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• Compare NSArray with NSMutableArray adding delta objects to NSMutableArray

  - by Hooligancat

  I have an NSMutableArray that is populated with objects of strings. For simplicity sake we'll say that the objects are a person and each person object contains information about that person. Thus I would have an NSMutableArray that is populated with person objects: person.firstName person.lastName person.age person.height And so on. The initial source of data comes from a web server and is populated when my application loads and completes it's initialization with the server. Periodically my application polls the server for the latest list of names. Currently I am creating an NSArray of the result set, emptying the NSMutableArray and then re-populating the NSMutableArray with NSArray results before destroying the NSArray object. This seems inefficient to me on a few levels and also presents me with a problem losing table row references which I can work around, but might be creating more work for myself in doing so. The inefficiency seems to be that I should be able to compare the two arrays and end up with a filtered NSArray. I could then add the filtered set to the NSMutableArray. This would mean that I can simply append new data to the NSMutableArray instead of throwing everything out and re-populating. Conversely I would need to do the same filter in reverse to see if there are records that need removing from the NSMutableArray. Is there any method to do this in a more efficient manner? Have I overlooked something in the docs some place that refers to a simpler technique? I have a problem when I empty the NSMutableArray and re-populate in that any referencing tables lose their selected row state. I can track it and re-select it, but my theory is that using some form of compare and adding objects and removing objects instead of dealing with the whole array in one block might mean I keep my row reference (assuming the item isn't deleted of course). Any suggestions or help much appreciated. Update Would it be just as fast to do a fast enumeration over each comparing each line item as I go? It seems like an expensive operation, but with the last fast enumeration code it might be pretty efficient...

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• Setting an NSMutableArray in AppDelegate to be an NSMutableArray in

  - by aahrens

  What i'm trying to accomplish is to have an NSMutableArray defined in the AppDelegate. I then have two UIViewControllers. One view is responsible for displaying the array from the AppDelegate. The other view is used to add items to the array. So the array starts out to be empty. View1 doesn't display anything because the array is empty. The User goes to View2 and adds an item to the array in AppDelegate. Then when the user goes back to View1 it now displays one item. Here is how I'm trying to accomplish this @interface CalcAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; UITabBarController *tabBarController; NSMutableArray *globalClasses; } @property (nonatomic,retain) NSMutableArray *globalClasses; My other view In the viewDidload I set the array in my View to be the one in the AppDelegate. In an effort to retain values. allCourses = [[NSMutableArray alloc]init]; CalcAppDelegate *appDelegate = (CalcAppDelegate *)[[UIApplication sharedApplication] delegate]; allCourses = appDelegate.globalClasses; Then I would update my allCourses array by adding a new item. Then try to set the array in the AppDelegate to be equal to the modified one. CalcAppDelegate *appDel = (CalcAppDelegate *)[[UIApplication sharedApplication] delegate]; NSLog(@"Size before reset %d",[appDel.globalClasses count]); appDel.globalClasses = allCourses; NSLog(@"Size after reset %d",[appDel.globalClasses count]); What I'm seeing that's returned is 2 in the before, and 2 after. So it doesn't appear to be getting updated properly. Any suggestions?

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• Problem with NSMutableArray

  - by zp26

  Hi, I have a problem with NSMutableArray. In my program i have a lot of variabile "CFSocketRef". i want to save this in NSMutableArray but i can't. Can you help me? Thank and sorry for my english XP My code: CFSocketRef socketAccept; NSMutableArray *arrayIP = [[NSMutableArray alloc] init]; self.socketAccept = CFSocketCreateWithNative(NULL, fd, kCFSocketDataCallBack, AcceptDataCallback, &context); [arrayIP addObject:(id)self.socketAccept];

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• Objective-C NSMutableArray Count Causes EXC_BAD_ACCESS

  - by JoshEH

  I've been stuck on this for days and each time I come back to it I keep making my code more and more confusing to myself, lol. Here's what I'm trying to do. I have table list of charges, I tap on one and brings up a model view with charge details. Now when the model is presented a object is created to fetch a XML list of users and parses it and returns a NSMutableArray via a custom delegate. I then have a button that presents a picker popover, when the popover view is called the user array is used in an initWithArray call to the popover view. I know the data in the array is right, but when [pickerUsers count] is called I get an EXC_BAD_ACCESS. I assume it's a memory/ownership issue but nothing seems to help. Any help would be appreciated. Relevant code snippets: Charge Popover (Charge details model view): @interface ChargePopoverViewController ..... NSMutableArray *pickerUserList; @property (nonatomic, retain) NSMutableArray *pickerUserList; @implementation ChargePopoverViewController @synthesize whoOwesPickerButton, pickerUserList; - (void)viewDidLoad { JEHWebAPIPickerUsers *fetcher = [[JEHWebAPIPickerUsers alloc] init]; fetcher.delegate = self; [fetcher fetchUsers]; } -(void) JEHWebAPIFetchedUsers:(NSMutableArray *)theData { [pickerUserList release]; pickerUserList = theData; } - (void) pickWhoPaid: (id) sender { UserPickerViewController* content = [[UserPickerViewController alloc] initWithArray:pickerUserList]; UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:content]; [popover presentPopoverFromRect:whoPaidPickerButton.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; content.delegate = self; } User Picker View Controller @interface UserPickerViewController ..... NSMutableArray *pickerUsers; @property(nonatomic, retain) NSMutableArray *pickerUsers; @implementation UserPickerViewController @synthesize pickerUsers; -(UserPickerViewController*) initWithArray:(NSMutableArray *)theUsers { self = [super init]; if ( self ) { self.pickerUsers = theUsers; } return self; } - (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component { // Dies Here EXC_BAD_ACCESS, but NSLog(@"The content of array is%@",pickerUsers); shows correct array data return [pickerUsers count]; } I can provide additional code if it might help. Thanks in advance.

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• Issues declaring already existing NSMutableArray in new class

  - by Graeme

  I have a class (DataImporter) which has the code to download an RSS feed. I also have a view and separate class (TableView) which displays the data in a UITableView and starts the parsing process, storing parsed information in an NSMutableArray (items) which is located in the (TableView) subclass. Now I wish to add a UIMapView which displays the items in the (items) NSMutableArray. Herein lies the issue - I need to somehow get the data from the (items) NSMutableArray into the new (mapView) subclass which I'm struggling with - and I preferably don't want to have to create a new class to download the data again for the mapView class when it already is in the applications memory. Is there a way I can transfer the information from the NSMutableArray (items) class to the (mapView) class (i.e. how do I declare the NSMutableArray in the (mapView) class)? Here's a overview of how the system works: App opened Data downloaded (using DataImporter class) when (TableView) viewDidLoad runs Data stored in NSMutableArray accessible by the (TableView) class And from here I need to access and declare the array from a new (mapView) class. Any help greatly appreciated, thanks. Code for viewDidLoad MapKit: Data *data = nil; NSString *ilocation = [data locations]; NSString *ilocation2 = @"New Zealand"; NSString *inewlString; inewlString = [ilocation stringByAppendingString:ilocation2]; NSLog(@"inewlString=%@",inewlString); if(forwardGeocoder == nil) { forwardGeocoder = [[BSForwardGeocoder alloc] initWithDelegate:self]; } // Forward geocode! [forwardGeocoder findLocation: inewlString]; Code for parsing data into original NSMutable Array: - (void)beginParsing { NSLog(@"Parsing has begun"); //self.navigationItem.rightBarButtonItem.enabled = NO; // Allocate the array for song storage, or empty the results of previous parses if (incidents == nil) { NSLog(@"Grabbing array"); self.datas = [NSMutableArray array]; } else { [datas removeAllObjects]; [self.tableView reloadData]; } // Create the parser, set its delegate, and start it. self.parser = [[DataImporter alloc] init]; parser.delegate = self; [parser start]; }

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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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• Pass NSMutableArray between two UIViewController's

  - by aahrens

  I have two view controllers name RootViewController and SecondViewController. In the FirstViewController I have this NSMutableArray @interface RootViewController : UITableViewController { NSMutableArray *allClasses;}@property (nonatomic,retain) NSMutableArray *allClasses; In the RootViewController I populate the UITableView with all the objects within allClasses In my SecondViewController I have @interface SecondViewController : UIViewController <UITextFieldDelegate,UIPickerViewDelegate> { NSMutableArray *arrayStrings;} I have a method that adds new NSStrings to the arrayStrings. My goal is to be able to pass the arrayStrings to the RootViewController by trying something similar to allClasses = arrayStrings. That way when the RootViewController is loaded it can populate with new information. How would I got about accomplishing that task?

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• iphone NSMutableArray loses objects at end of method

  - by Brodie4598

  Hello - in my app, an NSMutableArray is populated with an object in viewDidLoad (eventually there will be many objects but I'm just doing one til I get it working right). I also start a timer that starts a method that needs to access the NSMutableArray every few seconds. The NSMutableArray works fine in viewDidLoad, but as soon as that method is finished, it loses the object. myApp.h @interface MyApp : UIViewController { NSMutableArray *myMutableArray; NSTimer *timer; } @property (nonatomic, retain) NSMutableArray *myMutableArray; @property (nonatomic, retain) NSTimer *timer; @end myApp.m #import "MyApp.h" @implementation MyApp @synthesize myMutableArray; - (void) viewDidLoad { cycleTimer = [NSTimer scheduledTimerWithTimeInterval:4.0 target:self selector:@selector(newCycle) userInfo: nil repeats:YES]; MyObject *myCustomUIViewObject = [[MyObject alloc]init]; [myMutableArray addObject:myCustomUIViewObject]; [myCustomUIViewObject release]; NSLog(@"%i",[myMutableArray count]); /////outputs "1" } -(void) newCycle { NSLog(@"%i",[myMutableArray count]); /////outputs "0" ?? why is this?? }

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• Adding nil to NSMutableArray

  - by ayanonagon

  I am trying to create a NSMutableArray by reading in a .txt file and am having trouble setting the last element of the array to nil. NSString *filePath = [[NSBundle mainBundle] pathForResource:@"namelist" ofType:@"txt"]; NSString *data = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil]; NSArray *list = [data componentsSeparatedByString:@"\n"]; NSMutableArray *mutableList = [[NSMutableArray alloc] initWithArray:list]; I wanted to use NSMutableArray's function addObject, but that will not allow me to add nil. I also tried: [mutableList addObject:[NSNull null]]; but that does not seem to work either. Is there a way around this problem?

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• Total Size of NSMutableArray object

  - by sj wengi

  Hi Folks, I've got an NSMutableArray that holds a bunch of objects, what I'm trying to figure out is how much memory is the array using. After looking at a couple of places I know about the sizeof call, and when I make it I get 32 bits (which is the size of the NSMutableArray object it self). Example code: NSMutableArray *temp = [[NSMutableArray alloc]init]; [temp addObject:objectxyz]; [temp addObject:objectabc]; [temp addObject:object123]; now I want to know the size :) Thanks, Sj

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• NSMutableArray to NSString and Passing NSString to Another View IOS5.1

  - by Space Dust

  I have an NSMutableArray of names. I want the pass the data (selected name) inside of NSMutableArray as text to another view's label. FriendsController.m: - (void)viewDidLoad { [super viewDidLoad]; arrayOfNames=[[NSMutableArray alloc] init]; arrayOfIDs=[[NSMutableArray alloc] init]; userName=[[NSString alloc] init]; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { long long fbid = [[arrayOfIDs objectAtIndex:indexPath.row]longLongValue]; NSString *user=[NSString stringWithFormat:@"%llu/picture",fbid]; [facebook requestWithGraphPath:user andDelegate:self]; userName=[NSString stringWithFormat:@"%@",[arrayOfNames objectAtIndex:indexPath.row]]; FriendDetail *profileDetailName = [[FriendDetail alloc] initWithNibName: @"FriendDetail" bundle: nil]; profileDetailName.nameString=userName; [profileDetailName release]; } - (void)request:(FBRequest *)request didLoad:(id)result { if ([result isKindOfClass:[NSData class]]) { transferImage = [[UIImage alloc] initWithData: result]; FriendDetail *profileDetailPicture = [[FriendDetail alloc] initWithNibName: @"FriendDetail" bundle: nil]; [profileDetailPicture view]; profileDetailPicture.profileImage.image= transferImage; profileDetailPicture.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; [self presentModalViewController:profileDetailPicture animated:YES]; [profileDetailPicture release]; } } In FriendDetail.h NSString nameString; IBOutlet UILabel *profileName; @property (nonatomic, retain) UILabel *profileName; @property (nonatomic, retain) NSString *nameString; In FriendDetail.m - (void)viewDidLoad { [super viewDidLoad]; profileName.text=nameString; } nameString in second controller(FriendDetail) returns nil. When i set a breakpoint in firstcontroller I see the string inside of nameString is correct but after that it returns to nil somehow.

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• Problems pulling data from NSMutableArray for MapKit?

  - by Graeme

  Hi, I have a class (DataImporter) which has the code to download an RSS feed. I also have a view and separate class (TableView) which displays the data in a UITableView and starts the parsing process, storing parsed information in an NSMutableArray (items). Now I wish to add a UIMapView which displays the items in the items NSMutableArray. I'm struggling to transfer the data into the new class (mapView) to show it in the map - and I preferably don't want to have to create a new class to download the data again for the map. Is there a way I can transfer the information from the NSMutableArray (items) to the mapView? Thanks. Code for viewDidLoad MapKit: Data *data = nil; NSString *ilocation = [data locations]; NSString *ilocation2 = @"New Zealand"; NSString *inewlString; inewlString = [ilocation stringByAppendingString:ilocation2]; NSLog(@"inewlString=%@",inewlString); if(forwardGeocoder == nil) { forwardGeocoder = [[BSForwardGeocoder alloc] initWithDelegate:self]; } // Forward geocode! [forwardGeocoder findLocation: inewlString]; Code for parsing data into NSMutable Array: - (void)beginParsing { NSLog(@"Parsing has begun"); //self.navigationItem.rightBarButtonItem.enabled = NO; // Allocate the array for song storage, or empty the results of previous parses if (incidents == nil) { NSLog(@"Grabbing array"); self.datas = [NSMutableArray array]; } else { [datas removeAllObjects]; [self.tableView reloadData]; } // Create the parser, set its delegate, and start it. self.parser = [[DataImporter alloc] init]; parser.delegate = self; [parser start]; }

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• Can't add to NSMutableArray from SecondaryView

  - by Antonio

  Hi guys, I've searched and read and still haven't found a concrete answer. Brief: I have an application where I declare an NSMutableArray in my AppDelegate to synthesize when the application loads. (code below). I have a SecondaryViewController call this function, and I have it output a string to let me know what the array size is. Every time I run it, it executes but it does not add any objects to the array. How do I fix this? AppDelegate.h file #import <UIKit/UIKit.h> @class arrayTestViewController; @interface arrayTestAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; arrayTestViewController *viewController; NSMutableArray *myArray3; } @property (nonatomic, retain) NSMutableArray *myArray3; @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet arrayTestViewController *viewController; -(void)addToArray3; @end AppDelegate.m file #import "arrayTestAppDelegate.h" #import "arrayTestViewController.h" @implementation arrayTestAppDelegate @synthesize window; @synthesize viewController; @synthesize myArray3; #pragma mark - #pragma mark Application lifecycle - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { myArray3 = [[NSMutableArray alloc] init]; // Override point for customization after application launch. // Add the view controller's view to the window and display. [window addSubview:viewController.view]; [window makeKeyAndVisible]; return YES; } -(void)addToArray3{ NSLog(@"Array Count: %d", [myArray3 count]); [myArray3 addObject:@"Test"]; NSLog(@"Array triggered from SecondViewController"); NSLog(@"Array Count: %d", [myArray3 count]); } SecondViewController.m file #import "SecondViewController.h" #import "arrayTestAppDelegate.h" @implementation SecondViewController -(IBAction)addToArray{ arrayTestAppDelegate *object = [[arrayTestAppDelegate alloc] init]; [object addToArray3]; }

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• NSMutableArray count method show the NSMutableArray is count 0?

  - by Tattat

  This is my init method: -(id)init{ self = [super init]; magicNumber = 8; myMagicArray = [[NSMutableArray alloc] initWithCapacity:(magicNumber*magicNumber)]; NSLog(@"this is the magic Array: %d", [myMagicArray count]); return self; } This is the .h: @interface Magic : NSObject { NSMutableArray *myMagicArray; int magicNumber; } The console shows me that number is 0. instead of 64, wt's happen? I already check out this post: StackOverflow Link: http://stackoverflow.com/questions/633699/nsmutablearray-count-always-returns-zero

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• NSMutableArray withObject(UIImageView *)

  - by pureman

  I am trying to load an NSMutableArray with UIImageViews. Everything is going fine with that. Unfortunately, I have no idea how to use the objects when they are in the mutable array. Here is some code: UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; NSMutableArray *array = [NSMutableArray new]; [array loadWithObject:(UIImageView *)imageView]; [imageView release]; That kind of sets up what I've done. Here's what I want to do: [array objectAtIndex:5].center = GCRectMake(0, 0); but that doesn't work. How can I do this??

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• iPhone Setting ViewController nested in NSMutableArray

  - by Peter George

  Hello I'm trying to set attributes for a viewcontroller nested inside a NSMutableArray, for example I have 3 ViewController inside this array: FirstViewController *firstViewController = [FirstViewController alloc]; SecondViewController *secondViewController = [SecondViewController alloc]; ThirdViewController *thirdViewController = [ThirdViewController alloc]; NSMutableArray *viewControllerClasses = [[NSMutableArray alloc] initWithObjects: firstViewController, secondViewController, thirdViewController, nil]; for (int x=0; x<[viewControllerClasses count]; x++) { // as an example to set managedObjectContext I otherwise would set firstViewController.managedObjectContext = context; [viewControllerClasses objectAtIndex:x].managedObjectContext = context; } But this results in an error: Request for member "managedObjectContext" in something not a structure or union. Shouldn't be "firstViewController" be the same as [viewControllerClasses objectAtIndex:0]?

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• Add C pointer to NSMutableArray

  - by Georges Oates Larsen

  I am writing an Objective-C program that deals with low level image memory. I am using ANSI-C structs for my data storage -- Full blown objects seem overkill seeing as the data I am storing is 100% data, with no methods to operate on that data. Specifically, I am writing a customizable posterization algorithm which relies on an array of colors -- This is where things get tricky. I am storing my colors as structs of three floats, and an integer flag (related to the posterization algorithm specifically). Everyhting is going well, except for one thing... [actual question] I can't figure out how to add pointers to an NSMutableArray! I know how to add an object, but adding a pointer to a struct seems to be more difficult -- I do not want NSMutableArray dereferencing my pointer and treating the struct as some sort of strange object. I want NSMutableArray to add the pointer its self to its collection. How do I go about doing this? Thanks in advance, G

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• How to sort NSMutableArray of NSMutableDictionary?

  - by walkor

  I have NSMutableArray of NSMutableDictionary(NSString objects). One of NSString object is actually a date, and i need to sort NSMutableArray based on that date and I don't want it to sort dates as strings. How can i make it?

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• NSMutableArray & Multiple Views

  - by Antonio

  I am trying to write an application that has a NSMutableArray that needs to be accessed and modified in a different View. The MainViewController displays a table that gets the information from an NSMutableArray. The SecondaryViewController is used to addObjects into the array. How do I go about this without declaring it as a global variable?

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• NSMutableArray with only a particular type of objects

  - by Leo

  Hello, is it possible to specify that a NSMutableArray can only contain a certain type of objects. For example, if I want to store only this kind of objects : @interface MyObject : NSObject { UInt8 value; } In order to be able to use the instance variable like this : - (void)myMethod:(NSMutableArray *)myArray{ for (id myObject in myArray){ [self otherMethod:myObject.value]; } } because I'm getting this error : request for member 'value' in something not a structure or union Thank you for your help

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• Objective-C : Sorting NSMutableArray containing NSMutableArrays

  - by Dough

  Hi ! I'm currently using NSMutableArrays in my developments to store some data taken from an HTTP Servlet. Everything is fine since now I have to sort what is in my array. This is what I do : NSMutableArray *array = [[NSMutableArray arrayWithObjects:nil] retain]; [array addObject:[NSArray arrayWithObjects: "Label 1", 1, nil]]; [array addObject:[NSArray arrayWithObjects: "Label 2", 4, nil]]; [array addObject:[NSArray arrayWithObjects: "Label 3", 2, nil]]; [array addObject:[NSArray arrayWithObjects: "Label 4", 6, nil]]; [array addObject:[NSArray arrayWithObjects: "Label 5", 0, nil]]; First column contain a Label and 2nd one is a score I want the array to be sorted descending. Is the way I am storing my data a good one ? Is there a better way to do this than using NSMutableArrays in NSMutableArray ? I'm new to iPhone dev, I've seen some code about sorting but didn't feel good with that. Thanks in advance for your answers !

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• NSMutableArray of Objects

  - by Terry Owen

  First off I am very new to Objective C and iPhone programming. Now that that is out of the way. I have read through most of the Apple documentation on this and some third party manuals. I guess I just want to know if I'm going about this the correct way ... - (NSMutableArray *)makeModel { NSString *api = @"http://www.mycoolnewssite.com/api/v1"; NSArray *namesArray = [NSArray arrayWithObjects:@"News", @"Sports", @"Entertainment", @"Business", @"Features", nil]; NSArray *urlsArray = [NSArray arrayWithObjects: [NSString stringWithFormat:@"%@/news/news/25/stories.json", api], [NSString stringWithFormat:@"%@/news/sports/25/stories.json", api], [NSString stringWithFormat:@"%@/news/entertainment/25/stories.json", api], [NSString stringWithFormat:@"%@/news/business/25/stories.json", api], [NSString stringWithFormat:@"%@/news/features/25/stories.json", api], nil]; NSMutableArray *result = [NSMutableArray array]; for (int i = 0; i < [namesArray count]; i++) { NSMutableDictionary *objectDict = [NSMutableDictionary dictionary]; NSString *name = (NSString *)[namesArray objectAtIndex:i]; NSString *url = (NSString *)[urlsArray objectAtIndex:i]; [objectDict setObject:name forKey:@"NAME"]; [objectDict setObject:url forKey:@"URL"]; [objectDict setObject:@"NO" forKey:@"HASSTORIES"]; [result addObject:objectDict]; } return result; } Any insight would be appreciated ;-)

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• NSArray/NSMutableArray : Passed by ref or by value???

  - by wgpubs

  Totally confused here. I have a PARENT UIViewController that needs to pass an NSMutableArray to a CHILD UIViewController. I'm expecting it to be passed by reference so that changes made in the CHILD will be reflected in the PARENT and vice-versa. But that is not the case. Both have a property declared as .. @property (nonatomic, retain) NSMutableArray *photos; Example: In PARENT: self.photos = [[NSMutableArray alloc] init]; ChildViewController *c = [[ChildViewController alloc] init ...]; c.photos = self.photos; ... ... ... In CHILD: [self.photos addObject:obj1]; [self.photos addObject:obj2]; NSLog(@"Count:%d", [self.photos count]) // Equals 2 as expected ... Back in PARENT: NSLog(@"Count:%d", [self.photos count]) // Equals 0 ... NOT EXPECTED I thought they'd both be accessing the same memory. Is this not the case? If it isn't ... how do I keep the two NSMutableArrays in sync?

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• Need help with a possible memory management problem(leak) regarding NSMutableArray

  - by user309030

  Hi, I'm a beginner level programmer trying to make a game app for the iphone and I've encountered a possible issue with the memory management (exc_bad_access) of my program so far. I've searched and read dozens of articles regarding memory management (including apple's docs) but I still can't figure out what exactly is wrong with my codes. So I would really appreciate it if someone can help clear up the mess I made for myself. - (void)viewDidLoad { [super viewDidLoad]; self.gameState = gameStatePaused; fencePoleArray = [[NSMutableArray alloc] init]; fencePoleImageArray = [[NSMutableArray alloc] init]; fenceImageArray = [[NSMutableArray alloc] init]; mainField = CGRectMake(10, 35, 310, 340); .......... [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(gameLoop) userInfo:nil repeats:YES]; } So basically, the player touches the screen to set up the fences/poles -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if(.......) { ....... } else { UITouch *touch = [[event allTouches] anyObject]; currentTapLoc = [touch locationInView:touch.view]; NSLog(@"%i, %i", (int)currentTapLoc.x, (int)currentTapLoc.y); if(CGRectContainsPoint(mainField, currentTapLoc)) { if([self checkFence]) { onFencePole++; //this 3 set functions adds their respective objects into the 3 NSMutableArrays using addObject: [self setFencePole]; [self setFenceImage]; [self setFencePoleImage]; ....... } } else { ....... } } } } The setFence function (setFenceImage and setFencePoleImage is similar to this) -(void)setFencePole { Fence *fencePole; if (!elecFence) { fencePole = [[Fence alloc] initFence:onFencePole fenceType:1 fencePos:currentTapLoc]; } else { fencePole = [[Fence alloc] initFence:onFencePole fenceType:2 fencePos:currentTapLoc]; } [fencePoleArray addObject:fencePole]; [fencePole release]; and whenever I press a button in the game, endOpenState is called to clear away all the extra images(fence/poles) on the screen and also to remove all existing objects in the 3 NSMutableArray -(void)endOpenState { ........ int xMax = [fencePoleArray count]; int yMax = [fenceImageArray count]; for (int x = 0; x < xMax; x++) { [[fencePoleImageArray objectAtIndex:x] removeFromSuperview]; } for (int y = 0; y < yMax; y++) { [[fenceImageArray objectAtIndex:y] removeFromSuperview]; } [fencePoleArray removeAllObjects]; [fencePoleImageArray removeAllObjects]; [fenceImageArray removeAllObjects]; ........ } The crash happens here at the checkFence function. -(BOOL)checkFence { if (onFencePole == 0) { return YES; } else if (onFencePole >= 1 && onFencePole < currentMaxFencePole - 1) { CGPoint tempPoint1 = currentTapLoc; CGPoint tempPoint2 = [[fencePoleArray objectAtIndex:onFencePole-1] returnPos]; // the crash happens at this line if ([self checkDistance:tempPoint1 point2:tempPoint2]) { return YES; } else { return NO; } } else if (onFencePole == currentMaxFencePole - 1) { ...... } else { return NO; } } What I'm thinking of is that fencePoleArray got messed up when I used [fencePoleArray removeAllObjects] because it doesn't crash when I comment it out. It would really be great if someone can explain to me what went wrong. And thanks in advance.

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• Cocoa structs and NSMutableArray

  - by Circle

  I have an NSMutableArray that I'm trying to store and access some structs. How do I do this? 'addObject' gives me an error saying "Incompatible type for argument 1 of addObject". Here is an example ('in' is a NSFileHandle, 'array' is the NSMutableArray): //Write points for(int i=0; i<5; i++) { struct Point p; buff = [in readDataOfLength:1]; [buff getBytes:&(p.x) length:sizeof(p.x)]; [array addObject:p]; } //Read points for(int i=0; i<5; i++) { struct Point p = [array objectAtIndex:i]; NSLog(@"%i", p.x); }

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