我想动画集合视图单元格,动画应该是这样的:
首先单元格出现,然后在一些延迟第二单元格出现一些动画之后,对于所有单元格,这将继续显示
如何实现这一目标?
答案 0 :(得分:1)
解决方案是逐步创建数据源,以便在设置的定时延迟后添加单元格。添加后,插入
拨打电话,设置一个计时器,添加到您的dataSource,无论您喜欢什么延迟
[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(addToDataSource:) userInfo:nil repeats:YES];
然后在这个方法中,每0.05秒就会命中一次(在这个例子中)
-(void)addToDataSource:(NSTimer*)timer{
[self.yourMutableDataSourceArray addObject:OBJECT]
NSInteger arrayCount = self.yourMutableDataSourceArray.count;
[self.collectionView performBatchUpdates:^{
[self.collectionView insertItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:arrayCount-1 inSection:0]]];
} completion:^(BOOL finished) {
}];
//Once you have reached the desired count cells you wish, remember to invalidate the timer
}
performBatchUpdate
将意味着collectionView将重新加载动画。
我希望这会有所帮助
这是在Objective-C中,但如果您在swift
中写这个原则,则适用相同的原则答案 1 :(得分:1)
此处的另一个解决方案是使用willDisplayCell:forIndexPath
委托
以下是我如何做的示例。
func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {
if (!loadedIdx.contains(indexPath.row)) {
let cellContent = cell
let rotationAngleDegrees : Double = -30
let rotationAngleRadians = rotationAngleDegrees * (M_PI/180)
let offsetPositioning = CGPoint(x: collectionView.bounds.size.width, y: -20)
var transform = CATransform3DIdentity
transform = CATransform3DRotate(transform, CGFloat(rotationAngleRadians), -50, 0, 1)
transform = CATransform3DTranslate(transform, offsetPositioning.x, offsetPositioning.y, -50)
cellContent.layer.transform = transform
cellContent.layer.opacity = 0.2
let delay = 0.06 * Double(indexPath.row)
UIView.animateWithDuration(0.8, delay:delay , usingSpringWithDamping: 0.8, initialSpringVelocity: 0.5, options: .CurveEaseIn, animations: { () -> Void in
cellContent.layer.transform = CATransform3DIdentity
cellContent.layer.opacity = 1
}) { (Bool) -> Void in
}
loadedIdx.append(indexPath.row)
}
}
loadedIdx是一个数组,用于将单元格标记为已加载(下次出现时不显示动画)