UITableView extremely slow on loading about dtcoretext HOT 6 CLOSED

There is a bug in iOS < 5 that causes the first time DTCoreTextFontSelector needs to look for a font takes long.

Workaround 1: http://www.cocoanetics.com/2011/04/coretext-loading-performance/
Workaround 2: create a font override for all the fonts and variants you use, this is what the Float app does.

On Jul 21, 2011, at 9:19 PM, zimok wrote:

When using an UITableView with DTAttributedTextContentView I noticed it takes a long time to load when the user request the ViewController, and it seems is blocking the main thread, because the UI become unresponsive until the TableView has been loaded.

I'm testing on a 2nd generation iPodTouch with iOS 4.1.

Is there any workaround for improve performance?

Note that the html I'm using is very simple.

Thanks.

Reply to this email directly or view it on GitHub:
https://github.com/Cocoanetics/NSAttributedString-Additions-for-HTML/issues/51

from dtcoretext.

Thanks for the reply.

I don't understand where to call CoreText for the first time, using Stuart workaround.

I tried in AppDelegate and in ViewDidLoad without success.

from dtcoretext.

AppDelegate is fine. But obviously that only works if your table view is not the first view showing, because then both will happen at the same time and there being no advantage. Thus I suggest you use the overrides instead because you'll only use Helvetica anyway I guess.

from dtcoretext.

Sadly, I had no results :(

This is my context:

• UITabBarController with 5 tabs
• 2nd tab is an UIVIewController with DTAttributedTextContentView (implements UITableViewDatasource, UITableViewDelegate protocols)
• 1st tab is a simple UIViewController with a label and an image

By using font overrides you mean to provide an NSMutableDictionary with font options to the NSAttributedString?

I also tried using async loader in AppDelegate, but nothing.
I tried with Helvetica and Georgia but the load time does not change.

Have any suggestion about what Symbols should I inspect on Time Profiler?

I'm going to think about that is something related to my code, but If I don't call anymore

- (DTAttributedTextContentView *)contentViewForIndexPath:(NSIndexPath *)indexPath

in my code, it runs without any performance issue.

Thanks again for you support.

from dtcoretext.

Sounds to me like your custom view are too slow. Do a profile and look where the hotspots are.

Sent from my iPhone

On 22.07.2011, at 14:37, zimok [email protected] wrote:

Sadly, I had no results :(

This is my context:

• UITabBarController with 5 tabs
• 2nd tab is an UIVIewController with DTAttributedTextContentView (implements UITableViewDatasource, UITableViewDelegate protocols)
• 1st tab is a simple UIViewController with a label and an image

By using font overrides you mean to provide an NSMutableDictionary with font options to the NSAttributedString?

I also tried using async loader in AppDelegate, but nothing.
I tried with Helvetica and Georgia but the load time does not change.

Have any suggestion about what Symbols should I inspect on Time Profiler?

I'm going to think about that is something related to my code, but If I don't call anymore

- (DTAttributedTextContentView *)contentViewForIndexPath:(NSIndexPath *)indexPath

in my code, it runs without any performance issue.

Thanks again for you support.

Reply to this email directly or view it on GitHub:
https://github.com/Cocoanetics/NSAttributedString-Additions-for-HTML/issues/51#issuecomment-1631420

from dtcoretext.

This appears to be a solved problem.

from dtcoretext.