用户默认设置不起作用
Userdefaults not working
谁能帮我解释一下为什么我不能正确执行 nsuserdefaults。当我尝试点击保存时,它什么都不做。我想要的是当我点击保存时它会保存到 phone 然后当我再次尝试返回到 viewcontroller 时它会出现。下面是我的代码。
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.setHidesBackButton(true, animated: false)
self.hideKeyboardWhenTappedAround()
firstName.delegate = self
lastName.delegate = self
tableView.reloadData()
//Save Defaults
let defaults = UserDefaults.standard
if let _ = defaults.object(forKey: "firstName") as? String {
self.firstName.text = defaults.object(forKey: "firstName") as? String
}
if let _ = defaults.object(forKey: "lastName") as? String {
self.lastName.text = defaults.object(forKey: "lastName") as? String
}
if let _ = defaults.object(forKey: "contacts") as? Array<Any> {
self.contacts = (defaults.object(forKey: "contacts") as? Array)!
}
}
//MARK -> SAVE BUTTON
@IBAction func saveButtonSelected(_ sender: AnyObject) {
let defaults: UserDefaults = UserDefaults.standard
defaults.set(self.firstName.text, forKey: "firstName")
defaults.set(self.lastName.text, forKey: "lastName")
defaults.set(contacts, forKey: "contacts")
}
试试这个:
@IBAction func saveButtonSelected(_ sender: AnyObject) {
let defaults: UserDefaults = UserDefaults.standard
defaults.set(self.firstName.text, forKey: "firstName")
defaults.set(self.lastName.text, forKey: "lastName")
defaults.set(contacts, forKey: "contacts")
defaults.synchronize()
}
谁能帮我解释一下为什么我不能正确执行 nsuserdefaults。当我尝试点击保存时,它什么都不做。我想要的是当我点击保存时它会保存到 phone 然后当我再次尝试返回到 viewcontroller 时它会出现。下面是我的代码。
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.setHidesBackButton(true, animated: false)
self.hideKeyboardWhenTappedAround()
firstName.delegate = self
lastName.delegate = self
tableView.reloadData()
//Save Defaults
let defaults = UserDefaults.standard
if let _ = defaults.object(forKey: "firstName") as? String {
self.firstName.text = defaults.object(forKey: "firstName") as? String
}
if let _ = defaults.object(forKey: "lastName") as? String {
self.lastName.text = defaults.object(forKey: "lastName") as? String
}
if let _ = defaults.object(forKey: "contacts") as? Array<Any> {
self.contacts = (defaults.object(forKey: "contacts") as? Array)!
}
}
//MARK -> SAVE BUTTON
@IBAction func saveButtonSelected(_ sender: AnyObject) {
let defaults: UserDefaults = UserDefaults.standard
defaults.set(self.firstName.text, forKey: "firstName")
defaults.set(self.lastName.text, forKey: "lastName")
defaults.set(contacts, forKey: "contacts")
}
试试这个:
@IBAction func saveButtonSelected(_ sender: AnyObject) {
let defaults: UserDefaults = UserDefaults.standard
defaults.set(self.firstName.text, forKey: "firstName")
defaults.set(self.lastName.text, forKey: "lastName")
defaults.set(contacts, forKey: "contacts")
defaults.synchronize()
}