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• IOS Variable vs Property

  - by William Smith

  Just started diving into Objective-C and IOS development and was wondering when and the correct location I should be declaring variables/properties. The main piece of code i need explaining is below: Why and when should i be declaring variables inside the interface statement and why do they have the same variable with _ and then the same one as a…

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• NSInvalidArgumentException: *** -[NSPlaceholderString initWithFormat:locale:arguments:]: nil argumen

  - by BU

  I have no idea where in my code is causing this problem. Can someone please take a look and let me know what I am missing? The code is relatively straightforward. +(void)processGetGameOffersByGameWithReply:(NSDictionary *)responseDictionary { GameOffer *gameOffer; @try { SharedResources *s = [SharedResources instance]; …

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• iPhone Objective C - error: pointer value used where a floating point value was expected

  - by Mausimo

  I do not understand why i am getting this error. Here is the related code: Photo.h #import <CoreData/CoreData.h> @class Person; @interface Photo : NSManagedObject { } @property (nonatomic, retain) NSData * imageData; @property (nonatomic, retain) NSNumber * Latitude; @property (nonatomic, retain) NSString * ImageName;…

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• Sharing a UIView between UIViewControllers in a UITabBarController

  - by Wireless Designs

  Hi all - I have a UIScrollView that houses a gallery of images the user can scroll through. This view needs to be visible on each of three separate UIViewControllers that are housed within a UITabBarController. Right now, I have three separate UIScrollView instances in the UITabBarController subclass, and the controller manages…

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• issues make a persistent object in Objective C

  - by oden

  Attempting to make a NSObject called 'Person' that will hold the login details for my application (nothing to fancy). The app is made of a navigation controller with multiple table views but I am having issues sharing the Person object around. Attempted to create a static object like this: + (Person *)sharedInstance { static…

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• how to generate an event

  - by user262325

  Hello everyone I created a subclass from UIView #import <UIKit/UIKit.h> @interface MeeSelectDropDownView : UIView { UILabel *mainText; UIImage *bgImg; UIImageView *bgView; UIImageView *originView; NSMutableArray *labelArray; int selectedItem; BOOL inSelectTag; float _defaultHeight; } …

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• Memory Leaks - Objective-C

  - by reising1

  Can anyone help point out memory leaks? I'm getting a bunch within this method and I'm not sure exactly how to fix it. - (NSMutableArray *)getTop5AndOtherKeysAndValuesFromDictionary:(NSMutableDictionary *)dict { NSLog(@"get top 5"); int sumOfAllValues = 0; NSMutableArray *arr = [[[NSMutableArray alloc] init]…

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• NSXMLParser & memory leaks

  - by HBR

  Hi, I am parsing an XML file using a custom class that instanciates & uses NSXMLParser. On the first call everything is fine but on the second, third and later calls Instruments show tens of memory leaks on certain lines inside didEndElement, didEndElement and foundCharacters functions. I googled it and found some…

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• How to resolve warning about does not implement the 'UIActionSheetDelegate' protocol

  - by RAGOpoR

  here is my .h code @interface ROSettingViewController : UITableViewController { UISwitch *switchCtl; UISwitch *switchCtl1; NSArray *dataSourceArray; } @property (nonatomic, retain, readonly) UISwitch *switchCtl; @property (nonatomic, retain, readonly) UISwitch…

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• NSOperation unable to load data on the TableView

  - by yeohchan

  I have a problem in NSOperation. I tried many ways but it would run behind the screen, but will not make it appear on the my table view. Can anyone help me out with this. I am new to NSOperation. Recents.h #import <UIKit/UIKit.h> #import "FlickrFetcher.h" @interface Recents : UITableViewController { …

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• objective c- property

  - by Amir

  Hello all , I think i am missing somthing with property attributes. first i cant understand the different between retain and assign? If i use assign does the property increase the retain counter by 1 to the setter and also to the getter, and i need to use release to both of them? and how this work with…

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• should variable be released or not? iphone-sdk

  - by psebos

  Hi, In the following piece of code (from a book) data is an NSDictionary *data; defined in the header (no property). In the viewDidLoad of the controller the following occurs: - (void)viewDidLoad { [super viewDidLoad]; NSArray *keys = [NSArray arrayWithObjects:@"home", @"work", nil]; …

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• Core Data @sum aggregate

  - by nasim

  I am getting an exception when I try to get @sum on a column in iPhone Core-Data application. My two models are following - Task model: @interface Task : NSManagedObject { } @property (nonatomic, retain) NSString * taskName; @property (nonatomic, retain) NSSet* completion; @end @interface…

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• Get EXEC_BAD_ACCESS when I get the NSFileModificationDate

  - by Toto

  Hi everyone, I try to get the last modification date of a file: NSFileManager *fm = [[NSFileManager alloc] init]; NSError *err; NSDate *lastModif = [[fm attributesOfItemAtPath:filename error:&err] objectForKey:NSFileModificationDate];//filename is ok ;-) if(err == nil) { [lastModif…

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• I want to get the value from one class (SearchTableViewController.m) to another class (HistoryTableV

  - by ahmet732

  #import <UIKit/UIKit.h> @class SearchDetailViewController; @interface SearchTableViewController : UITableViewController <UISearchBarDelegate, UITableViewDelegate, UITableViewDataSource>{ IBOutlet UITableView *myTableView; NSMutableArray *tableData;//will be storing data that…

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• iPhone memory management

  - by Prazi

  I am newbie to iPhone programming. I am not using Interface Builder in my programming. I have some doubt about memory management, @property topics in iPhone. Consider the following code @interface LoadFlag : UIViewController { UIImage *flag; UIImageView *preview; } @property…

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• how to set Custom attribute of NSManagedObject which is calculated from other attributes ?

  - by Kundan

  I am using core data framework to manage objects.i have an entity which has several attributes of decimal types. Among them is attribute which is mathematically calculated from other attributes. Ex :- @interface Marks : NSManagedObject { } @property (nonatomic, retain)…

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• Need help with NSString that returns (null)

  - by Guy Dor

  Hi, I have a problem with my string that returns (null) Here's the MainViewController: NSString *leftWebViewUrl; MainViewController *mainViewController; @property (nonatomic, retain) NSString *leftWebViewUrl; @property (nonatomic, retain) MainViewController…

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• Core Data produces Analyzer warnings

  - by RickiG

  Hi I am doing the final touch ups on an app and I am getting rid of every compiler/analyzer warning. I have a bunch of Class methods that wrap my apps access to Core Data entities. This is "provoking" the analyzer. + (CDProductEntity*) newProductEntity { …

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• Is it possible to customize @synthesized properties?

  - by Dan K.

  I'm probably just being a bit lazy here, but bear with me. Here's my situation. I have a class with two nonatomic, retained properties. Let's say: @property (nonatomic, retain) UITextField *dateField; @property (nonatomic, retain) NSDate *date; I…

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• Objective-C: alloc of object within init of another object (memory management)

  - by Stefan Klumpp

  In my .h file I have: NSMutableArray *myArray; @property (nonatomic, retain) NSMutableArray *myArray; My .m file looks basically like this: @synthesize myArray; - (id) init { self = [super init]; if (self != nil) { …

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• Objective C memory management question with NSArray

  - by Robert

  I am loading an array with floats like this: NSArray *arr= [NSArray arrayWithObjects: [NSNumber numberWithFloat:1.9], [NSNumber numberWithFloat:1.7], [NSNumber numberWithFloat:1.6], …

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• Declared Properties and assigning values with self

  - by Shaun Budhram

  I understand how declared properties work - I just need a clarification on when Objective C is using the accessor method vs. when it is not. Say I have a property declared using retain: @property (nonatomic, retain) NSDate *date; ... and…

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• How can I prevent an app from leaving full screen mode when I move the cursor to another display?

  - by dan

  When I have dual displays set up, or when I am using Synergy to use one keyboard and mouse across two computers/screens, I can't seem to retain F11 full screen mode for the top application when I mouse out of that screen. This applies to…

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• iPhone Serialization problem

  - by Jenicek

  Hi, I need to save my own created class to file, I found on the internet, that good approach is to use NSKeyedArchiver and NSKeyedUnarchiver My class definition looks like this: @interface Game : NSObject <NSCoding> { …

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