Swift5 Extra argument 'completionHandler' in call error with session.dataTask

Question

I am trying to make a some weather app but there is some problem The error is "Extra argument 'completionHandler' in call" what should i do for solve it ?? enter image description here

    import Foundation
    
    struct WeatherManager {
        let weatherURL = "http://api.openweathermap.org/data/2.5/weather?APPID=sdfkjskfjsfjskflskflsjklfjf&units=metric"
        
        func fetchWeather(cityName: String) {
           let urlStirng = "\(weatherURL)&q=\(cityName)"
            performRequest(urlString: urlStirng)
        }
        
        func performRequest(urlString: String) {
            //1. Create a URL
            if let url = URL(string: urlString) {
                
                //2. Create a URL Session
                let session = URLSession(configuration: .default)
                
                //3. Give the session a task
                let task = session.dataTask(with: url, completionHandler: handle(data:response:error:))
                
                //4. Start the task
                task.resume()
                
            }
        }
        
        func handle(data: Data?, response: URLSession?, error: Error?) {
            
        }
        
    }

Answer 1

Check the following code:

func performRequest(urlString: String) {

    //1. Create a URL
    if let url = URL(string: urlString) {
        
        //2. Create a URL Session
        let session = URLSession(configuration: .default)
        
        //3. Give the session a task
        let task = session.dataTask(with: url, completionHandler: handle)
        
        //4. Start the task
        task.resume()
    }
}

func handle(data: Data?, response: URLResponse?, error: Error?) {

}

For response you need to pass an URLResponse instead of an URLSession to handle and you don't have to write the parameter names, because you are passing your handle function as an argument to dataTask.