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• Does it make sense to use a NSFetchedResultsController without an UITableViewController? How are the

  - by dontWatchMyProfile

  I mean... could I also just create a plain old UIViewController and then set up a UITableView myself, plus an NSFetchedResultsController? How much do UITableViewController and NSFetchedResultsController interact with eachother? As far as I see it, UITableViewController is NOT by default already adopting the NSFetchedResultsControllerDelegate protocol. It almost looks like if UITableViewController has been developed without knowing about NSFetchedResultsController. Probably they even did that before developing FRC. Anyways, just a raw guess because the UITableViewController lacks of mentioning FRC at all. So the only thing I see in UITableViewController is that it is already the delegate for a UITableView by adopting the protocol, and it sets up the UITableView instance for me and assigns it internally to it's tableView property. Is that the whole magic of UITableViewController? (note: the nsfetchedresultscontrolle tag is not a typo. SO has a limit for the num of chars...too bad for that missing r, that's why I avoided this tag in my other buch of questions like the plague)

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• Infinite loop when adding CATiledLayer to UIView

  - by Jean

  I have a UIView in which I add a CATiledLayer and implement 'drawLayer'. If I use a UIViewController and add the layer to a new subview of the controller, then everything is ok. If I however try to use a UIView to and do all the craetion and drawing within this, then I get a infinite loop at the point shown below when I add this view to a superview. 0x002cfafb <+0425> ja 0x2cfa23 <-[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:]+209> What am I missing?

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• How does UIImage work in low-memory situations?

  - by kubi

  According to the UIImage documentation: In low-memory situations, image data may be purged from a UIImage object to free up memory on the system. Does anyone know how this works? It appears that this process is completely transparent and will occur in the background with no input from me, but I can't find any definitive documentation one way or the other. Second, will this data-purge occur when the image is not loaded by me? (I'm getting the image from UIImagePicker). Here's the situation: I'm taking a picture with the UIImagePickerController and and immediately taking that image and sending it to a new UIViewController for display. Sending the raw image to the new controller crashes my app with memory warnings about 30% of the time. Resizing the image takes a few moments, time that I'd rather not spend if there's a 3rd option available to me.

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• How to HIDE the iPad keyboard from a MODAL view controller?

  - by Cal

  I'm trying to hide the iPad keyboard from a modal view controller but it doesn't work. I have tried resignFirstResponder but that doesn't have any affect if we are in a modal view controller. I tried resignFirstResponder in a non-modal UINavigationController with the very same UIViewController and the keyboard hides correctly. Does anyone know how solve this problem? Thanks. [Update] it looks like there's something wrong with my code because the resignFirstResponder does work (I made a simple test case instead of using my code). But I still don't know what the problem is.

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• Memory leak using NSMutableArray in RootViewController called from App Delegate

  - by Lauren Quantrell

  I've written code to restore the state of my app, but there's a memory leak in the NSMutableArray. I'm new to Xcode so I apologize if this is something trivial I have overlooked. Any help is appreciated. lq AppDelegate.m - (void)applicationDidFinishLaunching:(UIApplication *)application { [rootViewController restoreState]; } RootViewController.h @interface rootViewController : UIViewController { NSMutableArray *offendingNSMutableArray; } @property (nonatomic, retain) NSMutableArray *offendingNSMutableArray; RootViewController.m @synthesize offendingNSMutableArray; - (void)restoreState { // Gets an array stored in the user defaults plist NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; self.offendingNSMutableArray = [[NSMutableArray alloc] initWithArray:[userDefaults objectForKey:kArrayValue]]; } - (void)viewDidUnload { self.offendingNSMutableArray = nil; } - (void)dealloc { [offendingNSMutableArray release]; }

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• shouldAutorotateToInterfaceOrientation isn't getting called

  - by morgancodes

  What sort of conditions might prevent my UIViewController's shouldAutorotateToInterfaceOrientation method from being called? I've resorted to using NSNotificationCenter to listen for UIDeviceOrientationDidChangeNotification events, but would love to get the autoRotation behavior working properly. A couple shots in the dark about what's going wrong: Maybe I'm not creating my view controller correctly? Maybe it needs to be inserted in the responder chain and somthething I'm doing is preventing that from happening normally? This seems unlikely to me since my view controller is recieving touch events. Maybe the fact that the view contained by my controller relies on OpenGL has something to do with shouldAutorotateToInterfaceOrientation not getting called? Do either of these sound remotely possible as being responsible? Any other ideas of things to look at?

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• Objective-C Pointer to class that implements a protocol

  - by Winder

  I have three classes which implement the same protocol, and have the same parent class which doesn't implement the protocol. Normally I would have the protocol as pure virtual functions in the parent class but I couldn't find an Objective-C way to do that. How can I utilize polymorphism on these subclasses and call the functions implemented in the protocol without warnings? Some pseudocode if that didn't make sense: @interface superclass: NSObject {} @interface child1: superclass<MyProtocol> {} @interface child2: superclass<MyProtocol> {} The consumer of these classes: @class child1 @class child2 @class superclass @interface SomeViewController: UIViewController { child1 *oneView; child2 *otherView; superclass *currentView; } -(void) someMethod { [currentView protocolFunction]; } The only nice way I've found to do pure virtual functions in Objective-C is a hack by putting [self doesNotRecognizeSelector:_cmd]; in the parent class, but it isn't ideal.

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• Adding C++ Object to Objective-C Class

  - by Winder

  I'm trying to mix C++ and Objective-C, I've made it most of the way but would like to have a single interface class between the Objective-C and C++ code. Therefore I would like to have a persistent C++ object in the ViewController interface. This fails by forbidding the declaration of 'myCppFile' with no type: #import <UIKit/UIKit.h> #import "GLView.h" #import "myCppFile.h" @interface GLViewController : UIViewController <GLViewDelegate> { myCppFile cppobject; } @end However this works just fine in the .mm implementation file (It doesn't work because I want cppobject to persist between calls) #import "myCppFile.h" @implementation GLViewController - (void)drawView:(UIView *)theView { myCppFile cppobject; cppobject.draw(); }

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• iPhone - Setting background on UITableView

  - by Hans Espen

  Is there any way to set a background view on a UITableViewController? I try with the code I am using on a UIViewController, but the view comes over all the contents of the table view, and if I add the background view in the cellForRowAtIndexPath-method, it is not showing at all. Anyone done this before or have an idea on how it can be done? Here is the code I am using: UIImage *image = [UIImage imageNamed: @"background.jpg"]; UIImageView *backImage = [[UIImageView alloc] initWithImage: image]; [self.view addSubview: backImage]; [self.view sendSubviewToBack: backImage]; Thanks

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

  - by Mark

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

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• PushViewController after presentModalViewController like in Apples Alarm Clock app

  - by Fabian

  Hello together, my Question is quite simple. I have an add-button. When I tap on it -- presentmodelviewController presents a UIViewController, which contains a simple Table with cells. When I tap on a Cell, i want to display a new View using pushViewController, which automatically creates a "back Button". At the top of it in this new View i have a Textfield, where I can enter some Text. When I tap the back-button, the view slides back to the add-View (which was presented using modalView...). Now i want the text edited in the view before to be placed in the Label of the first row (cell) on which I tapped. So I want to do this for 5 cells. Each of them presenting another xib. Please, can anyone help? Thanks for your helpful replies.

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• How to overlay view over navigation controller bar?

  - by 0SX

  I've sorta got a little problem. I'm trying to add a popoverview to my app but part of the popoverview get's hidden by my navigation controller bar. How can I make my popoverview overlay over top of the navcontrollerbar? Here's an image of the problem: http://img593.imageshack.us/img593/4056/viewn.jpg Here's my code I'm working with: - (IBAction)onButtonClick:(UIButton *)button { if (self.popoverController) { [self.popoverController dismissPopoverAnimated:YES]; self.popoverController = nil; [button setTitle:@"Show Popover" forState:UIControlStateNormal]; } else { UIViewController *contentViewController = [[WEPopoverContentViewController alloc] initWithStyle:UITableViewStylePlain]; self.popoverController = [[[WEPopoverController alloc] initWithContentViewController:contentViewController] autorelease]; [self.popoverController presentPopoverFromRect:button.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES]; [contentViewController release]; [button setTitle:@"Hide Popover" forState:UIControlStateNormal]; } } Is there anyway to make this popover above the navigation controller bar? Here is the full source code what I'm working with https://github.com/werner77/WEPopover Hopefully someone knows how to fix this problem, Thanks in advance.

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• Interchanging presentModalViewController and pushViewController

  - by Neffster

  I am using a sample ViewController that is displayed in the sample program as a presentModalViewController. However, I want to use pushViewController on the UIViewController instead. The problem is that when I switch to pushViewController, the ViewController no displays properly. Functions in the ViewController are called, but I don't see anything. I change back to presentModalViewController and everything works. The question is what do I need to do to make pushViewController work? FCVC *fcVC; NSArray *array = [[NSBundle mainBundle] loadNibNamed:@"fcVC" owner:self options:nil]; fcVC = [array objectAtIndex:0]; A. [self presentModalViewController:fcVC animated:YES]; // "WORKS" or B. [self.navigationController pushViewController:fcVC animated:YES]; // "Doesn't work

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• UITextView Delegate shouldChangeTextInRange (or any over) doesn't get called

  - by justas wza

  Hello, I need to track changes in my UITextView method (actianly for limiting number of lines), but none of UITextViewDelegate methods are being called when editing in UITextView begins. Not even - (void)textViewDidChange:(UITextView *)textView; I dont know what Im doing wrong I added UITextViewDelegate method to header file like that: @interface PirmasViewController : UIViewController <UITextViewDelegate, MFMa...... And I put any methods for tracking changes in my implementation file: - (void)textViewDidChange:(UITextView *)textView{NSLog(@"something changed");} - (BOOL)textView:(UITextView *)aTextView shouldChangeTextInRange:(NSRange)aRange replacementText:(NSString*)aText{ NSLog(@"something changed"); return YES; }` but no rezults.

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• Scroll bar does not appear in UITableView

  - by user335398

  Hi there, When I create UITableView with UITableViewController, all the right - scroll bar is present on UITableView. But I'd like to place some more controls apart from table on the area, so I have to use UIViewController instead. I create UITableView *tableView as controller's member, and set controller as its delegate conforming to UITableViewDelegate and UITableViewDataSource protocols. All the OK now, except of scroll bars do not appear at all. tableView.showsVerticalScrollIndicator is set to YES. Where might be a problem? Much thanks! WBR, Timur

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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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• UITabBarController With UINavigationController "more" Tab Issue

  - by Medlay

  UITabBarController with UINavigationController "more" tab issue There is a problem with using UINavigationController in UITabBarController. I have a TabBar  with 6 items. Of course, a standart item "more" appears, and there are two UINavigationControllers that didn't fit in a TabBar. The core of the problem is: when I'm working with visible items (a first four), UIViewController can be pushed  in an UINavigationController: [self.navigationController pushViewController:userDataViewController animated:YES]; If you call on in "more" and rearrange items in such way, that a visible UINavigationController gets into "more", when calling on it userDataViewController appears.  This  userDataViewController is the last, which has got in a stack and a Back button leads back to "more", but not to the controllers, that were before a userDataViewController appeared. I understand that in fact a selector pushViewController is called from "more", and it pushes my UINavigationController in a stack, and it's not good. Maybe, someone has faced such problem and could help me to solve it? Thank you forward.

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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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• problem with IBoutlet UITableView connection

  - by ideafactory

  Hi,I'm having a problem with IBoutlet UITableView connection. It seems that the IBOutlet isn't connected to the TaleView. I set the delgate and the datasource to the files owner and set the iboutlet to the tableview in the nib. The tableview is well initialized. I just want to do some reloadData and it's not working. I try to do some deselectRow just to see if it isn't reloadData problem but it doesn't deselect so i assume that the iboutlet isn't associated with my tableview. This table view is in a viewcontroller that is called as a modalViewController. Here is some code: My .h file: @interface AddEditProjectsViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, UIActionSheetDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextViewDelegate, UIAlertViewDelegate>{ IBOutlet UITableView *addEditProjectTable; } @property (nonatomic, retain) IBOutlet UITableView *addEditProjectTable; @end My .m file: - (void)viewWillAppear:(BOOL)animated { (...) [addEditProjectTable reloadData]; [super viewWillAppear:animated]; Thanks for any help! :)

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• XCode 3.2 - can't create Objective-C class

  - by Urizen

  My installation of XCode 3.2 has begun to exhibit some strange behaviour. When I try to add a basic Objective-C classs (inheriting from NSObject), in my iPhone project, I get the following popup: "Alert. Couldn't load the next page". The above-mentioned error happens at the point of trying to create the file (i.e. the creation process doesn't get to the stage where you are asked to input the file name). It might also be worth mentioning that where there previously used to be a description for the file (in the file creation window) it now states "No description available". I can create other files (e.g. UIViewController subclass etc.) but not the basic Objective-C class. I have updated the documentation and restarted the machine and xcode several times without success. I would be extremely grateful for any assistance as I am relatively new to the XCode environment.

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• iPhone landscape navigation back action shows vertical view transition?

  - by Code Shogun

  I have a regular UINavigationController and I push a series of UIViewController into the stack. The view transition for push controller is horizontal animation transition: [self.navigationController pushViewController:controller animated:YES]; However, when I press the Back button on the navigation bar, the view transition animation is vertical (vertically dropping down the previous controller/view). I don't seem to find any way to make this horizontal. This happens only in Landscape mode. Portrait mode the transition all happens as horizontal flip transition. Can anyone shed any light on this? Thanks

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• Error: CLLocationManager headingAvailable

  - by Bubu4711

  I have the following code: In my .h-Header-File: #import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h> @interface Compass : UIViewController <CLLocationManagerDelegate> { [...] CLLocationManager *locationManager; } [...] @property(nonatomic, retain) CLLocationManager *locationManager; @end And my .m-File: #import "[FILENAME].h" [...] @synthesize locationManager; - (void)viewDidLoad { [super viewDidLoad]; self.locationManager = [[[CLLocationManager alloc] init] autorelease]; if(locationManager.headingAvailable == NO) { [...] } [...] } And I get the following error Message for "locationManager.headingAvailable": error:request for member 'headingAvailable' in something not a structure or union I've added the CoreLocation framework to my app... Who can help me?

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• Getting keyboard size from user info in Swift

  - by user3746428

  I have been trying to add some code to move my view up when the keyboard appears, however I am having issues trying to translate the Objective C examples into Swift. I have made some progress but I am stuck on one particular line. These are the two tutorials/questions I have been following: How to move content of UIViewController upwards as Keypad appears using Swift http://www.ioscreator.com/tutorials/move-view-when-keyboard-appears Here is the code I currently have: override func viewWillAppear(animated: Bool) { NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil) NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil) } override func viewWillDisappear(animated: Bool) { NSNotificationCenter.defaultCenter().removeObserver(self) } func keyboardWillShow(notification: NSNotification) { var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey)) UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0) let frame = self.budgetEntryView.frame frame.origin.y = frame.origin.y - keyboardSize self.budgetEntryView.frame = frame } func keyboardWillHide(notification: NSNotification) { // } At the moment I am getting an error on this line: var keyboardSize = notification.userInfo(valueForKey(UIKeyboardFrameBeginUserInfoKey)) If someone could let me know what this line of code should be, I should manage to figure out the rest myself.

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• Application crash when using an NSTimer and pushViewController

  - by Cesar

  I'm using an NSTimer to implement a 3 seconds splash screen. If a don't use a timer the view it's correctly pushed but if I use the timer for adding a little delay the application crash with a EXC_BAD_ACCESS. I'm pretty sure the answer contains "memory management" but I can't get the point... @interface RootViewController : UIViewController { NSTimer *timer; } -(void)changeView:(NSTimer*)theTimer; @property(nonatomic,retain) NSTimer *timer; ... @implementation RootViewController @synthesize timer; - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; [[self navigationController] setNavigationBarHidden:YES]; timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(changeView:) userInfo:nil repeats:NO]; } -(void)changeView:(NSTimer*)theTimer { NSLog(@"timer fired"); //Crash here, but only if called using a timer [[self navigationController] pushViewController:list animated:YES]; }

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• How do I integrate popToRootViewControllerAnimated with my tabs?

  - by Adam Storr

  Hello! I am trying to make one of my tab buttons go to the root using popToRootViewControllerAnimated. My question is: where do I put this code for it to work? I have my tabs created through Interface Builder... do they have to be hard coded for this to work? Here is the code that I'm looking to use: [self.navigationController popToRootViewControllerAnimated:YES]; New code in AppDelegate: - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController { if (viewController = HomeViewController) { [HomeViewController popToRootViewControllerAnimated:NO]; } }

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