NSAttributedString from HTML data: slow and main thread only

Originator:steipete
Number:rdar://20973981 Date Originated:15-May-2015 04:09 PM
Status:Open Resolved:
Product:iOS SDK Product Version:iOS 8.3
Classification:Serious Bug Reproducible:Always
 
Summary:
-[NSAttributedString initWithData:options:documentAttributes:error] is slow and can only be used on the main thread. This should work on any thread.

Steps to Reproduce:
See attached example project that shows the slowness and the possible crash

Expected Results:
1. Fast conversion of a HTML string to a NSAttributedString
2. Usable from every thread

Actual Results:
1. VERY slow
2. Can crash in a background thread (because WebKit)

Notes:
To be fair, I didn’t managed to build a sample that crashes, these crashers are random and are easier to happen in a larger application where more stuff is going on with different html pages being parsed at the same time.

Comments

Example: http://cl.ly/3A1n3J3B442V

By steipete at May 15, 2015, 2:09 p.m. (reply...)

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