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• Should all .png files be in power of two on the Iphone?

  - by Falcdawg21

  Hi All, When creating an UIImage file from a .png to be displayed on a button, view/cell background, etc. for a standard Iphone application, should all of them be in powers of 2 for optimization reasons?

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• Android Dev Phone 3?

  - by Thierry-Dimitri Roy

  I'm wondering if there is any news about a "Android Dev Phone 3"? Is an updated hardware of the "Android Dev Phone 2" that is coming soon? (probably an unlocked version of the Nexus One)

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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 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 / 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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• 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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• 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 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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• 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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• 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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• 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 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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• how to check gps singal whether is avliable on iPhone ?

  - by Robin

  as topic... I try to use the didError method , but it does not works ... if I am in room , the iPhone sdk seem insist try to got the location as it could in my app, even the value is not accurate ... how to deal with such problem ? thanks for your help in advance . Regards

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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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• 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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• Best practices to compile an iPhone app optimizing it for maximum speed?

  - by unforgiven

  I was wondering what people is doing in order to compile their iPhone applications optimizing them for maximum speed rather than size or the tradeoff speed versus size.

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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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