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  • Will iPhone OS4 make your life easier or harder as a lone app developer?

    - by Matt
    I am interested to hear what people feel about the new iPhone OS4 release. It is obviously very exciting having access to all the new features, apparently (from apple.com) it has over 1500 new APIs. My original thoughts were "Wow, this is awesome", and I suppose it is. I was just getting comfortable with OS 3.2 development though, and now there is a raft of additional stuff to learn in order to keep up with the pack. So I am feeling quite frustrated! Do you think, when working as an individual app developer, having access to these additional features would improve your applications or just water down the quality? I guess being giving the opportunity to improve applications and provide better features should be welcomed. I think frustration comes from struggling to keep up with the continuous changes, but thats the industry we are in I suppose! Any thoughts/comments?

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  • Touch draw in Quatz 2D/Core Graphics

    - by OgreSwamp
    Hello, I'm trying to implement "hand draw tool". At the moment algorythm looks like that (I don't insert any code because methods are quite big, will try to explain an idea): Drawing In touchesStarted: method I create NSMutableArray *pointsArray and add point into it. Call setNeedsDisplay: method. In touchesMoved: method I calculate points between last added point from the pointsArray and current point. Add all points to the pointsArray. Call setNeedsDisplay: method. In touchesFinished: event I calculate points between last added point from the array and current point. Set flag touchesWereFinished. Call setNeedsDisplay:. Render: drawRect: method checks is pointsArray != nil and is there any data in it. If there is - it starts to traw circles in each point of this array. If flag touchesWereFinished is set - save current context to the UIImage, release pointsArray, set it to nil and reset the flag. There are a lot disadvantages of this method: It is slow It becomes extremely slow when user touches and move finger for long time. Array becomes enormous "Lines" composed by circles are ugly I would like to change my algorithm to make it bit faster and line smoother. In result I would like to have lines like on the picture at following URL (sorry, not enough reputation to insert an image): http://2.bp.blogspot.com/_r5VzEAUYXJ4/SrOYp8tJCPI/AAAAAAAAAMw/ZwDKXiHlhV0/s320/SketchBook+Mobile(4).png Can you advice me, ho I can draw lines this way (smooth and slim on the edges)? I thought to draw circles with alpha gradient on the edges (to make lines smoother), but it will be extremely slowly IMHO. Thanks for help

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  • NSManagedObjectContext returns YES for hasChanges when there are none

    - by JK
    I created a separate NSManagedObjectContext on a separate thread to perform some store maintenance. However, I have noticed that the context returns YES for hasChanges as soon as a managed object in it is even referenced e.g. NSString *name = managedObject.name; This context is created and used exclusively in 1 method. Why is it returning has changes, when there there are none?

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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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  • I need help to debug my XML parsing please

    - by Griffo
    I'm parsing this line: <type>branch</type> with this code if ([elementName isEqualToString:@"type"]) { [currentBranchDictionary setValue:currentText forKey:currentElementName]; } When I test the value in the type key, it does not contain branch but instead it contains branch\n. Here is the test I'm performing: if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch"]) { NSLog(@"no new-line"); } else if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch\n"]) { NSLog(@"new-line"); } this returns the "new-line" output I don't understand where the carriage return is being added, can anyone help?

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  • How do I bind to a custom view in Cocoa using Xcode 4?

    - by Newt
    I'm a beginner when it comes to writing Mac apps and working with Cocoa, so please forgive my ignorance. I'm looking to create a custom view, that exposes some properties, which I can then bind to an NSObjectController. Since it's a custom view, the Bindings Inspector obviously doesn't list any of the properties I've added to the view that I can then bind to using Interface Builder. After turning to the Stackoverflow/Google for help, I've stumbled across a couple of possible solutions, but neither seem to be quite right for my situation. The first suggested creating an IBPlugin, which would then mean my bindings would be available in the Bindings Inspector. I could then bind the view to the controller using IB. Apparently IBPlugins aren't supported in Xcode 4, so that one's out the window. I'm also assuming (maybe wrongly) that IBPlugins are no longer supported because there's a better way of doing such things these days? The second option was to bind the controller to the view programmatically. I'm a bit confused as to exactly how I would achieve this. Would it require subclassing NSObjectController so I can add the calls to bind to the view? Would I need to add anything to the view to support this? Some examples I've seen say you'd need to override the bind method, and others say you don't. Also, I've noticed that some example custom views call [self exposeBinding:@"bindingName"] in the initializer. From what I gather from various sources, this is something that's related to IBPlugins and isn't something I need to do if I'm not using them. Is that correct? I've found a post on Stackoverflow here which seems to discuss something very similar to my problem, but there wasn't any clear winner as to the best answer. The last comment by noa on 12th Sept seems interesting, although they mention you should be calling exposeBinding:. Is this comment along the right track? Is the call to exposeBinding really necessary? Apologies for any dumb questions. Any help greatly appreciated.

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  • How to make a macro which gives back a string into the source code?

    - by mystify
    Example: I want to do this: METHODNAME(5) { // do something } which results in: - (void)animationStep5 { // do something } Is there any way to do this? Basically, what I need is a way to generate a real source code string before the program is compiled, so the compiler does see - (void)animationStep5... Or maybe there's something different than a macro, which can help here to auto-generate method names (not at run-time)?

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  • What is wrong with this code?

    - by Horatiu Paraschiv
    @protocol MyViewDelegate <NSObject> - (void) didFinishProcessing:(MyView*)myView; //compiler stops here with error @end @interface MyView : MySuperclass { id<MyViewDelegate> _delegate; } @property (nonatomic, retain) id<MyViewDelegate> delegate; @end When I try to compile I get " expected ')' before MyView ". Where is the error?

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  • MapView EXC_BAD_ACCESS (SIGSEGV) and KERN_INVALID_ADDRESS

    - by user768113
    I'm having some 'issues' with my application... well, it crashes in an UIViewController that is presented modally, there the user enters information through UITextFields and his location is tracked by a MapView. Lets call this view controller "MapViewController" When the user submits the form, I call a different ViewController - modally again - that processes this info and a third one answers accordingly, then go back to a MenuVC using unwinding segues, which then calls MapViewController and so on. This sequence is repeated many times, but it always crashes in MapViewController. Looking at the crash log, I think that the MapView can be the problem of this or some element in the UI (because of the UIKit framework). I tried to use NSZombie in order to track a memory issue but it doesn't give me a clue about whats happening. Here is the crash log Hardware Model: iPad3,4 Process: MyApp [2253] OS Version: iOS 6.1.3 (10B329) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000044 Crashed Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 IMGSGX554GLDriver 0x328b9be0 0x328ac000 + 56288 1 IMGSGX554GLDriver 0x328b9b8e 0x328ac000 + 56206deallocated instance 2 IMGSGX554GLDriver 0x328bc2f2 0x328ac000 + 66290 3 IMGSGX554GLDriver 0x328baf44 0x328ac000 + 61252 4 libGPUSupportMercury.dylib 0x370f86be 0x370f6000 + 9918 5 GLEngine 0x34ce8bd2 0x34c4f000 + 629714 6 GLEngine 0x34cea30e 0x34c4f000 + 635662 7 GLEngine 0x34c8498e 0x34c4f000 + 219534 8 GLEngine 0x34c81394 0x34c4f000 + 205716 9 VectorKit 0x3957f4de 0x394c7000 + 754910 10 VectorKit 0x3955552e 0x394c7000 + 582958 11 VectorKit 0x394d056e 0x394c7000 + 38254 12 VectorKit 0x394d0416 0x394c7000 + 37910 13 VectorKit 0x394cb7ca 0x394c7000 + 18378 14 VectorKit 0x394c9804 0x394c7000 + 10244 15 VectorKit 0x394c86a2 0x394c7000 + 5794 16 QuartzCore 0x354a07a4 0x35466000 + 239524 17 QuartzCore 0x354a06fc 0x35466000 + 239356 18 IOMobileFramebuffer 0x376f8fd4 0x376f4000 + 20436 19 IOKit 0x344935aa 0x34490000 + 13738 20 CoreFoundation 0x33875888 0x337e9000 + 575624 21 CoreFoundation 0x338803e4 0x337e9000 + 619492 22 CoreFoundation 0x33880386 0x337e9000 + 619398 23 CoreFoundation 0x3387f20a 0x337e9000 + 614922 24 CoreFoundation 0x337f2238 0x337e9000 + 37432 25 CoreFoundation 0x337f20c4 0x337e9000 + 37060 26 GraphicsServices 0x373ad336 0x373a8000 + 21302 27 UIKit 0x3570e2b4 0x356b7000 + 357044 28 MyApp 0x000ea12e 0xe9000 + 4398 29 MyApp 0x000ea0e4 0xe9000 + 4324 I think thats all, additionally, I would like to ask you: if you are using unwind segues then you are releasing view controllers from the memory heap, right? Meanwhile, performing segues let you instantiate those controllers. Technically, MenuVC should be the only VC alive in the heap during the app life cycle if you understand me.

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  • Custom setter methods in Core-Data

    - by andrewebling
    I need to write a custom setter method for a field (we'll call it foo) in my subclass of NSManagedObject. foo is defined in the data model and Xcode has autogenerated @property and @dynamic fields in the .h and .m files respectively. If I write my setter like this: - (void)setFoo: (NSObject *)inFoo { [super setFoo: inFoo]; [self updateStuff]; } then I get a compiler warning on the call to super. Alternatively, if I do this: - (void)setFoo: (NSObject *)inFoo { [super setValue: inFoo forKey: inFoo]; [self updateStuff]; } then I end up in an infinite loop. So what's the correct approach to write a custom setter for a subclass of NSManagedObject?

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  • Is it possible to invoke NSDictionary's valueForKeyPath: when a key contains periods?

    - by Jonukas
    I'm trying to get the value of the repeatInterval key in the com.apple.scheduler plist. I'd like to just use NSDictionary's valueForKeyPath: method like so: CFPropertyListRef value; value = CFPreferencesCopyValue(CFSTR("AbsoluteSchedule"), CFSTR("com.apple.scheduler"), kCFPreferencesCurrentUser, kCFPreferencesCurrentHost); NSNumber *repeatInterval = [(NSDictionary *)value valueForKeyPath:@"com.apple.SoftwareUpdate.SUCheckSchedulerTag.Timer.repeatInterval"]; But the problem with this is that the first key is really "com.apple.SoftwareUpdate", not just "com". I can get around this by getting that first value separately: NSDictionary *dict = [(NSDictionary *)value valueForKey:@"com.apple.SoftwareUpdate"]; NSNumber *repeatInterval = [dict valueForKeyPath:@"SUCheckSchedulerTag.Timer.repeatInterval"]; I just wanted to know if there is a way to escape periods in a keypath so I can eliminate this extra step.

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  • UITableView not getting populated with sqlite database column

    - by Ingila Ejaz
    Here's the code of a method I used to populate UITableView with the contents of a column in sqlite database. However, this is giving no errors at run-time but still does not give any data in UITableView. If anyone could help, it'll be highly appreciated. - (void)viewDidLoad{ [super viewDidLoad]; self.title = @"Strings List"; UITableViewCell *cell; NSString *docsDir; NSArray *dirPaths; sqlite3_stmt *statement; // Get the documents directory dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); docsDir = [dirPaths objectAtIndex:0]; // Build the path to the database file databasePath = [[NSString alloc]initWithString: [docsDir stringByAppendingPathComponent:@"strings.sqlite"]]; NSFileManager *filemgr = [NSFileManager defaultManager]; if ([filemgr fileExistsAtPath: databasePath ] == NO) { const char *dbpath = [databasePath UTF8String]; if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK) { NSString * query = @"SELECT string FROM strings"; const char * stmt = [query UTF8String]; if (sqlite3_prepare_v2(contactDB, stmt, -1,&statement, NULL)==SQLITE_OK){ if (sqlite3_step(statement) == SQLITE_ROW) { NSString *string = [[NSString alloc]initWithUTF8String:(const char*)sqlite3_column_text(statement, 0)]; cell.textLabel.text = string; } } else NSLog(@"Failed"); sqlite3_finalize(statement); } sqlite3_close(contactDB); } }

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  • noob iPhone "count" frustrations!?!?!

    - by codemonkey
    Okay, I know I must be doing something incredibly stupid here. Here's the sample code (which, when executed within a viewDidLoad block silently crashes... no error output to debug console). NSMutableArray *bs = [NSMutableArray arrayWithCapacity:10]; [bs addObject:[NSNumber numberWithInteger: 2]]; NSLog(@"%@", [bs count]); [bs release]; What am I missing? Oh... and in case anyone is wondering, this code is just me trying to figure out why I can't get the count of an NSMutableArray that actually matters somewhere else in the program.

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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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  • UIVIewController not released when view is dismissed

    - by Nelson Ko
    I have a main view, mainWindow, which presents a couple of buttons. Both buttons create a new UIViewController (mapViewController), but one will start a game and the other will resume it. Both buttons are linked via StoryBoard to the same View. They are segued to modal views as I'm not using the NavigationController. So in a typical game, if a person starts a game, but then goes back to the main menu, he triggers: [self dismissViewControllerAnimated:YES completion:nil ]; to return to the main menu. I would assume the view controller is released at this point. The user resumes the game with the second button by opening another instance of mapViewController. What is happening, tho, is some touch events will trigger methods on the original instance (and write status updates to them - therefore invisible to the current view). When I put a breakpoint in the mapViewController code, I can see the instance will be one or the other (one of which should be released). I have tried putting a delegate to the mainWindow clearing the view: [self.delegate clearMapView]; where in the mainWindow - (void) clearMapView{ gameWindow = nil; } I have also tried self.view=nil; in the mapViewController. The mapViewController code contains MVC code, where the model is static. I wonder if this may prevent ARC from releasing the view. The model.m contains: static CanShieldModel *sharedInstance; + (CanShieldModel *) sharedModel { @synchronized(self) { if (!sharedInstance) sharedInstance = [[CanShieldModel alloc] init]; return sharedInstance; } return sharedInstance; } Another post which may have a lead, but so far not successful, is UIViewController not being released when popped I have in ViewDidLoad: // checks to see if app goes inactive - saves. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(resignActive) name:UIApplicationWillResignActiveNotification object:nil]; with the corresponding in ViewDidUnload: [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil]; Does anyone have any suggestions? EDIT: - (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{ NSString *identifier = segue.identifier; if ([identifier isEqualToString: @"Start Game"]){ gameWindow = (ViewController *)[segue destinationViewController]; gameWindow.newgame=-1; gameWindow.delegate = self; } else if ([identifier isEqualToString: @"Resume Game"]){ gameWindow = (ViewController *)[segue destinationViewController]; gameWindow.newgame=0; gameWindow.delegate = self;

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  • NSOperationqueue i want to block main thread

    - by alexeyndru
    i want to block the main thread until something else is done in the background. i used: result=[self performSelectorInBackground:@selector(calculate:) withObject:expression]; just bellow this line I am using result: [self use:result]; i dont want to use result until it is available. to achieve this I implemented calculate: { [[(AppDelegate *)[[UIApplication sharedApplication] delegate] queue] waitUntilAllOperationsAreFinished]; calculating result... } and still, the result is used before it is calculated. so, i didnt block the main thread. pls help me do that. thanks

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  • How to specify the left, right, or title View button in XIB

    - by Sharen Eayrs
    I do not want to create a custom navigation bar. I am pushing a UIViewController and I want to customize how the navigation bar looks for that UIViewController In story board, we just specify the segue and a nav bar show up on the screen. We just drag and drop UIBarItem to the left and right. In XIB, the navigationBar simply doesn't show up. I can add navigation Item but the one I added is ignored. I've heard that there used to be an outlet called navigationItem but it's deprecated for reason I do not know. I can add UINavigationBar, however that would be adding my own custom bar. I want the navBar that's provided by UINavigationController.

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  • iPhone: Cocos2d how to make a sequence

    - by Johannes Jensen
    I have two logos, which I want to come in after each other. I'd like to use CCFadeIn and CCFadeOut. I have Logo1, and then I want it to CCFadeIn, then I want it to stay for 2 seconds, then make it fade out using CCFadeOut, and then make Logo2 CCFadeIn for 1 second, stay for 2 seconds and then go away during 1 second with CCFadeOut. How I would make this I'm not completely sure. I can't seem to find a way to make a CCAction fire a method (let's say -finishedFadingInLogo1:), so I don't know how to do this. Any ideas?

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  • Custom nib UITableViewCell height

    - by Chuck
    I've created a custom UITableViewCell in IB, linked it to the root view controller's property for it, and set it up in CellForRowAtIndexPath. But the height of my drawn cells doesn't match what I setup in IB, advice? Here's some screenshots and the code. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *AddressCellIdentifier = @"AddressCellIdent"; UITableViewCell *thisCell = [tableView dequeueReusableCellWithIdentifier:AddressCellIdentifier]; if (thisCell == nil) { [[NSBundle mainBundle] loadNibNamed:@"AddressCell" owner:self options:nil]; thisCell = addressCell; self.addressCell = nil; } return thisCell ; } addressCell is a @property (nonatomic, assign) IBOutlet UITableViewCell *addressCell;, and is linked up in IB to the file's owner (the table view controller). I'm using the example from Apple's table view programming guide.

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  • ApplicationDelegate is not doing its own job here ! Can anyone help me??

    - by ahmet732
    (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { MaSystemGuiAppDelegate *appDelegate = (MaSystemGuiAppDelegate *)[[UIApplication sharedApplication] delegate]; appDelegate.deneme = [tableData objectAtIndex:indexPath.row] ; NSLog(@"my row", appDelegate.deneme); // THIS IS NOT PRINTING NSLog(@"my row = %@", [tableData objectAtIndex:indexPath.row]); //THIS IS PRINTING THE VALUE ON CONSOLE NSInteger row = [indexPath row]; if(self.searchDetailViewController == nil){ SearchDetailViewController *asearchDetail = [[SearchDetailViewController alloc] initWithNibName:@"SearchDetailView" bundle:nil]; self.searchDetailViewController = asearchDetail; [asearchDetail release]; } searchDetailViewController.title = [NSString stringWithFormat:@"%@", [searchArray objectAtIndex:row]]; MaSystemGuiAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; [delegate.searchNavController pushViewController:searchDetailViewController animated:YES]; } "deneme" is a NMUtableArray is identified in MaSystemGuiAppDelegate.h (I identified it as a variable and put its property there) and I wrote "deneme= [[NSMutableArray alloc]init]; in applicationDidFinishLaunching method in MaSystemGuiAppDelegate.m. In the code above, [tableData objectAtIndex:indexPath.row] is retrieving the one of the value touched on tableview. When I put that value in deneme (as u noticed in the code) it is printing nothing. What am i missing? (I imported MaSystemGuiAppDelegate.h)

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