UICollectionViewCell Shake

Question

我创建了一个UICollectionView，并希望所有单元格像iPhone上跳板的编辑模式一样摇晃。我创建了摇动代码，但不知道如何实现它。我有自定义单元格所以我认为它进入那里但不知道它是如何实现的。谢谢。

#define degreesToRadians(x) (M_PI * (x) / 180.0)
#define kAnimationRotateDeg 0.5
#define kAnimationTranslateX 1.0
#define kAnimationTranslateY 1.0

//startJiggling

int count = 1;
CGAffineTransform leftWobble = CGAffineTransformMakeRotation(degreesToRadians( kAnimationRotateDeg * (count%2 ? +1 : -1 ) ));
CGAffineTransform rightWobble = CGAffineTransformMakeRotation(degreesToRadians( kAnimationRotateDeg * (count%2 ? -1 : +1 ) ));
CGAffineTransform moveTransform = CGAffineTransformTranslate(rightWobble, -kAnimationTranslateX, -kAnimationTranslateY);
CGAffineTransform conCatTransform = CGAffineTransformConcat(rightWobble, moveTransform);

    self.transform = leftWobble;  // starting point

    [UIView animateWithDuration:0.1
                          delay:(count * 0.08)
                        options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse
                     animations:^{ self.transform = conCatTransform; }
                     completion:nil];

Answer 1

如果您在自定义单元格中将代码放在名为startJiggling的方法中，则可以在控制器中调用此方法：

[self.collectionView.visibleCells makeObjectsPerformSelector:@selector(startJiggling)];

确保所有可见细胞都开始摇晃。

然后我还会设置一些标志，表明你的细胞应该摇晃并在collectionView:cellForItemAtIndexPath:中测试它。如果是，则调用您的方法。

Answer 2

如果有人对如何在Swift 2.0中做到这一点感到好奇，下面应该是一个很好的起点。

let animationRotateDegres: CGFloat = 0.5
let animationTranslateX: CGFloat = 1.0
let animationTranslateY: CGFloat = 1.0
let count: Int = 1

func wobble() {
    let leftOrRight: CGFloat = (count % 2 == 0 ? 1 : -1)
    let rightOrLeft: CGFloat = (count % 2 == 0 ? -1 : 1)
    let leftWobble: CGAffineTransform = CGAffineTransformMakeRotation(degreesToRadians(animationRotateDegres * leftOrRight))
    let rightWobble: CGAffineTransform = CGAffineTransformMakeRotation(degreesToRadians(animationRotateDegres * rightOrLeft))
    let moveTransform: CGAffineTransform = CGAffineTransformTranslate(leftWobble, -animationTranslateX, -animationTranslateY)
    let conCatTransform: CGAffineTransform = CGAffineTransformConcat(leftWobble, moveTransform)

    transform = rightWobble // starting point

    UIView.animateWithDuration(0.1, delay: 0.08, options: [.AllowUserInteraction, .Repeat, .Autoreverse], animations: { () -> Void in
        self.transform = conCatTransform
        }, completion: nil)
}

func degreesToRadians(x: CGFloat) -> CGFloat {
    return CGFloat(M_PI) * x / 180.0
}

当我想让我的细胞摆动时，我这样做：

for cell in collectionView.visibleCells() {
        let customCell: MyCustomCell = cell as! MyCustomCell
        customCell.wobble()
    }

Answer 3

更新为swift 3语法：

Answer 4

将这行代码放在两个地方：

[self.collectionView.visibleCells makeObjectsPerformSelector:@selector(startJiggling)];    

1. -(void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath

2. -(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

Answer 5

雨燕5 像这样简单

将这2个函数输入到UICollectionViewCell中，并在需要动画/停止时调用它，例如：单元格渲染

func shake() {
    let shakeAnimation = CABasicAnimation(keyPath: "transform.rotation")
    shakeAnimation.duration = 0.05
    shakeAnimation.repeatCount = 2
    shakeAnimation.autoreverses = true
    let startAngle: Float = (-2) * 3.14159/180
    let stopAngle = -startAngle
    shakeAnimation.fromValue = NSNumber(value: startAngle as Float)
    shakeAnimation.toValue = NSNumber(value: 3 * stopAngle as Float)
    shakeAnimation.autoreverses = true
    shakeAnimation.duration = 0.15
    shakeAnimation.repeatCount = 10000
    shakeAnimation.timeOffset = 290 * drand48()

    let layer: CALayer = self.layer
    layer.add(shakeAnimation, forKey:"shaking")
}

func stopShaking() {
    let layer: CALayer = self.layer
    layer.removeAnimation(forKey: "shaking")
}

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