Swift UserDefault 存储数组数据加载到 UICollectionView

问题描述

在我的场景中，我将存储数组数据到VC2中的UserDefault中.在另一个 VC1 中，我正在 retrieving 数据.现在，我需要将数据加载到 VC1 中的 collectionview 数组中.在这里，我使用多个数据源而不是想要使用单个数据源来获取要加载到 collectionview 的特定值.如何实现这一目标?

In my scenario, I am storing array data into UserDefault in VC2. In another VC1 I am retrieving data. Now, I need to load data into collectionview array in VC1. Here, I am using multiple datasource Instead of that want to use single data source to get a specific values to load into collectionview. How to achieve this?

注意:在关闭 VC2 时，我需要将数组值传递给 VC1

NOTE: while dismissing VC2 I need to pass the array value to VC1

数组数据存储到 VC2 中的 UserDefault

let selectedData = membersData.filter{$0.isSelected}
UserDefaults.standard.set(try? PropertyListEncoder().encode(selectedData), forKey:"sessiondata")

在 VC1 中检索存储数据

    func storeValidaion(){
         // Retrive Array Values
          if let data = UserDefaults.standard.value(forKey:"sessiondata") as? Data {
               let sessionData = try? PropertyListDecoder().decode(Array<TeamListData>.self, from: data)
               print("ARRAY VALUES: \(sessionData!)")

          // here how to load array data into collection view

   if sessionData?.isEmpty == false {
            for person in sessionData! {
                print(person.userid!)

                if useridArray.contains(person.userid!) {
                    print("yes")
                } else {
                    self.useridArray.append(person.userid!)
                    self.nameArray.append(person.firstname!)
                    self.profileArray.append(person.profileimage!)
                    print(useridArray)
                    print(profileArray)
                }
                self.collectionView.reloadData()
            }
        } else {
            UserDefaults.standard.removeObject(forKey:"sessiondata")
            self.useridArray.removeAll()
            self.profileArray.removeAll()
            self.nameArray.removeAll()
            self.collectionView.reloadData()
        }
    }
    }

/*ARRAY VALUES: [ListData(userid: Optional("1"), firstname: Optional("abc"), designation: Optional("student"), profileimage: Optional("url"), isSelected: false), ListData(userid: Optional("2"), firstname: Optional("def"), designation: Optional("Executive"), profileimage: Optional("url"), isSelected: false)]*/

推荐答案

下面是VC2里面的代码

Below code inside VC2

数组数据存储到 VC2 中的 UserDefault

let selectedData = membersData.filter{$0.isSelected}
UserDefaults.standard.set(try? PropertyListEncoder().encode(selectedData), forKey:"sessiondata")

采用 VC2Delegate

adopt VC2Delegate

func dismissProtocole(data: Any) {
        <#code#>
    }

在 VC1 中显示 VC2

if let details = self.storyboard?.instantiateViewController(withIdentifier: "VC2") as?VC2 {
            details.modalPresentationStyle = .fullScreen
             details.modalTransitionStyle = .crossDissolve
            **details.selectedData = selectedData** // pass data
             details.delegate = self
            self.navigationController?.present(details, animated: true, completion: nil)
        }

VC2 内部

var selectedData : [TeamListData]?//实例方法var 委托:VC2Delegate?

var selectedData : [TeamListData]? // instance method var delegate : VC2Delegate?

在 VC2 中检索存储数据

func storeValidaion(){
        // Retrive Array Values
        if selectedData == nil  {
            if let data = UserDefaults.standard.value(forKey:"sessiondata") as? Data {
                guard let sessionData = try? PropertyListDecoder().decode(Array<TeamListData>.self, from: data) else {
                    return
                }

                print("ARRAY VALUES: \(sessionData)")
                self.selectedData = sessionData
                self.collectionView.reloadData()
                // put your code whatever you want....
            }
        }

    }

解除方法

func dismiss() {
    self.delegate?.dismissProtocole(data: sessionData)
}

协议声明

protocol VC2Delegate {
    func dismissProtocole( data : Any)
}

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