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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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• 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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• 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 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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• 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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• 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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• 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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• 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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• 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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• 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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• iPhone / Cocoa - Are NSThreads less efficient than POSIX threads, or is the diff negligable?

  - by jtrim

  I'm looking at putting together a high-performance multi-threaded iPhone app that's doing a couple of fairly high-intensity operations concurrently. Is the performance difference between NSThread and POSIX threading enough to care about here? If so, I would assume POSIX threads would be more efficient because it bypasses the obj-c overhead. Is this correct?

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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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• 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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• iPhone Mapkit: How can I get a real business name/address from a longitude/latitude?

  - by vavajo

  I'm writing an iPhone application and trying to determine how to find a business name/address from a user's current GPS location (longitude/latitude). For example, if someone if using the application from inside a Starbucks, how can I find this out from their location? Is there a way to do this using mapkit or any API/Webservice? Many Thanks!

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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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• 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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• 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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• 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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• 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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• How to convert a video via ffmpeg to an mp4 format that will stream and/or download to iPhone and Bl

  - by Yegor

  I have a site where people upload videos, which are converted to .flv format. Simple. I wanted to also convert to an mp4 format that will "stream" to an iphone and blackberry, or allowed to be downloaded to either, for later viewing. Can someone post a working ffmpeg line to accomplish this task? Closest I got was this (which doesn't work) ffmpeg -i in.avi -f mp4 -vcodec libx264 -maxrate 1000 -qmin 3 -qmax 5 -bufsize 4096 -g 300 -acodec libfaac -s 480x320 -ab 128k -qscale 7 out.mp4

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• Is it possible to decode an MMS+WMA2 stream using audio units on the iPhone?

  - by Nick Toumpelis

  I am not sure whether audio units can work as codecs in a streaming audio scenario on the iPhone. I've read in various places that it can be done, but I haven't seen any examples or proper documentation for that. Instead, I find that most of the apps released have utilised ffmpeg and libmms. I appreciate any help or pointers you can give me.

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• How to perform an NTLM challenge on the iPhone.

  - by toast

  I'm trying to access some web services in an iPhone application. If I GET to the .asmx page, I authenticate and get the WSDL as expected. However, if I POST to the .asmx page, setting the SOAPAction, Content-Type, Content-Length, and HTTPBody, I just keep getting didReceiveAuthenticationChallenge messages. Additionally, I'm trying to POST to IIS using Integrated Windows Authentication (IWA), which means I'm trying to negotiate an NTLM challenge.

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• Does Objective-C have garbage collector on the iPhone?

  - by user208662

  Hello, I'm thinking of writing an app for the iphone. But I'm confused in regards to the objective-c language. Am I correct in saying that I have to do my own memory management? Is Objective-C a managed language such as C# and/or Java? Thank you!

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