我在我的项目中运行了两个tableView。我已经使用segue成功地将数据从我的第一个tableView传递到第二个tableView控制器。我正在尝试使用NSUserDefaults.Iy部分代码保存我传递给secondViewController的数据...
第一个VC:
npm
第二个VC:
var tableView: UITableView!
var DataArray = ["Bus","Helicopter","Truck","Boat","Bicycle","Motorcycle","Plane","Train","Car","S cooter","Caravan"]
var sendSelectedData = NSString()
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let indexPath = tableView.indexPathForSelectedRow!
let currentCell = tableView.cellForRow(at: indexPath) as UITableViewCell!
// print(indexPath)
// print(currentCell)
sendSelectedData = (currentCell!.textLabel?.text)! as String as NSString
performSegue(withIdentifier: "ShowDetails", sender: indexPath)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let selectedIndex = sender as! NSIndexPath
let currentCell = tableView.cellForRow(at: selectedIndex as IndexPath)!
self.sendSelectedData = (currentCell.textLabel?.text)! as String as NSString
if segue.identifier == "ShowDetails" {
let viewController = segue.destination as! SecondController
viewController.newItem = (self.sendSelectedData as String)
}
}
我正在关注https://grokswift.com/uitableview-updates/文章以实现这项功能......
先谢谢。
答案 0 :(得分:1)
在AppDelegate
applicationDidFinishLaunching
中注册一个空数组作为键" NewArray"的默认值。
let defaultValues = ["NewArray": [String]()]
UserDefaults.standard.register(defaults: defaultValues)
在第二个VC 中定义newArray
(变量名称应以小写字母开头)也为空String
数组
var newArray = [String]()
在viewDidLoad
中从用户默认值中检索数组,追加新项目,将数组保存回用户默认值并重新加载表格视图
override func viewDidLoad() {
super.viewDidLoad()
let defaults = UserDefaults.standard
newArray = defaults.array(forKey: "NewArray") as! [String]
newArray.append(newItem)
defaults.set(newArray, forKey: "NewArray")
self.tableView?.reloadData()
}
根本不需要{p> beginUpdates()
,endUpdates()
和insertRowsAtIndexPath / reloadRowsAtIndexPaths
。