在UIPickerView中使用来自NSUserDefaults的数据 – pickerView保持为空

我试图设置NSUserDefaults昨晚，但一直在发生错误：

ViewController3：

保存数据

@IBAction func tappedAddButton(sender: AnyObject) { var userDefaults:NSUserDefaults = NSUserDefaults.standardUserDefaults() var exercisesList:NSMutableArray? = userDefaults.objectForKey("exercisesList") as? NSMutableArray var dataSet:NSMutableDictionary = NSMutableDictionary() dataSet.setObject(textField.text, forKey: "exercises") if ((exercisesList) != nil){ var newMutableList:NSMutableArray = NSMutableArray(); for dict:AnyObject in exercisesList!{ newMutableList.addObject(dict as NSDictionary) } userDefaults.removeObjectForKey("exercisesList") newMutableList.addObject(dataSet) userDefaults.setObject(newMutableList, forKey: "exercisesList") }else{ userDefaults.removeObjectForKey("exercisesList") exercisesList = NSMutableArray() exercisesList!.addObject(dataSet) userDefaults.setObject(exercisesList, forKey: "exercisesList") } userDefaults.synchronize() self.view.endEditing(true) textField.text = "" } 

ViewController1：

加载数据

  var exercises:NSMutableArray = NSMutableArray(); 

…

  override func viewDidAppear(animated: Bool) { var userDefaults:NSUserDefaults = NSUserDefaults.standardUserDefaults() var exercisesListFromUserDefaults:NSMutableArray? = userDefaults.objectForKey("exercisesList") as? NSMutableArray if ((exercisesListFromUserDefaults) != nil){ exercises = exercisesListFromUserDefaults! } } 

在添加一些数据到variables“练习”时，pickerView保持空白。

Answer 1

您正在使用键“exerciseList”设置userDefaults，但试图用不同的键（“itemList”）返回数据