CODEWITHSUNDEEP
ioscore-text
Jonas
Jonas

Reputation: 151

Core Text occasionally fails to produce results [iOS]

I’m helping out a company with a project for iOS, which is using Core Text. Some users of the app have reported that text is occasionally missing from within the app. It seems™ that this is somewhat memory related, because it’s solvable by shutting down the app along with background apps.

I made a few lines of code which simulates the use of the app – so the app “runs itself”, navigating between view controllers randomly, scrolling in text fields etc – to track if this issue occurs by normal use.

I’ve found some memory leaks related to the use of Core Text, but according to instruments the amount of memory lost is quite low. However, when the simulation has been running for about 20 minutes or so, the app is shut down by the os because of memory warnings.

I’m intending to fix this memory leaks, but my problem is that I will not be able to ensure that this fixes the main bug (missing text), since I cannot reproduce it myself.

So my final question is: have anyone experienced issues with missing text on iOS while using Core Text, which are due to leaked memory? Does it sound plausible? If so, is this related to only specific versions of iOS?

I appreciate any answers that can help me out!

Upvotes: 0

Views: 150

Answers (1)

MrTJ
MrTJ

Reputation: 13182

UIViewControllers may implement didReceiveMemoryWarning that the system calls when your app is on low memory. Framework classes, as core text, are most likely do implement this and act accordingly to save memory. So it is possible that your core text object aims to help your app resolving the low-mem situation with freeing some of its resources that can even cause it to blank its contents. Fix first all memory leaks in your app.

On the other hand, all bugs are very difficult to correct if you can't reproduce them. If you suspect that the issue is due to low memory, try to simulate this yourself by allocating huge amount of memory in your application and hope that you can reproduce the erroneous behavior that way.

Upvotes: 1

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