http://heyhttp.org/me.json"
var request = URLRequest(url: URL(string: urlString)!)
let session = URLSession.shared
session.dataTask(with: request) {data, response, error in
if error != nil {
print(error!.localizedDescription)
return
}
do {
let jsonResult: NSDictionary? = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
print("Synchronous\(jsonResult)")
} catch {
print(error.localizedDescription)
}
}.resume()页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/24176362
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