如何在Swift 3中获取JSON来填充UITableView?
问题描述：
我无法显示数据.我已经从MCViewController自定义类发布了我的代码.它不会建立.但是我确实在控制台中得到了数据响应.有人可以向我指出我做错了什么吗?
I am having trouble getting data to display. I have posted my code from the MCViewController custom class. It won't build. However I do get data response in the console. Can someone point out to me what I did wrong?
class MCViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
let message_url = "https://www.testing.com/api/resources/get_film_message/film_id/3825"
let send_url = "https://www.testing.com/api/resources/send_film_message"
let film_id = "3825"
var messageArray = [String]()
weak var messageView : UITableView!
func messageView(_ messageView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messageArray.count
}
func messageView(_ messageView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = messageView.dequeueReusableCell(withIdentifier: "msgContent", for:indexPath) as! MessageTableViewCell
// Configuring Cell
cell.msgContent.text = messageArray[indexPath.row]
// Returning the cell
return cell
}
@IBOutlet weak var MessageInput: UITextField!
@IBAction func Sendmsg(_ sender: Any) {
Sendmsg(username:MessageInput.text!, password: film_id)
}
override func viewDidLoad() {
super.viewDidLoad()
messageView.dataSource = self
messageView.delegate = self
// Do any additional setup after loading the view.
//let post_data: NSDictionary = NSMutableDictionary()
// post_data.setValue(username, forKey: "username")
// post_data.setValue(password, forKey: "password")
let url:URL = URL(string: message_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "GET"
request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
// Do any additional setup after loading the view.
var paramString = ""
// for (key, value) in post_data
// {
// paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
// }
//
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
if let parsedData = json as? [[String:Any]] {
for dict in parsedData {
if let title = dict["message"] as? String {
self.messageArray.append(title)
print(json)
}
}
}
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
if let data_block = server_response["data"] as? NSDictionary
{
if let session_data = data_block["session"] as? String
{
// self.login_session = session_data
let preferences = UserDefaults.standard
preferences.set(session_data, forKey: "session")
// DispatchQueue.main.async(execute: self.LoginDone)
}
}
})
task.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func Sendmsg(username:String, password:String)
{
let post_data: NSDictionary = NSMutableDictionary()
post_data.setValue(username, forKey: "message")
post_data.setValue(password, forKey: "film_id")
let url:URL = URL(string: send_url)!
let session = URLSession.shared
let request = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.setValue("740c94c51891c02b64d6c78840b478fe0b02fe2c", forHTTPHeaderField: "X-API-KEY")
request.setValue("Basic YmhlZW0uZW5nckBnbWFpbC5jb206YmgzM20=", forHTTPHeaderField: "Authorization")
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
var paramString = ""
for (key, value) in post_data
{
paramString = paramString + (key as! String) + "=" + (value as! String) + "&"
}
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest, completionHandler: {
(
data, response, error) in
guard let _:Data = data, let _:URLResponse = response , error == nil else {
return
}
let json: Any?
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
print(json)
}
catch
{
return
}
guard let server_response = json as? NSDictionary else
{
return
}
// if let data_block = server_response["data"] as? NSDictionary
// {
// if let session_data = data_block["session"] as? String
// {
// self.login_session = session_data
//
// let preferences = UserDefaults.standard
// preferences.set(session_data, forKey: "session")
//
// DispatchQueue.main.async(execute: self.LoginDone)
// }
// }
//
})
task.resume()
}
答
在viewDidLoad()中，将{}捕获到{}附加到messageArray的位置，像这样调用messageView.reloadData():
In viewDidLoad(), the do {} catch {} where you append to messageArray, call the messageView.reloadData() like this:
do
{
json = try JSONSerialization.jsonObject(with: data!, options: [])
if let parsedData = json as? [[String:Any]] {
for dict in parsedData {
if let title = dict["message"] as? String {
self.messageArray.append(title)
print(json)
}
}
}
messageView.reloadData() // this is your tableView reload
}
catch
{
return
}
通常，人们将其UITableView对象称为tableView，以使其更容易发现代码.但是，没有人禁止您使用messageView作为tableView的名称.
Usually people will call their UITableView object as tableView, to make it easier to spot in the code. Nobody prohibit you to use messageView as the name of your tableView, though.