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• Objective C defining UIColor constants

  - by futureelite7

  Hi, I have a iPhone application with a few custom-defined colors for my theme. Since these colors will be fixed for my UI, I would like to define the colors in a class to be included (Constants.h and Constants.m). How do I do that? (Simply defining them does not work because UIColors are mutable, and would cause errors - Initalizer not constant). /* Constants.h */ extern UIColor *test; /* Constants.m */ UIColor *test = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0]; Thanks!

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• Is Objective C fast enough for DSP/audio programming

  - by morgancodes

  I've been making some progress with audio programming for iPhone. Now I'm doing some performance tuning, trying to see if I can squeeze more out of this little machine. Running Shark, I see that a significant part of my cpu power (16%) is getting eaten up by objc_msgSend. I understand I can speed this up somewhat by storing pointers to functions (IMP) rather than calling them using [object message] notation. But if I'm going to go through all this trouble, I wonder if I might just be better off using C++. Any thoughts on this?

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• user disallowed geolocation - notify user second time

  - by Dror

  When trying to get geolocation on iPhone the first time - I declined. Every other time I want to get the location (before another reload of the page) I get no response (no error and no success): navigator.geolocation.getCurrentPosition( function (location) { ig_location.lat = location.coords.latitude; ig_location.lng = location.coords.longitude; alert('got it!'); }, function(PositionError) { alert('failed!' + PositionError.message); } ); Is there a way to notify the user every time I fail to get the location? (I do not need to use watchPosition...)

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• Reading a plist utf-8 value as utf-16

  - by ennuikiller

  I'm working on an iphone app that needs to display superscripts and subscripts. I'm using a picker to read in data from a plist but the unicode values aren't being displayed corretly in the pickerview. Subscripts and superscripts are not being recognized. I'm assuming this is due to the encoding of the plist as utf-8, so the question is how do a convert a plist string encoding from utf-8 to utf-16 ? Just a little more elaboration: If I do this it displays properly at least in a textfield: NSString *equation = @"x\u00B2 + y\u00B2 = z\u00B2" However if I define the same string in a plist and try to read it in and assign it to a string and display it on a pickerview it just displays the the encoding and not the superscripts. @Matt: thanks for your suggestion the unicode is being escaped that is \u00B2 = \u00B2. Googling for "escaped values in plists" returned no useful results, and I haven't been able to use the keyboard cmd-ctrl-shift-+ to work. Any further suggestions would be greatly appreciated!!

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• How do I rotate only some views when working with a uinavigationcontroller as a tab of a uitabbarcon

  - by maxpower

  Here is a flow that I can not figure out how to work. ( when I state (working) it means that in that current state the rules for orientation for that view are working correctly) First View: TableView on the stack of a UINavigationController that is a tab of UITabBarController. TableView is only allowed to be portrait. (working) When you rotate the TableView to landscape a modal comes up with a custom UIView that is like a coverflow (which i'll explain the problem there in a moment). A Selection made on tableview pushes a UIScrollview on to the stack. UIScrollView is allowed all orientations. (working) When UIScrollView is in landscape mode and the user hits back they are taken to the custom UIView that is like the coverflow and only allows landscape. The problem is here. Because the UIScrollView allows full rotation it permitted the TableView to rotate as well to landscape. I have a method attached to a notification "UIDeviceOrientationDidChangeNotification" that checks to see if the custom view is the current controller and if it is and if the user has rotated back to portrait I need to pop the custom view and show the table view. The table view has to rotate back to portrait, which really is okay as long as the user doesn't see it. When I create custom animations it works pretty good except for some odd invisible black box that seems to rotate with the device right before I fade out the customview to the tableview. Further inorder to ensure that my tableview will rotate to portrait I have to allow the customview to support all orientations because the system looks to the current view (in my code) as to whether or not that app is allowed to rotate to a certain orientation. Because of this I many proposed solutions will show the customview rotating to portrait as the table view comes back to focus. My other problem is very similar. If you are viewing the tableview and rotate the modalview of the customview is presented. When you make a selection on this view it pushes the UIScrollview onto the stack, but because the Tableview only supports portrait the UIScrollview comes in in portrait while the device is in landscape mode. How can I overcome these awful blocks? This is my current attempt: When it comes to working with UITabBarController the system really only cares what the tabbarcontroller has to say about rotation. Currently whenever a view loads it reports it supported orientations. TabBarController.m - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { switch (self.supportedOrientation) { case SupportPortraitOrientation: [[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES]; return (interfaceOrientation == UIInterfaceOrientationPortrait); break; case SupportPortraitUpsideDownOrientation: [[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES]; return (interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown); break; case SupportPortraitAllOrientation: [[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES]; return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown); break; case SupportLandscapeLeftOrientation: [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); break; case SupportLandscapeRightOrienation: [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; return (interfaceOrientation == UIInterfaceOrientationLandscapeRight); break; case SupportLandscapeAllOrientation: [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight); break; case SupportAllOrientation: if (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight) { [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES]; }else { //[[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES]; } return YES; break; default: return (interfaceOrientation == UIInterfaceOrientationPortrait); break; } } This block of code is part of my UINavigationController and is in a method that responds to the UIDeviceOrientationDidChangeNotification Notification. It is responsible for poping the customview and showing the tableview. There are two different versions in place that originally were for two different versions of the SDK but both are pretty close to solutions. The reason the first is not supported on 3.0 is for some reason you can't have a view showing and then showen as a modal view. Not sure if that is a bug or a feature. The second solution works pretty good except that I see an outer box rotating around the iphone. if ([[self topViewController] isKindOfClass:FlowViewController.class]) { NSString *iphoneVersion = [[UIDevice currentDevice] systemVersion]; double version = [iphoneVersion doubleValue]; if(version > 3.0){ //1st solution //if the delivered app is not built with the 3.1 SDK I don't think this will happen anyway //we need to test this [self presentModalViewController:self.flowViewController animated:NO]; //[self toInterfaceOrientation:UIDeviceOrientationPortrait animated:NO]; [self popViewControllerAnimated:NO]; [self setNavigationBarHidden:NO animated:NO]; [self dismissModalViewControllerAnimated:YES]; }else{ //2nd solution DLog(@"3.0!!"); //[self toInterfaceOrientation:UIDeviceOrientationPortrait animated:NO]; CATransition *transition = [CATransition animation]; transition.duration = 0.50; transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; transition.type = kCATransitionPush; transition.subtype = kCATransitionFade; CATransition *tabBarControllerLayer = [CATransition animation]; tabBarControllerLayer.duration = 0.50; tabBarControllerLayer.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; tabBarControllerLayer.type = kCATransitionPush; tabBarControllerLayer.subtype = kCATransitionFade; [self.tabBarController.view.layer addAnimation:transition forKey:kCATransition]; [self.view.layer addAnimation:transition forKey:kCATransition]; [self popViewControllerAnimated:NO]; [self setNavigationBarHidden:NO animated:NO]; } [self performSelector:@selector(resetFlow) withObject:nil afterDelay:0.75]; } I'm near convinced there is no solution except for manual rotation which messes up the keyboard rotation. Any advice would be appreciated! Thanks.

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• Removing facebook API from my project

  - by mac_55

  I'm looking to remove the Facebook API from my iPhone project for 2 reasons: 1) My Facebook functionality is unfinished and I'd like to submit the app minus ALL of the FB functionality 2) I don't want to include the Facebook API as it contains encryption and I don't want to fill out additional forms etc. So. I need a simple way to remove all of my Facebook functionality and not put build the facebook API as part of the binary. I was thinking of commenting out my FB code... but how do I disconnect the FB api so that I can easily put it back in later? Thanks!

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• UIScrollview doesnt resize in NavigationController when rotated

  - by Icky

  Hey, I have been dealing with this issue for 2 days now, not able to find a solution. I have a navigationcontroller as a root view controller. This one pushes a UIViewcontroller which in turn has a UIScrollview I created with IB. Additionally there is the Navigation bar. My problem arises, when I rotate the IPhone to Landscape mode. In -(void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation I want my scrollview to take up the full width (480 px) which it doesnt. I am able to set the frame of the navigation bar to full width perfectly fine, but not the scrollview. I have read that this might be because of the autoresizing masks set in the rooviewcontroller but I have tried out a couple of solutions - none worked for me. Any ideas on how to challenge the problem? Dont know where to start looking.

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• Quick way to get an NSDictionary from an XML NSData representation?

  - by dontWatchMyProfile

  I've loaded an XML file as NSData into memory and parse over the elements using NSXMLParser. Although it works, it's a very ugly and hard to maintain code since there are about 150 different elements to parse. I know there are nice third-party solutions, but I want to keep it with the iPhone SDK for purpose of practice and fun. So I thought: Why not convert that XML file into an NSDictionary? Having this, I could use fast enumeration to go over the elements. Or is it just the same amount of ugly code needed to parse and process an XML right away with NSXMLParser? Would I build up an NSDictionary for every found node in the XML and create a huge one, containing the whole structure and data? Or is there an even simpler way?

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• AdMob and UINavigationControllers

  - by Ward

  I'm playing around with AdMob and I"m trying to get something going with an auto-rotating view inside a uinavigationcontroller. I have the ad at the top of the screen. Not sure if this is the right approach, but in my LoadView method I have: self.navigationController.view.frame = CGRectMake(0,48,320,432); The navbar appears below the ad. When I rotate the phone to landscape is there a way to get the navbar (which is now across the top) to be 432px wide so it doesn't get cut off under the ad? I tried writing a method that is called when the device orientation changes, but it seems like manipulating the view on the navigationcontroller screws things up for every orientation except portrait. The view keeps getting shorter until it disappears. Thanks, Howie

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• application: didFinishLaunchingWithOptions doesn't execute, but RootViewController: viewDidLoad does

  - by BeachRunnerJoe

  I'm playing around with the iPad SplitView template and it was working fine before I started swapping out view objects in my RootViewController. When it was working fine, the application:didFinishLaunchingWithOptions method would be called and would setup my persistant store objects, then the RootViewController:viewDidLoad method would be called to populate my rootView with data from my store. I opened up IB and started swapping out view objects in my RootView and now the application:didFinishLaunchingWithOptions method never gets called, but the RootViewController:viewDidLoad method still does. Obviously, the app crashes because the viewDidLoad method depends on the successful execution of the didFinishLauchingWIthOptions method to setup the persistent store objects. Does anyone have any thoughts on what is causing this or how I can go about investigating what's causing this? I'm obviously new to iPhone OS development, so I apologize if this questions is absurd in any way. Thanks so much in advance for your help!

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• Preload/predisplay tiles in a CATiledLayer?

  - by jemmons

  On the iPhone (though I imagine it's an equally valid question in Cocoa) I have a UIScrollView around a UIView backed by a CATiledLayer. The way it works by default is to load any uncached/unfetched tiles when my viewport scrolls over a blank section of the CATiledLayer. What I would like to know is if there's a way to trigger CATiledLayer to load a tile that's not actively being displayed? I would like to, for example, preload all tiles contiguous to the currently displayed tile while they are still offscreen, thus avoiding flashing a blank screen that fades in to the image once it's loaded asynchronously. Any ideas?

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• Memory efficient way of inserting an array of objects with Core Data

  - by randombits

  I'm working on a piece of code for an iPhone application that fetches a bunch of data from a server and builds objects from it on the client. It ends up creating roughly 40,000 objects. They aren't displayed to the user, I just need to create instances of NSManagedObject and store them to persistent storage. Am I wrong in thinking that the only way to do this is to create a single object, then save the context? is it best to create the objects all at once, then somehow save them to the context after they're created and stored in some set or array? If so, can one show some example code for how this is done or point me in the direction to code where this is done? The objects themselves are relatively straight forward models with string or integer attributes and don't contain any complex relationships.

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• networkActivityIndicatorVisible on iOS 4

  - by user365660

  Hi, I just downloaded xcode 3.2.3 (seperate directory installation) and ios 4 to my iphone. I'm having a problem with networkActivityIndicatorVisible. This works on 3.1.3, both phone and simulator. My code is (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; UIApplication* app2 = [UIApplication sharedApplication]; app2.networkActivityIndicatorVisible = YES; [self loadSources]; // Loads data in table view app2.networkActivityIndicatorVisible = NO; } I get the same effect in the simulator and on the phone both with ios 4.o The networkActivity indicator becomes visible for a fraction of a second and then invisible and this is done after loading the data for the tableView. Has something changed with this? Teo

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• STORE KIT - Cannot connect to iTunes Store

  - by dassenno

  Hi, this is my situation: a) I have an app of which i want to add in app purchase. I created an update version of the app. I uploaded a binary and rejected. b) On the provisioning portal i created an app-id with unique id ( not wildchard * ) like: com.mycompanyname.myappintheoryblablabla c) I created a new provisioning profile based on the above app-id d) i installed via xcode the prov profile on the development device and set in the app this profile in the field "code signing identity" e) On itunes connect i created 2 item for the in app purchase and set ad "clear for sale" f) in the application code i implemened the basic calls taken from the Apple sample what i am getting is ( as stated in the subject ) CANNOT CONNECT TO ITUNES STORE. Any clue? Can anyone help me? Regards

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• Realtek drivers for Redhat Linux

  - by kv

  Can any one provide link to: RedHat Linux realteak 8168C Network Drivers Zenith

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• How do I turn off accelerometer input for my flipside view

  - by user308050

  I have an iPhone 3.1.3 app which has only 2 methods of input in its main view. It has an info button to switch to a flipside view, and the only other input it takes in the main view is accelerometer movement. I want to switch off the accelerometer input when in the flipside view but haven't been able to find out how. I have the main view controller set as an accelerometer delegate, but did not do the same for the flipside view controller, though I suspect that it inherited it from the main view controller. I am really new to xcode and objective c, I have been reading these forums and a couple of developer books, but if anyone has any tips on other good places to look, please let me know.

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• Video loads but doesn't play with MPMoviePlayerController in iPad

  - by hgpc

  I'm using MPMoviePlayerController to play videos in an iPad app. Everything works well on the iPad simulator. On an actual device, the videos load but don't play, even if I press the play button. I can move the slider and see different frames of the video, but it never plays. I'm using the following code: moviePlayer = [[MPMoviePlayerController alloc] init]; moviePlayer.shouldAutoplay = YES; moviePlayer.contentURL = video.urlVideo; moviePlayer.view.frame = videoPlayerContainer.bounds; moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [videoPlayerContainer addSubview:moviePlayer.view]; moviePlayer.controlStyle = MPMovieControlStyleEmbedded; [moviePlayer play]; Help?

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• setting enablesReturnKeyAutomatically on UISearchBar

  - by Erik Carlson

  Hi There, I'm writing for iphone OS 3.1.3. I want the search button in the keyboard from my UISearchBar to have the search button enabled all the time. If this was any old UITextField (not a search bar) the property would be enablesReturnKeyAutomatically. I have tried setting this using the example given at http://discussions.apple.com/thread.jspa?messageID=8457910 which suggests: UITextField *searchTextField ; searchTextField = [[searchBar subviews]objectAtIndex:0]; searchTextField.enablesReturnKeyAutomatically = NO ; Should work. unfortunately it crashes: 2010-05-20 08:36:18.284 ARemote[5929:207] *** -[UISearchBarBackground setEnablesReturnKeyAutomatically:]: unrecognized selector sent to instance 0x3b31980 2010-05-20 08:36:18.284 ARemote[5929:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UISearchBarBackground setEnablesReturnKeyAutomatically:]: unrecognized selector sent to instance 0x3b31980' I have also tried ((UITextField *)[(NSArray *)[searchBar subviews] objectAtIndex:0]).enablesReturnKeyAutomatically = NO;</code> Which gives similar results. Any ideas? Cheers Erik

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• How to format float to 2 decimals in objective C

  - by iamdadude

  I have a string that I'm converting to a float that I want to check for values in an if statement. The original float value is the iPhone's trueHeading that is returned from the didUpdateHeading method. When I convert the original float to a string using @"%.2f" it works perfectly, but what I'm trying to do is convert the original float number to the same value. IF I just convert the string to [string floatValue] I get the same original float number, and I don't want that. To make it short and simple, how do I take an existing float value and just get the first 2 decimals?

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• How can I detect touch events on a UIImageView inside a deep hierarchy of UIViews?

  - by jester

  I am developing a simple game on iPhone and I started with a View based application, and through the UIViewController I am loading a custom UIView that contains some more UIViews and some UIImageViews. I want to detect touch events on some of the UIImageViews, but I wasn't able so far. I've created a second project for testing purposes and figured that UIImageViews handle touch events when the hierarchy is like : UIViewController - UIView - UIImageView, but when it's like : UIViewController - UIView - UIView - UIImageView they are not detected. Notes: - userInteractionEnabled is YES in all cases - all UIViews and UIImageViews I mention above are custom subclasses. Can you think of any reason why, when a custom UIImageView gets deeper in the view hierarchy can't receive touch events?

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• AVURLAsset cannot load with remote file

  - by Quentin

  Hi, I have a problem using AVURLAsset. NSString * const kContentURL = @ "http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8"; ... NSURL *contentURL = [NSURL URLWithString:kContentURL]; AVURLAsset *asset = [AVURLAsset URLAssetWithURL:contentURL options:nil]; [asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey] completionHandler:^{ ... NSError *error = nil; AVKeyValueStatus status = [asset statusOfValueForKey:tracksKey error:&error]; ... } In the completion block, the status is AVKeyValueStatusFailed and the error message is "Cannot Open". All exemples I have seen, use a local file, so maybe there is a problem using a remote file... Regards, Quentin

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• Serialize struct with pointers to NSData

  - by leolobato

  Hey guys, I need to add some kind of archiving functionality to a Objective-C Trie implementation (NDTrie on github), but I have very little experience with C and it's data structures. struct trieNode { NSUInteger key; NSUInteger count, size; id object; __strong struct trieNode ** children; __strong struct trieNode * parent; }; @interface NDTrie (Private) - (struct trieNode*)root; @end What I need is to create an NSData with the tree structure from that root - or serialize/deserialize the whole tree some other way (conforming to NSCoding?), but I have no clue how to work with NSData and a C struct containing pointers. Performance on deserializing the resulting object would be crucial, as this is an iPhone project and I will need to load it in the background every time the app starts. What would be the best way to achieve this? Thanks!

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• OpenGL ES Simple Undo Last Drawing

  - by Erika

  Hi Everyone, I am trying to figure out how to implement a simple "undo" of last drawing action on the iPhone screen. I draw by first preparing the frame buffer: [EAGLContext setCurrentContext:context]; glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer); I then prepare the vertex array and draw this way: glVertexPointer(2, GL_FLOAT, 0, vertexBuffer); glDrawArrays(GL_POINTS, 0, vertexCount); glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer); [context presentRenderbuffer:GL_RENDERBUFFER_OES]; How do I simple undo this last action? There has to be a way to save previous state or an built-in OpenGL ES function, I would think. Thanks

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• MKMapView Route/Directions

  - by Mark

  I found that the Google Maps API supports Directions through: var map; var directionsPanel; var directions; function initialize() { map = new GMap2(document.getElementById("map_canvas")); directionsPanel = document.getElementById("my_textual_div"); map.setCenter(new GLatLng(49.496675,-102.65625), 3); directions = new GDirections(map, directionsPanel); directions.load("from: 500 Memorial Drive, Cambridge, MA to: 4 Yawkey Way, Boston, MA 02215 (Fenway Park)"); } So how can this be translated into Objective-C so it can be retrieved by the iPhone? I know how to draw a line on MKMapView I just need the geolocations for the route. Or perhaps there is a different way to get the route between two geolocation points. Please let me know, Thanks in advance.

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• TTImageView not working

  - by Ajay Sawant

  Guys, I am new to IPhone and using following code to render the image from remote server using TTImageView from Three20 framework with the help of following code TTImageView* imageView = [[[TTImageView alloc] initWithFrame:CGRectMake(30, 30, 0, 0)] autorelease]; //Working OK //imageView.urlPath = @"http://prosares.co.cc/Images/background.jpg"; //No Working imageView.urlPath = @"http://prosares.co.cc/Images/backgroundTest.jpg"; [self.view addSubview:imageView]; As shown above if I am trying to load background.jpg it's getting loaded correctly but for some reason backgroundTest.jpg is not loading at all. the only diffrance in these images are the size, is there any restriction on the image size that I can load in TTImageView ? Can someone please help me to debug this issue? Thanks Ajay Sawant

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