在swift ios中从JSON响应访问值
我有一个api，它返回json响应 我想从响应中访问参数swebformatur和标记。我发出了URL会话请求，获取的数据如下所示。如何从swift中的响应中查询和访问这些参数。我是编程新手，请用swift推荐我在swift ios中从JSON响应访问值,ios,json,swift,Ios,Json,Swift,我有一个api，它返回json响应 我想从响应中访问参数swebformatur和标记。我发出了URL会话请求，获取的数据如下所示。如何从swift中的响应中查询和访问这些参数。我是编程新手，请用swift推荐我 //Mark:- Method to fetch data from the url func getDataFromUrl(){ let url = URL(string: "https://pixabay.com/api/?key=10961259-e4e939648ed5
//Mark:- Method to fetch data from the url
func getDataFromUrl(){
let url = URL(string: "https://pixabay.com/api/?key=10961259-e4e939648ed5abb6879f1fbbc&q=yellow+flowers&image_type=photo")
let request = NSMutableURLRequest(url: url!)
request.httpMethod = "GET"
let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
if error == nil
{
do
{
let respDict = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments)
print("Some Data: \(respDict)")
}
catch let error2 as NSError
{
print(error2)
}
}
})
dataTask.resume()
}
{
"totalHits": 500,
"hits": [
{
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"webformatHeight": 426,
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"id": 3063284,
"user_id": 1564471,
"views": 476351,
"comments": 191,
"pageURL": "https://pixabay.com/en/rose-flower-petal-floral-noble-3063284/",
"imageHeight": 4000,
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"type": "photo",
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},
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"imageSize": 4290219,
"previewWidth": 150,
"userImageURL": "https://cdn.pixabay.com/user/2017/02/22/12-32-00-453_250x250.jpg",
"previewURL": "https://cdn.pixabay.com/photo/2017/06/15/10/25/summer-2404769_150.jpg"
},
{
"largeImageURL": "https://pixabay.com/get/ea33b50f21f7043ed1584d05fb1d4796ea71e3d71cb80c4090f4c57ca4e4b6b8df_1280.jpg",
"webformatHeight": 426,
"webformatWidth": 640,
"likes": 213,
"imageWidth": 5574,
"id": 3640935,
"user_id": 334088,
"views": 103667,
"comments": 54,
"pageURL": "https://pixabay.com/en/sunflowers-field-woman-yellow-3640935/",
"imageHeight": 3717,
"webformatURL": "https://pixabay.com/get/ea33b50f21f7043ed1584d05fb1d4796ea71e3d71cb80c4090f4c57ca4e4b6b8df_640.jpg",
"type": "photo",
"previewHeight": 99,
"tags": "sunflowers, field, woman",
"downloads": 86701,
"user": "jill111",
"favorites": 186,
"imageSize": 4970597,
"previewWidth": 150,
"userImageURL": "https://cdn.pixabay.com/user/2018/06/27/01-23-02-27_250x250.jpg",
"previewURL": "https://cdn.pixabay.com/photo/2018/08/29/22/52/sunflowers-3640935_150.jpg"
}
],
"total": 17148
}
struct Root : Decodable {
let totalHits : Int
let hits : [Hit]
}
struct Hit : Decodable {
let webformatURL : URL
let tags : String
}
func getDataFromUrl() {
let url = URL(string: "https://pixabay.com/api/?key=10961259-e4e939648ed5abb6879f1fbbc&q=yellow+flowers&image_type=photo")
let session = URLSession.shared
let dataTask = session.dataTask(with: url!) { data, response, error in
guard let data = data else { print(error!); return }
do {
let result = try JSONDecoder().decode(Root.self, from: data)
let hits = result.hits
for hit in hits {
print("webformatURL: ", hit.webformatURL, "tags:", hit.tags)
}
} catch {
print(error)
}
}
dataTask.resume()
}
getDataFromUrl()
在这种情况下不需要URL请求，也不要在Swift中使用NSMutableURLRequest。现在您已经在字典中找到了响应，您可以执行以下操作以获得点击：
好了 您将获得一个带有键的JSON对象： 总点击数 击打 全部的 在上述三个键中，https的值是另一个JSON数组，其中包含许多JSON对象。你可以通过
let respDict = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as! [String:Any]
let httpDictArray = respDict["hits"] as! [Any]
for dictionary in httpDictArray{
if let dict = dictionary as? [String:Any]
{
let webFormatUrl = dict["webformatURL"] as! String
let tags = dict["tags"] as! String
}
}
let tagArray = tags.components(separatedBy: ", ")
这是一个简单的方法
struct HitResponse: Codable {
var total: Int
var totalHits: Int
var hits: [HitObject]
}
struct HitObject: Codable {
var largeImageURL: String
var webformatHeight: Int
var webformatWidth: Int
var likes: Int
var imageWidth: Int
var id: Int
var user_id: Int
var views: Int
var comments: Int
var pageURL: String
var imageHeight: Int
var webformatURL: String
var type: String
var previewHeight: Int
var tags: String
var downloads: Int
var user: String
var favorites: Int
var imageSize: Int
var previewWidth: Int
var userImageURL: String
var previewURL: String
}
enum APIResponse {
case success(result: Result)
case error(error: Error)
}
struct Result{
var object: Any
}
class APIRequester {
static func request(for url: URL, completionHandler: @escaping (_ response: APIResponse)->Void) {
let sesseion = URLSession.shared
let task = sesseion.dataTask(with: url) { (data, urlResponse, error) in
// data mapping to model
if let lData = data {
do {
let decode = try JSONDecoder().decode(HitResponse.self, from: lData)
let responseMap: APIResponse = .success(result: Result(object: decode))
completionHandler(responseMap)
}catch let mappingError {
let responseMap: APIResponse = .error(error: mappingError)
completionHandler(responseMap)
}
}
//fall back original error
let responseMap: APIResponse = .error(error: error!)
completionHandler(responseMap)
}
task.resume()
}
}
// Usage
let url = URL(string: "https://pixabay.com/api/?key=10961259-e4e939648ed5abb6879f1fbbc&q=yellow+flowers&image_type=photo")
APIRequester.request(for: url!) { (response) in
switch response {
case .success(let result):
if let hitResponse = result.object as? HitResponse {
for hit in hitResponse.hits {
//the final output
print(hit.tags)
print(hit.webformatURL)
print("\n")
}
}
case .error(let error):
// handle error
print("error \(error)")
}
}
我已经更新了代码。请现在试一试。谢谢
let tagArray = tags.components(separatedBy: ", ")
struct HitResponse: Codable {
var total: Int
var totalHits: Int
var hits: [HitObject]
}
struct HitObject: Codable {
var largeImageURL: String
var webformatHeight: Int
var webformatWidth: Int
var likes: Int
var imageWidth: Int
var id: Int
var user_id: Int
var views: Int
var comments: Int
var pageURL: String
var imageHeight: Int
var webformatURL: String
var type: String
var previewHeight: Int
var tags: String
var downloads: Int
var user: String
var favorites: Int
var imageSize: Int
var previewWidth: Int
var userImageURL: String
var previewURL: String
}
enum APIResponse {
case success(result: Result)
case error(error: Error)
}
struct Result{
var object: Any
}
class APIRequester {
static func request(for url: URL, completionHandler: @escaping (_ response: APIResponse)->Void) {
let sesseion = URLSession.shared
let task = sesseion.dataTask(with: url) { (data, urlResponse, error) in
// data mapping to model
if let lData = data {
do {
let decode = try JSONDecoder().decode(HitResponse.self, from: lData)
let responseMap: APIResponse = .success(result: Result(object: decode))
completionHandler(responseMap)
}catch let mappingError {
let responseMap: APIResponse = .error(error: mappingError)
completionHandler(responseMap)
}
}
//fall back original error
let responseMap: APIResponse = .error(error: error!)
completionHandler(responseMap)
}
task.resume()
}
}
// Usage
let url = URL(string: "https://pixabay.com/api/?key=10961259-e4e939648ed5abb6879f1fbbc&q=yellow+flowers&image_type=photo")
APIRequester.request(for: url!) { (response) in
switch response {
case .success(let result):
if let hitResponse = result.object as? HitResponse {
for hit in hitResponse.hits {
//the final output
print(hit.tags)
print(hit.webformatURL)
print("\n")
}
}
case .error(let error):
// handle error
print("error \(error)")
}
}