Question

如何在ios程序开发中正确使用activity indicator

Answer 1

class ViewController: UIViewController {
@IBOutlet weak var imageView: UIImageView!
@IBOutlet weak var activityIndicator: UIActivityIndicatorView!
@IBAction func clickButton(_ sender: UIButton) {
imageView.image = nil
activityIndicator.startAnimating()
sleep(5)
activityIndicator.stopAnimating()
imageView.image = UIImage(named: "cat")
}
}