swift error: Value of type _ has no member _

Question

how do I fix this error? xcodes-13

这是我使用 api 的代码：

struct everything: Codable{
        let topic: String
        let content: String
        let category: String
        let time: String
        let price: String
        let prize: String
    }    
    struct parsingss : Codable {
        let scrims: [everything]
    }
    
    @IBOutlet weak var prizeLabel: UILabel!
    @IBOutlet weak var priceLabel: UILabel!
    @IBOutlet weak var timeLabel: UILabel!
    @IBOutlet weak var categoryLabel: UILabel!
    @IBOutlet weak var ContentLabel: UILabel!
    @IBOutlet weak var TopicLabel: UILabel!
    

    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let url = URL(string: "http://{Local-Host}/post") {
           URLSession.shared.dataTask(with: url) { data, response, error in
        if let data = data {
            let jsonDecoder = JSONDecoder()
            do {
            let parsedJSON = try jsonDecoder.decode(parsingss.self, from: data)
                
                print(parsedJSON)
                
                DispatchQueue.main.async {

                    self.TopicLabel.text = parsedJSON.topic
                    self.ContentLabel.text = parsedJSON.content
                    self.categoryLabel.text = parsedJSON.category
                    self.timeLabel.text = parsedJSON.time
                    self.priceLabel.text = parsedJSON.price
                    self.prizeLabel.text = parsedJSON.prize
                    
                   }
                    }
            catch {
            print(error)
                        
                    }
                   }
               }.resume()
            }
    }
}

"error : Value of type 'testViewController.parsingss' has no member 'topic'"

回复一些代码会更好。感谢开发者。

没有“尝试在标签中打印”，结果确实会输出。它在一个数组中：

[ scrims: {
        "topic": "tv",
        "content": "done",
        "category": "gg",
        "time": "10pm",
        "price": "Rs.100",
        "prize": "Rs.1000",
        "id": 1
    },
    {
        "topic": "1",
        "content": "d1",
        "category": "g1",
        "time": "10pm",
        "price": "Rs.11",
        "prize": "R1",
        "id": 2
    } ]

谢谢！

Answer 1

您试图在未指定索引的情况下从数组对象分配下标值。

试试这个：

class ViewController: UIViewController {
@IBOutlet weak var prizeLabel: UILabel!
@IBOutlet weak var priceLabel: UILabel!
@IBOutlet weak var timeLabel: UILabel!
@IBOutlet weak var categoryLabel: UILabel!
@IBOutlet weak var ContentLabel: UILabel!
@IBOutlet weak var TopicLabel: UILabel!


override func viewDidLoad() {
    super.viewDidLoad()
    
    if let url = URL(string: "http://{Local-Host}/post") {
        URLSession.shared.dataTask(with: url) { data, response, error in
            if let data = data {
                do {
                    let parsedJSON = try JSONDecoder().decode(parsingss.self, from: data)
                    
                    print(parsedJSON)
                    
                    DispatchQueue.main.async {
                        self.TopicLabel.text = parsedJSON.scrims[0].topic
                        self.ContentLabel.text = parsedJSON.scrims[0].content
                        self.categoryLabel.text = parsedJSON.scrims[0].category
                        self.timeLabel.text = parsedJSON.scrims[0].time
                        self.priceLabel.text = parsedJSON.scrims[0].price
                        self.prizeLabel.text = parsedJSON.scrims[0].prize
                    }
                }
                catch {
                    print(error)
                    
                }
            }
        }.resume()
    }
}

}

swift error: Value of type _ has no member _

swift error: Value of type _ has no member _

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