How to make faster pushing a UIViewController into a UINavigationController

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+1 Q:

How to make faster pushing a UIViewController into a UINavigationController

I have a multiple view based application, the problem is that when I push one UIViewController the device (only when I test it on a real device) freezes for a second or two, I don't know why is this happening since the pushed UIViewController has only one UITextField & a button. This only happens when the view is pushed the first time, after this pushing the view is smooth.

Any ideas on how to avoid this?

+1 A:

Are there any objects you can instantiate that are separate from the view controller you're pushing, which you can instantiate earlier? "Pre-loading" objects will help give the appearance of a faster view controller push.

Alex Reynolds 2010-07-04 08:22:08

Only fancy things I have in that UIViewController is a UITextField with a Red Courier Font. When the view is pushed I make the keyboard pop-up automatcally, when I dont make it pop up automatically the transition is great. It is not until I tap the UITextField to edit it that the application freezes for a second and then the keyboard appears. Is it because the font used is not already instantiated? What should I do?

El Developer 2010-07-04 21:40:00

You can instantiate fonts in your app delegate. Keep a property in your app delegate that you access from your view controllers. You can manage a "style sheet" of sorts by instantiating `UIFont` and `UIColor` instances in the app delegate or a separate "style" singleton class, making properties easily available to all other classes in your app.

Alex Reynolds 2010-07-05 05:05:34

Thanks, I will try that!

El Developer 2010-07-05 14:07:17

Seems like you have something heavy on leaving the original view controller.

Can you post the exact code (the entire method around the push) of pushing the controller?

Michael Kessler 2010-07-04 08:37:42

+1 A:

You should definitely use Instruments to find out what's happening at the time when you first push that controller.

Use the Intrument's CPU sampler tool and start a recording. Then do whatever you need to do in your app to push the controller. You will probably see a spike in the CPU-load chart. You can investigate stack traces at this point to find out what's happening and why that takes so long.

Nikolai Ruhe 2010-07-04 08:50:05

ansaurus

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How to make faster pushing a UIViewController into a UINavigationController

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