I Found Error of Could Not Cast Value of Type when i load my json in Tableview - swift3

Question

This is my code , could not append array type to UIImage , api is successfully loaded , i have problem in appending data
var images = UIImage
func downloadJsonWithURL() {
let url = NSURL(string: urlString)
URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {(data, response, error) -> Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSObject {
print(jsonObj!.value(forKey: "guid"))
if let actorArray = jsonObj!.value(forKey: "guid") as? [NSObject] {
if let actorDict = actorArray as? NSObject
{
if let name = actorDict.value(forKey: "rendered") {
**self.images.append(name as! UIImage)**
print("\(name)")
}
}
}
OperationQueue.main.addOperation({
self.tableView.reloadData()
})
}
}).resume()
}
this is my rest api
guid {1}
rendered : http://thenewschef.com/wp-content/uploads/2018/02/startup.jpeg

Answer 1

So, You Can Do This
var images = [[String:AnyObject]]()
override func viewDidLoad() {
super.viewDidLoad()
downloadJsonWithURL()
}
//Tableview methods
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return images.count
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{
return 135
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "DemoTableCell", for: indexPath) as! DemoTableCell
let dict = images[indexPath.row]
URLSession.shared.dataTask(with: NSURL(string: dict["rendered"] as! String)! as URL, completionHandler: { (data, response, error) -> Void in
if error != nil {
print(error as Any)
return
}
DispatchQueue.main.async(execute: { () -> Void in
let image = UIImage(data: data!)
cell.imgView?.image = image
})
}).resume()
return cell
}
//your api call
func downloadJsonWithURL() {
let urlString = "https://thenewschef.com/wp-json/wp/v2/media"
let url = NSURL(string: urlString)
print(url as Any)
URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {(data, response, error) -> Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) {
print((jsonObj as AnyObject).value(forKey: "guid") as Any)
let responseJSON = (jsonObj as AnyObject).value(forKey: "guid") as Any
let json = (responseJSON as AnyObject) as? NSArray
self.images = json as! [[String:AnyObject]]
print(self.images)
OperationQueue.main.addOperation({
self.demoTable.reloadData()
})
}
}).resume()
}
That's it you got your UIImage.

Answer 2

Enhanced implementation of above solution using Higher order function to avoid all the cast dance.
Use the below code to fetch the response form Server & filter the required imageUrl's in a single array.
func downloadJsonWithURL() {
let urlString = "https://thenewschef.com/wp-json/wp/v2/media"
let url = NSURL(string: urlString)
URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {[weak self] (data, response, error) -> Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) {
let guids = (jsonObj as? [[String: Any]])?.map { $0["guid"] }
let imagesArray = (guids as? [[String: Any]])?.map {$0["rendered"]} as? [String]
OperationQueue.main.addOperation({
//Reload Table here...
})
}
}).resume()
}