快速选择节标题会更改背景颜色

如何解决快速选择节标题会更改背景颜色

我知道我有时会问这个问题，但我的栏目标题仍然有问题。一旦页面进入视图，表视图中特定部分的标题应为蓝色，而其他页面为白色。我已经将特定区域放入数组中。我的问题是页面进入视图后，我看不到蓝色标题，但是如果我单击这些特定项目，则它们将变为相应的颜色。请检查以下附件。

   override func viewDidLoad() {
    super.viewDidLoad()
  
    getAllSchedule()


}

 override func viewWillAppear(_ animated: Bool) {
    getAllSchedule()
 
 
}

  func getAllLessonsOfTeacher() {
    objSchedule.getSchedule(param:"api/schedule/\(Userviewmodel.Shared().getUserId())/schedule") { (status) in
        self.tblVew.reloadData()

    }
}

我知道问题出在这里，但是我真的不知道缺少什么

  func tableView(_ tableView: UITableView,viewForHeaderInSection section: Int) -> UIView? {
    if(tableView == hrsTblVew){
        return nil
    }
    else{
      
    let headerView = UIView(frame: CGRect(x: 0,y: 0,width: tableView.frame.width-40,height: 40))
    
    let imgView = UIImageView(frame: CGRect(x: 10,y: 10,width: 20,height: 20))
 
    if(selectedSection == section){
        imgView.image = #imageLiteral(resourceName: "uparrow")
    }else{
        imgView.image = #imageLiteral(resourceName: "dropdown")
    }
    headerView.addSubview(imgView)
        print(bookedSection)
        print("array")
        print(bookedLessArr)
        
        if( bookedLessArr.contains(section)){
                           
            headerView.backgroundColor = #colorLiteral(red: 0.2392156869,green: 0.6745098233,blue: 0.9686274529,alpha: 1)
        
                       }
            else{
                           
            headerView.backgroundColor = #colorLiteral(red: 1,green: 1,blue: 1,alpha: 1)
            
            }
            
        
    
    let lbl = UILabel(frame: CGRect(x: 40,width: tableView.frame.width-50,height: 40))
    
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    dateFormatter.locale = Locale(identifier: "en_US_POSIX")
    if let date = dateFormatter.date(from: objSchedule.getDateString(index: section)){
        
        
        dateFormatter.dateFormat = "EEEE,dd-MM-yyyy"
        
        let dayStr = dateFormatter.string(from: date)
        lbl.text = Utility.shared().getCurrentDay(str:dayStr,currentLang:UserDefaults.standard.object(forKey:"language")as?String ?? "pl-PL")
        
    }
    
    
    lbl.textColor = UIColor.darkGray
    lbl.font = UIFont(name:"Montserrat-SemiBold",size: 16)
    headerView.addSubview(lbl)
    
    
    let btn = UIButton(frame: CGRect(x: 0,width: tableView.frame.width,height: 40))
    btn.addTarget(self,action: #selector(headerTapped(sender:)),for: .touchUpInside)
    btn.tag = section + 1
    headerView.addSubview(btn)
        
        
        
    
    return headerView
    }
}