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  • Using UIImageView for a flipbook anim on iphone

    - by Joey
    I'm using UIImageView to run a flipbook anim like this: mIntroAnimFrame = [[UIImageView alloc] initWithFrame:CGRectMake( 0, 0, 480, 320); mIntroAnimFrame.image = [UIImage imageNamed:@"frame0000.tif"]; Basically, when determine it is time, I flip the image by just calling: mIntroAnimFrame.image = [UIImage imageNamed:@"frame0000.tif"]; again with the right frame. Should I be doing this differently? Are repeated calls to set the image this way possibly bogging down main memory, or does each call essentially free the previous UIImage because nothing else references it? I suspect the latter is true. Also, is there an easy way to preload the images? The anim seems to slow down at times. Should I simply load all the images into a dummy UIImage array so they are preloaded, then refer to it when I want to show it with mIntroAnimFrame.image = mPreloadedArray[i]; ?

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  • How to efficiently show many Images? (iPhone programming)

    - by Thomas
    In my application I needed something like a particle system so I did the following: While the application initializes I load a UIImage laserImage = [UIImage imageNamed:@"laser.png"]; UIImage *laserImage is declared in the Interface of my Controller. Now every time I need a new particle this code makes one: // add new Laserimage UIImageView *newLaser = [[UIImageView alloc] initWithImage:laserImage]; [newLaser setTag:[model.lasers count]-9]; [newLaser setBounds:CGRectMake(0, 0, 17, 1)]; [newLaser setOpaque:YES]; [self.view addSubview:newLaser]; [newLaser release]; Please notice that the images are only 17px * 1px small and model.lasers is a internal array to do all the calculating seperated from graphical output. So in my main drawing loop I set all the UIImageView's positions to the calculated positions in my model.lasers array: for (int i = 0; i < [model.lasers count]; i++) { [[self.view viewWithTag:i+10] setCenter:[[model.lasers objectAtIndex:i] pos]]; } I incremented the tags by 10 because the default is 0 and I don't want to move all the views with the default tag. So the animation looks fine with about 10 - 20 images but really gets slow when working with about 60 images. So my question is: Is there any way to optimize this without starting over in OpenGl ES? Thank you very much and sorry for my english! Greetings from Germany, Thomas

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  • UIPickerView issues - iphone

    - by Rob J
    I have the following: - (NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView { return 2; } - (NSInteger) pickerView:(UIPickerView *) pickerView numberOfRowsInComponent:(NSInteger) component { return [genderPickerData count]; return [agePickerData count]; } When I do this, the UIPicker is split into 2 components, but the PickerData is only being represented for gender on both pickers. I am trying to figure out through Apple's confusing documentation on how I reference each individual component but can't seem to figure it out.

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  • iPhone text editor syntax highlight

    - by Jack
    Hi, As the title suggests, I am trying to add a text editor with syntax highlighting to a project. I have asked a similar question before and got pointed in the direction of either: a) a UITextView and NSAttributedStrings Or b) a web view Can anyone shed some light on using either of These methods or suggest an alternative? I have searched around for a few hours now and have found nothing. Jack

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  • ABGroupAddMember - Cannot Add Contact to Group (iPhone Address Book)

    - by cookeecut
    Hi, I wonder if someone can help me out on this: I'm writing some code to copy a set of contacts received through a web application into the Address Book. I want to put all these new contacts under a certain group. My code successfully creates the group and adds the contacts into the address book. However, the 'ABGroupAddMember' operation fails. It fails without an error and the result it returns is true, meaning that according to the debugger the contact should have been added to the group. However, this does not work. The portion of my loop code that adds the contact to the address book and then assigns it to the group is this: ABAddressBookAddRecord(addressBook,person, &anError); ABAddressBookSave(addressBook,&anError); ABGroupAddMember(fusionLiveGroupRef,person, &anError); ABAddressBookSave(addressBook,&anError); All references are valid. No errors are returned. All operations return true. What is going wrong?

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  • Playing wav files with AudioServices in iPhone

    - by Biranchi
    Hi All, I am trying to play two .wav files in my appllication, but i am only able to play the first wav file , the second file is not at all playing. I have added the AudioToolbox framework. In my .h file i have included the Audiotoolbox.h file and has the following declarations //Beep Sound SystemSoundID soundFileObject; SystemSoundID recycleFileObject; In my .m file i am registering both the wav files as following CFURLRef soundFileURLRef = CFBundleCopyResourceURL (CFBundleGetMainBundle (),CFSTR ("Beep"),CFSTR ("wav"),NULL ); AudioServicesCreateSystemSoundID (soundFileURLRef,&soundFileObject ); CFURLRef soundFileURLRef2 = CFBundleCopyResourceURL (CFBundleGetMainBundle (),CFSTR ("Recycle"),CFSTR ("wav"),NULL ); AudioServicesCreateSystemSoundID (soundFileURLRef2,&recycleFileObject ); And i have written two methods for playing each file individually. -(void)playBeepSound { NSLog(@"Beep sound called : %d", soundFileObject); AudioServicesPlaySystemSound (soundFileObject); } -(void)playRecycleSound { NSLog(@"Recycle sound called : %d", recycleFileObject); AudioServicesPlaySystemSound (recycleFileObject); } But i am only able to play the Beep sound , but not the second sound wav file. What is the error ??? Thanks

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  • Google Translate API for iPhone - UTF8 problem in Chinese Translation

    - by Sky Chen
    I've tested a workable translation API url by: http://translate.google.com/translate_a/t?client=t&text=%E5%BB%A3%E5%A0%B4&langpair=zh|zh-CN And it returns the correct result as the following which is in JSON format: {"sentences":[{"trans":"??","orig":"??","translit":"Guangchang"}],"src":"zh-CN"} However, when I try to use this function in XCode, I experienced this problem ... Here is my code: NSData *data; NSString *urlPath = [NSString stringWithFormat:@"/translate_a/t?client=t&text=%@&langpair=zh|zh-CN",qText]; NSURL *url = [[NSURL alloc] initWithScheme:@"http" host:@"translate.google.com" path:urlPath]; NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:url]; [request setHTTPMethod:@"GET"]; NSURLResponse *response; NSError *error; data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error]; NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; //Problem's here. It returns nil. NSLog(result); Initially I guessed it's encoding problem so I tried other encoding as well (NSISOLatin1StringEncoding) , but I got wrong answer: {"sentences":[{"trans":"ã ","orig":"ã ","translit":"Tu¨¯ "}],"src":"zh-CN"} Does anyone know how to solve this problem? Thank you very much!

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  • Tell The Program What To Do When No Save Data Is Found NSUserDefaults, iPhone

    - by Stumf
    Hello all, I have saved data which was saved using NSUserDefaults. I was under the impression that if there was nothing saved to the key already (first time app is run) it would default to 0. This however doesn't seem to be the case. Here is what I have: To save: - (void)viewWillDisappear:(BOOL)animated { [[NSUserDefaults standardUserDefaults] setInteger:setbatteryHealthCalculated forKey:@"healthValue"]; [[NSUserDefaults standardUserDefaults] synchronize]; } To load: - (void) viewWillAppear:(BOOL)animated { NSInteger setbatteryHealthCalculated = [[NSUserDefaults standardUserDefaults] integerForKey:@"healthValue"]; } To check for save value: - (IBAction)check{ NSInteger setbatteryHealthCalculated = [[NSUserDefaults standardUserDefaults] integerForKey:@"healthValue"]; if (setbatteryHealthCalculated = 0) { [self performSelector:@selector(displayAlert) withObject:nil]; }

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  • Pre-crash iphone symptoms - odd user position, volume change

    - by BankStrong
    I'm seeing intermittent strange symtoms in my app: Blue blob (user position in MKMapView) starts "exploding" (odd, jerky animation). Can begin at startup and seems to indicate eventual problems. Speaker volume suddenly increases (back to level before I invoked kAudioSessionSetProperty_OtherMixableAudioShouldDuck). The app keeps running, but this change tells me to expect no more sounds from AVAudioPlayer. Also a reliable indicator of a future crash (on save, etc). I'm having trouble provoking this in the debugger (seems to only happen with movement in GPS). Any ideas to track it down?

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  • Querying current number of touches on screen without using events on iPhone

    - by nikhil
    I have an application that starts playing a sound when user touches the uiview and changing to different tones as the user slides the finger on the screen. The sound stops when the user lifts the finger. I am using the touchesBegan, Moved and Ended Events for this. My problem is touches Ended (and/or cancelled) is sometimes not fired properly and the sound keeps playing even after the finger is lifted from screen. So as a workaround I would like to implement a timer that would check for the number of touches on the screen and if it is zero it will check and stop the audioplayer if playing. I have been searching for some code that could get me the number of touches like UITouch *touches=[self getAllTouchesonScreen]; or something :)

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  • Password authentication in sqlite3 for iphone

    - by user271753
    Hey Guys .. I am new to programming in Objective C . I checked many tutorials on reading data in sqlite3 , but almost all of them have show the data in UITableView . I have a page where the user types in the password, the password lets say 1234 is saved in the database ( I have created a table already ) . I have got the database into the project folder . I just want a statement like if(databasepassword == correct from the uitextfield ) { show next page } else { password is incorrect.text } I will figure out on how to show the next page and display the password is incorrect.text I just want a method to cross check with the password saved in the database . How can I do that ? Regards

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  • Addressing a memory leak stops my UI from showing iphone

    - by dubbeat
    Hi I've being getting a memory leak warning with a UITabbarcontroller. If I release the tabbarcontroller the warning goes away but the tabbar will not show any content. If I debug the app with the warning still in it the app runs but will crash after a couple of minutes UITabBarController *tabBarController = [[UITabBarController alloc] init]; tabBarController.view.frame = CGRectMake(0, 0, 320, 460); tabBarController.viewControllers=localControllersArray; // Clean up objects we don't need anymore [promoTabOptionHome release]; [promoTabOptionInfo release]; [promoTabOptionEvents release]; [promoTabOptionBuy release]; [localControllersArray release]; // Finally, add the tab controller view to the parent view [self.view addSubview:tabBarController.view]; //[tabBarController release]; commenting out this line removes the warning but results in no content being shown

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  • iPhone OS: KVO: Why is my Observer only getting notified at applicationDidfinishLaunching

    - by nickthedude
    I am basically trying to implement an achievement tracking setup in my app. I have a managedObjectModel class called StatTracker to keep track of all sorts of stats and I want my Achievement tracking class to be notified when those stats change so I can check them against a value and see if the user has earned an achievement. I've tried to impliment KVO and I think I'm pretty close to making it happen but the problem I'm running into is this: So in the appDelegate i have an Ivar for my Achievement tracker class, I attach it as an observer to a property value of my statTracker core data entity in the applicationDidFinishLaunching method. I know its making the connection because I've been able to trigger a UIAlert in my AchievementTracker instance, and I've put several log statements that should be triggered whenever the value on the StatTracker's property changes. the log statement appears only once at the application launch. I'm wondering if I'm missing something in the whole object lifecycle scheme of things, I just don't understand why the observer stops getting notified of changes after the applicationDidFinishLaunching method has run. Does it have something to do with the scope of the AchievementTracker reference or more likely the reference to my core data StatTracker is going away once that method finishes up. I guess I'm not sure the right place to place these if that is the case. Would love some help. Here is the code where I add the observer in my appDidFinishLaunching method: [[CoreDataSingleton sharedCoreDataSingleton] incrementStatTrackerStat:@"timesLaunched"]; achievementsObserver = [[AchievementTracker alloc] init]; StatTracker *object = nil; object = [[[CoreDataSingleton sharedCoreDataSingleton] getStatTracker] objectAtIndex:0]; NSLog(@"%@",[object description]); [[CoreDataSingleton sharedCoreDataSingleton] addObserver:achievementsObserver toStat:@"refreshCount"]; here is the code in my core data singleton: -(void) addObserver:(id)observer toStat:(NSString *) statToObserve { NSLog(@"observer added"); NSArray *array = [[NSArray alloc] init]; array = [self getStatTracker]; [[array objectAtIndex:0] addObserver:observer forKeyPath:statToObserve options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld context:NULL]; } and my AchievementTracker: - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { NSLog(@"achievemnt hit"); //NSLog("%@", [change description]); if ([keyPath isEqual:@"refreshCount"] && ((NSInteger)[change valueForKey:@"NSKeyValueObservingOptionOld"] == 60) ) { NSLog(@"achievemnt hit inside"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"title" message:@"achievement unlocked" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:nil]; [alert show]; } }

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  • iPhone SDK: Progressive UITableView updates, smoothly animated

    - by boliva
    Hi all, There's something I've been trying to do with no success. I have an UITableView whose viewController is both its delegate and dataSource. On it I also have a mutableArray as a property, which basically acts as the tableView dataSource. This mutableArray gets continously updated from an online XML source. What I haven't been able to accomplish successfully is to animate the adding of new rows at the top of the tableView and the deletion of the oldest rows at its bottom (thinking I'll always going to show the same amount of data, say the latest 10 entries). The method I'm actually using is that, after finishing receiving and parsing the XML data I'm removing all the contents of the mutableArray and storing the new entries on it, to later reload the tableView (calling the 'reloadData' method). In between I'm using a CATransition in order to 'fade' the tableView from its previous to its new state. I tried using beginUpdates and endUpdates, with code for selectively removing the old rows from the tableView and adding the new ones to it, as well as to its datasource, however the animation takes place in the whole table instead of the affected rows only. What I want to accomplish is, after an update, to delete as many rows from the 'bottom' of the table as new entries I have retrieved, sliding the tableView down and adding the new rows at the top of it, smoothly animated. Best regards,

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  • iphone memory leaks and malloc?

    - by Brodie4598
    Okay so im finally to the point where I am testing my iPad App on an actual iPad... One thing that my app does is display a large (2mb) image in a scroll view. This is causing the iPad to get memory warnings. I run the app in the instruments to check for the leak. When I load the image, a leak is detected and i see the following in the allocations: ALl Allocations: 83.9 MB Malloc 48.55 MB: 48.55 MB Malloc 34.63 MB: 34.63 MB What im trying to understand is how to plug the leak obviously, but also why a 2MB image is causing a malloc of 20x that size I am very new to programming in obj-c so im sure this is an obvious thing, but I just cant figure it out. Here is the code:

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  • Iphone internet connection (Reachability)

    - by ludo
    Hi, I saw any post about Reachability but people doesn't really give the exact answer to the problem. In my application I use the Reachability code from apple and in my appDelegate I use this: -(BOOL)checkInternet { Reachability *reachability = [Reachability reachabilityWithHostName:@"www.google.com"]; NetworkStatus internetStatus = [reachability currentReachabilityStatus]; BOOL internet; if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN)) { internet = NO; }else { internet = YES; } return internet; } So the problem is even if I have an internet connection, this code telling me that I don't have one. Does anyone know what to do to make this working? Thanks,

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  • iphone download help thanks

    - by Floo
    hi all !  i create an array using :  NSURL *url = [NSURL URLWithString:@"http;//www.myadress.myplist.plist"];f NSArray *tmp = [NSArray arrayWithContentsOfURL:url]; how do i know when the download is complete ?  thanks to all !

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  • iPhone: change height of UITableViewCell coming from a NIB

    - by Stefan Klumpp
    I have a UITableView of custom UITableViewCells which looks like this: [ CELL 0 [ description ] [ dynamic content type 1 ] [ dynamic content type 2 ] [ dynamic content type 3 ] ] [ CELL 1 [ description ] [ dynamic content type 1 ] [ dynamic content type 3 ] ] [ CELL 2 [ description ] [ dynamic content type 2 ] ] [ ... and so on ... ] Since the [description] part is already pretty complex I decided to use Interface Builder to design it and at add the [dynamic content] in the cellForRowAtIndexPath programmatically with [cell addSubview:...]. My problem is now, that I set a default height for my custom UITableViewCell in Interface Builder, but when I add my [dynamic content] (which might range between 0..3) I have different cells with different heights. One thing is of course to calculate the total height and change the return value in heightForRowAtIndexPath, but how do I change the height value of my actual cell (which was loaded from a nib file with a fixed height)?

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  • iPhone: Using a NSMutableArry in the AppDelegate as a Global Variable

    - by aahrens
    What i'm trying to accomplish is to have an NSMutableArray defined in the AppDelegate. I then have two UIViewControllers. One view is responsible for displaying the array from the AppDelegate. The other view is used to add items to the array. So the array starts out to be empty. View1 doesn't display anything because the array is empty. The User goes to View2 and adds an item to the array in AppDelegate. Then when the user goes back to View1 it now displays one item. Here is how I'm trying to accomplish this @interface CalcAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; UITabBarController *tabBarController; NSMutableArray *globalClasses; } @property (nonatomic,retain) NSMutableArray *globalClasses; My other view In the viewDidload I set the array in my View to be the one in the AppDelegate. In an effort to retain values. allCourses = [[NSMutableArray alloc]init]; CalcAppDelegate *appDelegate = (CalcAppDelegate *)[[UIApplication sharedApplication] delegate]; allCourses = appDelegate.globalClasses; Then I would update my allCourses array by adding a new item. Then try to set the array in the AppDelegate to be equal to the modified one. CalcAppDelegate *appDel = (CalcAppDelegate *)[[UIApplication sharedApplication] delegate]; NSLog(@"Size before reset %d",[appDel.globalClasses count]); appDel.globalClasses = allCourses; NSLog(@"Size after reset %d",[appDel.globalClasses count]); What I'm seeing that's returned is 2 in the before, and 2 after. So it doesn't appear to be getting updated properly. Any suggestions?

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