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• iPhone filesystem POSIX-compliant?

  - by Seva Alekseyev

  Hi all, I'm trying to pass some files from one app to another. I communicate the path (via a custom URL). The target application cannot read the file, citing errno 13 (permission denied). I've checked the permissions on file - they're 0644 (O+R), the permissions on directories all the way up to the root are 755 (O+RX). From a POSIX perspective, the file should be readable to any process and any user. Yet it's not. Any ideas, please? I can think of some workarounds. I could use a Web service (upload, get a cookie, communicate the cookie to the other app, other app downloads). I could also pass the actual file data in the URL - unelegant, and probably subject to length limitations. Clipboard is not supported on iPhone OS 2 IIRC.

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• handling the logout functionality on the iPhone

  - by Nanz

  This is the first iPhone application i am working on. To use the application, the user has to login to our server. I am done with that part. Now the problem i am facing is how to logout the user from the server, deallocate all the memory and start afresh without quitting the app. After the user logs out, i want the exact same things to happen as in applicationdidfinishlaunching method. But i dont know how to go about it. The app has a tab bar which is set up in mainWindow.xib.

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• facebook iphone app architecture

  - by xoail

  does anyone know or predict how facebook's iphone app architecture could look like? More specific to what could be built into the app (client) what could be rendered on demand? Do you think the main menu layout of the app (where all the navigation buttons are there) are on the client or being rendered dynamically? Similarly apps like NYTimes or US News, what portion is done on the client and what is rendered dynamically. What could be the best way to render things on-demand. Would it be ok to use to UIWebView and render most of the app in it? A quick overview would help. Thank you!

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• Flowplayer RTMP streaming, mp4, Amazon Cloudfront and iPad/iPhone

  - by circey

  I've been working on a site where 2 video clips are streamed using Amazon Cloudfront and Flowplayer. You can see one video/page here: http://graemeclarkoration.org.au/gcorationp1.htm (works as a Highslide popup/modal window, hence the lack of adornment). While it works in all browsers and Android devices, I can't get it to work on an iPad or an iPhone; the page opens fine and the video box appears but the video never loads. Does anyone have any ideas how to fix or even why the video won't load? MTIA

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• iPhone: Setting Navigation Bar Title

  - by Arthur Skirvin

  Hey all. I'm still pretty new to iPhone development, and I'm having a bit of trouble figuring out how to change the title of my Navigation Bar. On another question on this site somebody recommended using : viewController.title = @"title text"; but that isn't working for me...Do I need to add a UINavigationController to accomplish this? Or maybe just an outlet from my UIViewController subclass? If it helps, I defined the navigation bar in IB and I'm trying to set its title in my UIViewController subclass. This is another one of those simple things that gives me a headache. Putting self.title = @"title text"; in viewDidLoad and initWithNibName didn't work either. Anybody know what's happening and how to get it happening right? Thanks!

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• iPhone Push Notification Reliablity

  - by David Beck

  How reliable do you find push notification on the iPhone to be? Does it improve when moving from the sandbox to production server? I am testing (with the sandbox of course) and have found that notifications are often delayed or not received at all. I am not talking about sending multiple messages and only the last one arriving, as the documentation indicates, but any notification never showing up. Also, I noticed that if I send a notification with an alert, and then send one with just a badge number, that the second notification will close the alert even after it's already opened. Does this happen between apps as well? For instance, if I send an alert for my app, and then the Facebook app sends a badge, will the Facebook badge close my alert window?

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• iPhone: Crash When Deleting UITableView Rows

  - by Ajeet Kumar Yadav

  Hi, I am new in iPhone development. I am developing an application that fetches a value from a database and displays it in a table view. I want to delete table rows one by one but the rows do not delete and the application crashes. Here is my row deletion code: - (void)tableView:(UITableView *)tv commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if(editingStyle == UITableViewCellEditingStyleDelete) { SanjeevKapoorAppDelegate *appDelegate =(SanjeevKapoorAppDelegate *)[[UIApplication sharedApplication] delegate]; list *animal =[appDelegate.list1 objectAtIndex:indexPath.row]; [appDelegate deleteCoffee]; [self.tableView reloadData]; //Delete the object from the table. [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; } I also delete all rows with this action: -(IBAction)deletebtn:(id)sender{ SanjeevKapoorAppDelegate *appDelegate =(SanjeevKapoorAppDelegate *)[[UIApplication sharedApplication] delegate]; [appDelegate deleteCoffee]; [self.tableView reloadData]; } How do I properly implement delete in an UITableView?

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• iPhone OS: Posting an image + text "story" to a user's news feed through the facebook api

  - by nickthedude

  So what I am trying to do is post an image that has been created by a user on an iphone into that users newsfeed. The functionality I am having a hard time understanding if it is possible: Can I pass a local NSURL (or URL?)(to a png file that lives in the documents folder) through a JSON string and onto Facebook? i want to mimic the action of a user going to his/her facebook page, clicking into the textfield for their newsfeeld, uploading an image by clicking the "photos" icon and selecting an image from a local disk and uploading it. I would also like to add some text into the post optionally. I'm just getting started with the Facebook api and it seems pretty tough right now, any help would be appreciated. code examples appreciated. Thanks, Nick

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• iphone tabbar with custom buttons and scrollvie

  - by chunjai

  i'm trying to get a tab bar effect not unlike russel quinn's 'creative review' app. the tabbar swipes across, which i have figured out, but the tabbar style itself is unlike anything i've seen on the iphone (though it looks so simple!). it has square buttons with a space between, and each button has a select/active/inactive state. i'm having a hard time seeing how this can be tabbar, but i don't know any other way. can someone explain this? here's the example :: http://bit.ly/c8CeBC. any help is appreciated.

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• posting twitter status whilst receiving tweets iphone mgtwitterengine

  - by d4ndym1k3

  i have set up a twitter client on my iphone using mgtwitterengine. i've managed to set it up so i can tweet and recieve status updates. using the standard set up you can only receive between 10&20 updates. to be able to receive more updates then that you have to put[_engine getFollowedTimelineSinceID:0 startingAtPage:0 count:50]; but this does not allow you to get more than the original amount untill you activateif (params) { fullPath = [self _queryStringWithBase:fullPath parameters:params prefixed:YES]; } in SA_OAuthTwitterEngine.m. my problem is when i do this i can no longer post a new status from my app. i can have upto 200 statuses in the stream but no posting capabilities. this is the error:Error Domain=HTTP Code=401 "The operation couldn’t be completed. (HTTP error 401.)" any help would be appreciated. many thanks in advance

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• iPhone OS: Rotate just the button images, not the views

  - by Jongsma

  Hi, I am developing an iPad application which is basically a big drawing canvas with a couple of button at the side. (Doesn't sound very original, does it? :P) No matter how the user holds the device, the canvas should remain in place and should not be rotated. The simplest way to achieve this would be to support just one orientation. However, I would like the images on the buttons to rotate (like in the iPhone camera app) when the device is rotated. UIPopoverControllers should also use the users current orientation (and not appear sideways). What is the best way to achieve this? (I figured I could rotate the canvas back into place with an affineTransform, but I don't think it is ideal.) Thanks in advance!

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• PHP script to process NSURLRequest from iphone

  - by tech74

  Hi, i will be sending a POST request to login.php on my server from an iphone app over HTTPS. The POST is created using NSMutableURLRequest. Is there an example of a PHP script to process this POST on my server. The POST isn't sent as a form as such , anyway not that i think it is. Not sure how NSMutableURLRequest formats this. I just need to know how to access the POST data on the server with the php script. All the examples ive seen regarding php scripts processing POSTS seem to be do with forms. So how do i process this? Any links etc most welcome. Thanks

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• iPhone CGContext: drawing two lines with two different colors

  - by phonecoddy

  I am having some troubles using the CGContext with an iPhone app. I am trying to draw several lines with different colors, but all the lines always end up having to color, which was used last. I tried several approaches I could think of, but haven't been lucky. I set up a small sample project to deal with that issue. This is my code, I use in the drawRect method. I am trying to draw a red and a blue line: - (void)drawRect:(CGRect)rect{ NSLog(@"drawrect!"); CGContextRef bluecontext = UIGraphicsGetCurrentContext(); CGContextSetLineWidth(bluecontext, 2.0); CGContextSetStrokeColorWithColor(bluecontext, [UIColor blueColor].CGColor); CGContextMoveToPoint(bluecontext, 1, 1); CGContextAddLineToPoint(bluecontext, 100, 100); CGContextSetStrokeColorWithColor(bluecontext, [UIColor redColor].CGColor); CGContextAddLineToPoint(bluecontext, 200, 100); CGContextStrokePath(bluecontext); } thanks for your help

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• iPhone: Setup static content of UITableView

  - by Martin

  This guide from apple https://developer.apple.com/iphone/prerelease/library/documentation/UserExperience/Conceptual/TableView_iPhone/TableViewCells/TableViewCells.html (you need login) explains how to use "The Technique for Static Row Content" to use Interface Builder to setup the cells in a tableview. I have some cells with different heights in my tableview. Without using the heightForRowAtIndexPath method everything get messed up. Do I still need to use this method or can I in some way setup the height of the cells inside the IB as I created them there? Also when using the "The Technique for Static Row Content" from the guide you still need to use the cellForRowAtIndexPath to setup the cells even if they are created in IB. I would like to setup the full layout of the tableview with all cells in IB (drag the cells right into the tableview), is that possible in some way? Thanks!

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• How can an animator do animation targeted for the iPhone

  - by teepusink

  Hi, I'm working with an animator for the iPhone. The animator I'm working with isn't a programmer and has a background in Flash. (right now she's doing the animation in Flash and I need to convert to Objective C). For some it's ok because I can just use image frames, but there are more complex animation that would take longer for me to convert to Objective C. Is there any tools out there that can help the work flow easier? Just trying to find a way so I can just take the animation and stick it into the project. Thanks, Tee

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• What you need BEFORE you submit your iPhone app to Apple

  - by Patty

  When submitting a new app to the iPhone app store, which of these are mandatory, and which are optional? (Free apps... or paying apps.) A bank account with direct deposit access. An email address to give out to the public. An email address for Apple to contact me. A support website. A company name. A support phone number for the public. A phone number for Apple to call me. My full name given out to the public.

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• Iphone - Displaying NSDate values in the debugger with local timezone

  - by Oliver

  Hello, I'm trying to debug my app and there is something very annoying in the debugger : all the NSDate values are displayed in the GMT timezone. So in my debugging process, I lose a lot of time converting by myself all the displayed dates to check if they are correct in the system timezone. As I have a lot of dates at midnight, even the day is displayed "wrong". It's a nightmare. Is there a way to make the debugger display the NSDate values in the iPhone system timezone (not the MacOS one nor GMT) ? I'm at GMT+1 Thank you for your help.

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• EXC_BAD_ACCESS on iPhone (with debugger screenshot)

  - by VansFannel

  Hello. I'm developing an iPhone application that show the camera's view with this code: -(void) displayAR { [rootViewController presentModalViewController:[self cameraController] animated:NO]; [displayView setFrame:[[[self cameraController] view] bounds]]; } And hide the camera's view with this code: - (void) hideAR { [[self locationManager] stopUpdatingHeading]; [[self locationManager] stopUpdatingLocation]; [[self accelerometerManager] release]; [rootViewController dismissModalViewControllerAnimated:YES]; } When I call hideAR, I get an EXC_BAD_ACCESS with the following debugger screenshot: Any advice?

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• Is OpenGL required for my iPhone game?

  - by Ben X Tan

  On an iPhone: If I am writing a game that has multiple levels, with multiple animations (image sequences), jpg and png (transparent), some full screen and some not, some looped and some played once only. What is the best way of doing it? Each level might have up to 10MB of images. Add on to this music, and video (cut scenes). All 2D graphics, no 3D models. Is OpenGL required? Or can this be achieved with Quartz or Core Animation?

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• I can't use dashes in XPATH on iphone using libxml2

  - by user249488

  I'm trying to parse HTML data using KissXML for iphone. I've noticed that I can't have dashes in the id() tag, otherwise it won't evaluate. For example, if I'm trying to get the element at I would do id("foo") However, if I try to get at element , and I try id("foo-bar") the libxml2 XPATH engine doesn't seem to return anything. It works using the XPATH check for firefox, though. Anyone run into this issue and know of a reason why it's happening or have a workaround (besides using the absolute XPATH path?)

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• iPhone: Using a Singleton with Tabview Controller and Navigation Controller

  - by malleswar

  Hi Friends, I have developed a small iPhone application by using singleton that I use to navigate through the views. Here is a sample method from my singleton class. + (void) loadMenuController:(NSMutableArray *)menuItems{ MenuViewController *menuViewControler = [[MenuViewController alloc] initWithNibName:@"MenuViewController" bundle:nil]; [menuViewControler setMenuItems:menuItems]; RootViewController *root = ( P2MAppDelegate *appDelegate = (P2MAppDelegate*) [[UIApplication sharedApplication] delegate]; UINavigationController *navController = [appDelegate navigationController]; [navController pushViewController:menuViewControler animated:YES]; [menuViewControler release]; } Now my requirement has changed to require a tab view controller . I could change my application delegate to a tabview controller but I still need to navigate inside each tab. I am unable get a clue how to navigate from my singleton class. Please guide me. Please let me know if my query is not clear. Thanks in advance. Regards, Malleswar

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• Common, reusable iPhone-App configuration screen

  - by Janey

  I'm writing code that will allow my iphone-app to have a "configuration page". A grouped, scrolling, UITableView... with cells that contain the needed textFields, switches, sliders, etc. It is an ENOURMOUS amount of code. Is there an easier way? Is there a way I could create a simple text-file, contain all my desired design choices and have my (reusable) code build the TableView for me? Or... can I just do the whole thing quicker/easier in Interface Builder instead of code?

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• Optimizing an iphone app for 3G in landscape with opengl, camera, quartz

  - by Joey

  I have an iphone app that basically uses the camera, an opengl layer, and UIViews (some drawing with Quartz). It runs ok on 3GS, but on the 3G it is unusable. Particularly, when I press a UIButton, it literally takes sometimes 10 seconds to register the press. Shark doesn't do me much good because it crashes when I try to profile even a tiny portion, and I've tried turning off some of the layers to see if they might be obvious contributors to the lag. I've noticed that turning off the camera really helps. I'm wondering if anyone has any familiarity with this and might suggest some likely causes. I had issues with extreme slowdown from running my app in landscape mode and using transforms, so considered that might be a cause, but I'm wondering if hoping for a 3G to run something with all of the above elements is just not really possible considering the camera seems to really cost a lot. The fact that the buttons are horribly delayed in their response makes me think there is something fundamental that I might be missing.

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• iPhone UIView element similar to the lock screen

  - by Travis

  Does anyone know if there is an open source project for an UIView element that acts in a similar way to the lock screen for the iPhone. I am working on an app that has some sensitive data, and I want to add another layer of comfort for users, to be able to setup a 4 digit pin number on the app. I've seen apps like LoseIt and Weightbot that have similar functionality. There isn't any element for this in the UI Library from what I've been able to find, and was hoping some kind soul might have open sourced something similar to this. Thanks in advance!!!

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• iPhone/ObjC - How to create a custom keyboard

  - by HM1

  Hi, iPhone/objC question: How do I go about creating a custom keyboard/keypad that will show up when some one taps on a UITextField? I would like to display a keypad with a, b, c, 1, 2, 3 and an enter button, nothing else. The keypad should work and behave like the standard keyboard does (in behavior) but it will definitely look different. I can't find any example and the best I've found is to filter characters with existing keyboard which is an unacceptable solution. Thanks in advance, Hiren.

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