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  • requestAccessToEntity for both iOS6 and 5.x - EKEventStore

    - by ShiShi
    following iOS6 eventKit and the new privacy settings I am using the following code - which works perfectly fine on iOS6 devices. Still, I would like the same code to work also for devices with iOS 5.x and I wish not to write a the "same code" twice - Seems wrong. Can anyone assist in an elegant solution ? EKEventStore *eventStore = [[EKEventStore alloc] init]; [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) { // some code }];

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  • How to convert the date string into string( yyyy-MM-dd). While doing so, I getting null values ?

    - by Madan Mohan
    Hi, I have the data as customerFromDate " 01 Apr 2010 " and customerToDate " 30 Apr 2010 " which is a string. I want to convert that format into yyyy-MM-dd it should be in string. but while doing so. I got null values. Please see the following code which I had tried. printf("\n customerFromDate %s",[customerStatementObj.customerFromDate UTF8String]); printf("\n customerToDate %s",[customerStatementObj.customerToDate UTF8String]); /* prints as the following customerFromDate 01 Apr 2010 customerToDate 30 Apr 2010 */ NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; [dateFormatter setDateFormat:@"yyyy-MM-dd"]; NSDate *fromDate=[[NSDate alloc]init]; fromDate = [dateFormatter dateFromString:customerStatementObj.customerFromDate]; printf("\n fromDate: %s",[fromDate.description UTF8String]); NSString *fromDateString=[dateFormatter stringFromDate:fromDate]; printf("\n fromDateString: %s",[fromDateString UTF8String]); [dateFormatter release]; NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init]; [dateFormatter1 setDateFormat:@"yyyy-MM-dd"]; NSDate *toDate=[[NSDate alloc]init]; toDate = [dateFormatter1 dateFromString:customerStatementObj.customerToDate]; printf("\n toDate: %s",[toDate.description UTF8String]); NSString *toDateString=[dateFormatter1 stringFromDate:toDate]; printf("\n toDateString: %s",[toDateString UTF8String]); [dateFormatter1 release]; Thank you, Madan Mohan.

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  • How to auto-scroll UITableView?

    - by Sheehan Alam
    I am trying to do something interesting. I am pulling some JSON data and populating cells in a UITableView. How can I make the UITableView scroll ever second or so? I want to give the effect that as new data is coming in, the table is scrolling, so it is streaming. Any ideas?

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  • save and restore state of a tab bar controller

    - by phunehehe
    I have an application that has a UITabBarController with two tabs, each having its own navigation controller. Now I want to store the state of the application when the user closes it, so that when the user relauches the application will show the same place as the last time before it was closed. So, in applicationWillTerminate: I have [NSKeyedArchiver archiveRootObject:tabBarController toFile:@"lastVisitedTab"]; Then, in applicationDidFinishLaunching: I have UITabBarController *last= (UITabBarController *)[NSKeyedUnarchiver unarchiveObjectWithFile:@"lastVisitedTab"]; if (last) tabBarController = [last retain]; I also have an extension to UIImage to make it compliant to NSCoding. However, this doesn't work, as the state is not preserved. The first tab gets selected all the time, and no navigation is preserved either. Can someone tell me what's wrong, or show me how to do it correctly?

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  • NSTableView Drag and Drop not working

    - by macatomy
    Hi, I'm trying to set up very basic drag and drop for my NSTableView. The table view has a single column (with a custom cell). The column is bound to an NSArrayController, and the array controller's content array is bound to an NSArray on my controller object. The data displays fine in the table. I connected the dataSource and delegate outlets of the table view to my controller object, and then implemented these methods: - (BOOL)tableView:(NSTableView *)aTableView writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard *)pboard { NSLog(@"dragging"); return YES; } - (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(id <NSDraggingInfo>)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)op { return NSDragOperationEvery; } - (BOOL)tableView:(NSTableView *)aTableView acceptDrop:(id <NSDraggingInfo>)info row:(NSInteger)row dropOperation:(NSTableViewDropOperation)operation { return YES; } I also registered the drag types in -awakeFromNib: #define MyDragType @"MyDragType" - (void)awakeFromNib { [super awakeFromNib]; [_myTable registerForDraggedTypes:[NSArray arrayWithObjects:MyDragType, nil]]; } The problem is that the -tableView:writeRowsWithIndexes:toPasteboard: method is never called. I've looked at a bunch of examples and I can't figure out anything I'm doing wrong. Could the problem be that I'm using a custom cell? Is there something I'm supposed to override in the cell subclass to enable this functionality? EDIT: Confirmed. Switching the custom cell for a regular NSTextFieldCell made dragging work. Now, how do I make drag and drop work with my custom cell?

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  • Clear UITextField when standard number pad is pressed

    - by Manu
    Hi all, I'm sorry if I didn't explain my problem well enough in the title. In my application, I'm using a small subview to create a very basic calculator on the top side of the screen (I just have an UITextField to show the operations and two buttons). Instead of using a custom keyboard for it, I want to use the standard iPhone number pad. My problem is that after doing an operation (e.g. adding two numbers) and showing the result, I cannot figure out how to clear the screen when the user enters a new number. So, for example: User enters "6" - Number 6 is shown in UITextField User selects "+" - UITextField is cleared to make room for the next number User enters "10" - Number 10 is shown in UITextField User selects "+" - 16 is shown as the result of the previous operation, and should stay there until another number is pressed (he wants to continue adding more numbers) User enters "5" At this point, if I was using a custom keyboard, I could clear the UITextField as soon as the button "5" is pressed by the user, but I cannot figure out how to do so when using the standard number pad. So, the result I get at the moment is "165". Is there a way to detect when a key is pressed in the standard number pad so that I can clear the UITextField before the new number appears? I thought there may be a NSNotification for that, but I couldn't find it. I'm aware that I could solve my problem if I created a custom keyboard or if I used two separated UITextFields (one for the operations and another one for the total), but I would like to use the standard number pad if it's possible. Thanks very much!

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  • Facebook App Wall Posting no longer showing in Facebook iPhone App

    - by David Hsu
    I use the GRAPH API with django for Facebook wall postings. Since yesterday, the wall posts only show on the Facebook web app but not the Facebook iPhone app. I tried Yelp, and their postings still show up. How can I debug this? Anyone notice this issue with their Facebook connect? Is this a Facebook algorithm issue. Code for Wall Post: graph = facebook.GraphAPI(access_token) attachment = {"name": name, "link": link, #"caption": "{*actor*} posted a new review", "description": desc, "picture": picture } graph.put_wall_post("",attachment)

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  • PerformSelectorInBackground leaking on device

    - by Oysio
    While it seems to not pose a problem on the simulator, using performSelectorInBackground on the device causes memory leaks. Or at least that's what Instruments indicates. Looking at the code I don't have a single clue what the cause could be. I tried to strip the affected code to a bare minimum but still strangely Instruments keeps showing a leak every time this piece of code is executed. Anything unusual going on here? //In viewcontrollerA: -(void)mainLoop { [self.viewControllerB performSelectorInBackground:@selector(calculateTotals) withObject:nil]; //This gives the same problem //[NSThread detachNewThreadSelector:@selector(calculateTotals) toTarget:self.viewControllerB withObject:nil]; //UI stuff ... } //viewControllerB: -(void)calculateTotals { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; //Heavy calculations ... [pool release]; }

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  • iphone-AVAudio Player Crashes

    - by user2779450
    I have an app that uses an avaudio player for two things. One of them is to play an explosion sound when a uiimageview collision is detected, and the other is to play a lazer sound when a button is pressed. I declared the audioplayer in the .h class, and I call it each time the button is clicked by doing this: NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"/lazer" ofType:@"mp3"]]; NSError *error; audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; if (error) { NSLog(@"Error in audioPlayer: %@", [error localizedDescription]); } else { [audioPlayer prepareToPlay]; } [audioPlayer play]; This works fine, but after many uses of the game, the audio will stop play when i hit the button, and when a collision is detected, the game crashes. Here is my crash log: 2013-09-18 18:09:19.618 BattleShip[506:907] 18:09:19.617 shm_open failed: "AppleAudioQueue.41.2619" (23) flags=0x2 errno=24 (lldb) Suggestions? Could there be something to do with repeatedly creating an audio player? Alternatives maybe?

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  • What's a good way to remove all of the subviews of a UIScrollView?

    - by Moshe
    I have a scroll view and I need to reload the contents often while my app is running. Right now, I'm using the following line of code to remove the subviews before adding them back again: [scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)]; Should I be using the following instead? scrollView.subviews = nil; For some reason, the (first) above line of code seems to crash the app every 16 times it is run. Am I leaking memory somewhere? The following method takes an array of views, the scroller (which is a constant) and the direction. Edit: - (void)loadViews:(NSArray *)views IntoScroller:(UIScrollView *)scroller withDirection:(NSString *)direction{ //Set up the scrollView [scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)]; if([direction isEqualToString:@"horizontal"]){ scrollView.frame = CGRectMake(0, 0, 1024, 768); scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * [[NSNumber numberWithUnsignedInt:[views count]] floatValue], scrollView.frame.size.height); }else if([direction isEqualToString:@"vertical"]){ scrollView.frame = CGRectMake(0, 0, 1024, 768); scrollView.contentSize = CGSizeMake(scrollView.frame.size.width, scrollView.frame.size.height * [[NSNumber numberWithUnsignedInt:[views count]] floatValue]); } for (int i=0; i<[[NSNumber numberWithUnsignedInt:[views count]] intValue]; i++) { [[[views objectAtIndex:[[NSNumber numberWithInt:i] unsignedIntValue]] view] setFrame:scrollView.frame]; if([direction isEqualToString:@"horizontal"]){ [[[views objectAtIndex:[[NSNumber numberWithInt:i] unsignedIntValue]] view] setFrame:CGRectMake(i * [[views objectAtIndex:[[NSNumber numberWithInt:i] unsignedIntValue]] view].frame.size.width, 0, scrollView.frame.size.width, scrollView.frame.size.height)];//CGRectMake(i * announcementView.view.frame.size.width, -scrollView.frame.origin.x, scrollView.frame.size.width, scrollView.frame.size.height)]; }else if([direction isEqualToString:@"vertical"]){ [[[views objectAtIndex:[[NSNumber numberWithInt:i] unsignedIntValue]] view] setFrame:CGRectMake(0, i * [[views objectAtIndex:[[NSNumber numberWithInt:i] unsignedIntValue]] view].frame.size.height, scrollView.frame.size.width, scrollView.frame.size.height)]; } [scrollView addSubview:[[views objectAtIndex:[[NSNumber numberWithInt:i] unsignedIntValue]] view]]; } }

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  • UIDatePicker in UIDatePickerModeCountDownTimer mode: how to get/set the hours and minutes via code?

    - by R31n4ld0
    Hello, guys. How to get/set the hours and minutes via code from a UIDatePicker in UIDatePickerModeCountDownTimer mode? The situation: I have an interface in that a user selects just hours and minutes. Then, he saves the information (so, I have to get the hours and minutes from UIDatePicker via code to save in a DB). When the user is editing the information saved previously, I want to start the interface with the saved hours/minutes (so, I have to set the UIDatePicker hours and minutes retrieved from DB via code). How do I do that with the UIDatePiker in UIDatePickerModeCountDownTimer mode? Thanks in advance.

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  • Trying to compile MobileSubstrate addon - Undefined symbol

    - by eWolf
    Hi! I went through this tutorial to create a MobileSubstrate addon. I could compile the example hook without errors. But as soon as I add #import <SpringBoard/SBAwayController.h> in ExampleHookProtocol.h and SBAwayController *awayController = [SBAwayController sharedAwayController]; in ExampleHookLibrary.mm (as the first line of the __$ExampleHook_AppIcon_Launch function) I get the following error message when attempting to make (triggered by the latter change): Undefined symbols: "_OBJC_CLASS_$_SBAwayController", referenced from: __objc_classrefs__DATA@0 in ExampleHookLibrary.o ld: symbol(s) not found collect2: ld returned 1 exit status make: *** [ExampleHook.dylib] Error 1. The header file for SBAwayController is located in /var/toolchain/sys30/usr/include/SpringBoard, just like SBApplicationIcon.h, which is used by the ExampleHook. I'm compiling on my iPod touch 2G. Can anyone help me? Thanks in advance, Eric

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  • How to use NSString drawInRect to centre text?

    - by Steve Folly
    How can I draw a string centred within a rect? I've started off with: (an extract from the drawRect method of my custom view) NSString* theString = ... [theString drawInRect:theRect withAttributes:0]; [theString release]; Now I'm assuming I need to set up some attributes. I've had a look through Apple's Cocoa documentation, but it's a bit overwhelming and can't find anything for how to add paragraph styles to the attributes. Also, I can only find horizontal alignment, what about vertical alignment? Thanks.

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  • Adding two NSDate

    - by niklassaers
    Hi guys, I've got two NSDate, date and time. I'd like to add them in such a manner that I get the date from date and time from time. Any suggestions on how I do this? Cheers Nik

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  • Iphone SDK array initlised at viewdidload and released at dealloc is causing leak?

    - by Skeep
    Hi All, I am new to iphone development and i am getting ready to submit my first app. I have an array initlised at viewdidload and released at dealloc, however it is causing a leak. My question is why would this happen is it because the dealloc has not run? My Code is as follows the NSMutableArray called listOfItems is referenced in my .h file for the UITableView. The listOfItems array is used to populate the table. In the viewDidLoad method i have this code listOfItems = [[NSMutableArray alloc] init]; and in the dealloc i have: [listOfItems release]; When watching leaks in instruments I get a NSArray leak which when I drill down points to the line: listOfItems = [[NSMutableArray alloc] init]; Am i putting all this in the right place? Thanks

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  • Simple CalendarStore query puts application into infinite loop!?

    - by Frank R.
    Hi, I've been looking at adding iCal support to my new application and everything seemed just fine and worked on my Mac OS X 10.6 Snow Leopard development machine without a hitch. Now it looks like depending on what is in your calendar the very simple query below: - (NSArray*) fetchCalendarEventsForNext50Minutes { NSLog(@"fetchCalendarEventsForNext50Minutes"); NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate]; NSDate* startDate = [[NSDate alloc] init]; NSDate* endDate = [startDate addTimeInterval: 50.0 * 60.0]; NSPredicate *eventsForTheNext50Minutes = [CalCalendarStore eventPredicateWithStartDate:startDate endDate:endDate calendars:[[CalCalendarStore defaultCalendarStore] calendars]]; // Fetch all events for this year NSArray *events = [[CalCalendarStore defaultCalendarStore] eventsWithPredicate: eventsForTheNext50Minutes]; NSLog( @"fetch took: %f seconds", [NSDate timeIntervalSinceReferenceDate] - start ); return events; } produces a beachball thrash even with quite limited events in the calendar store. Am I missing something crucial here? The code snippet is pretty much exactly from the documentation at: // Create a predicate to fetch all events for this year NSInteger year = [[NSCalendarDate date] yearOfCommonEra]; NSDate *startDate = [[NSCalendarDate dateWithYear:year month:1 day:1 hour:0 minute:0 second:0 timeZone:nil] retain]; NSDate *endDate = [[NSCalendarDate dateWithYear:year month:12 day:31 hour:23 minute:59 second:59 timeZone:nil] retain]; NSPredicate *eventsForThisYear = [CalCalendarStore eventPredicateWithStartDate:startDate endDate:endDate calendars:[[CalCalendarStore defaultCalendarStore] calendars]]; // Fetch all events for this year NSArray *events = [[CalCalendarStore defaultCalendarStore] eventsWithPredicate:eventsForThisYear]; It looks like it has something to do with the recurrence rules, but as far as I can see there are no other ways of fetching events from the calendar store anyway. Has anybody else come across this? Best regards, Frank

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  • Understanding byte order and functions like CFSwapInt32HostToBig

    - by Typeoneerror
    I've got an enumeration in my game. A simple string message with an appended PacketType is being sent with the message (so it knows what to do with the message) over GameKit WIFI connection. I used Apple's GKRocket sample code as a starting point. The code itself is working fantastically; I just want to understand what the line with CFSwapInt32HostToBig is doing. What on earth does that do? and why does it need to do it? My guess is that it's making sure the PacketType value can be converted to an unsigned integer so it can send it reliably, but that doesn't sound all that correct to me. The documentation states "Converts a 32-bit integer from big-endian format to the host’s native byte order." but I don't understand what the means really. typedef enum { PacketTypeStart, // packet to notify games to start PacketTypeRequestSetup, // server wants client info PacketTypeSetup, // send client info to server PacketTypeSetupComplete, // round trip made for completion PacketTypeTurn, // packet to notify game that a turn is up PacketTypeRoll, // packet to send roll to players PacketTypeEnd // packet to end game } PacketType; // .... - (void)sendPacket:(NSData *)data ofType:(PacketType)type { NSLog(@"sendPacket:ofType(%d)", type); // create the data with enough space for a uint NSMutableData *newPacket = [NSMutableData dataWithCapacity:([data length]+sizeof(uint32_t))]; // Data is prefixed with the PacketType so the peer knows what to do with it. uint32_t swappedType = CFSwapInt32HostToBig((uint32_t)type); // add uint to data [newPacket appendBytes:&swappedType length:sizeof(uint32_t)]; // add the rest of the data [newPacket appendData:data]; // Send data checking for success or failure NSError *error; BOOL didSend = [_gkSession sendDataToAllPeers:newPacket withDataMode:GKSendDataReliable error:&error]; if (!didSend) { NSLog(@"error in sendDataToPeers: %@", [error localizedDescription]); } }

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  • Core Data (NSFetchedResultsController) displaying one row per section

    - by Urizen
    I have a CoreData application which uses NSFetchedResultsController. NSFetchedResultsController is useful in that it allows me to access the fetched objects more easily etc. but I find that I have problems with the following: I get a crash when I display a single row for each section (irrespective of the number of actual rows present) as a summary of the information in that section (e.g. showing a statistical analysis of the data contained in the fetched rows for that section). I understand that the NSFetchedResultsControllerDelegatemethods have to agree with the number of rows reported per section by the UITableView Delegate method but I would like to be able to fetch all of the records for each section without necessarily displaying each of the rows. The above causes me inconsistency crashes, when I try to insert or delete data for a section, which reports that the number of rows for each section is not as it should be given the number of insertions/deletions. Is there any way I can do what I'm trying to achieve? Thanks for any help.

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  • UIView Animation iPhone (obtaining information on the frame dynamically)

    - by Urizen
    I have a UIView called goalBar which is being animated by increasing the size of the frame according to a float value called destination: CGRect goalBarRect = CGRectMake(0, 0, destination, 29); [UIView beginAnimations:@"goal" context:nil]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDuration:2.0f]; goalBar.frame = goalBarRect; [UIView commitAnimations]; The animation works perfectly and the rectangular view increases its width over the course of the animation (from 0 to the value for destination). However, I wish to be able to extract the values for the frame of the UIView being animated (i.e. goalBar) as the animation takes place. By that I mean that I wish to place the value of the width for the animated frame in a separate UILabel so that the user sees a counter that provides the width of the UIView as it's being animated. Any help on how to do the above would be gratefully received.

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  • Apple Push Notifications With Foreign Accent Characters Not Receiving

    - by confeng
    I'm sending push notifications and when the message contains foreign characters (Turkish in my case) like I, s, ç, g... The message does not arrive to devices. Here's my code: $message = 'THIS is push'; $passphrase = 'mypass'; $ctx = stream_context_create(); stream_context_set_option($ctx, 'ssl', 'local_cert', 'MyPemFile.pem'); stream_context_set_option($ctx, 'ssl', 'passphrase', $passphrase); // Open a connection to the APNS server $fp = stream_socket_client( 'ssl://gateway.push.apple.com:2195', $err, $errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx); if (!$fp) exit("Failed to connect: $err $errstr" . PHP_EOL); echo 'Connected to Apple service. ' . PHP_EOL; // Encode the payload as JSON $body['aps'] = array( 'alert' => $message, 'sound' => 'default' ); $payload = json_encode($body); $result = 'Start'.PHP_EOL; $tokenArray = array('mytoken'); foreach ($tokenArray as $item) { // Build the binary notification $msg = chr(0) . pack('n', 32) . pack('H*', $item) . pack('n', strlen($payload)) . $payload; // Send it to the server $result = fwrite($fp, $msg, strlen($msg)); if (!$result) echo 'Failed message'.PHP_EOL; else echo 'Successful message'.PHP_EOL; } // Close the connection to the server fclose($fp); I have tried encoding $message variable with utf8_encode() but the message received as "THÝS is push". And other ways like iconv() didn't work for me, some of them cropped Turkish characters, some didn't receive at all. I also have header('content-type: text/html; charset: utf-8'); and <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> in my page. I don't think the problem appears while I set the value but maybe with pack() function. Any ideas to solve this without replacing characters with English?

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  • Remove UIViewController from UIScrollView?

    - by tobi
    Hi, i add different View with (setPageID) to a ScrollView, but know i get a Memory problem on rotaion and i want to remove the actualy not showed view... how can i do this or how can i remove the memory problem? Thanks!!! - (void)setPageID:(int)page { if (page < 0) return; if (page >= self.listOfItems.count) return; CGFloat cx = 0; ScrollingViewStep *controller = [viewControllers objectAtIndex:page]; if ((NSNull *)controller == [NSNull null]) { controller = [[ScrollingViewStep alloc] init]; [viewControllers replaceObjectAtIndex:page withObject:controller]; [controller release]; } if (nil == controller.view.superview) { if([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) { cx = 768.0 * page; controller.view.frame = CGRectMake(cx, 0.0 , 768.0f, 926.0f); } else { cx = 1024.0 * page; controller.view.frame = CGRectMake(cx, 0.0 , 1024.0f, 670.0f); } [controller setView:ItemID PageID:page Text:[[self.listOfItems objectAtIndex:page] objectForKey:@"step"]]; [scrollView addSubview:controller.view]; } } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { CGFloat cx2 = 0; for (int i = 0; i < [self.viewControllers count]; i++) { ScrollingViewStep *viewController = [self.viewControllers objectAtIndex:i]; if ((NSNull *)viewController != [NSNull null]) { if([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) { cx2 = 768.0 * i; viewController.view.frame = CGRectMake(cx2, 0.0 , 768.0f, 926.0f); [viewController repos]; } else { cx2 = 1024.0 * i; viewController.view.frame = CGRectMake(cx2, 0.0 , 1024.0f, 670.0f); [viewController repos]; } } } if((interfaceOrientation == UIInterfaceOrientationPortrait) || (interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)) { CGRect frame = scrollView.frame; frame.origin.x = 768 * currentPageInScrollview; frame.origin.y = 0; [scrollView scrollRectToVisible:frame animated:NO]; } else { CGRect frame = scrollView.frame; frame.origin.x = 1024 * currentPageInScrollview; [scrollView scrollRectToVisible:frame animated:NO]; } pageControlIsChangingPage = YES; return YES; } - (void)didReceiveMemoryWarning { int currentPage = currentPageInScrollview; NSLog(@"MEMORY"); // unload the views+controllers which are no longer visible UIViewController *l; for (int i = 0; i < [self.viewControllers count]; i++) { ScrollingViewStep* viewController = [self.viewControllers objectAtIndex:i]; if((NSNull *)viewController != [NSNull null]) { if(i < currentPage-1 || i > currentPage+1) { [self.viewControllers replaceObjectAtIndex:i withObject:[NSNull null]]; } } } [super didReceiveMemoryWarning]; }

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