ios - 如何在选中时缩放 CollectionviewCell 图像？

Question

我制作了一个应用程序，该应用程序与Custumcell conatin uicollectionView，并且每个单元格都包含我要在选择的任何图像时要制作的图像然后 collectionview 显示为 URBMediaFocusViewController Libraray

图书馆链接在这里URBMediaFocusViewController

我知道这个问题被问过很多次了，但请给我解决方案。

Answer 1

这不是很优雅，但我就是这样做的。基本上获取源 UICollectionView Cell 的框架位置和大小，您希望它出现的框架和位置(在本例中我填充 View )，然后在两个大小之间设置动画。希望这会有所帮助。

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

{

    [collectionView selectItemAtIndexPath:indexPath animated:YES scrollPosition:UICollectionViewScrollPositionCenteredHorizontally];

   [self zoomToSelectedImage:indexPath];

}


-(void)zoomToSelectedImage:(NSIndexPath *)indexPath

{

    UIImageView *zoomImage = [[UIImageView alloc] initWithImage:[self.myPictures objectAtIndex:indexPath.row]];

zoomImage.contentMode = UIViewContentModeScaleAspectFit;

CGRect zoomFrameTo = CGRectMake(0,0, self.view.frame.size.width,self.view.frame.size.height);

UICollectionView *cv = (UICollectionView *)[self.view viewWithTag:66]; // Change to whatever the tag value of your collectionView is 

cv.hidden = TRUE;

UICollectionViewCell *cellToZoom =(UICollectionViewCell *)[cv cellForItemAtIndexPath:indexPath];

CGRect zoomFrameFrom = cellToZoom.frame;

[self.view addSubview:zoomImage];

zoomImage.frame = zoomFrameFrom;

zoomImage.alpha = 0.2;

[UIView animateWithDuration:0.2 animations:

^{

     zoomImage.frame = zoomFrameTo;

     zoomImage.alpha = 1;

 } completion:nil];