ios - UICollectionView 移动项目并保持单元格大小
<p><p>我有不同大小的单元格，我正在尝试移动 CollectionView 单元格，并保持移动/选定的单元格大小移动到新位置。</p>
<p>我已经制作了<a href="https://github.com/JCzz/ProfileToOverview" rel="noreferrer noopener nofollow">project</a>在 Github 上公开，如果您想被添加为合作者，请告诉我？</p>
<p>我是子类 <code>UICollectionViewFlowLayout</code> 并实现了以下内容:</p>
<pre><code>- (UICollectionViewLayoutInvalidationContext *)invalidationContextForInteractivelyMovingItems:(NSArray<NSIndexPath *> *)targetIndexPaths withTargetPosition:(CGPoint)targetPosition previousIndexPaths:(NSArray<NSIndexPath *> *)previousIndexPaths previousPosition:(CGPoint)previousPosition{
UICollectionViewLayoutInvalidationContext *context = [super
invalidationContextForInteractivelyMovingItems:targetIndexPaths
withTargetPosition:targetPosition
previousIndexPaths:previousIndexPaths
previousPosition:previousPosition];
toIndexPath:targetIndexPaths];
return context;
}
</code></pre>
<p>也尝试在 UICollectionViewController 中实现这一点:</p>
<pre><code>-(NSIndexPath *)collectionView:(UICollectionView *)collectionView targetIndexPathForMoveFromItemAtIndexPath:(NSIndexPath *)originalIndexPath toProposedIndexPath:(NSIndexPath *)proposedIndexPath{
if (originalIndexPath.section == proposedIndexPath.section) {
returnproposedIndexPath;
}else{
return originalIndexPath;
}
}
</code></pre>
<p>你知道如何保持尺寸吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我遇到了同样的问题，原因是您需要调用委托(delegate)的 moveItemAtIndexPath。 </p>
<pre><code>- (UICollectionViewLayoutInvalidationContext *)invalidationContextForInteractivelyMovingItems:(NSArray<NSIndexPath *> *)targetIndexPaths withTargetPosition:(CGPoint)targetPosition previousIndexPaths:(NSArray<NSIndexPath *> *)previousIndexPaths previousPosition:(CGPoint)previousPosition{
UICollectionViewLayoutInvalidationContext *context = [super
invalidationContextForInteractivelyMovingItems:targetIndexPaths
withTargetPosition:targetPosition
previousIndexPaths:previousIndexPaths
previousPosition:previousPosition];
toIndexPath:targetIndexPaths];
return context;
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - UICollectionView 移动项目并保持单元格大小，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/39977555/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/39977555/
</a>
</p>
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