Swift- Working with rest service
protocol - rules
subdomain - point a more specifc server or etc
domain - unique reference to specific site
port -
path - refer specifi sub directory or file
query param - more detail of request
request type - GET, POST etc
headers - key value pair which tells server how to handle the request
response also has header which describe how the client use the information
body - data send or received
playgroud setup for network request
playground default support for synchronous request. means lines runs top to bottom. so to call network requet has some changes in playground. add these lines in top
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
///////////////////////
like in java we can seperately invoke service call and get the response as callback function. everything step by step in here. last class is using all concepts
import Foundation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true // make playgroud to run asnchronous request
//let url = URL(string: "https://api.nasa.gov/planetary/apod?api_key=NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo")!
//let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
//// if let data = data {
//// print(data) // print as bytes
//// print(data as? NSData)// print as object
//// }
//
// //get as json object
// if let data = data,
// let string = String(data: data, encoding: .utf8) {
// print(string)
// }
// // end of return json object
//}
//
//task.resume()
///////////////////////////////////////////////////////////
// add query parameters seperately
//extension URL {
// func withQueries(_ queries: [String: String]) -> URL? {
// var components = URLComponents(url: self, resolvingAgainstBaseURL: true)
// components?.queryItems = queries.flatMap
// { URLQueryItem(name: $0.0, value: $0.1) }
// return components?.url
// }
//}
//
//let baseURL = URL(string: "https://api.nasa.gov/planetary/apod")!
//let query: [String: String] = [
// "api_key": "NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo",
// "date": "2011-07-13"
//]
//
//let url = baseURL.withQueries(query)!
//let task = URLSession.shared.dataTask(with: url) { (data,
// response, error) in
// if let data = data,
// let string = String(data: data, encoding: .utf8) {
// print(string)
// }
//}
//
//task.resume()
///////////////////////////////////////////////////////////
/*josn serilization
struct PropertyKey {
static let title = "title"
static let description = "explanation"
static let url = "url"
static let copyright = "copyright"
}
class PhotoInfo{
var url : URL
var description : String
var title : String
var copyright : String?
init?(json: [String: Any]) {
guard let title = json[PropertyKey.title] as? String,
let description = json[PropertyKey.description] as? String,
let urlString = json[PropertyKey.url] as? String,
let url = URL(string: urlString) else { return nil }
self.url = url
self.description = description
self.title = title
self.copyright = json[PropertyKey.copyright] as? String
}
}
extension URL {
func withQueries(_ queries: [String: String]) -> URL? {
var components = URLComponents(url: self, resolvingAgainstBaseURL: true)
components?.queryItems = queries.flatMap
{ URLQueryItem(name: $0.0, value: $0.1) }
return components?.url
}
}
let baseURL = URL(string: "https://api.nasa.gov/planetary/apod")!
let query: [String: String] = [
"api_key": "NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo",
"date": "2011-07-13"
]
let url = baseURL.withQueries(query)!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if let data = data,
let rawJSON = try? JSONSerialization.jsonObject(with:data),
let json = rawJSON as? [String: String],
let photoInfo = PhotoInfo(json:json) {
print(photoInfo)
}
// to get normal json object use this way
// if let data = data,
// let rawJSON = try? JSONSerialization.jsonObject(with:
// data),
// let json = rawJSON as? [String: String] {
// print(json)
// }
}
task.resume()
**/
//////////////////////////
//getting a callback with params
/* func performLongRunningOperation(callbackFuncName: @escaping (retunFunctionParam1,retunFunctionParam2) ->
Void) {
// Code that performs a long running operation
successFunc(returnParam1Value,returnParam2Value)
}
//example
func callService (callbackFunc : @escaping (String, Int) -> Void) {
callbackFunc("hi", 10)
}
// pass callback function as parameter and other parameters also
func callService (urlStr : String, callbackFunc : @escaping (String, Int) -> Void) {
callbackFunc("hi", 10)
}
callService (urlStr: "sss",callbackFunc : { (strVal,intVal) in
print(strVal)
})
*/
///////////////////////////// network request with callback
struct PropertyKey {
static let title = "title"
static let description = "explanation"
static let url = "url"
static let copyright = "copyright"
}
class PhotoInfo{
var url : URL
var description : String
var title : String
var copyright : String?
init?(json: [String: Any]) {
guard let title = json[PropertyKey.title] as? String,
let description = json[PropertyKey.description] as? String,
let urlString = json[PropertyKey.url] as? String,
let url = URL(string: urlString) else { return nil }
self.url = url
self.description = description
self.title = title
self.copyright = json[PropertyKey.copyright] as? String
}
}
extension URL {
func withQueries(_ queries: [String: String]) -> URL? {
var components = URLComponents(url: self, resolvingAgainstBaseURL: true)
components?.queryItems = queries.flatMap
{ URLQueryItem(name: $0.0, value: $0.1) }
return components?.url
}
}
//The @escaping keyword tells the compiler that the code in the closure will be executed after the function has returned, or has finished executing all the code.
func callService(urlStr:String , funcCallback : @escaping (PhotoInfo) -> Void) {
let baseURL = URL(string: urlStr)!
let query: [String: String] = [
"api_key": "NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo",
"date": "2011-07-13"
]
//here multiple conditions checking using , instear && mark
let url = baseURL.withQueries(query)!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if let data = data,
let rawJSON = try? JSONSerialization.jsonObject(with:data),
let json = rawJSON as? [String: String],
let photoInfo = PhotoInfo(json:json) {
funcCallback(photoInfo)
}
}
// if let data = data{
// print(data)
// let rawJSON = try? JSONSerialization.jsonObject(with:data)
// if let jsona = rawJSON as? [String: String] {
// if let photoInfoa = PhotoInfo(json:jsona){
// funcCallback(photoInfoa)
// }
// }
// }
task.resume()
}
var urls = "https://api.nasa.gov/planetary/apod"
callService (urlStr: urls, funcCallback: { (photoInfoObj ) in
print(photoInfoObj.title)
} )
//we can call this way also.
callService (urlStr: urls) { (photoInfoObj ) in
print(photoInfoObj.title)
}
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