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• Why doesn't NSDateFormatter return a NSString?

  - by TheLearner

  Why does this message not return a string: NSDate *today = [NSDate date]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; NSString *formattedDate = (@"Date for today %@:", [dateFormatter stringFromDate:today]);

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• How to call a method in init method ?

  - by srikanth rongali

  My program looks like this: -(id)init { if ( (self = [super init]) ) { //TargetWithActions *targetActions= [[TargetWithActions alloc] init]; [self countDownSpeed123]; } return self; } -(void)countDownSpeed123 { countDownSpeed = 5.0f; } @end warning: 'TargetWithActions' may not respond to '-countDownSpeed123' I am getting the warning in this way. Where I am wrong in my program. Please explain ? Thank You.

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• display original image color with UIBarButtonItem

  - by user262325

  I used codes below to display a image on an UIBarButtonItem UIBarButtonItem *myButtonItem; myButtonItem= [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"image.png"] style:UIBarButtonItemStylePlain target:self action:@selector(pressB:)]; but the image color is two colors(red/blue), but the image displayed on the ButtonItem is white. Iy looks like IOS change it to white color automatically. Welcome any comment

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• Sending an image in a faceless email

  - by anurag

  I am trying to send a faceless email (sending an email without showing the interface), using the code below. I also want to attach an image to this email. Is this possible? - (void) sendEmailTo:(NSString *)toStr withSubject:(NSString *)subjectStr withBody:(NSString *)bodyStr { NSString *emailString=[[NSString alloc] initWithFormat:@"mailto:?to=%@&subject=%@&body=%@", [toStr stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding], [subjectStr stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding], [bodyStr stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]]; [[UIApplication sharedApplication] openURL:[NSURL URLWithString:emailString]]; [emailString release]; }

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• memory management objective c - returning objects from methods

  - by geeth

  Hi, Please clarify, how to deal with returned objects from methods? Below, I get employee details from GeEmployeetData function with autorelease, 1. Do I have to retain the returned object in Process method? 2. Can I release *emp in Process fucntion? -(void) Process { Employee *emp = [self GeEmployeetData] } +(Employee*) GeEmployeetData{ Employee *emp = [[Employee alloc]init]; //fill entity return [emp autorelease]; }

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• Memory handling problem with UIViewController and pushViewController

  - by Infinity

  MyViewController *myViewController = [[MyViewController alloc] initWithMagInfo:magInfo]; [self.navigationController pushViewController:myViewController animated:YES]; [myViewController release]; The MyViewController class is an UIViewController. And the problems come in his dealloc method at the line [super dealloc]; Why can it happen?

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• [self removeFromSuperview] not doing dealloc

  - by jonydep

  i have this in the superview: mySubView = [[MySubView alloc] init]; [self addSubview:mySubView]; [mySubView release]; then at some point later, in the sub view, this: [self removeFromSuperview]; when i debug it, i notice that the dealloc for the subview is never called, even though i'm fairly sure the reference count should be 0. any ideas why this might be? thanks.

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• Error found - too many arguments to method call expected 1 have 2 - in app email

  - by Anthony Farah

  There seems to be an error with my coding, and it says that there are to many nils or something I need help MFMailComposeViewController *composer = [[MFMailComposeViewController alloc]init]; if ([MFMailComposeViewController canSendMail]) { [composer setToRecipients:[NSArray arrayWithObject:@"[email protected]", nil]]; [composer setSubject:nil];[composer setMailComposeDelegate:self]; [composer setMessageBody:nil isHTML:YES]; [composer setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal];

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• a Problem to pass a string between 2 view controller (iPhone)

  - by Toma

  my problem is quite simple, but as a beginner, I'm lost :D I have to view controller : view one call view 2 like this : self.FacebookTypeRequest =@"favoris"; FaceBookViewController *viewcontrol = [[FaceBookViewController alloc]initWithNibName:@"FaceBookViewController" bundle:[NSBundle mainBundle]]; viewcontrol.title = @"FaceBook"; [self.navigationController pushViewController:viewcontrol animated:YES]; [viewcontrol release]; How can i send my string facebookTypeRequest to my view controller 2 ? Thanks for your help

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• Convert NSString to string

  - by coure06

  NSDate *now = [NSDate date]; NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy"]; NSString *stringFromDate = [formatter stringFromDate:now]; CGContextShowTextAtPoint(context, 50, 50, stringFromDate, 5); I am not getting the exact date? also getting warning while compiling warning: passing argument 4 of 'CGContextShowTextAtPoint' from incompatible pointer type

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• How to format date from string?

  - by 4thSpace

  I have a string with this value: 2010-05-13 23:17:29 I'd like to format it and am using the following code: NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; formatter.dateStyle = NSDateFormatterMediumStyle; NSDate *formattedDate = [formatter dateFromString:dateString]; [formatter release]; When the debugger reaches the release line, formattedDate shows "invalid CFStringRef" and Cannot access memory at address 0x0 Any ideas what I'm doing wrong?

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• iPhone/iPad - issues with NavigationBar button ?

  - by user532445

  I my application i have added button in NavigationBar like this.. UIBarButtonItem *more=[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"search-25by25.png"] style:UIBarButtonItemStylePlain target:self action:@selector(SelectMission:)]; self.navigationItem.rightBarButtonItem = more; When i am clicking on button application get's shutdown... If i am doing same thing with normal button it's working fine can any one help me why it's behaving like this?

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• load the videos in ipod/iphone library but always crash

  - by user262325

  Hello everyone I hope to load the videos in ipod/iphone library and list in UITableView like app 'videos'. the codes show below, but it always cause crash UIImagePickerController *picker=[[UIImagePickerController alloc]init]; picker.sourceType= UIImagePickerControllerSourceTypePhotoLibrary; picker.mediaTypes = [NSArray arrayWithObject:kUTTypeMovie]; picker.delegate = self; Welcome any comment Thanks interdeb

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• core plot error?

  - by senthilmuthu

  hi, i am using core plot framework,when i run following code in viewdidload gives crash.the view is as custom view... graph = [(CPXYGraph *)[CPXYGraph alloc] initWithFrame:CGRectZero]; CPLayerHostingView *hostingView = (CPLayerHostingView *)self.view; hostingView.hostedLayer = graph;**(gives error)** what i have to do? any help please?

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• PRoblems Running Core Plot Tuorial

  - by Nick LaMarca

  I am following the tutorial here about core plot here.... http://www.switchonthecode.com/tutorials/using-core-plot-in-an-iphone-application I am getting errors with the following lines of code //SAYING INCOMPATIBLE TYPE FOR AURGUMENT 1 'setMajorIntervalLength' axisSet.xAxis.majorIntervalLength = [NSDecimalNumber decimalNumberWithString:@"5"]; // request for member 'axisLabelOffset' in something not a structure or union axisSet.xAxis.axisLabelOffset = 3.0f; //request for member 'bounds' in something not a structure or union CPScatterPlot *xSquaredPlot = [[[CPScatterPlot alloc] initWithFrame:graph.defaultPlotSpace.bounds] autorelease];

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• static NSStrings in Objective-C

  - by MikeyWard

  I frequently see a code snippet like this in class instance methods: static NSString *myString = @"This is a string."; I can't seem to figure out why this works. Is this simply the objc equivalent of a #define that's limited to the method's scope? I (think) I understand the static nature of the variable, but more specifically about NSStrings, why isn't it being alloc'd, init'd? Thanks~

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• How come this object is released right after it's instantiated? From a book example I'm learning fro

  - by HD-VRSCA

  BlueViewController *blueController = [[ BlueViewController alloc] initWithNibName:@"BlueView" bundle:nil]; self.blueViewController = blueController; [self.view insertSubview:blueController.view atIndex:0]; [blueController release];

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• expecte ')' before className

  - by Akbarbuneri

  Hi I have a class DataObject as Header ::: #import <Foundation/Foundation.h> @interface DataObject : NSObject { NSString *erorrMessage; BOOL hasError; NSDictionary *dataValues; } @property(nonatomic, retain)NSString *erorrMessage; @property(nonatomic)BOOL hasError; @property(nonatomic, retain)NSDictionary *dataValues; @end Class Implementation:::: #import "DataObject.h" @implementation DataObject @synthesize erorrMessage; @synthesize hasError; @synthesize dataValues; @end And I have another class as DataManager Header as :::: #import <Foundation/Foundation.h> @interface DataManager : NSObject - (DataObject *)getData :(NSString*)url; @end Implementation :::: #import "DataManager.h" #import "DataObject.h" #import "JSON.h" @implementation DataManager - (DataObject *)getData :(NSString*)url{ DataObject* dataObject = [[DataObject alloc]init]; NSString *urlString = [NSString stringWithFormat:url]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]; //TODO: Here we have to check the internet connection before requesting. NSError * erorrOnRequesting; NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&erorrOnRequesting]; NSString* responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; if( erorrOnRequesting != nil) { dataObject.hasError = YES; dataObject.erorrMessage = @"Error on requsting to the web server"; return dataObject; } NSError *errorOnParsing; SBJSON *json = [[SBJSON new] autorelease]; NSDictionary *dataValues = [json objectWithString:responseString error:&errorOnParsing]; [responseString release]; if(errorOnParsing != nil) { //TODO: We have to send the website a feedback that there is some problem on the server end. dataObject.hasError = YES; dataObject.erorrMessage = @"Error on parsing, the server returned invalid data."; return dataObject; } dataObject.hasError = NO; dataObject.dataValues = dataValues; return dataObject; } @end Now when I build I got an error in the DataManager header where I #import Dataobject header, it says "error: expected')' before DataObject" I don;t understand what I miss. Thanks for the help..

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• Issue when rotating a UIScrollView

  - by leachianus.gecko

  I am having issues trying to get the pageControl sample code to work with rotation. I managed to get it to rotate but it does not visually load correctly until I start to scroll (then it works fine). Any Idea on how I can fix this problem? Here is a link to the project if you want to see it in action. This code is based off the PageControl example apple has provided. here is the code: #import "ScrollingViewController.h" #import "MyViewController.h" @interface ScrollingViewController (PrivateMethods) - (void)loadScrollViewWithPage:(int)page; @end @implementation ScrollingViewController @synthesize scrollView; @synthesize viewControllers; - (void)viewDidLoad { amount = 5; [super viewDidLoad]; [self setupPage]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (void)viewDidUnload { [scrollView release]; } - (void)dealloc { [super dealloc]; } - (void)setupPage { NSMutableArray *controllers = [[NSMutableArray alloc] init]; for (unsigned i = 0; i < amount; i++) { [controllers addObject:[NSNull null]]; } self.viewControllers = controllers; [controllers release]; // a page is the width of the scroll view scrollView.pagingEnabled = YES; scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * amount, 200); scrollView.showsHorizontalScrollIndicator = NO; scrollView.showsVerticalScrollIndicator = NO; scrollView.scrollsToTop = NO; scrollView.delegate = self; [self loadScrollViewWithPage:0]; [self loadScrollViewWithPage:1]; } #pragma mark - #pragma mark UIScrollViewDelegate stuff - (void)scrollViewDidScroll:(UIScrollView *)_scrollView { if (pageControlIsChangingPage) { return; } /* * We switch page at 50% across */ CGFloat pageWidth = _scrollView.frame.size.width; int dog = floor((_scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1; // pageControl.currentPage = page; [self loadScrollViewWithPage:dog - 1]; [self loadScrollViewWithPage:dog]; [self loadScrollViewWithPage:dog + 1]; } - (void)loadScrollViewWithPage:(int)page { if (page < 0) return; if (page >= amount) return; MyViewController *controller = [viewControllers objectAtIndex:page]; if ((NSNull *)controller == [NSNull null]) { controller = [[MyViewController alloc] initWithPageNumber:page]; [viewControllers replaceObjectAtIndex:page withObject:controller]; [controller release]; } if (nil == controller.view.superview) { CGRect frame = scrollView.frame; frame.origin.x = frame.size.width * page; frame.origin.y = 0; controller.view.frame = frame; [scrollView addSubview:controller.view]; } } - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { [self setupPage]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return YES; } @end

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• Add objects to NSMutableArray

  - by iorf

  I'm trying to add objects to NSMutableArray (categoriasArray), but its not done by the iterator: @synthesize categoriasArray; for (int i = 0; i < [categories count]; i++) { categoria *cat = [[categoria alloc] initWithDictionary:[categories objectAtIndex:i]]; [self.categoriasArray addObject:cat]; cat=nil; } After the for iterator, categoriasArray has 0 objects. Many thanks

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• How can I change the background image view transparency image?

  - by Tattat

  It is the code: self.view.backgroundColor= [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"yourimage.png"]]; My "yourimage.png" have some space that is transparency. But it shows me it becomes black. How can I change it to show the transparency instead of black color? thz.

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• Objective c: How to use memory managment properly for asynchronous methods

  - by user296446

  I need to call a method that starts some asynchronous code MyClass* myClass = [[MyClass alloc] init]; [myClass startAsynchronousCode]; Now I cant simply release it as this would cause an error since the code is still running: [myClass release]; // causes an error What is the best way to deal with the memory?

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• problem with get http request from IPhone

  - by user317192

  Hi, I am writing a sample PHP Web Service that is sending GET Http request from the iphone to the web server. The server side code is returning JSON Data to iphone, the server side code looks like: function getUsers(){ $con=mysql_connect("localhost","root","123456") or die(mysql_error()); if(!mysql_select_db("eventsfast",$con)) { echo "Unable to connect to DB"; exit; } $sql="SELECT * from users"; $result=mysql_query($sql); if(!$result) { die('Could not successfully run query Error:'.mysql_error()); } $data = array(); while($row = mysql_fetch_assoc($result)){ $data['username'][] = $row['username']; $data['password'][]= $row['password']; } mysql_close($con); //print_r(json_encode($data)); //return (json_encode($data)); return json_encode('success'); } getUsers(); ? Its a simple code that Fetches all the data from the user table and send it to the iphone application. *****************************************************IPHONE APPLICATION (void)viewDidLoad { [super viewDidLoad]; responseData = [[NSMutableData data] retain]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:8888/GetData.php"]]; [[NSURLConnection alloc] initWithRequest:request delegate:self]; } (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [responseData setLength:0]; } (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [responseData appendData:data]; } (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { label.text = [NSString stringWithFormat:@"Connection failed: %@", [error description]]; } (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; [responseData release]; NSError *error; SBJSON *json = [[SBJSON new] autorelease]; NSArray *luckyNumbers = [json objectWithString:responseString error:&error]; [responseString release]; if (luckyNumbers == nil) label.text = [NSString stringWithFormat:@"JSON parsing failed: %@", [error localizedDescription]]; else { NSMutableString *text = [NSMutableString stringWithString:@"Lucky numbers:\n"]; for (int i = 0; i < [luckyNumbers count]; i++) [text appendFormat:@"%@\n", [luckyNumbers objectAtIndex:i]]; NSLog(text); label.text = text; } } ********************PROBLEM**************** The problem is that nothing is coming on iphone side of the application........... the response doesn't contains anything.............. Please help..............

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• Potential leak of an object allocated

  - by idober

  Using the build and analyze of XCode I saw i have a memory leak in my code: - (NSString *) doIt { NSString *var = [[NSString alloc] init]; return var; } This is of course a simplified snippet of my problem where do i release the object?

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• need advise about NSClassFromString

  - by RAGOpoR

  according to this code i dont understand about NSClassFromString how did i know "viewControllerName" can i use it from another source ? could you please tell me more information how to use NSClassFromString? UIViewController *viewController = [[NSClassFromString(viewControllerName) alloc] init];

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