ios - MBProgressHUD需要在主线程上访问

Question

我在使用 MBProgessHUD 时收到此错误。我试图显示一个加载指示器，然后我的应用程序正在从 Api 加载数据并停止，然后数据显示在屏幕上。

func getJson(){ 
        let spinningWheel = MBProgressHUD.showAdded(to: self.view, animated: true)
        spinningWheel.label.text = "Loading"
        spinningWheel.detailsLabel.text = "Please wait a moment.."
.
. 
.
.
.
.
. 
DispatchQueue.main.async {
                    self.movieName.isHidden = false
                    self.movieName.text = self.movieNameLabel
                    self.movieDescription.text = self.movieDescriptionLabel
                    self.movieImage.downloadedFrom(url: url2!)
                    spinningWheel.hide(animated: true)
                }

Answer 1

在 iOS 中，所有 UIKit 方法调用都必须在主线程上进行。将所有 UIkit 用法包含在 DispatchQueue.main.(a)sync 调用中，如下所示:

func getJson() {
  DispatchQueue.main.async {
    let spinningWheel = MBProgressHUD.showAdded(to: self.view, animated: true)
    spinningWheel.label.text = "Loading"
    spinningWheel.detailsLabel.text = "Please wait a moment.."
  }
  // actually get JSON
}