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  • sigleton EXC_BAD_ACCESS

    - by lclaud
    Hi, so I have a class that I decleare as a singleton and in that class I have a NSMutableArray that contains some NSDictionaries with some key/value pairs in them. The trouble is it doesn't work and I dont't know why... I mean it crashes with EXC_BAD_ACCESS but i don't know where. I followed the code and it did create a new array on first add, made it to the end of the funtion ..and crashed ... @interface dataBase : NSObject { NSMutableArray *inregistrari; } @property (nonatomic,retain) NSMutableArray *inregistrari; -(void)adaugaInregistrareCuData:(NSDate *)data siValoare:(NSNumber *)suma caVenit:(BOOL)venit cuDetaliu:(NSString *)detaliu; -(NSDictionary *)raportIntreData:(NSDate *)dataInitiala siData:(NSDate *)dataFinala; -(NSArray *)luniDisponibileIntreData:(NSDate *)dataInitiala siData:(NSDate *)dataFinala; -(NSArray *)aniDisponibiliIntreData:(NSDate *)dataInitiala siData:(NSDate *)dataFinala; -(NSArray *)vectorDateIntreData:(NSDate *)dataI siData:(NSDate *)dataF; -(void)salveazaInFisier; -(void)incarcaDinFisier; + (dataBase *)shareddataBase; @end And here is the .m file #import "dataBase.h" #import "SynthesizeSingleton.h" @implementation dataBase @synthesize inregistrari; SYNTHESIZE_SINGLETON_FOR_CLASS(dataBase); -(void)adaugaInregistrareCuData:(NSDate *)data siValoare:(NSNumber *)suma caVenit:(BOOL)venit cuDetaliu:(NSString *)detaliu{ NSNumber *v=[NSNumber numberWithBool:venit]; NSArray *input=[NSArray arrayWithObjects:data,suma,v,detaliu,nil]; NSArray *keys=[NSArray arrayWithObjects:@"data",@"suma",@"venit",@"detaliu",nil]; NSDictionary *inreg=[NSDictionary dictionaryWithObjects:input forKeys:keys]; if(inregistrari == nil) { inregistrari=[[NSMutableArray alloc ] initWithObjects:inreg,nil]; }else { [inregistrari addObject:inreg]; } [inreg release]; [input release]; [keys release]; } It made it to the end of that adaugaInregistrareCuData ... ok . said the array had one object ... and then crashed

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  • problem in adding image to the UIButton.

    - by monish
    Hi friends, I got an another problem in my application and I am wasting so much of time on that. Does pls anyone can help with this problem. Actually I had an Event and I should give rating for that event for that I wrote the code as: In CellForRowAtIndexPath......I had the code as: - (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MasterViewIdentifier"]; //UITableViewCell *cell = nil; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"MasterViewIdentifier"] autorelease]; cell.selectionStyle = UITableViewCellSelectionStyleNone; UIView* elementView = [[UIView alloc] initWithFrame:CGRectMake(20,170,320,280)]; elementView.tag = 0; elementView.backgroundColor=[UIColor clearColor]; [cell.contentView addSubview:elementView]; [elementView release]; } UIView* elementView = [cell.contentView viewWithTag:0]; elementView.backgroundColor=[UIColor clearColor]; for(UIView* subView in elementView.subviews) { [subView removeFromSuperview]; } if(indexPath.section == 8) { UIImage *whiteImg = [UIImage imageNamed:@"white_star.png"] ; UIImage *yellowImg = [UIImage imageNamed:@"yellow_Star.png"] ; UIButton *button1 = [[UIButton alloc]initWithFrame:CGRectMake(159, 15, 25, 20)]; [button1 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; button1.tag = 1; UIButton *button2 = [[UIButton alloc]initWithFrame:CGRectMake(185, 15, 25, 20)]; [button2 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; button2.tag = 2; UIButton *button3 = [[UIButton alloc]initWithFrame:CGRectMake(211, 15, 25, 20)]; [button3 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; button3.tag = 3; UIButton *button4 = [[UIButton alloc]initWithFrame:CGRectMake(237, 15, 25, 20)]; [button4 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; button4.tag = 4; UIButton *button5 = [[UIButton alloc]initWithFrame:CGRectMake(263, 15, 25, 20)]; [button5 addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside]; button5.tag = 5; if(event.eventRatings == 1) { [button1 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button2 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button3 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button4 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button5 setBackgroundImage:whiteImg forState:UIControlStateNormal]; } else if(event.eventRatings == 2) { [button1 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button2 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button3 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button4 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button5 setBackgroundImage:whiteImg forState:UIControlStateNormal]; } else if(event.eventRatings == 3) { [button1 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button2 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button3 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button4 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button5 setBackgroundImage:whiteImg forState:UIControlStateNormal]; } else if(event.eventRatings == 4) { [button1 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button2 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button3 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button4 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button5 setBackgroundImage:whiteImg forState:UIControlStateNormal]; } else if(event.eventRatings == 5) { [button1 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button2 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button3 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button4 setBackgroundImage:yellowImg forState:UIControlStateNormal]; [button5 setBackgroundImage:yellowImg forState:UIControlStateNormal]; } else { [button1 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button2 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button3 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button4 setBackgroundImage:whiteImg forState:UIControlStateNormal]; [button5 setBackgroundImage:whiteImg forState:UIControlStateNormal]; } [elementView addSubview:button1]; [button1 release]; [elementView addSubview:button2]; [button2 release]; [elementView addSubview:button3]; [button3 release]; [elementView addSubview:button4]; [button4 release]; [elementView addSubview:button5]; [button5 release]; if(isRightButton == YES) { button1.enabled = NO; button2.enabled = NO; button3.enabled = NO; button4.enabled = NO; button5.enabled = NO; } else if(isRightButton == NO) { button1.enabled = YES; button2.enabled = YES; button3.enabled = YES; button4.enabled = YES; button5.enabled = YES; } [elementView addSubview:ratingsTitleLabel]; cell.accessoryType = UITableViewCellAccessoryNone; } return cell; } And the action of the button is written as: -(void)buttonAction:(id)sender { rating = [sender tag]; printf("\n Ratig Value inside Button Action~~~~~~~~~~~~~~~~%d",rating); event.eventRatings = rating; [tableView reloadData]; } When I build the application in simlator of 3.1.2 O.S its working fine by displaying the star images. My porblem is when I build it in 3.1.2 O.S Device the images are not displaying.I checked the code for casesensitivity in file name and its gud but Im not gettig the images to display. Guys help me to solve this. Thank you, Monish Kumar.

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  • Retain Count Question: Some Guidance, Please

    - by yar
    [I'm sure this is not odd at all, but I need just a bit of help] I have two retain properties @property (nonatomic, retain) NSArray *listContent; @property (nonatomic, retain) NSArray *filteredListContent; and in the viewDidLoad method I set the second equal to the first (so now the retainCount is two, I think): self.filteredListContent = self.listContent; and then on every search I do this self.filteredListContent = [listContent filteredArrayUsingPredicate:predicate]; I thought I should do a release right above this assignment -- since the property should cause an extra retain, right? -- but that causes the program to explode the second time I run the search method. The retain counts (without the extra release) are 2 the first time I come into the search method, and 1 each subsequent time (which is what I expected, unfortunately). Some guidance would help, thanks! Is it correct to not release?

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  • iPhone OS: making a switch statement that uses string literals as comparators instead of integers

    - by nickthedude
    So i'd like to do this: switch (keyPath) { case @"refreshCount": //do stuff case @"timesLaunched": //do other stuff } but apparently you can only use integers as the switch quantity. Is the only way to do this parse the string into an integer identifier and then run the switch statement? like this: nsinteger num = nil; if (keyPath isEqual:@"refreshCount") { num = 0 } if (keyPath isEqual:@"timesLaunched") { num = 1 } I'm trying to optimize this code to be as quick as possible because its going to get called quite often. thanks, Nick

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  • Convert NSData into Hex NSString

    - by Dawson
    With reference to the following question: Convert NSData into HEX NSSString I have solved the problem using the solution provided by Erik Aigner which is: NSData *data = ...; NSUInteger capacity = [data length] * 2; NSMutableString *stringBuffer = [NSMutableString stringWithCapacity:capacity]; const unsigned char *dataBuffer = [data bytes]; NSInteger i; for (i=0; i<[data length]; ++i) { [stringBuffer appendFormat:@"%02X", (NSUInteger)dataBuffer[i]]; } However, there is one small problem in that if there are extra zeros at the back, the string value would be different. For eg. if the hexa data is of a string @"3700000000000000", when converted using a scanner to integer: unsigned result = 0; NSScanner *scanner = [NSScanner scannerWithString:stringBuffer]; [scanner scanHexInt:&result]; NSLog(@"INTEGER: %u",result); The result would be 4294967295, which is incorrect. Shouldn't it be 55 as only the hexa 37 is taken? So how do I get rid of the zeros? EDIT: (In response to CRD) Hi, thanks for clarifying my doubts. So what you're doing is to actually read the 64-bit integer directly from a byte pointer right? However I have another question. How do you actually cast NSData to a byte pointer? To make it easier for you to understand, I'll explain what I did originally. Firstly, what I did was to display the data of the file which I have (data is in hexadecimal) NSData *file = [NSData dataWithContentsOfFile:@"file path here"]; NSLog(@"Patch File: %@",file); Output: Next, what I did was to read and offset the first 8 bytes of the file and convert them into a string. // 0-8 bytes [file seekToFileOffset:0]; NSData *b = [file readDataOfLength:8]; NSUInteger capacity = [b length] * 2; NSMutableString *stringBuffer = [NSMutableString stringWithCapacity:capacity]; const unsigned char *dataBuffer = [b bytes]; NSInteger i; for (i=0; i<[b length]; ++i) { [stringBuffer appendFormat:@"%02X", (NSUInteger)dataBuffer[i]]; } NSLog(@"0-8 bytes HEXADECIMAL: %@",stringBuffer); As you can see, 0x3700000000000000 is the next 8 bytes. The only changes I would have to make to access the next 8 bytes would be to change the value of SeekFileToOffset to 8, so as to access the next 8 bytes of data. All in all, the solution you gave me is useful, however it would not be practical to enter the hexadecimal values manually. If formatting the bytes as a string and then parsing them is not the way to do it, then how do I access the first 8 bytes of the data directly and cast them into a byte pointer?

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  • Need little assistance

    - by Umaid
    I am iterating in current days, so need little assistance for (int I=-1; I<30; I++) { for (int J=0; J=30; J++) { for (int K=1; K=30; K++) { SELECT rowid,Month, Day, Advice from MainCategory where Month= 'May ' and Day in ((cast(strftime('%d',date('now','I day')) as Integer)),(cast(strftime('%d',date('now','J day')) as Integer)),(cast(strftime('%d',date('now','K day')) as Integer))); } } } What if i want to go in reverse order also for (int I=-1; I<30; I--) { for (int J=0; J=30; J--) { for (int K=1; K=30; K--) { SELECT rowid,Month, Day, Advice from MainCategory where Month= 'May ' and Day in ((cast(strftime('%d',date('now','I day')) as Integer)),(cast(strftime('%d',date('now','J day')) as Integer)),(cast(strftime('%d',date('now','K day')) as Integer))); } } } On every previous click, i want to fetch 3 records so do i need to iterate till 3 or make it on all record 30 in a month from which i want to fetch.

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  • How, exactly, does the double-stringize trick work?

    - by Peter Hosey
    At least some C preprocessors let you stringize the value of a macro, rather than its name, by passing it through one function-like macro to another that stringizes it: #define STR1(x) #x #define STR2(x) STR1(x) #define THE_ANSWER 42 #define THE_ANSWER_STR STR2(THE_ANSWER) /* "42" */ Example use cases here. This does work, at least in GCC and Clang (both with -std=c99), but I'm not sure how it works in C-standard terms. Is this behavior guaranteed by C99? If so, how does C99 guarantee it? If not, at what point does the behavior go from C-defined to GCC-defined?

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  • What can I read from the iPad Camera Connection Kit?

    - by HELVETICADE
    I'm building a small controller device that I'd like to partner with a computer. I've settled on using OSC out from my custom built hardware and am pretty satisfied with what I can get from WOscLib. Two goals I'd like to achieve are portability and a very ratio between battery:computing power, and this has lured me towards using iPhoneOS to accomplish my goals. I think the iPad would suit my needs perfectly, except that using wifi to broadcast OSC out from my device requires a third device and would destroy the goal of portability, whilst also introducing potential latency and stability headaches. My question is pretty simple: Can I push my OSC-out FROM my controller TO an iPad via USB and the Camera Connection Kit? If I could accomplish this, the two major goals of my project would be fulfilled very nicely. This seems like it should be a simple little question, but researching this obsessively over the past few weeks has left me more almost more uncertain than if I had done no research at all. I'd really like some more confidence before I go down this route, and it seems like it should be possible. Any insight would be very, very appreciated.

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  • UItableView Problem in deleting items from database

    - by Arun Sharma
    Hi All, I am using in UitableView database.My table view works successfully (add single item,add multiple item,delete all) only problem is there when i want to delete single item for this i using Uitableview edit option. so how i add database method for deleting single item from database and also from table view. Please help me.

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  • iPhone SDK Question with Audio/Mic

    - by Henry D'Andrea
    I am trying to do an app, to where when it launches, it will detect audio, and then play it back automatically. NO BUTTONS, nothing to press. Just a picture of something then, it listens for audio, then plays it back. Similar to the Talking Carl app in the App Store. Any ideas/help? Would appreciate it, if i could use the code with IB.

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  • How can i see if dealloc is being called on a uikit object, or any object not created by myself

    - by Gyozo Kudor
    I think i have an UIImage that has a higher retain count than it should have and i am probably leaking memory. I use this image as a thumbnail, to set a custom background to a uibutton. So the uibutton is holding a reference to it and so do i. But instead of 2, the retainCount is 3. Do i have to create a custom UIImage derived class and override dealloc if I want to place a log message there and then change the class used from UIImage to my class, or is there an easier way. Thanks in advance.

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  • Assigning a view controller to be the delegate of a subview which is not directly descendent?

    - by ambertch
    I am writing an iphone app where in numerous cases a subview needs to talk to its superview. For example: View A has a table view that contains photos A has a subview B which allows users to add photos, upon which I want to auto append them to A's table view So far I have been creating a @protocol in B, and registering A as the delegate. The problem in my case is that B has a subview C that allows users to add content, and I want actions in C to invoke changes in its grandparent, A. Currently I am working around this by passing around a self pointer to my base view controller (C.delegate = B.delegate), but it doesn't seem very proper to me. Any thoughts? (and/or general advice on code organization when all sort of subviews needs to talk to superviews would be greatly appreciated) Thanks!

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  • Create an NSManagedObject Without Saving?

    - by Josh Kahane
    I need to make an NSManagedObject without saving it, how can I do this? I have tried insetting one without a context but the app crashes. I have tried the following: GuestInfo *guest; guest = (GuestInfo *)[NSEntityDescription insertNewObjectForEntityForName:@"GuestInfo" inManagedObjectContext:nil]; This causes the crash with the following error message: 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'GuestInfo'' This causes the Hope you can help, thanks.

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  • Filter entire NSDictionaries out of NSArray based on multiple keys

    - by user270475
    Hi, I have an NSArray of NSDictionary objects which I would like to be able to return a new array of NSDictionaries from, where every NSDictionary has "Area == North" (for example). The closest example I have found so far is http://stackoverflow.com/questions/958622/using-nspredicate-to-filter-an-nsarray-based-on-nsdictionary-keys but this just returns the unique values for a given key, not the dictionary that has that key. Is there any way to perform a similar operation, and to return the entire dictionary?

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  • iPhone 4.0 Screen Resolution and writing robust code...

    - by Magic Bullet Dave
    Does anyone know what will happen with existing apps when they run on the iPhone 4.0 in terms of the new screen resolution? I am assuming, just like developing for the iPad that there should be no hard coded screen resolutions in your code. I'd also like advice on the best way of writing robust code to work well on any device. For instance, detecting the screen resolution is not enough - on the iPad the screen is physically bigger so you can display more items on it. On the new iPhone the screen is the same physical size but higher resolution, so the likely thing is that you wont want to display more items, just higher resolution versions of them. Any help would be useful, Regards Dave EDIT: I have read the other similar posts, I guess what I really would like to know is what is the recommended way to write code for all App Store devices in a robust way so they a) all work b) make best use of the device.

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  • How to properly set relationships in Core Data when using setValue and data already exists

    - by ern
    Let's say I have two objects: Articles and Categories. For the sake of this example all relevant categories have already been added to the data store. When looping through data that holds edits for articles, there is category relationship information that needs to be saved. I was planning on using the -setValue method in the Article class in order to set the relationships like so: - (void)setValue:(id)value forUndefinedKey:(NSString *)key { if([key isEqualToString:@"categories"]){ NSLog(@"trying to set categories..."); } } The problem is that value isn't a Category, it is just a string (or array of strings) holding the title of a category. I could certainly do a lookup within this method for each category and assign it, but that seems inefficient when processing a whole bunch of articles at once. Another option is to populate an array of all possible categories and just filter, but my question is where to store that array? Should it be a class method on Article? Is there a way to pass in additional data to the -setValue method? Is there another, better option for setting the relationship I'm not thinking of? Thanks for your help.

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  • How to convert code to properly release memory

    - by BankStrong
    I've taken over a code base that has subtle flaws - audio player goes mute, unlogged crashes, odd behavior, etc. I found a way to provoke one instance of the problem and tracked it to this code snippet: NSURL *soundURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:[[soundsToPlay objectAtIndex:count] description] ofType:@"mp3"]]; self.audioPlayer = nil; self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundURL error:nil]; self.audioPlayer.delegate = self; AudioSessionSetActive(YES); [audioPlayer play]; When I comment out the 2nd line (nil) and add a release to the end, this problem stops. [self.audioPlayer release]; Where do I go from here? Nils are used in a similar fashion throughout the code (and may cause similar problems) - is there a safe way to remove them? I'm new to memory management - how can I discern proper nil usage from bad nil usage?

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  • iPhone OS: Rotate just the button images, not the views

    - by Jongsma
    Hi, I am developing an iPad application which is basically a big drawing canvas with a couple of button at the side. (Doesn't sound very original, does it? :P) No matter how the user holds the device, the canvas should remain in place and should not be rotated. The simplest way to achieve this would be to support just one orientation. However, I would like the images on the buttons to rotate (like in the iPhone camera app) when the device is rotated. UIPopoverControllers should also use the users current orientation (and not appear sideways). What is the best way to achieve this? (I figured I could rotate the canvas back into place with an affineTransform, but I don't think it is ideal.) Thanks in advance!

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  • Custom UISlider Image not responding?

    - by Silent
    Hello all i have a custom image to replace the UISLider defult button image, all works fine image shows, it does not clip off. The problem is when i use the slider to move up and down the image dissapears and some how doesnt show up anymore only sometimes. could someone have a fix?

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  • iPhone: App crashes when I click on a cell in table view.

    - by Jack Griffiths
    Hi there, Compiling my application works—everything is fine. The only errors I get are by deprecated functions (setText). The only problem is now, is that when I tap on a cell in my table, the app crashes, even though it's meant to push to the next view in the stack. Any solutions are appreciated, if you need any code, just ask. Also, how can I only make sure that one cell goes to only one view? For example: When I tap on CSS, it takes me to a new table with different levels of CSS. WHen I tap on an item in that new view, it comes up with an article on what I just selected. Regards, Jack

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  • how can i access a value on a cell in tableview from different class?

    - by ahmet732
    I can hold the value of touched cell but I cannot pass that value to another class or call from that class. SearchTableViewController.m **deneme= [[NSMutableArray alloc]init]; deneme=[tableData objectAtIndex:indexPath.row]; NSLog(@"my row = %@", deneme); //I can hold one of the selected or touched rows in table HistoryTableViewController.m **SearchTableViewController *obj = (SearchTableViewController *)[self.tabBarController.viewControllers objectAtIndex:11]; NSLog(@"my 2nd row= %@", [obj deneme]); //It doesn't retrieve here

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  • How to position a UIToolbar at the top of the screen?

    - by Mr_Nizzle
    I've figured out how to hide the navigation bar and then show the toolbar it has built-in but the toolbar appears at the bottom os the screen how can i position the toolbar on the top of the scren? here's some of my code UIBarButtonItem *yesterday = [[UIBarButtonItem alloc]initWithTitle:@"Yesterday" style:UIBarButtonItemStyleBordered target:self action:@selector(yesterday:)]; UIBarButtonItem *today = [[UIBarButtonItem alloc]initWithTitle:@"Today" style:UIBarButtonItemStyleDone target:self action:@selector(today:)]; UIBarButtonItem *tomorrow = [[UIBarButtonItem alloc]initWithTitle:@"Tomorrow" style:UIBarButtonItemStyleBordered target:self action:@selector(tomorrow:)]; UIBarButtonItem *month = [[UIBarButtonItem alloc]initWithTitle:@"Month" style:UIBarButtonItemStyleBordered target:self action:@selector(month:)]; NSArray *items = [NSArray arrayWithObjects:yesterday,today,tomorrow,month, nil]; [yesterday release]; [today release]; [tomorrow release]; [month release]; [self setToolbarItems:items]; [[self navigationController] setNavigationBarHidden:YES animated:NO]; [[self navigationController] setToolbarHidden:NO animated:YES]; Thanks.

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  • Initializing Detail View from nib with parameters passed from Root View

    - by culov
    I'm have a map view with a number of annotations on it... once the callout is clicked, i need to pass several parameters to the DetailViewController, so ive been trying to do this through the constructor. I've debugged a bit and discovered that the arguments are being passed properly and are being received as expected within the constructor, but for some reason whenever I try to change the values of the IBOutlets I've positioned in the nib, it never has an effect. Here's what im passing (btw, im getting a "No initWithNibName : bundle : header' method found" warning at this line): DetailViewController *dvc = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil header:headerText]; [self.navigationController pushViewController:dvc animated:YES]; Now heres my constructor: - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil header:(UILabel*)headerLabel { if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) { self.headerTextView = headerLabel; NSLog(@"header:%@", headerLabel.text); } return self; } Once again, the problem is that headerLabel.text is printed properly in the console, but the line self.headerTextView = headerLabel; doesnt seem to be doing what I want it to do. Thanks!

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  • Concatenating NSString inside of UITextView

    - by Jason
    I'm some trouble adding strings together for a UITextView in my app. The method I've been using is this (header) #import <UIKit/UIKit.h> @interface calculatorViewController : UIViewController { IBOutlet UITextView *output; } -(IBAction)b1; @property(nonatomic, copy) NSString *output; @end (main) #import "calculatorViewController.h" @implementation calculatorViewController -(void)b1 { [output stringByAppendingString:@"hi"]; } The problem I've been having with this method is when I use the button the app crashes. The warning it gives me is 'UITextView' may not respond to '-stringByAppendingString:' When I replace output with at string it works though and that confused me. Any suggestions? Am I doing something wrong? Thanks

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