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• PresentModalViewController problem.

  - by james.ingham

  I have a new view controller on the iPhone which I call using the following line of code: [self presentModalViewController:controller animated:NO]; This works great if animation is on, but I am looking to have an instant switch. The problem is when I set animation to NO, the whole view shifts 20px to the right (it is always in landscape mode) as if there is a status bar but in portrait mode!? In this example the yellow space is the new view controller. I've tried this in a new project and the same thing happens. It may be a bug but does anyone have a fix? Thanks

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• NULL value when using NSDateFormatter

  - by David A Gibson

  Hello, I am using the following code to try and display in a time in a table cell. TimeSlot *timeSlot = [timeSlots objectAtIndex:indexPath.row]; NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init]; [timeFormat setDateFormat:@"%1m/%1d/%Y"]; NSLog(@"Time: %@", timeSlot.time); NSDate *mydate = timeSlot.time; NSLog(@"Time: %@", mydate); NSString *theTime = [timeFormat stringFromDate:mydate]; NSLog(@"Time: %@", theTime); The log output is this: 2010-04-14 10:23:54.626 MyApp[1080:207] Time: 2010-04-14T10:23:54 2010-04-14 10:23:54.627 MyApp[1080:207] Time: 2010-04-14T10:23:54 2010-04-14 10:23:54.627 MyApp[1080:207] Time: (null) I am new to developing for the iPhone and as it all compiles with no errors or warnings I am at a loss as to why I am getting NULL in the log. Is there anything wrong with this code? Thanks

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• UIWebView - get total height of contents using Javascript

  - by Emil

  Hey. I'm trying to use a UIWebView for displaying content higher than the screen of the iPhone, without needing to scroll in the webView itself. For that, I need a way to get the total document size, including the scrollable area. I have tried a number of different Javascript solutions: (document.height !== undefined) ? document.height : document.body.offsetHeight // Returns height of UIWebView document.body.offsetHeight // Returns zero document.body.clientHeight // Returns zero document.documentElement.clientHeight // Returns height of UIWebView window.innerHeight // Returns height of UIWebView -2 Can you think of any other way to do it? Thanks.

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• Distributing APNS providers

  - by Sam

  I'm writing a business-focused iPhone app which includes a self-hosted server component. I'd like to include push notification functionality in the server; reading through the programming guide it looks as if this would involve either: Distributing the provider certificate with the server component - this doesn't sound like a terribly good idea (even if Apple permits it?) Hosting a shared notification provider and forwarding notifications to APNS from the servers. For an ongoing, high-availability service, this is likely to require including a subscription pricing component, which I would prefer to avoid. Require customers to apply for their own provider certificate. However, it's not clear whether multiple organisations are allowed to apply for provider certificates with a single bundle ID, and it would significantly increase the barrier to adoption. APNS looks to me as if it's specifically geared for centrally hosted services. Is anyone distributing self-hosted notification providers? Are there any other options?

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• How do i compile a static library (fat) for armv6, armv7 and i386

  - by unforgiven

  I know this question has been posed several times, but my goal is slightly different with regard to what I have found searching the web. Specifically, I am already able to build a static library for iPhone, but the final fat file I am able to build only contains arm and i386 architectures (and I am not sure to what arm refers: is v6 or v7?). I am not able to compile specifically for armv6 and armv7 and them merge both architectures using lipo. The lipo tool complains that the same architecture (arm, not armv6 or armv7) is present in both the armv6 and armv7 libraries. Can someone explain exactly how to build for armv6 and armv7, and them merge these libraries into a fat file using lipo?

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• Need advice on speeding up tableViewCell photo loading performance

  - by ambertch

  I have around 20 tableview cells that each contain a number (2-5) thumbnail sized pictures (they are VERY small Facebook profile pictures, ex. http://profile.ak.fbcdn.net/hprofile-ak-sf2p/hs254.snc3/23133_201668_2989_q.jpg). Each picture is an UIImageView added to the cell's contentview. Scrolling performance is poor, and measuring the draw time I've found the UIImage rendering is the bottleneck. I've researched/thought of some solutions but as I am new to iphone development I am not sure which strategy to pursue: preload all the images and retrieve them from disk instead of URL when drawing cells (I'm not sure if cell drawing will still be slow, so I want to hold off on the time investment here) Have the cells display a placeholder image from disk, while the picture is asynchronously loaded (this seems to be the best solution, but I'm currently not sure exactly how to do best do this) There's the fast drawing recommendation from Tweetie, but I don't know that will have much affect if it turns out my overhead is in network loading (http://blog.atebits.com/2008/12/fast-scrolling-in-tweetie-with-uitableview/) Thoughts/implementation advice? Thanks!

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• [[UIDevice currentDevice] orientation] always null

  - by Toby Wilson

  As per the title. Calling [[UIDevice currentDevice] BeginGeneratingDeviceOrientationNotifications] has no effect. DidRotateToInterfaceOrientation etc events are working fine, but I need to be able to poll the device orientation arbitrarily. How can I fix/do this? The long story: I have a tab application with a navigation controller on each tab. The root view of tab number one is a graph that goes full screen when the orientation changes to landscape; however this needs to be checked whenever the view appears as the orientation change could have occurred elsewhere, so I was hoping to poll the orientation state whenever this view appears.

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• How to set the image into fit screen in the image view

  - by Pugal Devan

  Hi, I am new to iphone development. I want to display the actual size of the image in image view. I have created image view by using Interface builder and set the properties. Now the problem is, I have set into "Scale to Fill", then the image will be stretched in the full screen. Now i want to display the actual size of the image will be displayed in image view. For example 52X52 size image should be displayed with the same size in the image view.The 1200X1020 size image should be fit to the size of the image view .So according the size of the image it should fit to image view and i want the image smaller than image view should retain its original size(It should not stretch to fit the image view). Is it any possible solution to achieve it, please guide me. Thanks.

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• iPad leak - NSPushAutoreleasePool

  - by Tim Bowen

  We are getting a sizable leak (16kb) that is proving very difficult to eliminate. The responsible library is Foundation and the Responsible frame is NSPushAutoreleasePool. This leak does not appear on the iPhone, only the iPad. We get the following stack trace: 9 libSystem.B.dylib thread_assign_default 8 libSystem.B.dylib _pthread_start 7 WebCore RunWebThread(void*) 6 CoreFoundation CFRunLoopRunInMode 5 CoreFoundation CFRunLoopRunSpecific 4 CoreFoundation __CFRunLoopDoObservers 3 WebCore WebRunLoopLock(__CFRunLoopObserver*, unsigned long, void*) 2 Foundation NSPushAutoreleasePool 1 Foundation _NSAPAddPage 0 libSystem.B.dylib malloc We're getting a similar one in the frame NSAutoReleasePool. We've checked everywhere in the code we create an autoreleasepool to make sure we're releasing it. Since none of this is our code I'm not sure how to proceed. Thanks in advance.

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• error with "pmem.c" compiling linux source code for android

  - by Preetam

  I am compiling linux source code for android emulator. When i execute make command(for building and cross-compiling the linux source) i get the following error "pmem.c" file. root@ubuntu:~/common# make CHK include/linux/version.h CHK include/linux/utsrelease.h SYMLINK include/asm - include/asm-x86 CALL scripts/checksyscalls.sh CHK include/linux/compile.h CC drivers/misc/pmem.o drivers/misc/pmem.c:441: error: conflicting types for ‘phys_mem_access_prot’ /home/preetam/common/arch/x86/include/asm/pgtable.h:383: note: previous declaration of ‘phys_mem_access_prot’ was here drivers/misc/pmem.c: In function ‘flush_pmem_file’: drivers/misc/pmem.c:805: error: implicit declaration of function ‘dmac_flush_range’ drivers/misc/pmem.c: In function ‘pmem_setup’: drivers/misc/pmem.c:1265: error: implicit declaration of function ‘ioremap_cached’ drivers/misc/pmem.c:1266: warning: assignment makes pointer from integer without a cast make[2]: * [drivers/misc/pmem.o] Error 1 make[1]: [drivers/misc] Error 2 make: ** [drivers] Error 2 root@ubuntu:~/common# how to resolve this error. It seems that there may some problems in the "pmem.c" file and i'll have to choose different git repository. but that would be a very complex thing, as now i have already done most of the things till here. I might have to see correct version of this file. please someone tell what should i do? how to solve this errors. please help..thankyou!

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• Why is AudioOutputUnitStart freezing my app in iOS 4?

  - by Luke

  Hi guys, I have an audio app which uses the RemoteIO AudioUnit. It works fine on iPhone, iPad, and any flavor of the simulator on 3.2, but when it hits AudioOutputUnitStart (), it freezes. I get the message "AddRunningClient starting device on non-zero client count" in the console, which I'm not sure how to resolve. I stop the unit and dispose of the AudioComponent every time the app closes. The app works fine the first time I run after restarting everything, but freezes every time after that. What's strange is there are no error messages - just an unresponsive interface and a frozen line of code. Thanks for your help. Luke

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• Problem when loading image from google chart api URL

  - by user304839

  I want to show concentric charts of google api in iphone, but the imageData varible returns null value and image does not loaded from url to image view this is code: NSData *imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://chart.apis.google.com/chart?cht=pc&chd=t:120,45|120,60,50,70,60&chs=300x200&chl=||helo|wrd|india|pak|ban&chco=FFFFFF|FFFFFF,e72a28|a9d331|ffce08|8a2585|184a7d"]]; NSLog(@"%@",imageData); UIImage *myimage = [[UIImage alloc] initWithData:imageData]; self.myImageView.image=myimage; please any one help me to overcome on this problem

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• New line and returns ignored in setMessageBody

  - by Magic Bullet Dave

  Am I doing something dumb? I can pre-fill and email ok but the "\r\n" is ignored in the emailBody: - (void) sendEventInEmail { MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; NSString *emailSubject = [eventDictionary objectForKey:EVENT_NAME_KEY]; [picker setSubject:emailSubject]; // Fill out the email body text NSString *iTunesLink = @"http://itunes.apple.com/gb/app/whats-on-reading/id347859140?mt=8"; // Link to iTune App link NSString *content = [eventDictionary objectForKey:@"Description"]; NSString *emailBody = [NSString stringWithFormat:@"%@\r\nSent using <a href = '%@'>What's On Reading</a> for the iPhone.", content, iTunesLink]; [picker setMessageBody:emailBody isHTML:YES]; picker.navigationBar.barStyle = UIBarStyleBlack; [self presentModalViewController:picker animated:YES]; [picker release]; } Regards Dave

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• Rotation of a single UIViewController in a UITabBarController

  - by burki

  Hi! I have a UITabBarController with four UINavigationControllers. Well, I want to enable the rotation just for one of the four UIViewControllers. According to Apple's doc you shouldn't subclass UITabBarController, so I don't wanna do that. All UIViewControllers should support the same orientations that it works, but that's not what I want. How can the single UIViewController, which should support the rotation, detect that the device has changed its orientation? Because unless all the UIViewControllers added to the UITabBarControllers support the same orientation, the methods of the UIViewController for managing the rotation aren't called. I've been searching now for a while, but I haven't already found a pleasant answer. I guess a lot of developers wonder how to manage that. I already thank you for your answer.

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• tabbar hides when calling a UIViewController

  - by user292049

  Hi.. I am barely new to IPhone Programming so can anyone please shed some light for my problem. Current SetUp: I have Tabbar Controller(4 TabbarItem's) When u click the secondtabbaritem - It calls second.xib which is of type UIViewController. My Requirement: I have a button inside the view. So when i click the button, it should load another UIViewController with the tabbar visible. Problem: I am able to do so, but the tabbar disappears, and i need to quit the application to start go back to the see the tabbar again. Pls help me Cheers Anand

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• NSDictionary: convert NSString keys to lowercase to search a string on them

  - by VansFannel

  Hello. I'm developing an iPhone application. I use a NSDictionary to store city's names as key, and population as value. I want to search the keys using lowercase. I've using this: NSDictionary *dict; [dict objectForKey:[[city stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] lowercaseString]]; But, it doesn't work. I know, I can do a for, convert keys to lowercase and compare with city. Is there any other way to do that? Maybe, with a NSDictionary method. UPDATE The NSDictionary is loaded from a property list. Thank you.

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• Why can't I retrieve UIDeviceOrientation correctly while playing a movie in MPMoviePlayerController?

  - by Zelldweller

  Everything works fine while I'm not playing anything (I'm calling beginnotifications, etc, and using the orientation to rotate my view). But after I start playing with MPMoviePlayerController every time I try a... UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; ...orientation gets a UIDeviceOrientationUnknown. Any clue? When the movie stops everything works alright again. I need this orientation to rotate the player's window, because Im using Iphone OS 3.1 so I can't directly use the view property inside MPMovie player controller.

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• Finding App Id under .ipa or .app

  - by Rafael Oliveira

  I'm building an application that search and recognizes any iPhone apps that user has in his/her computer. I would like to know a way to "extract" the id of the application from the .ipa file. I was trying to do the recognition using only the App File Name, but I discovered that the File Name is not the name of the app in Apple Store. Live Poker 6K Free by Zynga != Live Poker 3.7.ipa The id i'm talking about is the app id, like in, http://itunes.apple.com/app/live-poker-6k-free-by-zynga/id354901953?mt=8 the id is 354901953. Does any body has a clue how can I manage to find this information?

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• super dealloc error using multiple table view calsses

  - by padatronic

  I am new to Iphone apps and I am trying to build a tab based app. I am attempting to have a table ontop of an image in both tabs. On tab with a table of audio links and the other tab with a table of video links. This has all gone swimmingly, I have created two viewControllers for the two tables. All the code works great apart from to get it to work I have to comment out the super dealloc in the - (void)dealloc {} in the videoTableViewController for the second tab. If I don't I get the error message: FREED(id): message numberOfSectionsInTableView: sent to freed object please help, i have no idea why it is doing this...

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• How to implement UIViewController rotation in response to orientation changes?

  - by Greg Maletic

  My app has about 10 different UIViewControllers, just one of which I want to switch to landscape mode if the device is rotated. (All the rest, I want to keep in portrait.) In order to implement rotation on that one view, I needed to implement its controller's 'shouldAutorotate' method and return YES. Since this view is accessed via a navigation controller, I also needed to create a subclass of UINavigationController that implements 'shouldAutorotate' and return YES. This solution works, but too well. I find that all of the UIViewControllers I push onto my subclass of UINavigationController respond to rotation, even if I implement 'shouldAutorotate' and return NO. (Remember: I only want one particular UIViewController to respond to rotation, not every one in the navigation controller's stack.) So, my question is: how do I best do this? All the solutions I can come up with seem 1) cumbersome, and 2) worse, don't seem to work. Thanks very much.

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• Subview position issue after UIOrientation (rotation) change

  - by asadqamber

  I have a viewController and have added a subview in it programatically. secondView.autoresizingMask = UIViewAutoresizingFlexibleWidth; [self.view addSubview:secondView]; I guess when the device rotates, my mainViewController knows that orientation changed, but the subview (secondView) inside the mainViewController does not know this, so I change its frame to landscape size in willRotateToInterfaceOrientation. secondView.frame = CGRectMake(0, 0, 480 , 260); This does not set in the correct position, it's 11 px below the NavigationBar. Why does it start from 11 px below the navigation bar? The navigation bar shrinks when we move from portrait to landscape mode and its because of this that my subview is 11px below.

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• UITableView details as a subview

  - by Leonardo

  Hi all, I have a UITableView in iPhone with enough cell to make it scrollable. I would like to have a subview display whenever I click on a cell, rather than using the navigation controller behaviour. The problem is that I cannot calculate the CGRect exactly to have the subview always centered in page, because the CGRect is calculated from top of table, and if I scroll table and click cell, the subview will be added out of screen. The solution could be easy, but I don't know if it's possible: identify the portion of the current viewable area of the UITableView and obtain in some way the frame and therefore origin and size, then build a subview based on such coordinates. Do you think it's possible without writing not too much code ? thanks Leonardo

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• Objective C block gives link error

  - by ennuikiller

  I'm trying to use objective-c blocks for some iPhone programming and am getting the following link time error: The relevant code is: - (NSDictionary *) getDistances { CLLocationCoordinate2D parkingSpace; NSMutableDictionary *dict; NSIndexSet *indexForUser; BOOL (^test)(id obj, NSUInteger idx, BOOL *stop); test = ^ (id obj, NSUInteger idx, BOOL *stop) { NSString *user = (NSString *)[(NSDictionary *)obj valueForKey:@"userid"]; if ([user isEqualToString:self->sharedUser.userName]) { return YES; } return NO; }; [self->sharedUser.availableParking indexesOfObjectsPassingTest:test]; } Any help would be very much appreciated!!

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• Apple documentation incorrect about MKMapView -regionThatFits: ?

  - by jtrim

  In the Apple documentation for the -regionThatFits: method of the MKMapView, it says that this will return a new region centered on the same point as the region that's passed in, only with the regions bounds corrected for the iPhone screen aspect ratio. This seems to be incorrect in implementation...before the call to this method, my region shows up as: $5 = { center = { latitude = 37.322898864746094, longitude = -122.03209686279297 }, span = { latitudeDelta = 14.278411865234375, longitudeDelta = 1.5202401876449585 } } ..however, after the call to this method, I end up with: $6 = { center = { latitude = 36.973427342552824, longitude = -122.03209686279297 }, span = { latitudeDelta = 14.521333317196799, longitudeDelta = 14.0625 } } This is quite a big difference on the map - this translates to the distance between Cupertino, CA and Santa Cruz, CA. Anyone else experience this discrepancy?

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• How does the linux kernel manage less than 1GB physical memory ?

  - by TheLoneJoker

  I'm learning the linux kernel internals and while reading "Understanding Linux Kernel", quite a few memory related questions struck me. One of them is, how the Linux kernel handles the memory mapping if the physical memory of say only 512 MB is installed on my system. As I read, kernel maps 0(or 16) MB-896MB physical RAM into 0xC0000000 linear address and can directly address it. So, in the above described case where I only have 512 MB: How can the kernel map 896 MB from only 512 MB ? What about user mode processes in this situation? Where are user mode processes in phys RAM? Every article explains only the situation, when you've installed 4 GB of memory and the kernel maps the 1 GB into kernel space and user processes uses the remaining amount of RAM. I would appreciate any help in improving my understanding. Thanks..!

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