Swift xcode错误：类型'DetailViewController'的值没有成员'Animal'

Question

我想用动物列表做一个swift项目，然后当你点击其中一行时，你会被运送到另一个窗口它告诉你动物的描述。

这里是代码，如果截图太小：

import UIKit 


class DetailViewController: UIViewController 
{ 
    @IBOutlet weak var titleLabel: UILabel! 
    @IBOutlet weak var descriptionLabel: UILabel! 
    var animal: Animal? 
    var a = Animal?() 


    override func viewWillAppear(animated: Bool) 
    { 
     titleLabel.text = a!.name 
     descriptionLabel.text = a!.longDescription 
    } 



    override func viewDidLoad() 
    { 
     viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func didReceiveMemoryWarning() 
    { 
     didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 



} 

ListOfAnimals类代码：

import Foundation 


let animals = [ 
    ListOfAnimals(name: "Cow", 
     shortDescription: "Cattle", 
     longDescription: "A cow is a mature female and bull of an adult male of a bovine family. A heifer is a female cow that hasn't had a calf yet. Cattle is the name for the whole cow family. THere are about 920 different breeds of cows in the world."), 

    ListOfAnimals(name: "Bird", 
     shortDescription: "Usually small, has wings, feathers, and can fly.", 
     longDescription: "A warm-blooded egg-laying vertebrate distinguished by the possession of feathers, wings, and a beak and (typically) by being able to fly."), 

    ListOfAnimals(name: "Dolphin", 
     shortDescription: "A large fish", 
     longDescription: "A small gregarious toothed whale that typically has a beaklike snout and a curved fin on the back. Dolphins have become well known for their sociable nature and high intelligence."), 

    ListOfAnimals(name: "Dog", 
     shortDescription: "Man's best friend", 
     longDescription: "A domesticated carnivorous mammal that typically has a long snout, an acute sense of smell, and a barking, howling, or whining voice. It is widely kept as a pet or for work or field sports."), 

    ListOfAnimals(name: "Zebra", 
     shortDescription: "A horse with white and black stripes", 
     longDescription: "an African wild horse with black-and-white stripes and an erect mane."), 

] 

class ListOfAnimals 
{ 


    var name: String 
    //var type: Type 
    var shortDescription: String 
    var longDescription: String 

    init(name: String, shortDescription: String, longDescription: String) 
    { 
     self.name = name 
     self.shortDescription = shortDescription 
     self.longDescription = longDescription 
    } 

} 

Answer 1

import UIKit 
class AnimalListTableViewController: UITableViewController 
{ 
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return 4 
    } 

    override func prepareForSegue(segue: UIStoryboardSegue, 
     sender: AnyObject?) 
    { 
     if let detailViewController = segue.destinationViewController as? DetailViewController, let indexPath = self.tableView.indexPathForSelectedRow { 
      detailViewController.Animal = animals[indexPath.row] //this is where I get the error that says "Value of type 'DetailViewController' has no member 'Animal" 
     } 
    } 
} 

代码DetailViewController类

用途：

detailViewController.animal 

相反的：

detailViewController.Animal