Xcode UIView.init(frame:) must be used from main thread only

Question

I\'m trying to render some views in background thread to not affect the main thread. That was never a problem before Xcode 9.

DispatchQueue.global(qos: .back         


        

Answer 1

You can use this function

func downloadImage(urlstr: String, imageView: UIImageView) {
    let url = URL(string: urlstr)!
    let task = URLSession.shared.dataTask(with: url) { data, _, _ in
        guard let data = data else { return }
        DispatchQueue.main.async { // Make sure you're on the main thread here
            imageview.image = UIImage(data: data)
        }
    }
    task.resume()
}

How to use this function?

downloadImage(urlstr: "imageUrl", imageView: self.myImageView)