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• Interface Builder vs Cocos 2D - how choice the best for your app.

  - by baDa

  Hello everyone! I was a flash developer for 3 years, and in the last 5 months, i begin the iphone development, i do 2 applications with interface builder for clients, and now i really want to do a little game, is quite simple, one match 3! I made the engine in interface builder, and seens good to me! But after i read some posts, i really want to try it in the cocos2D! So, in 2 days i rewrite all my first engine for cocos2D, very annoying upsidedown coordinates but ok, i really do! But the performance side by side with interface builder version is really scare! Many Many slow downs at the cocos2d side! And the animation seens bugged to me! I really scare! I really don't know what is the best choice for a simple game. And i want some opinions: Using cocos2d when need some physics? When we have many objects at screen? What is the performance boost i have with cocos2D? I have how to share this 2 applications with you guys?! Without your UID?!

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• Read/Write on Plist file without using the iPhone SImulator?

  - by Silent

  Hello all, i am using an example from the iphone developer book from apress. the problem is that this example only works on the simulator im trying to figure out how i can make it work on the device. This chapter isn't working at all. below is the sample code. data.plist is located in the resource folder. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; return [documentsDirectory stringByAppendingPathComponent:kFilename]; Below then checks to see if the file is located. this is skipped, so im guessing this does not find the file. if ([[NSFileManager defaultManager]fileExistsAtPath:filePath]) { NSArray *array = [[NSArray alloc] initWithContentsOfFile:filePath]; BGDataSave = [array objectAtIndex:0]; NSLog(@"%@", BGDataSave); price.text = [array objectAtIndex:1]; percent.text = [array objectAtIndex:2]; salepriceLabel.text = [array objectAtIndex:3]; origpriceLabel.text = [array objectAtIndex:4]; }

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• iPhone: Application Install Fails With "Invalid Signer" Error

  - by Scot

  The iPhone is attached to a Mac runnning the latest iTunes version and I am 100% sure that her UDID is in the provisioning file. Her iPhone has not been jailbroken and we even restored it to factory settings. I am having trouble installing our development build on this one iPhone. The error is: the application "[Application Name]" was not installed on the iPhone "iPhone" because the signer is not valid I am 100% sure that the UDID is accurately entered in the provisioning file and that they correctly copied the right provision file/build combo. This same combo has been successfully installed on over a dozen iphones. We have been able to install this on some devices with no problems. Edit: From comments to an answer: We can install it on 100 iphone with our account. We have about 40 iphones in this provisioning profile and it works on 38 of them.

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• Why does CLLocationManager returns null locations on the iphone SDK 4 beta in the Simulator?

  - by Rigo Vides

  Hi everyone, I have this piece of code: - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSLog(@"Manager did update location!!"); self.currentLocation = newLocation.description; } I have this code inside a class that conforms to the CLLocationManagerDelegate. I tested earlier in sdk 3.0 and works nice (on both simulator and device). I'm testing this class on the SDK 4, in the simulator, but it gives null as a newLocation. I can't even get the NSLog for the first call. I checked other app where I use the location framework and it doesn't work either. I implemented the locationManager:didFailWithError: message also, wich is never called. Can anyone please confirm that the simulator can't do any CLLocationManager capabilities? (a link where the bug is reported as a known issue will be awesome). Is there a way to fix this? Thanks in advance.

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• "Symbol not found" error for UIPopoverController in an iPhone/iPad Universal App

  - by alexbw

  In a universal binary iPhone/iPad app of mine, users are able to adjust preferences in a view controller that's presented modally. On the iPhone, the settings panel is presented with presentModalViewController:animated:, and on the iPad, I use a UIPopoverController. I'm having a heck of a time completely isolating the UIPopoverController code away from the iPhone code. Everytime I compile for the iPhone, I get the following error: dyld: Symbol not found: _OBJC_CLASS_$_UIPopoverController Referenced from: /var/mobile/Applications/CBB37F87-AA6D-47E2-823A-E259E3268A32/MyApp debug.app/MyApp Expected in: /System/Library/Frameworks/UIKit.framework/UIKit This is of course because UIKit on the iPhone doesn't have a UIPopoverController class. Does anybody have advice for how to effectively isolate the iPad API includes from the iPhone code, so I can actually run my code?

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• does the accelerometer work for the iphone/ipad simulator?

  - by Mark

  From what I can tell, my app should be firing accelerometer events while Im using the iPad simulator in XCode, but its not. I have googled around and it somewhat seems that the accelerometer is not implemented in the simulator, is this correct? If so, why on earth would they have a "Hardware-Shake Gesture" menu option? My code is as follows: .h file: @interface MyViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate, UIAccelerometerDelegate>{ UIAccelerometer *accelerometer; //...other stuff } @property (nonatomic, retain) UIAccelerometer *accelerometer; @end then the .m file: @implementation MyViewController @synthesize accelerometer; - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { NSLog(@"%@", [NSString stringWithFormat:@"%@%f", @"X: ", acceleration.x]); NSLog(@"%@", [NSString stringWithFormat:@"%@%f", @"Y: ", acceleration.y]); NSLog(@"%@", [NSString stringWithFormat:@"%@%f", @"Z: ", acceleration.z]); } - (void)viewDidLoad { [super viewDidLoad]; self.accelerometer = [UIAccelerometer sharedAccelerometer]; self.accelerometer.updateInterval = .1; self.accelerometer.delegate = self; } @end Does this look right?

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• How to get the same UITableViewCell layout as in the Address Book app?

  - by Romain

  Hi, I currently have a custom UITableViewCell which contains a few labels, and an image. The "main" label is used to display people's names. Currently, I'm styling it in bold text. What I'd like to do (to gain some space and readability), is to mimic the Address Book app cell style, that is: first name in light text, and family name in bold text. Is there a way to do this using the same UILabel? Or, should I use 2 different UILabels? How should I layout them, without knowing their sizes? Thanks in advance for your assistance!

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• iphone OS 3.1.3 requires snow leopard upgrade

  - by unsorted

  itunes asked me to upgrade my iphone's OS to 3.1.3, so I complied naively. then xcode told me that the latest iphone OS version it could support was 3.1.2. So I went to download a new version from https://developer.apple.com/iphone/index.action#downloads, xcode 3.2.2 with iphone SDK. but when i went to install that, i was told I needed snow leopard 10.6.2 or later. so I'm just making sure that I am not misinterpreting anything when I say that, given that it is impossible to downgrade iphone OS versions without jailbreaking, I need to install a new version of the OS just so I can resume testing apps on my iphone?

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• On iPhone, how do I show a login screen to get username and password before giving access to iPhone

  - by MikeN

  On iPhone, how do I show a login screen to get username and password before giving access to iPhone app? Also, does the iPhone store a cookie to the secure website like a web browser? I was thinking of giving users to my website a long API key to store in the settings of their iPhone instead of asking them to login with a username/password (seems to be the Slicehost iPhone app approach.) Which is the best way to get a user to login securely? I have full control over the design of the iPhone app and website so have a lot of flexibility.

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• want to fetch the friends list of facebook thorough fbconnect in iphone using objective-c ?

  - by uttam

  how to fetch the friends list of facebook in iphone through fbconnect in objective-c? I am using this code (void)getUserName { NSString *fql = [NSString localizedStringWithFormat: @"SELECT uid FROM user WHERE is_app_user = 1 AND uid IN (SELECT uid2 FROM friend WHERE uid1 = %lld)",[FBSession session].uid]; NSDictionary* params = [NSDictionary dictionaryWithObject:fql forKey:@"query"]; [[FBRequest requestWithDelegate:self] call:@"facebook.friends.get" params:params]; } - (void)request:(FBRequest*)request didLoad:(id)result { if ([request.method isEqualToString:@"facebook.fql.query"]) { NSArray* users = result; NSDictionary* user = [users objectAtIndex:0]; NSString* name = [user objectForKey:@"name"]; _label.text = [NSString stringWithFormat:@"Logged in as %@", name]; } else if ([request.method isEqualToString:@"facebook.users.setStatus"]) { NSString* success = result; if ([success isEqualToString:@"1"]) { _label.text = [NSString stringWithFormat:@"Status successfully set"]; } else { _label.text = [NSString stringWithFormat:@"Problem setting status"]; } } else if ([request.method isEqualToString:@"facebook.freinds.get"]) { if(myList==nil) { NSArray* users = result; myList =[[NSArray alloc] initWithArray: users]; for(NSInteger i=0;i<[users count];i++) { NSDictionary* user = [users objectAtIndex:i]; NSString* uid = [user objectForKey:@"uid"]; NSString* fql = [NSString stringWithFormat: @"select name from user where uid == %@", uid]; NSDictionary* params = [NSDictionary dictionaryWithObject:fql forKey:@"query"]; [[FBRequest requestWithDelegate:self] call:@"facebook.fql.query" params:params]; } } else { NSArray* users = result; NSDictionary* user = [users objectAtIndex:0]; NSString* name = [user objectForKey:@"name"]; //txtView.text=[NSString localizedStringWithFormat:@"%@%@,\n",txtView.text,name]; NSLog(name); }} I want to get the friends list from facebook and then search/modify then add it to my addressbook. I know this code is doing this but I don't know how to use it or where do I use it.. If you could please post something or just elaborate on how do I use your code thru fbconnect framework. I have implemented upto get permissions and publish feeds one's wall. But please can you post here about the layout details of the results, like what do Ineed to use on the layout point of view.

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• IPHONE SDK, How to put Void function into my BOOL??? PLEASE!

  - by Harry

  I am using the IPhone's Accelerometer to make a object move. I want to be able to make this function work and not work depending on different states. I have my code for my Accelerometer function and i want to put it into a BOOL so i can call on it when i need it, but i am having problems. Can anyone Help me put this code into a BOOL named: -(BOOL) accelerometerWorks -(void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{ valueX = acceleration.x*25.5; int newX = (int)(ball.center.x +valueX); if (newX > 320-BALL_RADIUS) newX = 320-BALL_RADIUS; if (newX < 0+BALL_RADIUS) newX = 0+BALL_RADIUS; int XA = (int)(balloonbit1.center.x +valueX); if (XA > 320-BALL_RADIUS) XA = 320-BALL_RADIUS; if (XA < 0+BALL_RADIUS) XA = 0+BALL_RADIUS; int XB = (int)(balloonbit2.center.x +valueX); if (XB > 320-BALL_RADIUS) XB = 320-BALL_RADIUS; if (XB < 0+BALL_RADIUS) XB = 0+BALL_RADIUS; int XE = (int)(balloonbit5.center.x +valueX); if (XE > 320-BALL_RADIUS) XE = 320-BALL_RADIUS; if (XE < 0+BALL_RADIUS) XE = 0+BALL_RADIUS; int XF = (int)(balloonbit6.center.x +valueX); if (XF > 320-BALL_RADIUS) XF = 320-BALL_RADIUS; if (XF < 0+BALL_RADIUS) XF = 0+BALL_RADIUS; int XH = (int)(balloonbit8.center.x +valueX); if (XH > 320-BALL_RADIUS) XH = 320-BALL_RADIUS; if (XH < 0+BALL_RADIUS) XH = 0+BALL_RADIUS; ball.center = CGPointMake (newX, 415); balloonbit1.center = CGPointMake (XA, 408); balloonbit2.center = CGPointMake (XB, 395); balloonbit5.center = CGPointMake (XE, 388); balloonbit6.center = CGPointMake (XF, 413); balloonbit8.center = CGPointMake (XH, 426); } Please help. i have been trying for ages with no success. Thanks. Harry.

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• iPhone: How to purge a cached UITableViewCell

  - by iPhone dev

  iPhone SDK question: Does anyone have suggestions on how to purge a cached UITableViewCell I'd like to cache these cells with reuseIdentifier. However, there are times when I need to delete or modify some of the table rows. I expect to call reloadData after the row changes. Right now, dequeueReusableCellWithIdentifier always returns the cached(obsolete) entry from before. How do I indicate that the cache is stale and needs to be purged ?

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• Combining iPhone/iPad apps into one universal app

  - by user324881

  I have two apps (one for the iPhone, the other for the iPad) that I'd like to combine into one universal app. For my first attempt, I tried creating a new universal app project and added the libraries for the iPhone and iPad versions. The iPad version compiled and ran fine (as expected), but the iPhone version didn't. My hope was that I could create a universal app that would execute only the project in the iPhone library when running on the iPhone and vice versa for the iPad. It seems like this should still work. Is there a way to tell the universal app project to ignore one of the external libraries when compiling for the iPad and vice versa for the iPhone? Thanks!

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• How to check for local Wi-Fi (not just cellular connection) using iPhone SDK?

  - by Michael

  I'm currently using the following to check whether Wi-Fi is available for my application: #import <SystemConfiguration/SystemConfiguration.h> static inline BOOL addressReachable(const struct sockaddr_in *hostAddress); BOOL localWiFiAvailable() { struct sockaddr_in localWifiAddress; bzero(&localWifiAddress, sizeof(localWifiAddress)); localWifiAddress.sin_len = sizeof(localWifiAddress); localWifiAddress.sin_family = AF_INET; // IN_LINKLOCALNETNUM is defined in <netinet/in.h> as 169.254.0.0 localWifiAddress.sin_addr.s_addr = htonl(IN_LINKLOCALNETNUM); return addressReachable(&localWifiAddress); } static inline BOOL addressReachable(const struct sockaddr_in *hostAddress) { const SCNetworkReachabilityRef target = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr *)hostAddress); if (target != NULL) { SCNetworkReachabilityFlags flags = 0; const BOOL reachable = SCNetworkReachabilityGetFlags(target, &flags); CFRelease(target); return reachable && (flags & kSCNetworkFlagsReachable); } return NO; } This, however, does not return NO as it should when the iPhone is connected only to a cellular network but not a Wi-Fi network. Does anyone know how to fix this? Edit So this is what I ended up using: #import <arpa/inet.h> // For AF_INET, etc. #import <ifaddrs.h> // For getifaddrs() #import <net/if.h> // For IFF_LOOPBACK BOOL localWiFiAvailable() { struct ifaddrs *addresses; struct ifaddrs *cursor; BOOL wiFiAvailable = NO; if (getifaddrs(&addresses) != 0) return NO; cursor = addresses; while (cursor != NULL) { if (cursor -> ifa_addr -> sa_family == AF_INET && !(cursor -> ifa_flags & IFF_LOOPBACK)) // Ignore the loopback address { // Check for WiFi adapter if (strcmp(cursor -> ifa_name, "en0") == 0) { wiFiAvailable = YES; break; } } cursor = cursor -> ifa_next; } freeifaddrs(addresses); return wiFiAvailable; } Thanks "unforgiven" (and Matt Brown apparently).

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• Xcode 3.2 says the version of iPhone OS isn't supported when my iPhone OS is version 3.1.3

  - by fr0man

  I just went through the whole certificate/keychain/provisioning/appID/profile/DNA test process to get my app running on my iPhone. Turns out my iPhone OS was out of date (3.0.1 I think), so I updated it. Now it says The version of iPhone OS on “Stefanie's phone” does not match any of the versions of iPhone OS supported for development with this copy of Xcode. Please restore the device to a version of the OS listed below. If necessary, the latest version of Xcode is available here. OS Installed on Stefanie's phone 3.1.3 (7E18) Xcode Supported iPhone OS Versions 3.1.2 (7D11) 3.1.1 (7C146) 3.1.1 (7C145) 3.1 (7C144) 3.0.1 (7A400) 3.0 2.2.1 2.2 2.1.1 2.1 2.0.2 (5C1) 2.0.1 (5B108) 2.0 (5A347) But I have Xcode 3.2.1, which is supposed to support iPhone OS 3.1.3. What am I doing wrong? I have a cruddy internet connection (HughesNet), so I can't upgrade the Xcode SDK without it taking literally days.

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• iPhone: App crashes when I click on a cell in table view.

  - by Jack Griffiths

  Hi there, Compiling my application works—everything is fine. The only errors I get are by deprecated functions (setText). The only problem is now, is that when I tap on a cell in my table, the app crashes, even though it's meant to push to the next view in the stack. Any solutions are appreciated, if you need any code, just ask. Also, how can I only make sure that one cell goes to only one view? For example: When I tap on CSS, it takes me to a new table with different levels of CSS. WHen I tap on an item in that new view, it comes up with an article on what I just selected. Regards, Jack

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• Minimum OS version number, iPhone app

  - by Michael Frost

  Hi all I've built an iPhone app which is live in the app-store. When originally submitting the app it showed up in App Store as requiring iPhone OS 3.1.3. When later updating the app I made sure my settings in Xcode for the target for the app store build had the Base SDK version set to 3.1.3 and the Deployment Target version set to 3.0, however it still shows up in app store as requiring 3.1.3. From what I've understood the Deployment Target version is the one setting the requirement in app store? Or is there any information concerning this that I should have updated in iTunes Connect when submitting the updated app? Thanks, Michael

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• How do you create a writable copy of a sqlite database that is included in your iPhone Xcode project

  - by Iggy

  copy it over to your documents directory when the app starts. Assuming that your sqlite db is in your project, you can use the below code to copy your database to your documents directory. We are also assuming that your database is called mydb.sqlite. //copy the database to documents NSFileManager *fileManager = [NSFileManager defaultManager]; NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *path = [documentsDirectory stringByAppendingPathComponent:@"mydb.sqlite"]; if(![fileManager fileExistsAtPath:path]) { NSData *data = [NSData dataWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingString:@"/mydb.sqlite"]]; [data writeToFile:path atomically:YES]; } Anyone know of a better way to do this. This seems to work ...

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• iPhone YouTube Channel App

  - by pki

  What would the steps be to creating an app that connected to YouTube's XML API. Here is my setup currently but it is not working. App Delegate creates object "YTXMLParser" App Delegate calls [parser prepAndPrase]; In Prep and Parse the app initiates a NSURLConnection The app downloads the XML Data using the NSURLConnection well appeneding to NSMutableData The app parses the data with NSXMLParser At the end of each "entry" the app adds the current dictionary to the class. At the beginning of each "entry" the app creates an instance of a dictionary. Here's where i'm stuck. How do I get this data back to my app delegate?

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• Terminating app due to uncaught exception / / SIGABRT // C++ please help!

  - by user282076

  I have just finished one of my apps when I got this message. I cannot for the life of me work out what is wrong. (gdb) continue 2010-02-26 14:05:51.443 BrainTester[2638:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] was unable to load a nib named "SplitSecondViewController"' 2010-02-26 14:05:51.452 BrainTester[2638:207] Stack: ( 861696817, 860329709, 861252493, 861252395, 835170725, 835170141, 835074651, 13515, 834774231, 834773467, 835014237, 835012689, 835011495, 861063661, 861449261, 861447005, 834770767, 834765939, 11025, 10920 ) terminate called after throwing an instance of 'NSException' Program r eceived signal: “SIGABRT”. (gdb) If someone can help, any help is appreciated.

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• iPhone development books

  - by hhafez

  I've looked on SO and it seems that most people have been recomending books as the best iphone development resource due to the lack of resources on the web. I've seen the book the The Pragmatic Programmer: iPhone SDK development been recomended a few times. I'm planning to go buy a couple of books. Which should I go for? Please give reason :) A bit of background : I have a strong background in C and I've played around with Cocoa so something iphone specific would be best ( but I'm open for suggestions ;)) Update I'm not looking for simple listings of iphone SDK related books, I can google that ;) I want books that people are reading/have read and would recomend :) Final Update I just ordered my copy of Beginning iPhone Development: Exploring the iPhone SDK. My main reasons on chosing it are that it's already in print (unlike the pragmatic one) and I looked at the preview on their website and I liked it.

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• iPhone: How do I override the back button in a Navigation Controller?

  - by Angelo Stracquatanio

  Hello, In my app I have a basic Navigation Controller. For all of my views, except one, the controller works as it should. However, for one view in particular, I would like the 'back' button to not go back to the previous view, but to go to one I set. In particular it is going to go back 2 views and skip over one. After doing some research I found that I can intercept the view when it disappears, so I tried to put in code to have it navigate to the page I would like: - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; //i set a flag to know that the back button was pressed if (viewPushed) { viewPushed = NO; } else { // Here, you know that back button was pressed mainMenu *mainViewController = [[mainMenu alloc] initWithNibName:@"mainMenu" bundle:nil]; [self.navigationController pushViewController:mainViewController animated:YES]; [mainViewController release]; } } That didn't work, so does anyone have any ideas? Thanks!!

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• Button to add value to array and then compare result with another array on IPhone.

  - by slickplaid

  I have ten buttons that each correspond to a different number. I'm looking to record the order that these buttons are pressed and enter them into an array and then compare it to another array that is static in the app. The check should be done on the Nth button press, where N equals the number of items in the other, static array. How do I A) have a button press add a value to an array B) stop after Nth button press equal to amount of numbers in the array I'm checking against and C) compare this array to the other array?

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• Wildcard App IDs for iPhone/iPod Touch Apps

  - by Can Berk Güder

  I'm writing my third app, and I already have an app in the App Store, but I still don't get this App ID business. I created the App IDs for my first two applications like this: XXXXXXXXXX.me.cbg.FirstApp YYYYYYYYYY.me.cbg.SecondApp but then Apple introduced the App ID wizard, which I used to create the App ID and provisioning profiles for my third application: ZZZZZZZZZZ.* So my question is: What is the "proper" way of creating App IDs for three completely independent apps? Should I use the XXXXXXXXXX.* format or XXXXXXXXXX.me.cbg.*? Should I create three different App IDs, or just one wildcard ID?

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• Fullcalendar on IPhone

  - by Iphone novice

  Hello all, Is it possible to use fullcalendar on iphone native app reading events from servlet on a remote server? Features required are Month, Week and Day view. No need of adding, editing or deleting events. Clicking on event display the summary of the event. I would be very happy if fullcalendar is capable of the same, if no what are the other solutions. Expecting your guidance. Thanks in advance

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