图像不会动画

Question

我一直在尝试通过使用基于图像的动画来获取一些骰子图像进行动画处理，并在骰子显示随机图像之前在骰子上显示多个不同数字的图像。下面是ViewController代码：

import UIKit 
import Foundation 

class ViewController: UIViewController { 

    // Links to the image views 
    @IBOutlet weak var dieImage0: UIImageView! 
    @IBOutlet weak var dieImage1: UIImageView! 
    @IBOutlet weak var dieImage2: UIImageView! 
    @IBOutlet weak var dieImage3: UIImageView! 
    @IBOutlet weak var dieImage4: UIImageView! 
    @IBOutlet weak var dieImage5: UIImageView! 
    @IBOutlet weak var dieImage6: UIImageView! 
    @IBOutlet weak var dieImage7: UIImageView! 

    // Setting the RandomImages function to a constant 
    let randomImages = RandomImages() 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     // Array of animation images 
     var animationImages:[UIImage] = [ 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")!, 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")!, 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")!, 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")! 
     ] 

     // Animation duration and repeat count 
     var animationDuration: NSTimeInterval = 1.0 
     var animationRepeatCount: Int = 1 


    } 

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

    // Motion to roll dice 
    override func motionBegan(motion: UIEventSubtype, withEvent event: UIEvent) { 
     println("Motion Began") 

    } 

    override func motionEnded(motion: UIEventSubtype, withEvent event: UIEvent) { 

     // Trying to get one of the dice to roll 
     self.dieImage0.startAnimating() 

     dieImage0.image = randomImages.randomDice(); 
     dieImage1.image = randomImages.randomDice(); 
     dieImage2.image = randomImages.randomDice(); 
     dieImage3.image = randomImages.randomDice(); 
     dieImage4.image = randomImages.randomDice(); 
     dieImage5.image = randomImages.randomDice(); 
     dieImage6.image = randomImages.randomDice(); 
     dieImage7.image = randomImages.randomDice(); 

     println("Motion Ended") 
    } 

    override func motionCancelled(motion: UIEventSubtype, withEvent event: UIEvent) { 
     println("Motion Cancelled") 
    } 


} 

而对于RandomImages文件的代码：

import Foundation 
import UIKit 

struct RandomImages { 

    var diceImages:[UIImage] = [ 
     UIImage(named: "dicey-die1")!, 
     UIImage(named: "dicey-die2")!, 
     UIImage(named: "dicey-die3")!, 
     UIImage(named: "dicey-die4")!, 
     UIImage(named: "dicey-die5")!, 
     UIImage(named: "dicey-die6")! 
    ] 

    func randomDice() -> UIImage { 
     var unsignedArrayCount = UInt32(diceImages.count) 
     var unsignedRandomNumber = arc4random_uniform(unsignedArrayCount) 
     var randomNumber = Int(unsignedRandomNumber) 

     return diceImages[randomNumber] 
    } 

} 

如何遵循DRY主任何帮助，也想。

Answer 1

你的代码没什么意义。您正在您的视图控制器上创建名为animationImages，animationDuration和animationRepeatCount的变量。那什么都不做。

您需要在UIImageView上设置这些属性。假设dieImage0是在您的视图控制器迷上了作为出口的UIImageView，代码可能是这样的：

func animateDieImage0 
{ 
    dieImage0.animationImages = [ 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")!, 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")!, 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")!, 
      UIImage(named: "dicey-die1")!, 
      UIImage(named: "dicey-die2")!, 
      UIImage(named: "dicey-die3")!, 
      UIImage(named: "dicey-die4")!, 
      UIImage(named: "dicey-die5")!, 
      UIImage(named: "dicey-die6")! 
     ] 
    dieImage0.animationDuration = 1.0 
    dieImage0.animationRepeatCount = 1 
    dieImage0.startAnimating() 
} 

顺便说一下，重复同样的6幅多次是错误的方式，使动画重复。 （这是巨大的内存浪费。）这就是repeatCount的用处。