Question

这是我用来扩展和折叠标题部分的代码。试图只允许扩展一个部分。因此，当用户点击另一个部分时，它将首先折叠展开的部分，然后展开新部分。请分享我一次只能展开一个部分的信息。当我使用此代码时，它不像上面那样工作。它会打开多个部分，而不会关闭前面的部分。

func sectionHeaderTapped(_ gestureRecognizer: UITapGestureRecognizer) {
    let indexPath: IndexPath = IndexPath(row: 0, section: gestureRecognizer.view!.tag)

    if (indexPath as NSIndexPath).row == 0 {

        collapsed = CBool(arrayForBool[(indexPath as NSIndexPath).section] as! NSNumber)
        print("Collapsed: ",collapsed)

        for i in 0 ..< sortedListAry.count {

            if (indexPath as NSIndexPath).section == i {
                arrayForBool[i] = !collapsed
                print("arrayForBool: ",arrayForBool)
                if (arrayForBool[i] as! Bool) == true{                       
                    let abc = (self.subListAry.object(at: (indexPath as NSIndexPath).section) as AnyObject).value(forKey: "category_id") as! NSArray
                  if (abc.count == 0)
                    {
 //                        let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
//                            let viewController = mainStoryboard.instantiateViewController(withIdentifier: "SubCategory") as! subCat
//                            viewController.subCategoryID = ((self.sortedListAry.object(at:(indexPath as NSIndexPath).section) as AnyObject).value(forKey: "category_id") as? String)!

 //                           self.navigationController?.pushViewController(ViewController, animated: true)

                    }


                    else{

                        collapsed = true
                                categoryListTbl.reloadSections(IndexSet(integer: gestureRecognizer.view!.tag), with: .automatic)
                        categoryListTbl.scrollToRow(at: indexPath, at: .top, animated: true)

                    }
                }

               else{

                    collapsed = false
                    categoryListTbl.reloadSections(IndexSet(integer: gestureRecognizer.view!.tag), with: .automatic)

                    }
                }
            }
        }
    }

Answer 1

维护indexOfPreviouslyExpanded部分。为它开始分配-1。在您的方法中检查是否有一些以前扩展的部分。除了当前扩展的部分之外，您还需要重新加载indexOfPreviouslyExpanded的部分。每次选择一个部分时，还要确保更新indexOfPreviouslyExpanded。

Answer 2

试试这个： -

func sectionHeaderTapped(_ gestureRecognizer: UITapGestureRecognizer) {
     let indexPath: IndexPath = IndexPath(row: 0, section: 
gestureRecognizer.view!.tag)

    if (indexPath as NSIndexPath).row == 0 {

        collapsed = CBool(arrayForBool[(indexPath as NSIndexPath).section] as! NSNumber)
        print("Collapsed: ",collapsed)

        for i in 0 ..< sortedListAry.count {

            if (indexPath as NSIndexPath).section == i {
                arrayForBool[i] = !collapsed
                print("arrayForBool: ",arrayForBool)
                if (arrayForBool[i] as! Bool) == true{
                    let abc = (self.subListAry.object(at: (indexPath as NSIndexPath).section) as AnyObject).value(forKey: "category_id") as! NSArray
                    if (abc.count == 0)
                    {
                        //                        let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
                        //                            let viewController = mainStoryboard.instantiateViewController(withIdentifier: "SubCategory") as! subCat
                        //                            viewController.subCategoryID = ((self.sortedListAry.object(at:(indexPath as NSIndexPath).section) as AnyObject).value(forKey: "category_id") as? String)!

                        //                           self.navigationController?.pushViewController(ViewController, animated: true)

                    }


                    else{

                        collapsed = true
                        categoryListTbl.reloadSections(IndexSet(integer: gestureRecognizer.view!.tag), with: .automatic)
                        categoryListTbl.scrollToRow(at: indexPath, at: .top, animated: true)

                    }
                }

                else{

                    collapsed = false
                    categoryListTbl.reloadSections(IndexSet(integer: gestureRecognizer.view!.tag), with: .automatic)

                }
            }else {

                // here collapse all other section replace your bool array with value which you are using to collapse your section and reload tableview.

            }
        }
    }
}

}

使用Swift只允许在节标题中展开一个节

2 个答案: