我有一个包含6个属性的User实体。
class User: NSManagedObject {
@NSManaged var activityLevel: String
@NSManaged var age: NSNumber
@NSManaged var gender: String
@NSManaged var goal: String
@NSManaged var height: NSNumber
@NSManaged var name: String
@NSManaged var weight: NSNumber
class func createInManagedObjectContext(moc: NSManagedObjectContext, name: String, age: Int, gender: String) -> User {
let newUser = NSEntityDescription.insertNewObjectForEntityForName("User", inManagedObjectContext: moc) as! User
newUser.name = name
newUser.age = age
newUser.gender = gender
return newUser
}
}
我想在一个VC中初始化其中三个（名称，年龄和性别），其余的在第二个VC中。
这是我的第一个视图控制器的样子。我有一个mainUser变量，我想通过prepareForSegue方法发送到第二个VC。我一直试图让这个工作，但没有尽头。这样做有什么标准做法吗？
另外......如果您需要，这是我的第一个VC：
class PersonalDataViewController: UIViewController {
var mainUser: User?
let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
// MARK: UI Elements
@IBOutlet weak var nameInputField: CustomUITextField!
@IBOutlet weak var ageInputField: CustomUITextField!
@IBOutlet weak var genderSelector: UISegmentedControl!
@IBOutlet weak var proceedButton: UIButton!
@IBAction func proceedButtonPressed(sender: AnyObject) {
}
func determineGender(control: UISegmentedControl) -> String {
var gender: String?
switch control.selectedSegmentIndex
{
case 0:
gender = "male"
case 1:
gender = "female"
default:
break;
}
return gender!
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "toFitnessData" {
var fitnessDataVC = segue.destinationViewController as! FitnessDataViewController
fitnessDataVC.currentUser = User.createInManagedObjectContext(
self.managedObjectContext!,
name: nameInputField.text,
age: ageInputField.text.toInt()!,
gender: determineGender(genderSelector)
)
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
这是第二个感兴趣的ViewController ......无法真正看出我的错误。
class FitnessDataViewController: UIViewController {
let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
@IBOutlet weak var greetingsLabel: UILabel!
@IBOutlet weak var weightInputField: UITextField!
@IBOutlet weak var heightInputField: UITextField!
@IBOutlet weak var activityLevelSelector: UISegmentedControl!
@IBOutlet weak var goalSelector: UISegmentedControl!
@IBAction func readyButtonPressed(sender: AnyObject) {
finishUserInitialization()
}
var currentUser: User?
func finishUserInitialization() {
if let user = currentUser as User! {
user.weight = weightInputField.text.toInt()!
user.height = heightInputField.text.toInt()!
user.activityLevel = determineActivityLevel(activityLevelSelector)
user.goal = determineGoal(goalSelector)
println(user)
}
}
func determineActivityLevel(selector: UISegmentedControl) -> String {
var activityLevel: String?
switch selector.selectedSegmentIndex {
case 0:
activityLevel = "sedetary"
case 1:
activityLevel = "light"
case 2:
activityLevel = "moderate"
case 3:
activityLevel = "veryActive"
case 4:
activityLevel = "extremelyActive"
default:
break;
}
return activityLevel!
}
func determineGoal(selector: UISegmentedControl) -> String {
var goal: String?
switch selector.selectedSegmentIndex {
case 0:
goal = "looseWeight"
case 1:
goal = "maintainWeight"
case 2:
goal = "gainWeight"
default:
break;
}
return goal!
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}