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I'm trying to test an app I'm developing on my iPhone. To do that I changed the target from Simulator to Device on Xcode. The application is correctly uploaded to the device and it works, or better, the main view is shown but if I try to open a secondary view, application crash.

Any good photo browsing library for Objective C, except Three20 ?

I read about bitwise operators today and they seem rather handy to me. I also noticed Apple uses them too, for example with UIViewAutoresizing .

I know the iphone home button is extremely crucial for the functioning of the iphone.

My website looks perfect on the iPhone but looks sub-optimal on the iPad. I'm having a lot of trouble finding information on the differences between iPad's webkit/safari rendering engine and iPhones' webkit/safari rendering engine.

It appears that all the touch methods of a UIView are only called if the touches began within the bounds of that view. Is there a way to have a view respond to a user who has touched outside the view, but then dragged his fingers into the view?

We have a great software foundation based on Microsoft MVC 2, Entity Framework 4, Repositories, POCOs, Service and Control layers, C# Views, JQuery and html. Firefox pulls 100 records in 250 ms, drops it in to a template, links the data to the markup, and we sit back and drink margaritas.

When we assign memory to a class variable, should we release it or set it to nil in dealloc method? What is the best practice?

I am using CorePlot to draw different graphs in my application. Then, I would like to save this graph to a jpg file and publish to some social networking site (e.g., Twitter).

I have a guitar diagram app for Android that I am porting to iOS. Android has a embedded midi synthesizer (sonivox), so I can generate midi files and let Android handle the playback.

So, I've been messing around with the Facebook iOS SDK for a bit and as of the latest version I can't get the fbDidLogin method to be called. The login process works fine, with Safari used on the simulator and the Facebook app being used when running it on a device. However, after logging in I get transferred back to my app (as I should be) but as the fbDidLogin method hasn't been called, nothing has changed. As far as my app is concerned I'm not logged in. The demo app that is bundled with the SDK works fine. So I'm obviously doing something wrong, but I have no idea how to check what. I triple-checked all the methods used in the demo app against my own and as far as I can see everything looks the same. Any thoughts or ideas on how to debug this? Or has anyone had similar problems?

I would like to change the color behind the flip from white to a different color or picture. Is that possible?

iOS SDK 4.2 includes a new UIApplicationDelegate method called application:openURL:sourceApplication:annotation: . It is a replacement for application:handleOpenURL: and offers more information about the calling application: not only do we get the bundle identifier of the calling app, but also, in the annotation argument,

I'm thinking of upgrading to iOS SDK 4.2. But what I'm wondering is if I'll still be able to run the simulator as iOS 3.2. This is because I'm creating iAds for iPad but I still want to check if my program will run with iOS 3.2.

I would like to start a server request, you can cancel.

In my iPhone app, I require to recognize the swipe gesture made by the user on the view.

Could somebody please show me how to use the object property on NSNotifcationCenter. I want to be able to use it to pass an integer value to my selector method.

I have a fluid CSS layout which is rendering badly on an iphone when I change the orientation. (It looks fine when it is refreshed).

Anybody knows the default font size of UITableViewCell?

How can I make a phone call programmatically on iPhone? i tried the following code but nothing is happening: