laverna | JavaScript note taking application with Markdown editor
kandi X-RAY | laverna Summary
kandi X-RAY | laverna Summary
Laverna is a JavaScript note-taking web application with a Markdown editor and encryption support. It's built to be an open source alternative to Evernote. The application stores all your notes in your browser databases such as indexedDB or localStorage, which is good for security reasons, because only you have access to them. Demo: OR
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QUESTION
I have the following setup: a UICollectionView
with a custom cell, where the user can select multiple cells and then perform some heavy image operation. Now I try to update the selected cells which the user selected with the result of that operation, which will be produced by a function of the subclassed custom cell. For all visible cells, the function is called on button press by the user and for all other cells, this happens via cellForItemAt
in order to be most efficient.
However, I face the problem now, that the visible cells are all updated but then after scrolling the cells right behind or before the visible cells do not get updated via cellForItemAt
but only when scrolling forth and back. Please see the attached video.
For demonstration purposes I just show a green UIView
for the image operation. Because that operation is resource heavy, I cannot use any of the UICollectionView
reloadData or similar, as they would deselect the selected cells, and manual re-selection will cause flickering.
ViewController
...ANSWER
Answered 2020-Mar-02 at 20:40UICollectionView defaults to prefetchingEnabled
== YES
, which means that the collection view will request cells before it needs to display them. If the app's state changes such that the cells that have already been fetched need to be displayed differently, you can implement the collectionView:willDisplayCell:forItemAtIndexPath:
method to update the cell.
It looks like this is exactly your problem... you turn on a feature that should change the way the cells look, but the cells that have been fetched but which aren't visible don't get updated. Implementing collectionView:willDisplayCell:forItemAtIndexPath:
should solve the problem.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install laverna
Open laverna.cc and start using it. No extra steps are needed.
Use a desktop app.
Use a prebuilt version from Laverna/static-laverna repository.
Build it from the source code.
Download the latest Laverna release for your operating system. After downloading the archive, you need to unpack it. Then, in the unpacked folder you need to run an executable (laverna.exe for Windows, laverna for Linux and Mac).
Open in your favorite browser the index.html file which is located inside laverna directory.
To install, do the following:. This project requires that you have the latest version of git installed. To do so, see Installing Git (first-time users of git might want to check out the next section for configuring git). Note: Windows users will have to set the PATH variable for git after installing it.
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