我已经创建了一个客户服务类来从web api发出调用GET请求。我尝试扩展但有更多网络方法POST，PUT，Delete。我没有找到如何使用swift closure创建POST，PUT，Delete的好例子.I只是想问一下如何将POST，PUT，Delete添加到客户端服务？
import Foundation
class ClientService{
func getClients(searchstring:String,pageNumber:Int,callBack:(NSArray)->()){
request("\(_settings.baseUrl)Client/\(searchstring)/\(String(pageNumber))/rrn/brns", callBack: callBack)
}
func request(url:String,callBack:(NSArray)->()){
let nsURL = NSURL(string:url);
let task = NSURLSession.sharedSession().dataTaskWithURL(nsURL!){
(data,response,error) in
do {
let response = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSArray
callBack(response)
} catch let error as NSError {
print("json error: \(error.localizedDescription)")
}
}
task.resume()
}
init(){
self._settings = Settings();
}
var _settings:Settings!;
}
答案 0 :(得分：4)
你走在正确的轨道上。我为get，post，put，delete等创建了一个单独的函数。但如果你愿意，你可以在一个函数中创建它们。
请记住，此代码仅用于说明如何执行此操作。您需要根据需要进行修改。
func request(url:String, method: String, params: [String: String], completion: ([AnyObject])->() ){
if let nsURL = NSURL(string:url) {
let request = NSMutableURLRequest(URL: nsURL)
if method == "POST" {
// convert key, value pairs into param string
postString = params.map { "\($0.0)=\($0.1)" }.joinWithSeparator("&")
request.HTTPMethod = "POST"
request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
}
else if method == "GET" {
postString = params.map { "\($0.0)=\($0.1)" }.joinWithSeparator("&")
request.HTTPMethod = "GET"
}
else if method == "PUT" {
putString = params.map { "\($0.0)=\($0.1)" }.joinWithSeparator("&")
request.HTTPMethod = "PUT"
request.HTTPBody = putString.dataUsingEncoding(NSUTF8StringEncoding)
}
// Add other verbs here
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
(data, response, error) in
do {
// what happens if error is not nil?
// That means something went wrong.
// Make sure there really is some data
if let data = data {
let response = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers)
completion(response)
}
else {
// Data is nil.
}
} catch let error as NSError {
print("json error: \(error.localizedDescription)")
}
}
task.resume()
}
else{
// Could not make url. Is the url bad?
// You could call the completion handler (callback) here with some value indicating an error
}
}
这样称呼：
request("http://somedomain.etc", "POST", ["key1" : "value1", "key2", "values2"]) {
(result) in
// Handle result here.
}
你会注意到我消灭了NSArray。 [AnyObject]是Swift的方法。
我建议您在完成处理程序中添加某种错误指示符。这样可以让你发现出现问题并处理它。
使用时要非常谨慎！解开变量。这是应用程序崩溃的最常见原因。
答案 1 :(得分：2)
我用于mes项目Alamofire（Swift中的优雅HTTP网络），我喜欢它
如何使用POST
的示例let parameters = [
"foo": "bar",
"baz": ["a", 1],
"qux": [
"x": 1,
"y": 2,
"z": 3
]
]
Alamofire.request(.POST, "https://httpbin.org/post", parameters: parameters)
// HTTP body: foo=bar&baz[]=a&baz[]=1&qux[x]=1&qux[y]=2&qux[z]=3
以及如何使用删除
Alamofire.request(.DELETE, "https://httpbin.org/delete")
去文档是非常好的 https://github.com/Alamofire/Alamofire 如果你想在没有框架的情况下使用swift
这是如何使用POST的示例
var request = NSMutableURLRequest(URL: NSURL(string: "http://localhost:4567/login"))
var session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"
var params = ["username":"jameson", "password":"password"] as Dictionary<String, String>
var err: NSError?
request.HTTPBody = NSJSONSerialization.dataWithJSONObject(params, options: nil, error: &err)
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
println("Response: \(response)")
var strData = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Body: \(strData)")
var err: NSError?
var json = NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error: &err) as? NSDictionary
// Did the JSONObjectWithData constructor return an error? If so, log the error to the console
if(err != nil) {
println(err!.localizedDescription)
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Error could not parse JSON: '\(jsonStr)'")
}
else {
// The JSONObjectWithData constructor didn't return an error. But, we should still
// check and make sure that json has a value using optional binding.
if let parseJSON = json {
// Okay, the parsedJSON is here, let's get the value for 'success' out of it
var success = parseJSON["success"] as? Int
println("Succes: \(success)")
}
else {
// Woa, okay the json object was nil, something went worng. Maybe the server isn't running?
let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Error could not parse JSON: \(jsonStr)")
}
}
})
task.resume()
答案 2 :(得分：1)
答案 3 :(得分：1)
Swift 4版本（我认为）：
func restRequest(url:String, method: String, params: [String: String], completion: @escaping ([AnyObject])->() ){
if let nsURL = NSURL(string:url) {
let request = NSMutableURLRequest(url: nsURL as URL)
if method == "POST" {
// convert key, value pairs into param string
let postString = params.map { "\($0.0)=\($0.1)" }.joined(separator: "&")
request.httpMethod = "POST"
request.httpBody = postString.data(using: String.Encoding.utf8)
}
else if method == "GET" {
let postString = params.map { "\($0.0)=\($0.1)" }.joined(separator: "&")
request.httpMethod = "GET"
}
else if method == "PUT" {
let putString = params.map { "\($0.0)=\($0.1)" }.joined(separator: "&")
request.httpMethod = "PUT"
request.httpBody = putString.data(using: String.Encoding.utf8)
}
// Add other verbs here
let task = URLSession.shared.dataTask(with: request as URLRequest) {
(data, response, error) in
do {
// what happens if error is not nil?
// That means something went wrong.
// Make sure there really is some data
if let data = data {
let response = try JSONSerialization.JSONObjectWithData(data, options: JSONSerialization.ReadingOptions.MutableContainers)
completion(response)
}
else {
// Data is nil.
}
} catch let error as NSError {
print("json error: \(error.localizedDescription)")
}
}
task.resume()
}
else{
// Could not make url. Is the url bad?
// You could call the completion handler (callback) here with some value indicating an error
}
}