Question

我创建了一个简单的动画，显示出一枚硬币在跳动，并且效果很好，直到在故事板上带有动画的那个之前添加了viewcontroller。

我希望在显示带有此动画的屏幕之前在游戏中拥有菜单屏幕。

这是动画的代码：

let imageView: UIImageView = coinImageView[0]

UIView.animate(withDuration: 0.5, 
                delay: 0.1, 
                options: [
                    .repeat, 
                    .autoreverse, 
                    .curveEaseIn, 
                    .allowUserInteraction
                ], 
                animations: { 
                    imageView.transform = CGAffineTransform(scaleX: 1.5, y: 1.5) 
                }
)

第一个视图（带有菜单）如下：

class MenuViewController: UIViewController {

        @IBAction func newGameButton(_ sender: Any) {
            let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ViewController") as! ViewController
            self.present(viewController, animated: true, completion: nil)
            viewController.newGame()
        }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

和第二个viewcontroller（带有动画的一个）如下：

    class ViewController: UIViewController, SavingViewControllerDelegate, UICollectionViewDelegate, UICollectionViewDataSource {
        var coinImageView: [UIImageView] = []

func grantCoins(n: Int) {
        let coinCount = coin.count
        for i in coinCount...(coinCount+n) {
            coin.append(UIImage(named: "coin.png")!)
            coinImageView.append(UIImageView(image: coin[i]))
            coinImageView[i].isUserInteractionEnabled = true
            coinImageView[i].addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.handlePan(_:))))
            coinImageView[i].frame = CGRect(x: 147, y: -100, width: 60, height: 60)
            view.addSubview(coinImageView[i])
            
            let finalPoint = CGPoint(
                 x: 177,
                 y: 278
               )
            generateNewCoin(gestureView: coinImageView[i])
        }
        view.bringSubviewToFront(coinImageView[0])
    }
    
        func newGame() { 
            animateFirstCoin()
        }
    
        func animateFirstCoin() {
            let imageView: UIImageView = coinImageView[0]
    
            UIView.animate( 
                withDuration: 0.5,
                delay: 0.1,
                options: [.repeat, .autoreverse, .curveEaseIn, .allowUserInteraction],
                animations: {
                    imageView.transform = CGAffineTransform(scaleX: 1.5, y: 1.5)
            })
        }
    }

这个问题有明显的解释吗？

Answer 1

经过一天没有成果的研究，我终于找到了它。生成第一个硬币时，该视图尚不可见，因此动画无法正常工作。另一批硬币动画效果很好。我只是将此代码放在函数中以进行检查：

if (view.window == nil) {
    print("view is not visible")
} else {
    print("view is visible")
}

谢谢

uiview.animate在情节提要中添加第二个viewcontroller时停止工作

1 个答案: