首页 > 解决方案 > UITableView 重新加载不使用 DispatchQueue.main.async 更新 tableview

问题描述

我已经用 swift4 编写了代码并在 iPhone 模拟器上运行。

DispatchQueue.main.async {
     self.view.activityindicatorStop()
     self.mytableView.reloadData()
}

上面的代码有以下操作

TableView用数组填充数据后停止活动指示器并更新..

但预期不会发生..

我得到了关注

  1. 活动指示器停止但指示器未移除且背景视图未移除。
  2. TableView未更新。

我用过的代码:

 super.viewDidLoad()


        UserDefaults.lastAccessDate = Date()


        self.view.activityStartAnimating(activityColor: #colorLiteral(red: 0.9176470588, green: 0.2901960784, blue: 0.262745098, alpha: 1), backgroundColor: #colorLiteral(red: 1, green: 1, blue: 1, alpha: 0))

       //Calling the API  
      Capsulle.retriveSpaceTimeCapsulle { (data, respose, error) in
        if nil == error
        {
         let ServerData = serverComm.toJSONObject(with: data!)
         let result = ServerData.0 as? Array<Dictionary<String, Any>>
         self.capsulleDetail = result

        if (result == nil)
        {
            if false ==  loginCredential.isHavingAccessToken
            {
            loginCredential.isHavingAccessToken = false;
            UserDefaults.standard.set( "", forKey: "UserEmailID")
            let objStoryBoard:UIStoryboard = UIStoryboard.init(name: "Main", bundle: nil)
            let initialViewController:UIViewController = objStoryBoard.instantiateViewController(withIdentifier: "loginVC")

            self.present(initialViewController, animated: true, completion: {

            })

            return
            }
        }


         DispatchQueue.main.sync {

            self.CapsulleCollectionView.reloadData()

            self.view.activityStopAnimating()

         }
         }

      }

    }

func activityStartAnimating(activityColor: UIColor, backgroundColor: UIColor) {
        let backgroundView = UIView()
        backgroundView.frame = CGRect.init(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height)
        backgroundView.backgroundColor = backgroundColor
        backgroundView.tag = 475647

        var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
        activityIndicator = UIActivityIndicatorView(frame: CGRect.init(x: 0, y: 0, width: 50, height: 50))
        activityIndicator.center = self.center
        activityIndicator.hidesWhenStopped = true
        activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
        activityIndicator.color = activityColor
        activityIndicator.startAnimating()
        self.isUserInteractionEnabled = false

        backgroundView.addSubview(activityIndicator)

        self.addSubview(backgroundView)
    }

func activityStopAnimating() {
    if let background = self.viewWithTag(475647){

        background.removeFromSuperview()
    }
    self.isUserInteractionEnabled = true
}

我创建了 activityStopAnimating 和 activityStartAnimating 作为扩展

标签: iosswiftxcodeuitableviewgrand-central-dispatch

解决方案


要重新加载 tableView,如果此数组是您的数据源,您必须确保self.capsulleDetail 数据已更改,我认为它没有更改或仍然为零,因此 reloadData() 将什么也不做

要隐藏指标,您应该设置此属性以在停止时隐藏它或通过将 is-hidden 设置为 true 直接隐藏它

self.activityIndicator.hidesWhenStopped = true

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