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## WWDC相关优化
### 2020 WWDC
- [Advances in UICollectionView](https://developer.apple.com/videos/play/wwdc2020/10097/)
> use section snapshots with your diffable data source to create outlines that ca…
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Any thoughts on reimplementing iCarousel using UICollectionView to do most of the heavy lifting? This would allow a very graceful solution to variable item widths/heights, etc.
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我想问下,UICollectionView 横屏完竖屏为嘛会产生向上偏移?怎么解决呢?我也遇到了
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"@nativescript-community/ui-label": "^1.0.57",
"@nativescript-community/ui-collectionview": "^4.0.9",
"@nativescript/ios": "7.0.6"
```
====== Assertion failed ======
Native stack trace:
1 …
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My uicollectionview has a list of cells which contains images. When I scroll up and down, cells show duplicate images. I think it causes by cache. I tried to set imageview.image = nil before set image…
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The frame of the empty imageview will be wrong if my collectionview have the Header view
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#### 操作说明
iOS18系统上,点击会话列表进入聊天页面出现崩溃闪退
#### 表现现象
iOS18系统上,点击会话列表进入聊天页面出现崩溃闪退,如果聊天页面为空,没有内容,不会崩溃,有聊天内容必崩
崩溃日志:
*** Assertion failure in -[UICollectionView _createPreparedSupplementaryViewForEleme…
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Implement grid view (UICollectionView on iOS)
![collectionview](https://cloud.githubusercontent.com/assets/16613330/20785979/3ccfab64-b771-11e6-9042-c0cb66f0ac72.jpg)
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Docs: https://developer.apple.com/documentation/uikit/uicollectionviewdelegate#3580853
### Already implemented
```swift
func collectionView(UICollectionView, contextMenuConfigurationForItemAt: …