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• How do I remove a button from a view controller's toolbar on the iPhone?

  - by Tony

  I have code that works great for adding a button to the toolbar: NSArray* toolbarItems = [NSArray arrayWithObjects:flexibleSpace,shuffleBarItem,flexibleSpace,nil]; self.toolbarItems = toolbarItems; However, I also want to be able to remove toolbar items. When I use the below method, my application crashes: NSArray* toolbarItems = [NSArray arrayWithObjects:flexibleSpace,nil]; self.toolbarItems = toolbarItems; Does anyone know how I can dynamically alter the toolbar on the iPhone? Thanks!

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• iPhone: How do I get the title of a PDF document from within the document?

  - by Amagrammer

  Assuming I have extracted the CGPDFDictionaryRef from a PDF document using the iPhone SDK, how do I get the document's title from the dictionary? More generally, how can I get a list of the keywords for that dictionary? In theory I could ask the customer, but surely there must be some canonical keywords? Is there a list somewhere?

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• How does the OpenGL ES template work for the iPhone?

  - by thyrgle

  So, I've been trying to figure out why the square is moving up and down the iPhone simulator when Build and Go the template that Apple provides for OpenGL ES. I don't understand why for example they have ES1Render.m, and ES2Render.m instead of just one ESRender.m. Also, where is the equivalent of the glutDisplayFunc, and glutTimerFunc? Thanks in advance.

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• How do I detect when someone shakes an iPhone?

  - by Josh Gagnon

  I want to react when somebody shakes the iPhone. I don't particularly care how they shake it, just that it was waved vigorously about for a split second. Does anyone know how to detect this?

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• iphone: floats cast to unsigned ints get set to 0 if they are negative!?

  - by matt

  try it out: volatile float bob = -344.0f; unsigned int fred = (unsigned int)bob; printf("%d\n",fred); output will be 0. obviously I am expecting it to wrap around just as if I had cast from a signed int to an unsgined int (which does wrap and act as expected on the iphone) we assume it is something to do with the floating point settings. any ideas?

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• Is there any Apis to displayed the iWork files in iPhone?

  - by user291302

  I want to display some iWork file in iphone? Is there any apis to help to display it?

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• Do I need to keep "recompiling" my iPhone app code everytime apple releases a new iOS version?

  - by user1760606

  New here guys but have got a genuine problem. I have an iPhone app that was developed using SDK4. With apple introducing the new iOS version 6, does my code need to be recompiled on the new SDK to make it compatible with version 6? Right now it crashes on iOS6. Also, do I need to do that everytime apple brings out a new version? I wonder every other app on earth already does that ?! Thanks, Raghav

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• What will happen if my iOS 4 iPhone app gets executed on an iOS 3.2 phone?

  - by BeachRunnerJoe

  I assume it will just crash, right? If I develop an iPhone app that uses the iOS 4 SDKs and it makes it's way on into the app store, how can I ensure it doesn't get downloaded by a person running an older version of the iOS? Thanks in advance for your help!

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• How to make a simple audio equalizer for the iPhone?

  - by Flocked

  I want to make a simple audio equalizer for the iPhone, but I don't know how to start. The equalizer should be really simple and just change bass, high, distortion and maybe echo and chorus. How can I start? Maybe a sample code would be helpful.

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• Is het possible to read the iPhone phone number out of the settings?

  - by Chrizzz

  Hi, I would like to pre-populate a UITextfield with the phone number of the current iPhone device. Can that be done? regards, Christian

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• Use OpenGL ES to create an iPhone painting tool?

  - by Jeff

  Is it feasible to use OpenGL ES to create an iPhone raster graphics editor like SketchBook Mobile(http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=13872203)? Any related reference(tutorial, sample) you can recommend? Why I try to use OpenGL ES? Because it's hardware accelerated and cross-platform. Thanks in advance!

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• What language(s) should I learn to write web apps, iPhone apps, and websites?

  - by Gabe

  I'm in the process of learning C++. But there's so much more that I want to do online - web apps, iphone apps, websites. So I'm thinking of learning another language, one that would allow me to make (or at least attempt to make) useful applications. Now, what language should I look into learning? And, how do you recommend I go about learning it?

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• iPhone SQLite connection in domain object - close each time?

  - by BahaiResearch.com

  I have what I would consider a small sized iPhone app that uses SQLite. There is a singleton domain object which gets data from a SQLite database. Is it better to create and open the SQLite connection for each request, or to open the DB once and hold on to it for the duration of the app. The app's reason for being is the domain object so other objects will not need the DB.

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• Third-party epub readers for integration with iPad/iPhone app?

  - by lostInTransit

  Hi I would like to know whether there are any third-party epub reader APIs available on the internet which I can integrate with my iPhone/iPad app? Did a search through Google but couldn't come up with an API/reader which can be integrated within my app. Would appreciate any help. Thanks.

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• How to make tabbar visible when opening a mail view in iphone?

  - by Warrior

  I am new to iphone development.I want to create a tab bar with 5 view.In one view i should be able to open a mail composer.I am able to open the composer but mail composer view , i am not able to see the tab bar.How can i achieve that.Thanks.

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• Can we add UILabel to splash screen in iphone?

  - by prithviraj

  Hi experts, Can we add an view to the splash screen in iphone?. I have a default.png file in my resources directory but when the splash screen pops up i want to display an text on the splash screen image is it possible in code.

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• Is there a technology that can pinpoint an iPhone's *exact* location (to the feet/couple feet, indoo

  - by Julian

  Is there is a way to determine an iPhone's exact location (indoors, and to a distance of just a couple of feet) via use of radio/antenna's or some other infrastructure located around premises (i.e a hospital, shopping mall, school). Will appreciate any ideas/direction (technologies, research) as for how to overcome this limitation.

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• How to get public key from a certificate in iPhone programe?

  - by user104667

  Now I have a certificate which includes a public key,i want to get the public key from it in iPhone SDK programming, and encrypt a string by RSA with the public key.What should i do? Please help me!!Thanks very much.

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• Ok to implement backend/shared functionality for iPhone in JavaScript?

  - by John Wright

  Is it ok to use the Webkit Javascript engine to implement cross-platform, non-GUI backend functionality on the iPhone, iPad? In my case, I was interested in re-using Javascript code that I have that works on top of SQLite. I thought I would need to re-implement the logic in Obj-C but perhaps I could just share it and expose some hooks into Obj-C using JSCocoa or straight through JavaScript core. Is this legal per Apple guidelines?

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• comparison between iphone OS 3.0 and 3.1.3?

  - by Ankit Vyas

  i want to know in Detail comparison between iPhone OS 3.0 and 3.1.3 and also want to to about all newly added features in OS 4.0 so please give a link or some source which gives the comparison and Newly added features in details with Description.

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• Custom login form to Facebook on an iPhone app.

  - by VansFannel

  Hello. I'm trying to make an application that can connecto to facebook. I've found Facebook Connect for iPhone and I don't like the login form that it has. Is there any way to make a custom login form? Is there some api functions to call to login an user on Facebook? Thank you.

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• iphone sdk - why is the video returned not full res?

  - by ADAM

  im developing an app for the iphone and im able to get a video using a UIImagePickerController the problem is that the video thats returned by the UIImagePickerControllerMediaURL is not full resoultion -- its only 480 x 360 as opposed to 640 x 480 like the videos that sync to my itunes. -please someone tell me this is not a limitation of the current sdk? - how can i work around it and is there a way to set the uiimage picker so its taking full res video?

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• What is the best way to create continuously looping background in iPhone SDK ?

  - by catpad

  What is the best way to create a continuously looping background using iPhone SDK so that it seems the foreground object is in perpetual motion ? I have a background image which I want to move continuously at a given speed from right to left and seamlessly start displaying the beginning of the image when its end is reached. What is the best, most efficient way to do it to avoid any jumps and get optimal performance ?

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• How to check whether the cell has a subview or not in iphone?

  - by Warrior

  I am new to iphone development.I have a view called barView which is added as the subview to the cell, if want to check for the condition like this if(cell has a subview barview) { do something....... }else { do something...... } How can i check like this, please help me out.Thanks.

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• On iPhone, what does EPERM (errno == 1) mean in reponse to send() of UDP data?

  - by Chris Markle

  We sending data over UDP from the iPhone, sometimes, but not always, in response to our first send() of UDP data, we are getting back a -1 return code and errno set to 1 (EPERM / operation not permitted). The EPERM result for send(), sendto() and sendmsg() is not documented in the man pages as a return result from those functions. Has anyone out there encountered this and might be able to shed some light on what this errno value means in this context?

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