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  • iPhone Pong Advanced Deflection Angle

    - by CherryBun
    Hi, I am currently developing a simple Pong game for the iPhone. Currently using CGRectIntersectsRect for the collision detection and as for the deflection of the ball when it hits the paddle, I just multiply the ball velocity with -1 (therefore reversing the direction of the ball). What I am trying to do is to make it so that when the ball hits the paddle, it checks whether how far is the ball from the center of the paddle, and increases the deflection angle the further the ball is away from the center of the paddle. (E.g. In this case, the ball will be deflected back at 90 degrees no matter where it came from, as long as it hits the center of the paddle) How am I suppose to do that? Any help would be greatly appreciated. Thank you.

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  • iPhone: error: request for member 'table' in something not a structure or union

    - by Jack Griffiths
    Hi there, When it comes to compiling my application, I get the error mentioned in the title. How would I go about remedying this error? Basically, I want to get from one table to the other. Hierarchy, navigation. NextViewController.m #import "RootViewController.h" #import "NextViewController.h" @implementation NextViewController - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview // Release anything that's not essential, such as cached data } - (void)dealloc { [super dealloc]; } - (IBAction) changeTable:(NSString *)str{ tblCSS.table = str; } The last line contains the error. If you need any more code, just ask. I'll amend this post with it. Cheers, Jack

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  • Exposing headers on iPhone static library

    - by leolobato
    Hello guys, I've followed this tutorial for setting up a static library with common classes from 3 projects we are working on. It's pretty simple, create a new static library project on xcode, add the code there, a change some headers role from project to public. The tutorial says I should add my library folder to the header search paths recursively. Is this the right way to go? I mean, on my library project, I have files separated in folders like Global/, InfoScreen/, Additions/. I was trying to setup one LOKit.h file on the root folder, and inside that file #import everything I need to expose. So on my host project I don't need to add the folder recursively to the header search path, and would just #import "LOKit.h". But I couldn't get this to work, the host project won't build complaining about all the classes I didn't add to LOKit.h, even though the library project builds. So, my question is, what is the right way of exposing header files when I setup a Cocoa Touch Static Library project on xCode?

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  • What do I need to implement a basic map framework?

    - by Mickey Shine
    I am doing iPhone development and what I want is a custom map framework (not route-me, not Google Maps). So far I found CATiledLayer and UISCrollView is helpful. But I am still not clear about the stuff(any kind of view, or anything from CoreAnimation framework, or anything else?) which would be perfectly fit this. I need some guidance of making a custom map framework from scratch. Thank you

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  • Tool for debugging KVO/Bindings in Cocoa

    - by Raphael Sebbe
    Is there any tool to log current observers of a given object, in the spirit of what "gdb info gc-roots" does? I found "gdb info gc-references" could do that (sort of) as a by-product of its original purpose, but that won't work with non garbage collected apps. Thanks!

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  • Why is my UIImageView blurred?

    - by Denis M
    I have a really weird problem with UIImageView. I have an image (an RGB png) 45x45 pixels which I add to the view. I can see that image is blurred after added to the view. Here is the same image in the simulator (left) and in Xcode (right): I have custom UIImageView class with this initWithImage code: - (id) initWithImage:(UIImage*) image { self = [super initWithImage:image]; self.frame = CGRectMake(0, 0, 45, 45); self.contentMode = UIViewContentModeScaleAspectFit; self.quantity = 1; if (self) { self.label = [[UITextField alloc]initWithFrame:CGRectMake(0,40,45,25)]; self.label.font = [UIFont systemFontOfSize:16]; self.label.borderStyle = UITextBorderStyleNone; self.label.enabled = TRUE; self.label.userInteractionEnabled = TRUE; self.label.delegate = self; self.label.keyboardType = UIKeyboardTypeNumbersAndPunctuation; self.label.textAlignment = UITextAlignmentCenter; } self.userInteractionEnabled = TRUE; // Prepare 3 buttons: count up, count down, and delete self.deleteButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; self.deleteButton.hidden = NO; self.deleteButton.userInteractionEnabled = YES; self.deleteButton.titleLabel.font = [UIFont systemFontOfSize:20]; self.deleteButton.titleLabel.textColor = [UIColor redColor]; [self.deleteButton setTitle:@"X" forState:UIControlStateNormal]; [self.deleteButton addTarget:self action:@selector(deleteIcon:) forControlEvents:UIControlEventTouchUpInside]; self.upCountButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; self.upCountButton.hidden = NO; self.upCountButton.userInteractionEnabled = YES; [self.upCountButton setTitle:@"+" forState:UIControlStateNormal]; [self.upCountButton addTarget:self action:@selector(addQuantity:) forControlEvents:UIControlEventTouchUpInside]; self.downCountButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; self.downCountButton.hidden = YES; self.downCountButton.userInteractionEnabled = YES; [self.downCountButton setTitle:@"-" forState:UIControlStateNormal]; [self.downCountButton addTarget:self action:@selector(removeQuantity:) forControlEvents:UIControlEventTouchUpInside]; return self; } I create it like this: UIImage *desertIcon = [UIImage imageNamed:@"desert.png"]; IconObj *desertIconView = [[IconObj alloc] initWithImage:desertIcon]; desertIconView.center = CGPointMake(265,VERTICAL_POINT_ICON); desertIconView.type = [IconObj TYPE_DESERT]; [self.view addSubview:desertIconView]; [desertIconView release]; Why would the displayed image be so than the one stored in a file?

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  • Get objc_exception_throw when setting cookie with ASIHTTPRequest

    - by TuanCM
    I got objc_exception_throw when trying to set cookies for a ASIHTTPRequest request. I tried both of these but it didn't work out. ASIHTTPRequest *request = [[ASIHTTPRequest alloc] initWithURL:url]; NSMutableDictionary *properties = [[NSMutableDictionary alloc] init]; [properties setValue:@".google.com" forKey:@"Domain"]; [properties setValue:@"/" forKey:@"path"]; [properties setValue:@"1600000000" forKey:@"expires"]; NSHTTPCookie *cookie = [[NSHTTPCookie alloc] initWithProperties:properties]; [request setRequestCookies:[NSMutableArray arrayWithObject:cookie]]; or replacing initiating code for cookie with this one NSHTTPCookie *cookie = [[NSHTTPCookie alloc] init]; When I commented out the following line, everything worked fine. [request setRequestCookies:[NSMutableArray arrayWithObject:cookie]]; Can you guys tell me what the problem here!

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  • Problem with TTWebController… alternative view controller template for UIWebView?

    - by prendio2
    I have a UIWebView with content populated from a Last.fm API call. This content contains links, many of which are handled by parsing info from the URL in: - (BOOL)webView:(UIWebView *)aWbView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType; …and passing that info on to appropraite view controllers. When I cannot handle a URL I would like to push a new view controller on the stack and load the webpage into a UIWebView there. The TTWebController in Three20 looks very promising since it has also implemented a navigation toolbar, loading indicators etc. Somewhat naively perhaps I thought I would be able to use this controller to display web content in my app, without implementing Three20 throughout the app. I followed the instructions on github to add Three20 to my project and added the following code to deal with URLs in shouldStartLoadWithRequest: TTWebController* browser = [[TTWebController alloc]init]; [browser openURL:@"http://three20.info"]; //initially test with this URL [self.navigationController pushViewController:navigator animated:YES]; This crashes my app however with the following notice: *** -[TTNavigator setParentViewController:]: unrecognized selector sent to instance 0x3d5db70 What else do I need to do to implement the TTWebController in my app? Or do you know of an alternative view controller template that I can use instead of the Three20 implementation?

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  • Loading 2 Singletons With Dependencies when an app is opened (appDelegate / appDidBecomeActive) iPhone SDK

    - by taber
    I'm trying to load two standard-issue style singletons: http://cocoawithlove.com/2008/11/singletons-appdelegates-and-top-level.html when my iPhone app is loaded. Here's my code: - (void) applicationDidFinishLaunching:(UIApplication *)application { // first, restore user prefs [AppState loadState]; // then, initialize the camera [[CameraModule sharedCameraModule] initCamera]; } My "camera module" has code that checks a property of the AppState singleton. But I think what's happening is a race condition where the camera module singleton is trying to access the AppState property while it's in the middle of being initialized (so the property is nil, and it's re-initializing AppState). I'd really like to keep these separate, instead of just throwing one (or both) into the App Delegate. Has anyone else seen something like this? What kind of workaround did you use, or what would you suggest? Thanks in advance! Here's the loadState method: + (void)loadState { @synchronized([AppState class]) { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *file = [documentsDirectory stringByAppendingPathComponent:@"prefs.archive"]; Boolean saveFileExists = [[NSFileManager defaultManager] fileExistsAtPath:file]; if(saveFileExists) { sharedAppState = [[NSKeyedUnarchiver unarchiveObjectWithFile:file] retain]; } else { [AppState sharedAppState]; } } }

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  • MPMediaickerController memory leak

    - by Joe
    This is code from Apple's Addmusic example. MPMediaPickerController *picker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic]; picker.delegate = self; picker.allowsPickingMultipleItems = YES; picker.prompt = NSLocalizedString (@"Add songs to play", "Prompt in media item picker"); // The media item picker uses the default UI style, so it needs a default-style // status bar to match it visually [[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleDefault animated: YES]; [self presentModalViewController: picker animated: YES]; [picker release]; I'm using this code in my app and the Leaks instrument highlights a leak on the line: [self presentModalViewController: picker animated: YES]; I think that this is because this line retains a reference to picker which cannot be subsequently released. Is there any way around this?

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  • Releasing NSData causes exception...

    - by badmanj
    Hi, Can someone please explain why the following code causes my app to bomb? NSData *myImage = UIImagePNGRepresentation(imageView.image); : [myImage release]; If I comment out the 'release' line, the app runs... but a few times calling the function containing this code and I get a crash - I guess caused by a memory leak. Even if I comment EVERYTHING else in the function out and just leave those two lines, when the release executes, the app crashes. I'm sure this must be a newbie "you don't know how to clean up your mess properly" kind of thing ;-) Cheers, Jamie.

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  • NSOperation for animation loop causes strange scrolling behaviour

    - by Tricky
    Hi, I've created an animation loop which I run as an operation in order to keep the rest of my interface responsive. Whilst almost there, there is still one remaining issue. My UIScrollViews don't seem to be reliably picking up when a user touch ends. What this means is, for example, if a user drags down on a scroll view, when they lift their fingers the scrollview doesn't bounce back into place and the scrollbar remains visible. As if the finger hasn't left the screen. It takes another tap on the scrollview for it to snap to its correct position and the scrollbar to fade away... Here's the loop I created in a subclassed NSOperation: (void)main { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSRunLoop *runLoop = [NSRunLoop currentRunLoop]; _displayLink = [[CADisplayLink displayLinkWithTarget: self selector: @selector(animationLoop:)] retain]; [_displayLink setFrameInterval: 1.0f]; [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode: NSRunLoopCommonModes]; while (![self isCancelled]) { NSAutoreleasePool *loopPool = [[NSAutoreleasePool alloc] init]; [runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]; [loopPool drain]; } [_displayLink invalidate]; [pool release]; } DOes anyone have any idea what might be going on here, and even better how to fix it... Thanks!

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  • Where are events in Cocoa Touch?

    - by yesenin
    Hi all! I learn Cocoa Touch several days, and today have stuck while looking for way to implement a custom event. Event that I can see in Connection Inspector for my UIView subclass. What I have: There are a UILabel and MyView:UIView on MainVindow. MyView contains a UISlider. Interfaces for Controller and MyView // Controller.h @interface Controller : NSObject { IBOutlet UILabel *label; IBOutlet MyView *myView; } // I suppose that there should be something like -(IBAction) changeLabelValue for myView event @end // MyView.h @interface MyView : UIView { IBOutlet UISlider *slider; float value; } - (IBAction) changeValue; //for slider "Changed Value" event What I want: Add something in MyView that allows it to rise a event after change value. Can anybody help me? My main area in programming is .NET and I begin think that its terminology is not appropriate for this case. Thanks.

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  • Core Data inserting objects

    - by Joe
    I'm trying to get my head around Core Data on the iphone. This is code from Apple's 'Navigation based app using Core data' template (method - insertNewObject) // Create a new instance of the entity managed by the fetched results controller. NSManagedObjectContext *context = [fetchedResultsController managedObjectContext]; NSEntityDescription *entity = [[fetchedResultsController fetchRequest] entity]; NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context]; It seems completely counter intuitive to me that the fetched results controller is used when inserting a new object. I changed the code to this: NSEntityDescription *entity = [NSEntityDescription entityForName:@"Event" inManagedObjectContext:managedObjectContext]; NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:managedObjectContext]; which works just as well and does not require access to the fetch request. Am I missing something here? Is there any good reason to use the fetched results controller in the insert method?

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  • Adding Help to a Cocoa App

    - by enchilada
    I want to add a simple one-page HTML page help to my Cocoa app. Can you tell me how to do it? I assume I just have to throw in one lousy .html (and maybe one .css?) file somewhere into my Cocoa project in Xcode?

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  • [Cocoa] Binding CoreData Managed Object to NSTextFieldCell subclass

    - by ndg
    I have an NSTableView which has its first column set to contain a custom NSTextFieldCell. My custom NSTextFieldCell needs to allow the user to edit a "desc" property within my Managed Object but to also display an "info" string that it contains (which is not editable). To achieve this, I followed this tutorial. In a nutshell, the tutorial suggests editing your Managed Objects generated subclass to create and pass a dictionary of its contents to your NSTableColumn via bindings. This works well for read-only NSCell implementations, but I'm looking to subclass NSTextFieldCell to allow the user to edit the "desc" property of my Managed Object. To do this, I followed one of the articles comments, which suggests subclassing NSFormatter to explicitly state which Managed Object property you would like the NSTextFieldCell to edit. Here's the suggested implementation: @implementation TRTableDescFormatter - (BOOL)getObjectValue:(id *)anObject forString:(NSString *)string errorDescription:(NSString **)error { if (anObject != nil){ *anObject = [NSDictionary dictionaryWithObject:string forKey:@"desc"]; return YES; } return NO; } - (NSString *)stringForObjectValue:(id)anObject { if (![anObject isKindOfClass:[NSDictionary class]]) return nil; return [anObject valueForKey:@"desc"]; } - (NSAttributedString*)attributedStringForObjectValue:(id)anObject withDefaultAttributes:(NSDictionary *)attrs { if (![anObject isKindOfClass:[NSDictionary class]]) return nil; NSAttributedString *anAttributedString = [[NSAttributedString alloc] initWithString: [anObject valueForKey:@"desc"]]; return anAttributedString; } @end I assign the NSFormatter subclass to my cell in my NSTextFieldCell subclass, like so: - (void)awakeFromNib { TRTableDescFormatter *formatter = [[[TRTableDescFormatter alloc] init] autorelease]; [self setFormatter:formatter]; } This seems to work, but is extremely patch. On occasion, clicking to edit a row will cause its value to nullify. On other occasions, the value you enter on one row will populate other rows within the table. I've been doing a lot of reading on this subject and would really like to get to the bottom of this. What's more frustrating is that my NSTextFieldCell is rendering exactly how I would like it to. This editing issue is my last obstacle! If anyone can help, that would be greatly appreciated.

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  • How can I store Google Maps search results in an array?

    - by Thomas
    Hi All, I'm working on an app where I need to query Google for businesses near a current location. How do I go about storing them in an array? I don't want to exit the app and open Google Maps, I want to be able to display the addresses in a list format (Table View, I suppose). Any help would be greatly appreciated. Thanks! Thomas

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  • Memory leak when returning object

    - by Yakattak
    I have this memory leak that has been very stubborn for the past week or so. I have a class method I use in a class called "ArchiveManager" that will unarchive a specific .dat file for me, and return an array with it's contents. Here is the method: +(NSMutableArray *)unarchiveCustomObject { NSMutableArray *array = [NSMutableArray arrayWithArray:[NSKeyedUnarchiver unarchiveObjectWithFile:/* Archive Path */]]; return array; } I understand I don't have ownership of it at this point, and I return it. CustomObject *myObject = [[ArchiveManager unarchiveCustomObject] objectAtIndex:0]; Then, later when I unarchive it in a view controller to be used (I don't even create an array of it, nor do I make a pointer to it, I just reference it to get something out of the array returned by unarchiveCustomIbject (objectAtIndex). This is where Instruments is calling a memory leak, yet I don't see how this can leak! Any ideas? Thanks in advance. Edit: CustomObject initWithCoder added: -(id)initWithCoder:(NSCoder *)aDecoder { if (self = [super init]) { self.string1 = [aDecoder decodeObjectForKey:kString1]; self.string2 = [aDecoder decodeObjectForKey:kString2]; self.string3 = [aDecoder decodeObjectForKey:kString3]; UIImage *picture = [[UIImage alloc] initWithData:[aDecoder decodeObjectForKey:kPicture]]; self.picture = picture; self.array = [aDecoder decodeObjectForKey:kArray]; [picture release]; } return self; }

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  • Accessing the stringValue from NSTextFields on different NIBs

    - by Kyle Zaragoza
    I'm having an extremely difficult time trying to access information from an object (e.g. an NSTextField) that is located on a NIB other than my "MainMenu.nib". My current setup: I have a MainMenu.xib that contains only a toolbar at the top and an NSView. I have four other .xib files containing custom NSViews and each of their File Owner's are assigned to a NSViewController subclass which I have created for each. My MainMenu.xib contains an object that is set to my WindowController subclass that takes care of swapping the fours views into the NSView on my MainMenu.xib. All of this works fantastic. Where I have a problem: I have another class that acts as the brains to my application which sends and receives data from an online server, all of the methods I have created rely on inputs from the user that are located on the individual .xibs that swap into my MainMenu.xib's NSview. Unfortunately I have no idea on how to grab the information from the NSTextFields, textViews, etc. that are located on my individual .xib files. What I've tried: I have tried setting the File Owner's of the four individual .xibs to my "brains" class and connecting outlets defined in my "brains".h, but when I call [textField stringValue] I receive a NULL response. I'm thinking this is because I'm creating multiple instances of my "brains" class but not totally sure. Any help on accessing information from textFields from other nibs would be a great benefit, thanks in advance.

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  • Check if NSURL is Local File

    - by golfromeo
    This is a pretty simple question- how can I check if a NSURL is linking to a local file? I know, RTFM, but I checked the documentation and I don't seem to see any methods related to this. The only methods I did find were -isFileReferenceURL and -isFileURL, but I think these only check if the URL directly links to a file. note: I'm making an iPhone app, so by "local file" I mean a .html file stored in the project's resources. Thanks for any help in advance.

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  • How to dynamically replace a method implementation in ObjC2?

    - by Abhi
    I am trying to learn how to write plugins using SIMBL. I got my plugin to load with the target application, and also know the method that I wish to override. However, I am not able to use class_getInstanceMethod correctly based on snippets on the Internet. Have things changed in OSX 10.6 and/or ObjC2? The following code from culater.net gives "Dereferencing pointer to incomplete type" on the second-last statement: BOOL DTRenameSelector(Class _class, SEL _oldSelector, SEL _newSelector) { Method method = nil; // First, look for the methods method = class_getInstanceMethod(_class, _oldSelector); if (method == nil) return NO; method->method_name = _newSelector; return YES; } Is there a complete example of how to override a method using SIMBL plugins? Thanks!

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