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• [IOS SDK] retrieving scores from game center

  - by Sam

  I got this code from apple's developer site. How do i process the score information to be viewed in a like a UITableView or something? (void) retrieveTopTenScores { GKLeaderboard *leaderboardRequest = [[GKLeaderboard alloc] init]; if (leaderboardRequest != nil) { leaderboardRequest.playerScope = GKLeaderboardPlayerScopeGlobal; leaderboardRequest.timeScope = GKLeaderboardTimeScopeAllTime; leaderboardRequest.range = NSMakeRange(1,10); [leaderboardRequest loadScoresWithCompletionHandler: ^(NSArray *scores, NSError *error) { if (error != nil) { // handle the error. } if (scores != nil) { // process the score information. } }]; } }

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• iphone OCMockObject and unit-testing a class that inherits from NSURLConnection

  - by Justin Galzic

  I want to unit test the custom init method of a class that inherits from NSURLConnection -- how would I do this if the init of my testable class invokes NSURLConnection's initWithRequest? I'm using OCMock and normally, I can mock objects that are contained within my test class. For this inheritance scenario, what's the best approach to do this? - (void)testInit { id urlRequest = [OCMockObject mockForClass:[NSURLRequest class]]; MyURLConnectionWrapper *conn = [[MyURLConnectionWrapper alloc] initWithRequest:urlRequest delegate:self someData:extraneousData]; } My class is implemented like this: @interface MyURLConnectionWrapper : NSURLConnection { } - (id)initWithRequest:(NSURLRequest *)request delegate:(id)delegate someData:(NSString *)fooData @end @implementation MyURLConnectionWrapper - (id)initWithRequest:(NSURLRequest *)request delegate:(id)delegate someData:(NSString *)fooData { if (self = [super initWithRequest:request delegate:delegate]) { // do some additional work here } return self; } Here's the error I get: OCMockObject[NSURLRequest]: unexpected method invoked: _CFURLRequest

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• 'NSInvalidArgumentException' UIButton IBAction Error

  - by Graeme

  Hi, I have a button in a view which refuses to work. I've got in working in a blank, default view application from X-Code, but in none of my applications will it work, instead it gives me the following error. Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[UIViewController showVicInfo:]: unrecognized selector sent to instance 0x3c084f0' The debugger isn't any help either. I've made sure that I hook up the button to the file's owner (not the other way around) as well. Below is the code for the action. And I know it's not the alert view, because the breakpoint doesn't even reach there. about.h @interface about : UIViewController { } -(IBAction)showInfo:(id)sender; about.m -(IBAction)showVicInfo:(id)sender { UIAlertView *myAlert = [[UIAlertView alloc] initWithTitle:@"No Internet Connection" message:@"You require an internet connection via WiFi or cellular network for iFirelert to work." delegate:self cancelButtonTitle:@"OK, thanks" otherButtonTitles:nil]; [myAlert show]; [myAlert release]; }

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• iPhone modalView unwanted offset

  - by Chonch

  Hey, I have a UITabBarController with three view controllers (from three different types). On one of the view controllers, I want to display a modalViewController. Once a UIButton on the screen is pressed, I perform this action: AboutViewController *modalViewController = [[AboutViewController alloc] initWithNibName:@"AboutScreen" bundle:nil]; [self presentModalViewController:modalViewController animated:YES]; like I always do in order to display a modal view... The problem is, that while the modal view is being displayed (while it is moving from the bottom of the screen), a 20 pixels grey strip is showing on the bottom of the screen (the same size as the status bar on the top). Once the modal view reaches its final location, the strip disappears. Needless to say this doesn't look good (to say the least). Does anybody know why this may happen? Thanks,

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• Memory issue regarding UIImageView on IPhone 4.0 / IPad

  - by Sagar Mane

  Hello All, My Application is crashing due to low memory [ Received memory warning level 1 + 2] To trace this I have used Instrument and come with following points Test Enviorment : Single view controller added on Window When I don't use UIImageView Real Memory is used 3.66 MB When I uses UIImageView with Image having size 25 KB : Real Memory is used 4.24 MB. almost 560 KB extra when compare to w/o UIImageView and which keep on adding as I am adding more UIImageview on the view. below is sample code for adding UIImageview which I am refering UIImageView* iSplashImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Default-Landscape.png"]]; iSplashImage.frame = CGRectMake(0, 0, 320, 480); [self.window addSubview:iSplashImage]; AND dealloc if(iSplashImage) { [iSplashImage release]; iSplashImage = nil; } Issue is this 560 KB is not getting release and after some time application receives low memory warning. Can anyone point out if I am missing something or doing else. As My application uses lots of Images in One session. Thanks in Advance, Sagar

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• Custom UITableViewCell not properly hiding views

  - by adamweeks

  I am using apple's custom table view cell code and modifying the drawRect code within the cell's view to look like I want it to. I've changed it to have some UILabels as well as a UIProgressView. If the data the cell is being built on doesn't have a certain field, I want the UIProgressView to be hidden. This works for a little while, but when a cell gets requeued, the progress view will start displaying again, even when I set it to hidden = YES. I've tried just not creating the ProgressView unless the data was there and that didn't work either. I thought the answer was in the [self setNeedsDisplay] but that doesn't seem to help. Here is the code for the progressview from drawRect that continues to be displayed: UIProgressView *c1Progress = [[UIProgressView alloc]initWithFrame:CGRectMake(20.0, 70.0, 280.0, 12.0)]; float iProgress = (value / target); c1Progress.progress = iProgress; if (!dataExists) { c1Progress.hidden = YES; } [self addSubview:criteria1Progress]; [c1Progress release];

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• Adding # & search sign to TableIndex in UITableView

  - by sagar

  In iPhone native Phone book - there is a search character at the top & # character at the bottom. I want to add both of that character in my table Index. Currently I have implemented following code. atoz=[[NSMutableArray alloc] init]; for(int i=0;i<26;i++){ [atoz addObject:[NSString stringWithFormat:@"%c",i+65]]; } - (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{ return atoz; } How to have # character & search symbol in my UITableView? Thanks in advance for sharing your knowledge. Sagar

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• CFNetwork / NSURLConnection leak

  - by JK

  Running instruments on the device, I intermittently incur a memory leak of exactly 3.5 KB in CFNetwork, the responsible frame being "HostLookup_Master::HostLookup...." I have read a number of questions re this issue and have separately tried the following to fix the leak: Included the following in applicationDidFinishLaunching: NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil]; [NSURLCache setSharedURLCache:sharedCache]; [sharedCache release]; Specified in the urlrequest not to load from the local cache. None of the above worked. My class that instantiates the connections does not leak as its instances are released when data has been downloaded. I have verified this by confirming the the living objects of the class is 0 using Instruments. Any advice on addressing this leak would be greatly appreciated.

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• Incorrect value for sum of two NSIntegers

  - by Antonio

  Hi everybody: I'm sure I'm missing something and the answer is very simple, but I can't seem to understand why this is happening. I'm trying to make an average of dates: NSInteger runningSum =0; NSInteger count=0; for (EventoData *event in self.events) { NSDate *dateFromString = [[NSDate alloc] init]; if (event.date != nil) { dateFromString = [dateFormatter dateFromString:event.date]; runningSum += (NSInteger)[dateFromString timeIntervalSince1970]; count += 1; } } if (count>0) { NSLog(@"average is: %@",[NSDate dateWithTimeIntervalSince1970:(NSInteger)((CGFloat)runningAverage/count)]); } Everything seems to work OK, except for runningSum += (NSInteger)[dateFromString timeIntervalSince1970], which gives an incorrect result. If I put a breakpoint when taking the average of two equal dates (2009-10-10, for example, which is a timeInterval of 1255125600), runningSum is -1784716096, instead of the expected 2510251200. I've tried using NSNumber and I get the same result. Can anybody point me in the right direction? Thanks! Antonio

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• UIImagepickerController strange bug

  - by Rahul Vyas

  Hi, I'm doing something with UIImagePickerController. It works fine and the Picture browser does open, however, I get this message. "Failed to save the videos metadata to the filesystem. Maybe the information did not conform to a plist." What could be causing that? That is caused by this line [self presentModalViewController:self.imgPicker animated:YES]; which is activated on a button click Snippets of the code that I have below. - (void)viewDidLoad { self.imgPicker = [[UIImagePickerController alloc] init]; self.imgPicker.allowsImageEditing = YES; self.imgPicker.delegate = self; } - (IBAction)grabImage { [self presentModalViewController:self.imgPicker animated:YES]; } it's also removing images from documents directory and from resources folder. I can not understand why? does someone found the solution to this?

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• How do I set an Array in one class with another array in another class in Objective-C

  - by Stef

  Hi Guys, I've populated and array with data like this in one class... PowerClass .h NSMutableArray pickerArray; @property (nonatomic, retain) NSMutableArray pickerArray; - PowerClass .m @synthesize pickerArray; @implementation NSMutableArray *array = [[NSArray alloc] initWithObjects:@"stef", @"steve", @"baddamans", @"jonny", nil]; pickerArray = [NSMutableArray arrayWithArray:array]; And I'm trying to set the Array in another class WeekClass .h PowerClass *powerClass; NSMutableArray *pickerData; @property (nonatomic, retain) NSMutableArray pickerData; @property (nonatomic, retain) PowerClass *powerClass; WeekClass .m @implementation pickerData = [NSMutableArray arrayWithArray:powerClass.pickerArray]; I have no errors or warnings. It just crashes. The NSLog says that the powerClass.PickerArray is Null... I don't know why this is... Please help point me in the right direction... Thanx guys Stef :-)

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• Change the text of a UILabel in viewDidLoad() programmatically

  - by HelloWorld

  Hi everybody. I'm a beginneri iPhone developer. My code is the following: - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) { displayLabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 20, 230, 40)]; [self.view addSubview:displayLabel]; } return self; } // - (void)viewDidLoad { [super viewDidLoad]; displayLabel.text = @"abc"; } I want to change the label text in viewDidLoad methond,but it can't change label text. I hope i explained my scenario. Sorry for my English. Greetings, dy.

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• is it possible to request UIWebView using user agent as Safari on iPhone?

  - by RAGOpoR

  i try to request on my application via this url http://reader.mac.com/mobile/v1/http%3A%2F%2Ffeeds.feedburner.com%2F9To5Mac-MacAllDay and it also return that it available on iPhone only how can i fix it? mycode NSMutableURLRequest *urlRequest = [[NSMutableURLRequest alloc] initWithURL: [NSURL URLWithString: myurl]]; [urlRequest setValue: @"iPhone" forHTTPHeaderField: @"Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16"]; [self.myWebView loadRequest:urlRequest];

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• Call javascript from objective-c, only works with system functions like alert() etc / phonegap

  - by adrian

  hi havent found the solution yet in the forum. i want to call a function i created in the index.html via a objective-c function. As explained in stringByEvaluatingJavaScriptFromString so the network detection doesnt work for me the function gets called but no javascript is called in the index.html here is the code i use - (void)updateReachability:(NSString*)callback { NSString* jsCallback = @"navigator.network.updateReachability"; if (callback) jsCallback = callback; NSString* status = [[NSString alloc] initWithFormat:@"%@({ hostName: '%@', ipAddress: '%@', remoteHostStatus: %d, internetConnectionStatus: %d, localWiFiConnectionStatus: %d });", jsCallback, [[Reachability sharedReachability] hostName], [[Reachability sharedReachability] address], [[Reachability sharedReachability] remoteHostStatus], [[Reachability sharedReachability] internetConnectionStatus], [[Reachability sharedReachability] localWiFiConnectionStatus]]; [webView stringByEvaluatingJavaScriptFromString:status]; [status release]; } If i log the status the string i see can be executed in the index.html file, the syntax is ok. but it doesnt get called if i do alert( etc... it gets called... need some help pls, because network detection is a kill criteria to publish a app!!! Adrian

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• iPad UIViewController loads as portrait when device is in landscape

  - by jud

  I have an application with 3 view controllers. They are all have shouldAutoRotateToInterfaceOrientation returning YES. The first two, my main menu and my submenu both autorotate just fine. The third viewcontroller, which programatically loads a UIImageView from a jpg file in the program's bundle, will only display in portrait. In the viewcontroller containing the image, i have this: NSString *imageName = [NSString stringWithFormat:@"%@-00%d.jpg",setPrefix,imageNumber]; UIImageView *pictureView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:imageName]]; pictureView.frame = CGRectMake(0, 0, 1024, 768); [self.view addSubview:pictureView]; and again, I have shouldAutoRotateToInterfaceOrientation returning YES for all orientations. My image shows up, but is sideways, and the 0,0,1024,768 values I used to make my rectangle start from the top right corner going down, instead of starting at the top left and going across (holding in landscape). Am I missing a parameter I need to set in order to ensure the imageview shows up in landscape instead of portrait?

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• UITouches not detecting.

  - by Tony

  Hi, My UItouches is not detecting in my Slideshow nib file. What is the problem? Can anyone help? @class Slideshow; @interface RootViewController : UIViewController{ PreferencesController *preferencesController; Slideshow *slideshow;} Slideshow Implementation @implementation Slideshow - (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event { NSLog(@"touches begin"); } - (void)viewDidLoad { UIImageView *frontView = [[UIImageView alloc] initWithFrame:self.view.bounds]; frontView.backgroundColor = [UIColor blackColor]; frontView.image = [UIImage imageNamed:@"apple.png"]; frontView.userInteractionEnabled = YES; [self.view addSubview:frontView]; [frontView release]; }@end

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• Change NSNumber value by allocating new NSNumber?

  - by Peter Hajas

  I understand that NSNumber is immutable, but I still have the need to change it in my app. I use it because it's an object, and therefore usable with @property (if I could, I would use float or CGFloat in a heartbeat, but sadly, I can't). Is there any way to just overwrite the old NSNumber instance? I'm trying this: NSNumber *zero = [[NSNumber alloc] initWithFloat:0.0]; myNSNumber = zero but this doesn't change the value. This is a simplified version of my code, as I'm changing the root view controller's parameter (I know, not MVC-friendly). Still, the changing of the value should be the same assignment, right? Should I release myNSNumber first? What should I set the @property at for myNSNumber? Thanks!

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• Decimal numbers works in iPhone simulator but NOT on iPhone device

  - by matsoftware

  Hi everybody, I noticed a weird behaviour of iPhone OS when using decimal values. The simulator parse them from strings in a correct way but when I test the app on my iPhone it lose the decimal part. In particular, I store values in a dictionary that I retrieve in this way: Code: NSString *thickStr = [dictionary valueForKey:@"thickness"]; NSNumber *thickNum = [[[self class] numberFormatter] numberFromString:thickStr]; [self setSpessore:thickNum]; where the "numberFormatter" class is defined as below: Code: + (NSNumberFormatter *)numberFormatter { static NSNumberFormatter *_formatter; if (_formatter == nil) { _formatter = [[NSNumberFormatter alloc] init]; [_formatter setNumberStyle:NSNumberFormatterDecimalStyle]; [_formatter setFormatterBehavior:NSNumberFormatterBehavior10_4]; [_formatter setGeneratesDecimalNumbers:TRUE]; } return _formatter; } But it doesn't work! The App on iPhone keeps on convert the string to a simple integer, forgetting the decimal part, while the app on iPhone simulator works fine!

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• Weird in my UIImagePickerController with camera

  - by Chun

  Hi everyone: I met a problem on using camera by scratch on iphone. Other people's code just run fine on my 3GS. But my code doesn't. When I implemented a UIViewController controller, and I add the following code in viewdidload: UIImagePickerController *picker = [UIImagePickerController alloc] init]; picker.source = UIImagePickerControllerSourceTypeCamera; picker.delegate = self; //Previously added all the delegate properly [self presentModalViewController:picker animated:YES]; Nothing comes out. I checked in the debugger, it shows that the picker is allocated, but here is the major difference between my and success one. picker._imagepickerflag.visible = 0; //others show 1; picker.UINavigationController._containerView: 0x0 ; // others have value. Can anyone help me on this, is there something wrong? Thank you.

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• passing user from UITableView to UIWebView based on selection

  - by ct2k7

  Hello, I'm trying to pass the user on to the interface based on their cell selection in the UITableView, ie, if the user selects cell 1, they are taken to view model 2, containing UIWebView. UIWebView then displays local file, cell1.html. Currently, I've manage to get placeholder using: selectedCellText.text = selectedCell; to display the name of the cell selected. How do I get it to directly pass to the UIWebView, stick UIWebView in the interface and link it using: UIWebView *myWebView = [[UIWebView alloc] initWithFrame:frame]; NSBundle *mainBundle = [NSBundle mainBundle]; NSString *stringUrl = [mainBundle pathForResource:@"selectedCell" ofType:@"html"]; NSURL *baseUrl = [NSURL fileURLWithPath:stringUrl]; NSURLRequest *urlRequest = [NSURLRequest requestWithURL:baseUrl]; [myWebView loadRequest:urlRequest]; My other issue is that some of the cell names have spaces in them, and for simplicity, I'd like to ensure that there are no spaces (actually, will it even work with spaces in the name, I assume with %20 ? Thanks

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• Handling credit cards and IOS

  - by Susan Jackie

  I am using NSUrlConnection asyncronous request to transmit credit card information to a secure third party server. I do the following: I get the credit card number, cvv, etc from the uitextfields. Encode the credit card information into a json format. Set as httpd body of the nsurlconnection request as follows: NSURL * url = [[NSURL URLWithString: "https://www.example.com"]; NSMutableURLRequest * request = [[NSMutableURLRequest alloc] initWithURL: url]; [request setHTTPMethod: @"POST"]; [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"]; [request setHTTPBody: [NSJSONSerialization dataWithJSONObject: params options: kNilOptions error: &parseError]]; Send this information via asynchronous request to a secure third party server: [NSURLConnection sendAsynchronousRequest:request queue: queue completionHandler:^(NSURLResponse *response, NSData *data, NSError * requestError) { What should I be considering to send user credit card information to a third party server using nsurlconnection asynchronous request?

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• How can I pop a view from a UINavigationController and replace it with another in one operation?

  - by Matt Brandt

  I have an application where I need to remove one view from the stack of a UINavigationController and replace it with another. The situation is that the first view creates an editable item and then replaces itself with an editor for the item. When I do the obvious solution within the first view: MyEditViewController *mevc = [[MYEditViewController alloc] initWithGizmo: gizmo]; [self retain]; [self.navigationController popViewControllerAnimated: NO]; [self.navigationController pushViewController: mevc animated: YES]; [self release]; I get very strange behavior. Usually the editor view will appear, but if I try to use the back button on the nav bar I get extra screens, some blank, and some just screwed up. The title becomes random too. It is like the nav stack is completely hosed. What would be a better approach to this problem? Thanks, Matt

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• Error Playing video from server with MPMoviePlayerController

  - by skiria

  I try to play a video on the server with this code. I have a error. //Play the video from server - (IBAction)playVideo:(id)sender; { NSLog(@"URLVIDEO %@", aVideo.urlVideo); MPMoviePlayerController *VideoPlayer = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL URLWithString:aVideo.urlVideo]]; [VideoPlayer play]; } //Error on con console Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Content URL must not be nil.' aVideo.urlVideo is a NSString and it's correct when I copy the result on the NSLog on the browser.

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• CoreData many-to-many relationship NSPredicate Exceptions

  - by user307550

  I'm trying to model a Person/Team relationship. It's a many to many relationship since a person can belong to multiple teams and a team can have multiple people. As suggested by the doc I created an intermediate entity called TeamMember. I am now trying to run a query to see if I have a list of people, whether a pre-existing Team already exists for them so I'm not storing duplicate Teams in the database NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Team" inManagedObjectContext:[pm managedObjectContext]]; [request setEntity:entity]; NSPredicate *predicate = nil; predicate = [NSPredicate predicateWithFormat:@"ALL %K IN %@", @"teamMembers.person", players]; players is an NSSet of people that I'm trying to search I'm getting the following exception: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unsupported predicate ALL teamMembers.person IN { (entity: Person; id: 0x1334470 ; data: { Ideally I would like them to match exactly and not just do an IN as well. Any help would be greatly appreciated

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• How UIWindow#addSubview can make memory leak?

  - by Jakub

  Hello, I started to learn using Instrument, but I cannot figure it out. After I start my application, the UI shows up, I do nothing and after few seconds I can see memory leak detected: When I have a look at the second leak I can see the following stack: When I double click on the cell related to my code I can see that it is pointing to the following line of code: [window addSubview:newPostUIViewController.view]; from the method: - (void)applicationDidFinishLaunching:(UIApplication *)application { //creating view controller newPostUIViewController = [[NewPostUIViewController alloc] initWithNibName:@"NewPostView" bundle:nil]; newPostUIViewController.title = @"Post it!"; [window addSubview:newPostUIViewController.view]; // Override point for customization after application launch [window makeKeyAndVisible]; } I wonder, how this can be a reason of a leak? I release newPostUIViewController in the dealloc method of PostItAppDelegate class. Any ideas how this could be explained?

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