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  • Core Data object into an NSDictionary with possible nil objects

    - by Chuck
    I have a core data object that has a bunch of optional values. I'm pushing a table view controller and passing it a reference to the object so I can display its contents in a table view. Because I want the table view displayed a specific way, I am storing the values from the core data object into an array of dictionaries then using the array to populate the table view. This works great, and I got editing and saving working properly. (i'm not using a fetched results controller because I don't have anything to sort on) The issue with my current code is that if one of the items in the object is missing, then I end up trying to put nil into the dictionary, which won't work. I'm looking for a clean way to handle this, I could do the following, but I can't help but feeling like there's a better way. *passedEntry is the core data object handed to the view controller when it is pushed, lets say it contains firstName, lastName, and age, all optional. if ([passedEntry firstName] != nil) { [dictionary setObject:[passedEntry firstName] forKey:@"firstName"] } else { [dictionary setObject:@"" forKey:@"firstName"] } And so on. This works, but it feels kludgy, especially if I end up adding more items to the core data object down the road.

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  • How to search on a array and display the items on tableview using a searchbar?

    - by skiria
    Hi, I would like to search on a arrays hierachy and display the results on a tableview. The tableview is empty when we run the app and the, when we search it, the data is written. What's the best way to do this? I read tutorials wich explains how it search on a tableview, but i want to search in all of arrays hierachy. I have 3 classes class video //iVars to allocate the video metadata NSInteger videoID; NSString *nameVideo; NSString *nameCategory; NSString *nameTopic; NSString *user; NSString *date; NSString *description; NSString *urlThumbnail; NSString *urlVideo; class Topic NSInteger TopicId; NSString nameTopic; NSMutableArray videos; class Category NSInteger CategoryId; NSString nameCategory NSMutableArray topics AppDelegate NSMutableArray categories

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  • How to calculate the touch location with convertToWorldSpace?

    - by Paul
    i would like to convert the touch location as a world coordinate in my tile game. With this code, i clicked on the right of the screen (so that my character walks in the tiled game, and the background goes slowly to the left) : - (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { for( UITouch *touch in touches ) { CGPoint location = [touch locationInView: [touch view]]; location = [[CCDirector sharedDirector] convertToGL: location]; CGPoint test = [self convertToWorldSpace:location]; CCLOG(@"test : %.2g", test.x); The test log gives me : 50, 72, 1e+02, 2.6e+02, 4.2e+02, (and then goes down) 3.2e+02, 9.5, -1.9e+02, etc. Does anyone know why? I would like to calculate the "real" coordinate of the touch, so that i know when the character has to keep going (click on the right of its actual position) or if he has to turn and go backwards. (click on the left of its actual position) Thanks for your help

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  • pointer being freed was not allocated

    - by kudorgyozo
    Hello i have the following error: malloc: * error for object 0x2087000: pointer being freed was not allocated * set a breakpoint in malloc_error_break to debug I have no idea what object that is. I don't know how to find it. Can anybody explain to me how (and where) to use malloc_history. I have set a breakpoint in malloc_error_break but i couldn't find out what object is at that address. I receive this after removing an object from an nsmutablearray and popping a view controller manually. If I comment out the line [reviewUpload.images removeObject: self.reviewUploadImg] it doesn't give me the error but of course it's not useful for me like that. - (void) removeImage { debugLog(@"reviewUploadImg %@", self.reviewUploadImg); debugLog(@"reviewUpload %@", self.reviewUpload); debugLog(@"reviewUploadImg thumb %@", self.reviewUploadImg.thumb); [reviewUpload.images removeObject: self.reviewUploadImg]; [self.navigationController popViewControllerAnimated:TRUE]; }

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  • Why manual memory management?

    - by user333639
    Are there any plans for auto memory management? What are the advantanges of manually managing memory...does it conserve memory in the long run? I have noticed in .Net Windows Applications - they are very sluggish - is this partly due to the garbage collector not working correctly?

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  • Performselector not call in NSThread

    - by abdulsamad
    Hi all, I have a problem that i want to call a function when one of my functions that is running into a seperate thread comes to an end. its like that [NSThread detachNewThreadSelector:@selector(fetchFeaturedFreeApps) toTarget:self withObject:nil]; here is my fetchFeaturedFreeApps function -(void)fetchFeaturedFreeApps { ////all my code [self performSelector:@selector(closeView) withObject:nil afterDelay:4.0]; } My problem is that the close view methods doesnt run after the 4 seconds. Hoew if i call the fetchFeaturedFreeApps method with perform selector then my closeview metod is called properly. Your valuable help is highly appreciated.

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  • UItableView Reload Problem

    - by Arun Sharma
    Hello All, I am using a UiTableView in our application.We have two tabs in controller one is add to shopping list where i add more than one items in our shopping list in database,other one is shopping list which shows items for shopping. The problem is that when i add items from shopping list tab then items are successfully added in database but when i click on shopping list tab then any items not shown in shopping list. How i reload data in UiTableView when i click on shopping list tab.

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  • how to reloadData in tableView when tableview access data from database.

    - by Ajeet Kumar Yadav
    I am new in iphone i am developing a application that take value from data base and display data in tableview. in this application we save data from one data table to other data table this is when add first time work and when we do second time application is crash. how to solve this problem i am not understand code is given bellow my appdelegate code for insert value from one table to other is given bellow -(void)sopinglist { //////databaseName= @"SanjeevKapoor.sqlite"; databaseName =@"AjeetTest.sqlite"; NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDir = [documentPaths objectAtIndex:0]; databasePath =[documentsDir stringByAppendingPathComponent:databaseName]; [self checkAndCreateDatabase]; list1 = [[NSMutableArray alloc] init]; sqlite3 *database; if (sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { if(addStmt == nil) { ///////////const char *sql = "insert into Dataa(item) Values(?)"; const char *sql = " insert into Slist select * from alootikki"; ///////////// const char *sql =" Update Slist ( Incredients, Recipename,foodtype) Values(?,?,?)"; if(sqlite3_prepare_v2(database, sql, -1, &addStmt, NULL) != SQLITE_OK) NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3_errmsg(database)); } /////for( NSString * j in k) sqlite3_bind_text(addStmt, 1, [k UTF8String], -1, SQLITE_TRANSIENT); //sqlite3_bind_int(addStmt,1,i); // sqlite3_bind_text(addStmt, 1, [coffeeName UTF8String], -1, SQLITE_TRANSIENT); // sqlite3_bind_double(addStmt, 2, [price doubleValue]); if(SQLITE_DONE != sqlite3_step(addStmt)) NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(database)); else //SQLite provides a method to get the last primary key inserted by using sqlite3_last_insert_rowid coffeeID = sqlite3_last_insert_rowid(database); //Reset the add statement. sqlite3_reset(addStmt); // sqlite3_clear_bindings(detailStmt); //} } sqlite3_finalize(addStmt); addStmt = nil; sqlite3_close(database); } And the table View code for access data from database is given bellow SanjeevKapoorAppDelegate *appDelegate =(SanjeevKapoorAppDelegate *)[[UIApplication sharedApplication] delegate]; [appDelegate sopinglist]; ////[appDelegate recpies]; /// NSArray *a =[[appDelegate list1] componentsJoinedByString:@","]; k= [[appDelegate list1] componentsJoinedByString:@","];

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  • Recording custom overlay on iPhone

    - by Marc
    Hi all, I'm interested in recording a video with a custom overlay which would end up in the video itself. They could be UIImage or even better, an OpenGL viewport, is there even such possibility right now on any iPhone devices/SDK ? Thanks

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  • GameKit server disconnect makes session invalid

    - by Markus
    Hi everyone, I'm trying to build a 4 player multiplayer game using GameKit. I tried many things and I'm currently using client/server mode, meaning that I have 1 session in GKSessionModeServer and 3 other sessions connecting to this one in GKSessionModeClient. My goal is, that when a user leaves the game or gets disconnected for whatever reason, that the others can continue their game. So far this works if any of the Clients leave the game, but if the Sevrer leaves the game, send and receive calls are not reaching the other peers anymore. I tried the same with 4 peers in GKSessionModePeer with the same result (where the player who accepts connections cannot quit). Does anyone had better success in making this work? Any help is highly appreciated. Thanks!

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  • Trying to trigger php script, get EXC_BAD_ACCESS iPhone development

    - by Brennan Kastner
    This below is my code, when it gets to the end of the function, the debugger throws an EXC_BAD_ACCESS error and when I check the website's logs, the url was never visited. If anyone could help me fix this issue, it would be greatly appreciated: -(IBAction)submitEmail:(id)sender { NSString *urlStringRaw = [[NSString alloc] init]; urlStringRaw = [NSString stringWithFormat:@"http://vedev.org/AnonMail/sendEmail.php?from=%@&to=%@&subject=%@&body=%@", from.text, to.text, subject.text, bodyContent.text]; NSString *urlString = [urlStringRaw stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; [urlStringRaw release]; NSURL * url = [NSURL URLWithString:urlString]; [urlString release]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; [url release]; NSURLConnection *connection = [NSURLConnection connectionWithRequest:requestObj delegate:nil]; [connection release]; [requestObj release]; }

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  • Can`t draw in CAlayer.

    - by Ann
    HI All. I have subclass of UIScrollView. IN this class I have added some imageView.layer to self.layer. And when I call [imageView.layer setNeedsDisplay] my implemented delegate never called. -(void)drawLayer:(CALayer*)layer :(CGContextRef)context I`ve also set imageView.layer.delegate = self Could anyone tell me where I must set delegate function to make this to work. Thank you for advance.

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  • Get highlighted state for NSButtonCell

    - by dvg
    I have a NSTableView that contains a NSButtonCell in one of the columns. To draw a custom background in neighbor cells (based on NSTextFieldCell) I use isHighlighted method: - (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView { if ([self isHighlighted]) { //here I draw the cell background But for NSButtonCell isHighlighted shows only the button pressed state. How to determine when the NSButtonCell is selected, i.e. when it's highlighted in the row?

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  • Adding a searchbar to display array items on a tableview?

    - by skiria
    I want to build an app that shows a empty tableview. Then users can write a text on a searchbar and when they click on Search button the tableview will be written with array items founded. I've see this tutorial: link text, but I only need to search when user click SearchButton. How can I do this? What methods do i have to use? I've tried with this method, but it doesn't works. - (void) searchBarSearchButtonClicked:(UISearchBar *)theSearchBar { NSInteger nVideos = [appDelegate.allVideos count]; NSLog(@"number of videos: %i", nVideos);

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  • CGAffineTransformMakeRotation goes the other way after 180 degrees (-3.14)

    - by TheKillerDev
    So, i am trying to do a very simple disc rotation (2d), according to the user touch on it, just like a DJ or something. It is working, but there is a problem, after certain amount of rotation, it starts going backwards, this amount is after 180 degrees or as i saw in while logging the angle, -3.14 (pi). I was wondering, how can i achieve a infinite loop, i mean, the user can keep rotating and rotating to any side, just sliding his finger? Also a second question is, is there any way to speed up the rotation? Here is my code right now: #import <UIKit/UIKit.h> @interface Draggable : UIImageView { CGPoint firstLoc; UILabel * fred; double angle; } @property (assign) CGPoint firstLoc; @property (retain) UILabel * fred; @end @implementation Draggable @synthesize fred, firstLoc; - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; angle = 0; if (self) { // Initialization code } return self; } -(void)handleObject:(NSSet *)touches withEvent:(UIEvent *)event isLast:(BOOL)lst { UITouch *touch =[[[event allTouches] allObjects] lastObject]; CGPoint curLoc = [touch locationInView:self]; float fromAngle = atan2( firstLoc.y-self.center.y, firstLoc.x-self.center.x ); float toAngle = atan2( curLoc.y-(self.center.y+10), curLoc.x-(self.center.x+10)); float newAngle = angle + (toAngle - fromAngle); NSLog(@"%f",newAngle); CGAffineTransform cgaRotate = CGAffineTransformMakeRotation(newAngle); self.transform = cgaRotate; if (lst) angle = newAngle; } -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch =[[[event allTouches] allObjects] lastObject]; firstLoc = [touch locationInView:self]; }; -(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { [self handleObject:touches withEvent:event isLast:NO]; }; -(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { [self handleObject:touches withEvent:event isLast:YES]; } @end And in the ViewController: UIImage *tmpImage = [UIImage imageNamed:@"theDisc.png"]; CGRect cellRectangle; cellRectangle = CGRectMake(-1,self.view.frame.size.height,tmpImage.size.width ,tmpImage.size.height ); dragger = [[Draggable alloc] initWithFrame:cellRectangle]; [dragger setImage:tmpImage]; [dragger setUserInteractionEnabled:YES]; dragger.layer.anchorPoint = CGPointMake(.5,.5); [self.view addSubview:dragger]; I am open to new/cleaner/more correct ways of doing this too. Thanks in advance.

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  • How can I display the camera view in the main window in real time?

    - by Mongrel Warfare
    I'm trying to make an augmented reality application with a waypoint structure, like Yelp, and I'm wondering how to set up my main view so that it displays the camera view on the whole screen. I've heard of using the UIImagePickerController Class, but I'm unsure how to manipulate the code so that it doesn't actually take a picture, but just stays in the view mode. Any help would be appreciated, thanks!

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  • How to assign a value to an pointer-pointer passed in call by reference?

    - by mystify
    I want to achieve something similar to what these guys do here: - (NSUInteger)countForFetchRequest:(NSFetchRequest *)request error:(NSError **)error like you can see, you pass an NSError pointer and that nice method will assign a real NSError object to your pointer in case there is an error. So the cool thing about this is, that the method returns an NSUInteger but can ALSO return an NSError, without having to mess around with ugly and fat arrays or dictionaries. So how could I assign an object to the passed-in error pointer?

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  • @selector and return value

    - by user320926
    The idea it's very easy, i have an http download class, this class must support the http authentication but it's basically a background thread so i would like to avoid to prompt directly to the screen, i would like to use a delegate method to require from outside of the class, like a viewController. But i don't know if is possible or if i have to use a different syntax. This class use this delegate protocol: //Updater.h @protocol Updater <NSObject> -(NSDictionary *)authRequired; @optional -(void)statusUpdate:(NSString *)newStatus; -(void)downloadProgress:(int)percentage; @end @interface Updater : NSThread { ... } This is the call to the delegate method: //Updater.m // This check always fails :( if ([self.delegate respondsToSelector:@selector(authRequired:)]) { auth = [delegate authRequired]; } This is the implementation of the delegate method //rootViewController.m -(NSDictionary *)authRequired; { // TODO: some kind of popup or modal view NSMutableDictionary *ret=[[NSMutableDictionary alloc] init]; [ret setObject:@"utente" forKey:@"user"]; [ret setObject:@"password" forKey:@"pass"]; return ret; }

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  • iPhone animated banner : which framework to use

    - by Julien
    Hi folks, I'm willing to create a little frame to display animated ads in my app. It could be simple little animations, or "3D" transition between ads, or combination of both. I'm not familiar with graphic frameworks, I just used CoreGraphics, which I think is not optimized for that. I thought of OpenGL, but maybe that's too much and takes too much ressources just for this little thing. What do you think ?

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  • Building a NSPredicate for a filter

    - by John
    Hi, Just wondering what the best way to build a NSPredicate is if some filters are optional? This is basically for a filter, so if some options aren't selected I don't to filter by them eg. If I have option1 and option2 set for the filter. NSPredicate* predicate = [NSPredicate predicateWithFormat:@"option1 = %@ AND option2 = %@] .... otherwise if just option1 NSPredicate* predicate = [NSPredicate predicateWithFormat:@"option1 = %@] .... The key being there are 10 different options to filter, so I don't want to have to code for the 10x10 possible combinations. Thanks

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  • Converting RGB values to CMYK

    - by llk
    Hi all, I have RGB values that I need to convert into CMYK values. I'm using the iPhone SDK to try and do this. I have tried a couple of things, but cannot either get the values to be anything other than 0 or 1, or the K element is completely wrong (showing up as a negative number). Any help would be a life saver! Thanks in advance!

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