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• iPhone Pong Advanced Deflection Angle

  - by CherryBun

  Hi, I am currently developing a simple Pong game for the iPhone. Currently using CGRectIntersectsRect for the collision detection and as for the deflection of the ball when it hits the paddle, I just multiply the ball velocity with -1 (therefore reversing the direction of the ball). What I am trying to do is to make it so that when the ball hits the paddle, it checks whether how far is the ball from the center of the paddle, and increases the deflection angle the further the ball is away from the center of the paddle. (E.g. In this case, the ball will be deflected back at 90 degrees no matter where it came from, as long as it hits the center of the paddle) How am I suppose to do that? Any help would be greatly appreciated. Thank you.

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• iPhone Application And PayPal

  - by SK

  I want to integrate PayPal payment facility into my native iPhone application without using web interface so user does not have to leave from the current application. How can it be possible ? Should I use SOAP XML request/response mechanism? I come through following link http://www.slideshare.net/paypalx/learn-how-to-use-paypal-api-to-monetize-your-mobile-app. It contains In application Mobile Checkout via Mobile Web slide that represents the sample UI to access PayPal but how can I implement the same thing? Is it legal to use PayPal to deliver virtiual goods/Application Functionality or Apple can reject this ? Thanks.

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• Problem dispatching with google mobile analytics for iphone

  - by Eamonn

  I have integrated Google mobile analytics into my iphone app, but for some reason the page views and events are not dispatching. I put this into my app delegate applicationDidFinishLaunching method (i've x'd out the UA string): [[GANTracker sharedTracker] startTrackerWithAccountID:@"UA-xxxxxx-x" dispatchPeriod:10 delegate:self]; NSError *error; [[GANTracker sharedTracker] trackPageview:@"/home" withError:&error]; This is the delegate method: - (void)trackerDispatchDidComplete:(GANTracker *)tracker eventsDispatched:(NSUInteger)eventsDispatched eventsFailedDispatch:(NSUInteger)eventsFailedDispatch { NSLog(@"Google Analytics Dispatch: succeeded:%i, failed:%i",eventsDispatched,eventsFailedDispatch); } which prints out the message: Google Analytics Dispatch: succeeded:0, failed:190 Did anyone else run into this problem?

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• Editing and iPhone SDK Framework ?

  - by Chris

  I am working with MapKit and want to be able to add a (NSString *)itemTag value to each of my annotations. I have created myAnnotiation.m and myAnnotation.h I tried adding itemTag to the myAnnotation.h/m but when I try to access currentAnnotation.itemTag within my main code, it says "itemID not found in protocols" - so I went to the MapKit.Framework and into MKAnnotation.h. I added (NSString *)itemID, but when I save the .h file in the Framework, it changes the file's icon and doesn't appear to by jiving with everything else. Any help or links to help would be greatly appreciated. I am not even sure if I'm on the right path here, but Googling "modify iphone sdk framework" does not turn up much.

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• iPhone TabBar selection cancelling

  - by Chris Schnyder

  I am developing an iPhone app that displays several views, all acessed via Tab Bar items. However I need to add an additional item to the Tab Bar that simply launches a URL in Safari. I've accomplished this by adding an empty placeholder view to the TabBar and returning FALSE from shouldSelectViewController when the this view's tabBarItem is clicked on, and launching Safari at the same time. That code is: - (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController { if([[viewController tabBarItem] title] == "Website"){ //... launch Safari return FALSE; } else { return TRUE; } } PROBLEM: If the TabBar has too many items, and this "Safari Launch" tab is pushed off to the "More" navigation controller, I lose the capability to intercept the event and prevent the view from loading when clicked. Any suggested tips?

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• Class to manage e-mail from iPhone

  - by Scott Pendleton

  I'm working on an iPhone app that offers the user the opportunity to send an e-mail in 3 different places in the app, and for 3 different purposes. Rather than put the same code for showing the e-mail composer in 3 different view controllers, shouldn't I develop a separate E-mail class, create an instance, and then set properties such as To, CC, BCC, Body, HTML_Or_Not, and so on? Also, if I create an instance of such a class, and it brings up the e-mail composer, is it OK to release the class even before the e-mail composer has left the screen?

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• iPhone: fast hash function for storing web images (url) as files (hashed filenames)

  - by Stefan Klumpp

  What is a fast hash function available for the iPhone to hash web urls (images)? I'd like to store the cached web image as a file with a hash as the filename, because I suppose the raw web url could contain strange characters that could cause problems on the file system. The hash function doesn't need to be cryptographic, but it definitely needs to be fast. Example: Input: http://www.calumetphoto.com/files/iccprofiles/icc-test-image.jpg Output: 3573ed9c4d3a5b093355b2d8a1468509 This was done by using MD5(), but since I don't know much about that topic I don't know if it is overkill (- slow).

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• iphone build error that makes me want to buy a nail gun

  - by sol

  I'm just trying to build a simple update (which I have done before) for an iphone app, but now for some reason I'm getting this error. Can anyone tell me what it means? Command/Developer/Library/Xcode/Plug-ins/CoreBuildTasks.xcplugin/Contents/Resources/copyplist failed with exit code 127 sh: plutil: command not found Here are the Build Results: CopyPNGFile /Users/me/path/build/Dist-iphoneos/MyApp.app/img_000.png images/img_000.png cd /Users/me/ setenv COPY_COMMAND /Developer/Library/PrivateFrameworks/DevToolsCore.framework/Resources/pbxcp setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/System/Library/Frameworks/JavaVM.frameworK/Versions/1.6/Home/" "/Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Plug-ins/iPhoneOS Build System Support.xcplugin/Contents/Resources/copypng" -compress "" /Users/path/images/img_000.png /Users/me/path/build/Dist-iphoneos/MyApp.app/img_000.png sh: dirname: command not found CopyPlistFile /Users/me/path/build/Dist-iphoneos/MyApp.app/Entitlements.plist Entitlements.plist cd /Users/me/ setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/System/Library/Frameworks/JavaVM.frameworK/Versions/1.6/Home/" /Developer/Library/Xcode/Plug-ins/CoreBuildTasks.xcplugin/Contents/Resources/copyplist --convert binary1 Entitlements.plist --outdir /Users/me/path/build/Dist-iphoneos/MyApp.app sh: plutil: command not found

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• pitchbend (varispeed) audio with iPhone SDK's AudioUnit

  - by fetzig

  hi, I'm trying to manipulate the speed (and pitch) of a sound while playing. so i played around with iphone sdk's AudioUnit. downloaded iPhoneMultichannelMixerTest and tried to add an AUComponent to the graph (in this case a formatconverter). but i get (pretty soon) following error when building: #import <AudioToolbox/AudioToolbox.h> #import <AudioUnit/AudioUnit.h> ... AUComponentDescription varispeed_desc(kAudioUnitType_FormatConverter, kAudioUnitSubType_Varispeed, kAudioUnitManufacturer_Apple); ^^ error: 'kAudioUnitSubType_Varispeed' was not declared in this scope. any ideas why? the documentation on this topic doesn't help me at all (just api doc isn't very helpful when having no clue about the concept behind). there are no examples on how to wire these effects together and manipulating there properties...so maybe i'm totally wrong, anyway any hint is great. thx for help.

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• iphone email link not selected correctly

  - by mongeta

  Hello, I'm creating a link to open my App and pass some data in the URL. When I add the query parameter ? my link get broken. NSData *fileData = [NSData dataWithContentsOfFile:dataFilePath]; NSString *encodedString = [GTMBase64 stringByWebSafeEncodingData:fileData padded:YES]; NSString *urlString = [NSString stringWithFormat:@"myApp://localhost/backup?%@", encodedString]; the link is quite long, but also a shorter one doesn't work: myApp://localhost/backup?PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz48bG9jPjxpbmdyZWRpZW50VHlwZS and when the e-mail appears in the iPhone, only this is underlined and act as a link: myApp://localhost/ Adding the query as NeilInglis suggest it doesn't work also, the link is broken at same place. NSString *urlString = [NSString stringWithFormat:@"myApp://localhost/backup?query=%@", encodedString]; The Html is ON or OFF, it doesn't affect. If I enocode the URL it also doesn't work ... Don't know what I can try next ... any ideas ? thanks ... regards, r.

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• iPhone: Best Method for Passing Data to and from a Server

  - by SAPNA

  I am developing an iPhone application that downloads data from a website. The website database is implemented in SQL and the site itself uses the classic ASP interface. I am unsure as to which method would be best for transferring data to and from the server. Both JSON and SOAP require XML processing and I'm not sure how that affects performance or which of those two is best. What would be the best method in general for data transfer given the server configuration we currently have? I very new to this field and I'm a bit confused. Any help would be appreciated.

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• Determining the magnitude of a certain frequency on the iPhone

  - by eagle

  I'm wondering what's the easiest/best way to determine the magnitude of a given frequency in a sound. It's my understanding that a FFT function will return the magnitudes of all frequencies in a signal. I'm wondering if there is any shortcut I could use if I'm only concerned about a specific frequency. I'll be using the iPhone mic to record the audio. My guess is that I'll be using the Audio Queue Services for recording since I don't need to record the audio to a file. I'm using SDK 4.0, so I can use any of the functions defined in the Accelerate framework (e.g. FFT functions) if needed. Update: I updated the question to be more clear as per Conrad's suggestion.

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• Simplified iphone In-app store implementation for built-in product features

  - by Joey

  This question is for those familiar with implementing the iphone in-app store functionality. The app I'm building has only built-in features that are unlocked when features are purchased. Further, any modifications or additions to store items will require an app update. Also, it is only in English so has no localized languages for the items. If we take those assumptions, is it feasible to skip the step of retrieving the product info with SKProductsRequest and simply use hardcoded data within the app? While I may want to extend my app to greater complexity in the future, I'd like to know if this step to keep it simple would introduce some serious issues. One issue might be, for instance, if we have to expect a few of the items to occasionally be unavailable due to issues on Apple's side and simply trying to purchase it and letting it fail would not be a permissible or workable option in that case (especially if it is uncommon). Thanks.

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• Adding Existing Framework to Xcode (iPhone) error

  - by Urizen

  I have added the <QuartzCore/QuartzCore.h> to my Frameworks folder in my iPhone project and added the #import "<QuartzCore/QuartzCore.h>" statement at the top of a custom UIView class. However the custom UIView class gives me a "No such file or directory" compliation error in relation to the <QuartzCore/QuartzCore.h> framework. Is there something else I need to set so that the compiler can see the framework. I'm not expert on the Xcode IDE so any assistance would be extremely welcome.

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• Why No NSAttributedString on the iPhone?

  - by Jasarien

  Hey guys, Does anyone know what made Apple leave out NSAttributedString when turning AppKit into UIKit? The reason I ask is that I would really like to use it in my iPhone app, and there appears to be no replacement or alternative than doing it myself... It is possible to have mixed font attributes on a string - it's just a hell of a lot of work to to achieve something similar that was possible with a few lines of code with NSAttributedString. Also, doing all this extra drawing code myself makes my table view cells really heavy, and really hurts performance. Anyone got any ideas? Any genius's working on an opensource alternative to NSAttributedString?

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• Highlight Read-Along Text (in a storybook type app for iPhone)

  - by outtoplayinc

  I love this feature (well, my son loves it), and I would like to implement it in a kid's book app I am doing for iPhone, but I'm clueless where to begin. I'm using Cocos2d for all the animated sprite/transition stuff, but I'm not sure how to approach highlighting text as it is narrated. Example: "Jack and Jill, drank their fill, and were too drunk to go for water." As the text is narrated (.mp3 plays on each page), the text would be highlighted. I considered investigating Core animation, but I"m more familiar with Cocs2d at this point (tenuously at best). If someone has a clue, I'd really appreciate it. Brendang

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• map integration in iphone application

  - by Filthy Night

  Hi Guyz, i want to integrate maps using map kit in iphone, and i am successful at that, but now the problem which i am facing is i have 2 locations coordinates, Location1 and Location2, now i want those two points to be shown on map but i want that they appear on the screen both at 1 time, means if they are very far then the zoom level goes to that point and show those two points on the map, if they are near to each other then zoom level shows from that angel (i mean very near). now i know that using longitude delta and latitude delta i can fix this problem, but i cant find a way to make it dynamic, so that i dont have to hardcode the delta value Any Help appreciated. Thanks

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• Symbolicating iPhone App Crash Reports

  - by Jasarien

  I'm looking to try and symbolicate my iPhone app's crash reports. I retrieved the crash reports from iTunes Connect. I have the application binary that I submitted to the App Store and I have the dSYM file that was generated as part of the build. I have all of these files together inside a single directory that is indexed by spotlight. What now? I have tried invoking: symbolicatecrash crashreport.crash myApp.app.dSYM and it just outputs the same text that is in the crash report to start with, not symbolicated. Am I doing something wrong? Any help would be greatly appreciated, thanks.

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• Debug IPhone App on 3.1.2 Phone

  - by Steblo

  Hello, I recently finished my first IPhone app and want to test it on my device now. I registered (and paid) for an Developer Account and managed to install the required certificates. Unfortunately my device is on firmware 3.1.2 (which I don't want to upgrade). My SDK only shows 3.1.3 as possible Target. As a result it can't be installed on my 3.1.2 device. Where can I set/change to target platform ? Otherwise my App would only run on the newest firmwares, right ? Instead I want to provide it to every User with OS 3.0

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• I can create a cookie, but can't delete it from my iPhone app

  - by squeezemylime

  I am creating an iPhone app, and am using this method to create a cookie that will be accessed site-wide: NSMutableDictionary *cookieDictionary = [NSMutableDictionary dictionaryWithCapacity:4]; [cookieDictionary setObject:@"status" forKey:NSHTTPCookieName]; [cookieDictionary setObject:[self.usernameField text] forKey:NSHTTPCookieValue]; [cookieDictionary setObject:@"http://www.mydomain.com" forKey:NSHTTPCookieDomain]; [cookieDictionary setObject:@"/" forKey:NSHTTPCookiePath]; // Build the cookie. NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieDictionary]; // Store the cookie. [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie]; // Log the Cookie and display it for (cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) { NSLog(@"%@", cookie.value); } Now I am trying to delete it via the following method, but it isn't working, and the documentation isn't quite helping me: NSHTTPCookieStorage* cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage]; NSArray* theCookies = [cookieStorage cookiesForURL:[NSURL URLWithString:@"http://mydomain.com"]]; for (NSHTTPCookie *cookie in theCookies) { [cookieStorage deleteCookie:cookie]; }

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• Connecting to TFS from iPhone

  - by Andrei

  Hi. I'm building this iPhone application to connect to a secured TFS server (one that requires authentication before letting you access its web services). When I access this server in a browser, the first thing it will do is ask me for credentials (username/password) and then connect me to the TFS server if those credentials are correct. I am using web services, as I don't think there is any other way to use TFS functionality for an outside platform...without changing stuff on the TFS host machine. So my questions are: Are there any web services that can be accessed to log into the TFS server? This authentication mechanism seems to be something common among multiple websites (I have seen it in other websites). Is there a way to replicate that authentication mechanism by sending an HTTP request? Is there a way to replicate this authentication procedure in any way? Thanks!

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• iPhone grouped table view cell reuse

  - by William Jockusch

  My iPhone programs frequently contain grouped table views. A typical use might be for settings. The number of rows in these table views can run anywhere from roughly 2 to 20. The cells typically don't have a lot of uniformity. Should I be trying to reuse the cells? If so, how much commonality do cells need to have to get a shared identifier? For example, consider two cells with the same size, but one contains a slider and the other contains a label. Or is this just not worth the bother? Thanks

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• Button Application- iPhone Application

  - by Extremely frustrated

  I am a meganoob in iPhone Application programming. All I want to do is make an application with a single button. When you press the button, it plays an audio file. The button is just two images, one for the normal state and one for the pressed state. I have no clue how to get from point A to point B, it seems so straightforward in web design, why can't it be like that for this too? Anyone out there willing to drop some hints?

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• iPhone equivalent of Application.DoEvents();

  - by BahaiResearch.com

  iPHone: We use MonoTouch, but Obj-C answers are ok. My singleton domain object takes a while to get all the data so it runs internally parts of the fetch in a thread. I need to inform the UI that the domain is done. Currently I do this. Is there a better way? In WinForms I would call Application.DoEvents() instead of Thread Sleep. PlanDomain domain = PlanDomain.Instance (); while (domain.IsLoadingData) { Thread.Sleep (100); //this is the main UI thread } TableView.Hidden = false; TableView.Source = new TableSource (this); TableView.ReloadData ();

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• image with json and iphone

  - by alecnash

  Hi, I've got some images saved inside a db in a server and want to use them for my iphone. I created a php file so I can access them with json, got some questions though. I save all the text data from the db to a nsdictonary and it works fine. For the images should I use nsdata? Should I write a new php file for getting the image or is one enough because I am using an array to store my objects and then I use json_encode($arr) for json. Is it ok to store data to an array or is everything gonna crash?

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