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• Objective-C retain counts in dealloc

  - by Michael Waterfall

  I'm seeing something fairly strange here, I've got breakpoints set in various dealloc methods in my app, and on inspection, the retain counts of the object self varies from 1 to 0. When dealloc is called, will the retain count of the object be set to 0 already? I'm using print (int) [self retainCount] in the console to test this. The 0's seem to only appear in the dealloc of my NSOperation's that are being run in an NSOperationQueue. Any idea why this is?

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• Properly releasing UITableViewController and UITableView directly added to a UIViewController

  - by JK

  I have a UIViewController (parentVC) to which I add a UITableViewController as follows (it is not pushed since the tableview only occupies about half the screen): tableVC = [[SmallTableVC alloc] initWithStyle:UITableViewStylePlain]; [self.view addSubview:tableVC.tableView]; In dealloc, I add [tableVC release]; Using instruments, I can see that the tableVC is indeed fully released when parentVC released, which is good, but I am not sure why as I thought that the UITableView of tableVC would have a retain count of 2 (1 for retention by tableVC and 1 for retention by parentVC). My intuition was that an additional [tableVC.tableView release] would be required, but adding it crashes the app. Why is tableVC released properly by the current code (if indeed it actually is)? Does a UITableViewController not retain its tableView? Thanks.

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• How to get cell text based on indexPath?

  - by Sheehan Alam

  I have a UITabBarController with more than 5 UITabBarItems so the moreNavigationController is available. In my UITabBarController Delegate I do the following: - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { //do some stuff //... UITableView *moreView = (UITableView *)self.tabBarController.moreNavigationController.topViewController.view; moreView.delegate = self; } I want to implement a UITableViewDelegate so I can capture the row that was selected, set a custom view property and then push the view controller: - (void)tableView:(UITableView *)tblView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //how can I get the text of the cell here? } I need to get the text of a cell when the user taps on a row. How can I accomplish this?

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• Error "Create a concrete instance!"

  - by dododedodonl

  Hey All, I've got another problem in the same code... I'm getting this error: *** initialization method -initWithFormat:locale:arguments: cannot be sent to an abstract object of class NSString_RegEx: Create a concrete instance! But I don't understand the error or what I should do...

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• Create NSString from strings within a dictionary

  - by David Reynolds

  I have an NSDictionary where both the keys and values are NSStrings and I'd like to create one NSString from them in the form of Key1: Value1 Key2: Value2 What is the best method of doing this?

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• Saving CFPropertyLists To Users Folder

  - by stephen blinkhorn

  I'm trying to save a CFPropertyList to a location in the user's home folder. Using the code below I'm getting errorCode = -10 (unknown error). CFURLRef fileURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, CFSTR("~/testfile.txt"), kCFURLPOSIXPathStyle, false ); SInt32 errorCode; Boolean status = CFURLWriteDataAndPropertiesToResource(fileURL, xmlData, NULL, &errorCode); If I change the path to something like "/testfile.txt" without the '~' then everything works. How can one save a property list to the current user's home folder? Must one obtain the user's name first and include it in the path such as /users/toffler/testfile.txt?

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• When is 'drawRect' called?

  - by Egil

  I have some custom drawing code in drawRect which also performs some calculation of sizes. When is the earliest I can be sure that this code has been loaded, e.g. if I want to modify it's containers size accordingly?

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• Strange behaviour of NSScanner on simple whitespace removal

  - by Michael Waterfall

  I'm trying to replace all multiple whitespace in some text with a single space. This should be a very simple task, however for some reason it's returning a different result than expected. I've read the docs on the NSScanner and it seems like it's not working properly! NSScanner *scanner = [[NSScanner alloc] initWithString:@"This is a test of NSScanner !"]; NSMutableString *result = [[NSMutableString alloc] init]; NSString *temp; NSCharacterSet *whitespace = [NSCharacterSet whitespaceCharacterSet]; while (![scanner isAtEnd]) { // Scan upto and stop before any whitespace [scanner scanUpToCharactersFromSet:whitespace intoString:&temp]; // Add all non whotespace characters to string [result appendString:temp]; // Scan past all whitespace and replace with a single space if ([scanner scanCharactersFromSet:whitespace intoString:NULL]) { [result appendString:@" "]; } } But for some reason the result is @"ThisisatestofNSScanner!" instead of @"This is a test of NSScanner !". If you read through the comments and what each line should achieve it seems simple enough!? scanUpToCharactersFromSet should stop the scanner just as it encounters whitespace. scanCharactersFromSet should then progress the scanner past the whitespace up to the non-whitespace characters. And then the loop continues to the end. What am I missing or not understanding?

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• The app store version of my software is slow!!!

  - by RW

  I Just purchased my app from the app store. It is unbelievable slow! I then ran my same code via the USB cable and it was blazing fast. what is wrong? If I create an adhoc app will that allow me to see where things are going wrong?

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• UIScrollView - with paging enabled, can I "change" the page width?

  - by Mike McMaster

  What's the simplest way to have a scroll view (with pagingEnabled set to YES) have a page width set to something other than the scroll view's bounds? Let me give an example. Suppose I have a scroll view with 10 items, each 150 pixels wide, and my scroll view is 300 pixels wide. If I start with views 1 and 2 visible and scroll horizontally to the right, I want the next "page" to show items 2 and 3. If I scroll one more page to the right, I would see items 3 and 4. Has anyone done this? If not, what strategy would you use?

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• using KVO to update an NSTableView filtered by an NSPredicate

  - by KingRufus

  My UI is not updating when I expect it to. The application displays "projects" using a view similar to iTunes -- a source list on the left lets you filter a list (NSTableView) on the right. My filters update properly when they are examining any simple field (like name, a string), but not for arrays (like tags). I'm removing a tag from one of my objects (from an NSMutableArray field called "tags") and I expect it to disappear from the list because it no longer matches the predicate that is bound to my table's NSArrayController. ProjectBrowser.mm: self.filter = NSPredicate* srcPredicate = [NSPredicate predicateWithFormat:@"%@ IN %K", selectedTag, @"tags"]; Project.mm: [self willChangeValueForKey:@"tags"]; [tags removeAllObjects]; [self didChangeValueForKey:@"tags"]; I've also tried this, but the result is the same: [[self mutableArrayValueForKey:@"tags"] removeAllObjects]; Interface Builder setup: a ProjectBrowser object is the XIB's File Owner an NSArrayController (Project Controller) has its Content Array bound to "File's Owner".projects Project Controller's filter predicate is bound to "File's Owner".filter NSTableView's column is bound to "Project Controller".name

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• Sub-viewController doesn't get autorotation notifications, bug?

  - by Shizam

  If I have a view (and its controller) and I override the willAnimateRotationToInterfaceOrientation method so I can respond to autorotation events everything works fine and dandy. Now if I create another viewController and add its view to the first viewController's view via: [firstViewController.view addSubview:secondViewController.view] The secondViewController's willAnimateRotationToInterfaceOrientation method isn't called. What gives? Thanks, Sam

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• NSDecimalNumber multiplication strangeness

  - by rein

  ExclusivePrice, quantity are both NSDecimalNumbers. NSDecimalNumber *price = [exclusivePrice decimalNumberByMultiplyingBy:quantity]; NSLog(@"%@ * %@ = %@", exclusivePrice, quantity, price); The result I get: 2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = -0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007169919476068871316457914368 What I expected: 2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = 130 Can anyone explain this please?

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• How to hide a tabbar at the app startup?

  - by Georg

  So, I want my app starts with a UIViewController(without seeing a tabbar), and then enter a UITableView with navigationbar and tabbar. the problem is that the Tabbar is visible at the app starts up, anyone can help on this will be very appreciated...

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• iPhone: Create a single UIView from multiple clicks

  - by Cuzog

  I'm making a partial overlay modal in my app with the code from “Semi-Modal (Transparent) Dialogs on the iPhone” at ramin.firoozye.com. In doing so, the button that calls the modal is still visible and clickable. I will hide this button when the modal spawns, but I want to be sure if the user clicks very quickly twice, a new modal doesn't come up for each click. What is the best way to check that the modal doesn't already exist when calling it from the button click? You can download the test project here. For those that don't have xcode, the relevant functions are below: I call forth the modal on button click with this: - (IBAction)displayModal:(id)sender { ModalViewController *modalController = [[ModalViewController alloc] initWithNibName:@"ModalViewController" bundle:nil]; modalController.view.frame = CGRectOffset(modalController.view.frame, 0, 230); [self showModal:modalController.view]; } Then use this function to animate the custom modal over the current view: - (void)showModal:(UIView*) modalView { UIWindow* mainWindow = (((TestAppDelegate*) [UIApplication sharedApplication].delegate).window); CGPoint middleCenter = modalView.center; CGSize offSize = [UIScreen mainScreen].bounds.size; CGPoint offScreenCenter = CGPointMake(offSize.width / 2.0, offSize.height * 1.5); modalView.center = offScreenCenter; // we start off-screen [mainWindow addSubview:modalView]; // Show it with a transition effect [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.4]; // animation duration in seconds modalView.center = middleCenter; [UIView commitAnimations]; } Then I dismiss the modal on button click with this: - (IBAction)dismissModal:(id)sender { [self hideModal:self.view]; } And then use these functions to animate the modal offscreen and clean itself up: - (void)hideModal:(UIView*) modalView { CGSize offSize = [UIScreen mainScreen].bounds.size; CGPoint offScreenCenter = CGPointMake(offSize.width / 2.0, offSize.height * 1.5); [UIView beginAnimations:nil context:modalView]; [UIView setAnimationDuration:0.7]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(hideModalEnded:finished:context:)]; modalView.center = offScreenCenter; [UIView commitAnimations]; } - (void)hideModalEnded:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context { UIView* modalView = (UIView *)context; [modalView removeFromSuperview]; [self release]; } Any help is greatly appreciated!

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• does copyWithZone on an NSArray call copyWithZone on its elements too?

  - by malik

  Hi, here's the scenario, I have this array of Person objects. copyWithZone is implemented on Person and works as expected. I have an array of Person objects, however when I create a copy of the array and modify things in original array (change attributes of a Person) it chances the copy as well. So my best guess is that when I call copyWithZone on NSArray, it does not call it on its elements. Please confirm.

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• className method?

  - by fuzzygoat

  I have just been watching the Stanford iPhone lecture online from Jan 2010 and I noticed that the guy from Apple keeps referring to getting an objects class name using "className" e.g. NSArray *myArray = [NSArray arrayWithObjects:@"ONE", @"TWO", nil]; NSLog(@"I am an %@ and have %d items", [myArray className], [myArray count]); However, I can't get this to work, the closest I can come up with it to use class, is className wrong, did it get removed, just curious? NSArray *myArray = [NSArray arrayWithObjects:@"ONE", @"TWO", nil]; NSLog(@"I am an %@ and have %d items", [myArray class], [myArray count]); Gary

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• runModalForWindow throttles http requests

  - by Nikita Rybak

  I have url connection, which normally works fine NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:delegate]; But when I create a modal window, no request ever receives response: [NSApp runModalForWindow:window]; If I comment this line out, thus creating a 'standard' window, everything works. I tried implementing all methods from NSURLConnectionDelegate, not a single of them called. I suspect this is something about 'run loops', but have little experience in this area. Does anybody have experience in this? Thank you

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• How to use UIWebView to get scrolling text ?

  - by srikanth rongali

  Hi, In my iPhone application I need a scrolling text. I had the text to be displayed and scrolled up and down but I could not get customized text. I mean all the text is of same font. I need some different font size text . I am using UITextView, but UITextView do not support customized text in it. How can I have the scrolling text which has different font size. I read that to use UIWebView for this. But, I could not understand how to use it. the text contains no url's no editing.(It need to be just static text to read). How can I do this ? Thank you.

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• UIImage couldn't load some png picture.

  - by www.ruu.cc

  I Use the following code to load png image: UIImage *imageBack1 = [UIImage imageNamed:@"Bar1.png"]; UIImage *imageBack2 = [UIImage imageNamed:@"Bar2.png"]; imageBack1 work right when imageBack2's value is nil, Bar1.png and Bar2.png are located at the same place,but why Bar2.png couldn't be load?

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• How do I set up a proxy object in the main application NIB?

  - by zoul

  Hello! I would like to set up a proxy object in the application NIB file. The problem is that the NIB file is the main application NIB that gets loaded automatically by the application and therefore I cannot set up the UINibProxiedObjectsKey dictionary as described in the documentation. Is there a way to set up a proxy object in the main application NIB? Or can I tap into the code that loads the main application NIB?

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• How to use NSObject subclass?

  - by Jon

  So I've created a subclass of NSObject called Query @interface Query : NSObject @property (nonatomic, assign) NSNumber *weight; @property (nonatomic, assign) NSNumber *bodyFat; @property (nonatomic, assign) NSNumber *activityLevel; @end Is this correct for setting the object's property? In VC1: BodyFatViewController *aViewController = [[BodyFatViewController alloc]init]; aViewController.query = self.query; [self.navigationController pushViewController:aViewController animated:YES]; In VC2: - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { Query *anQuery = [[Query alloc]init]; anQuery.bodyFat = [self.bodyFatArray objectAtIndex:row]; anQuery.weight = self.query.weight; self.query = anQuery; }

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• Adding image together with text in a picker view

  - by iSharreth

  Can we add image together with text in a picker view? Anyone please help!

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• Will iPhone OS4 make your life easier or harder as a lone app developer?

  - by Matt

  I am interested to hear what people feel about the new iPhone OS4 release. It is obviously very exciting having access to all the new features, apparently (from apple.com) it has over 1500 new APIs. My original thoughts were "Wow, this is awesome", and I suppose it is. I was just getting comfortable with OS 3.2 development though, and now there is a raft of additional stuff to learn in order to keep up with the pack. So I am feeling quite frustrated! Do you think, when working as an individual app developer, having access to these additional features would improve your applications or just water down the quality? I guess being giving the opportunity to improve applications and provide better features should be welcomed. I think frustration comes from struggling to keep up with the continuous changes, but thats the industry we are in I suppose! Any thoughts/comments?

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• I need help to debug my XML parsing please

  - by Griffo

  I'm parsing this line: <type>branch</type> with this code if ([elementName isEqualToString:@"type"]) { [currentBranchDictionary setValue:currentText forKey:currentElementName]; } When I test the value in the type key, it does not contain branch but instead it contains branch\n. Here is the test I'm performing: if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch"]) { NSLog(@"no new-line"); } else if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch\n"]) { NSLog(@"new-line"); } this returns the "new-line" output I don't understand where the carriage return is being added, can anyone help?

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