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  • Reason why UIImageView gives me a 'distorted' image sometimes

    - by Cedric Vandendriessche
    I have a custom UIView with a UILabel and a UIImageView subview. (tried using UIImageView subclass aswell). I assign an image to it and add the view to the screen. I wrote a function which adds the amount of LetterBoxes to the screen as there are letters in the word: - (void)drawBoxesForWord:(NSString *)word { if(boxesContainer == nil) { /* Create a container for the LetterBoxes (animation purposes) */ boxesContainer = [[UIView alloc] initWithFrame:CGRectMake(0, 205, 320, 50)]; [self.view addSubview:boxesContainer]; } /* Calculate width of letterboxes */ NSInteger numberOfCharacters = [word length]; CGFloat totalWidth = numberOfCharacters * 28 + (numberOfCharacters - 1) * 3; CGFloat leftCap = (320 - totalWidth) / 2; [letters removeAllObjects]; /* Draw the boxes to the screen */ for (int i = 0; i < numberOfCharacters; i++) { LetterBox *letter = [[LetterBox alloc] initWithFrame:CGRectMake(leftCap + i * 31 , 0, 28, 40)]; [letters addObject:letter]; [boxesContainer addSubview:letter]; [letter release]; }} This gives me the image below: http://www.imgdumper.nl/uploads2/4ba3b2c72bb99/4ba3b2c72abfd-Goed.png But sometimes it gives me this: imgdumper.nl/uploads2/4ba3b2d888226/4ba3b2d88728a-Fout.png I add them to the same boxesContainer but they first remove themselves from the superview, so it's not like you see them double or something. What I find weird is that they are all good or all bad.. This is the init function for my LetterBox: if (self == [super initWithFrame:aRect]) { /* Create the box image with same frame */ boxImage = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)]; boxImage.contentMode = UIViewContentModeScaleAspectFit; boxImage.image = [UIImage imageNamed:@"SpaceOpen.png"]; [self addSubview:boxImage]; /* Create the label with same frame */ letterLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height)]; letterLabel.backgroundColor = [UIColor clearColor]; letterLabel.font = [UIFont fontWithName:@"ArialRoundedMTBold" size:26]; letterLabel.textColor = [UIColor blackColor]; letterLabel.textAlignment = UITextAlignmentCenter; [self addSubview:letterLabel]; } return self;} Does anyone have an idea why this could be? I'd rather have them display correctly every time :)

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  • How does a custom accessor method implementation in Core Data look like?

    - by dontWatchMyProfile
    The documentation is pretty confusing on this one: The implementation of accessor methods you write for subclasses of NSManagedObject is typically different from those you write for other classes. If you do not provide custom instance variables, you retrieve property values from and save values into the internal store using primitive accessor methods. You must ensure that you invoke the relevant access and change notification methods (willAccessValueForKey:, didAccessValueForKey:, willChangeValueForKey:, didChangeValueForKey:, willChangeValueForKey:withSetMutation:usingObjects:, and didChangeValueForKey:withSetMutation:usingObjects:). NSManagedObject disables automatic key-value observing (KVO, see Key-Value Observing Programming Guide) change notifications, and the primitive accessor methods do not invoke the access and change notification methods. In accessor methods for properties that are not defined in the entity model, you can either enable automatic change notifications or invoke the appropriate change notification methods. Are there any examples that show how these look like?

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  • Using Core Data Concurrently and Reliably

    - by John Topley
    I'm building my first iOS app, which in theory should be pretty straightforward but I'm having difficulty making it sufficiently bulletproof for me to feel confident submitting it to the App Store. Briefly, the main screen has a table view, upon selecting a row it segues to another table view that displays information relevant for the selected row in a master-detail fashion. The underlying data is retrieved as JSON data from a web service once a day and then cached in a Core Data store. The data previous to that day is deleted to stop the SQLite database file from growing indefinitely. All data persistence operations are performed using Core Data, with an NSFetchedResultsController underpinning the detail table view. The problem I am seeing is that if you switch quickly between the master and detail screens several times whilst fresh data is being retrieved, parsed and saved, the app freezes or crashes completely. There seems to be some sort of race condition, maybe due to Core Data importing data in the background whilst the main thread is trying to perform a fetch, but I'm speculating. I've had trouble capturing any meaningful crash information, usually it's a SIGSEGV deep in the Core Data stack. The table below shows the actual order of events that happen when the detail table view controller is loaded: Main Thread Background Thread viewDidLoad Get JSON data (using AFNetworking) Create child NSManagedObjectContext (MOC) Parse JSON data Insert managed objects in child MOC Save child MOC Post import completion notification Receive import completion notification Save parent MOC Perform fetch and reload table view Delete old managed objects in child MOC Save child MOC Post deletion completion notification Receive deletion completion notification Save parent MOC Once the AFNetworking completion block is triggered when the JSON data has arrived, a nested NSManagedObjectContext is created and passed to an "importer" object that parses the JSON data and saves the objects to the Core Data store. The importer executes using the new performBlock method introduced in iOS 5: NSManagedObjectContext *child = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType]; [child setParentContext:self.managedObjectContext]; [child performBlock:^{ // Create importer instance, passing it the child MOC... }]; The importer object observes its own MOC's NSManagedObjectContextDidSaveNotification and then posts its own notification which is observed by the detail table view controller. When this notification is posted the table view controller performs a save on its own (parent) MOC. I use the same basic pattern with a "deleter" object for deleting the old data after the new data for the day has been imported. This occurs asynchronously after the new data has been fetched by the fetched results controller and the detail table view has been reloaded. One thing I am not doing is observing any merge notifications or locking any of the managed object contexts or the persistent store coordinator. Is this something I should be doing? I'm a bit unsure how to architect this all correctly so would appreciate any advice.

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  • Sort NSFetchedResultsController results by user location

    - by cgp
    I have an application that contains some Locations in Core Data, and I want to show them to the user in order of proximity to the user's location. I am using an NSFetchedResultsController to serve the locations to the Table View. I thought about creating a virtual accessor method that returns the location's distance from the user, that would be calculated using a "global" CoreLocationManager, but it crashes with reason: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath distanceFromCurrentLocation not found in entity < NSSQLEntity Location id=4' I also give the user the option to sort alphabetically, so I would prefer it if I kept the NSFetchedResultsController, if possible. How should I do it? Thanks!

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  • Link to pdf within app

    - by Thijs
    I've got an iOS app that at one point opens a link to a website in a webview. These links are kept in a plist file (so it is easy to maintain them as the app evolves). What I want to do next is to also link to PDF's (or any picture of text file format, of even a html format, this is flexible) that are kept within the app. And I would like to do this as much as possible from within the existing app structure. So, is it possible to create a link that can be put in the plist as a web-link, but instead opens a file on the device itself (possibly in the webview)? And how would I go about that? Any ideas? Thanx in advance for your help!

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  • release vs setting-to-nil to free memory

    - by Dan Ray
    In my root view controller, in my didReceiveMemoryWarning method, I go through a couple data structures (which I keep in a global singleton called DataManager), and ditch the heaviest things I've got--one or maybe two images associated with possibly twenty or thirty or more data records. Right now I'm going through and setting those to nil. I'm also setting myself a boolean flag so that various view controllers that need this data can easily know to reload. Thusly: DataManager *data = [DataManager sharedDataManager]; for (Event *event in data.eventList) { event.image = nil; event.thumbnail = nil; } for (WondrMark *mark in data.wondrMarks) { mark.image = nil; } [DataManager sharedDataManager].cleanedMemory = YES; Today I'm thinking, though... and I'm not actually sure all that allocated memory is really being freed when I do that. Should I instead release those images and maybe hit them with a new alloc and init when I need them again later?

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  • In App Purchase no valid Product IDs

    - by david
    I'm trying to get In App Purchase with my existing iPad App working. I'm stuck retrieving the Product Information from App Store: - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response The SKProductsResponse only contains invalid Product IDs. I tried every potential solution I found here or on the net: my App ID has In App enabled I generated a new provisioning profile and installed it on my device I restarted the device my App ID is the same as in my Info.plist (it's in the Store since weeks) I added In App Purchases for the App with "cleared for sale" checked I added Screenshots to my In App Purchases I tried different naming schemes for the Product ID I made triple checked that I pass the correct Product ID to the SKProductsRequest I'm passing a NSSet to the SKProductsRequest instead of a MutableSet I updated my App with the upcoming version containing in App purchase and submitted it for Review I approved one of my In App Purchases, just to see if that helps I waited more than 24 hours All of these actions brought me nothing but invalid Product IDs. I hope someone can point me into the right direction, because I'm running out of ideas.

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  • iOS 5 - Coredata Sqlite DB losing data after killing app

    - by Brian Boyle
    I'm using coredata with a sqlite DB to persist data in my app. However, each time I kill my app I lose any data that was saved in the DB. I'm pretty sure its because the .sqlite file for my DB is just being replaced by a fresh one each time my app starts, but I can't seem to find any code that will just use the existing one thats there. It would be great if anyone could point me towards some code that could handle this for me. Cheers B - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (__persistentStoreCoordinator != nil) { return __persistentStoreCoordinator; } NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"FlickrCoreData.sqlite"]; NSError *error = nil; __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return __persistentStoreCoordinator; }

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  • is it possible to adjust position x,y titleLabel of UIButton ?

    - by RAGOpoR
    here is my code UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [btn setFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)]; [btn setTitle:[NSString stringWithFormat:@"Button %d", i+1] forState:UIControlStateNormal]; [btn addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside]; btn.titleLabel.frame = ???

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  • Navigation and Tab Bar both are in app, which model to follow?

    - by iPhoneDev
    Which model should I use, if my First view in Login view (NO Tab required) and then all other views are under Tab Bar. So as a rule should I create Navigation based template coz First view uses only Navigation not Tab Bar or is there any other way around? Please suggest First Screen with Nav bar in Top (MUST Needed) Second Screen Tab Bar view:

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  • When to release the UIImage ?

    - by ragnarius
    I use the following code to draw a subimage UIImage* subIm = getSubImage( large, rect ); [subIm drawInRect:self.bounds]; where getSubImage is defined as follows UIImage* getSubImage(UIImage* uim, CGRect rc){ CGImageRef imref = CGImageCreateWithImageInRect(uim.CGImage, rc); UIImage* sub = [UIImage imageWithCGImage:imref]; CGImageRelease(imref); NSLog(@"subimage retainCount=%d", [sub retainCount]); // is 1 return sub; }//getSubImage Is the code correct? Is it safe to "CGImageRelease" imref? Has sub "CGImageRetained" imref? Should I release subIm (I get an error if I do)? Is subIm contained in the autorelease-pool, and , if so, how do I know this? In general, can one check if an object is contained in the autorelease pool (for debugging purpose)?

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  • iOS: How to access the `UIKeyboard`?

    - by MattDiPasquale
    I want to get a pointer reference to UIKeyboard *keyboard to the keyboard on screen so that I can add a transparent subview to it, covering it completely, to achieve the effect of disabling the UIKeyboard without hiding it. In doing this, can I assume that there's only one UIKeyboard on the screen at a time? I.e., is it a singleton? Where's the method [UIKeyboard sharedInstance]. Brownie points if you implement that method via a category. Or, even more brownie points if you convince me why it's a bad idea to assume only one keyboard and give me a better solution.

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  • Events do not propagate from a child element?

    - by Legend
    I was playing around with the Swipe jQuery plugin on my iPod Touch and Android devices. The following works: <html> <head> <script type="text/javascript" src="lib/jquery/jquery-1.3.2.js"></script> <script type="text/javascript" src="lib/plugins/jquery.swipe.js"></script> <script type="text/javascript"> $(function() { $('body').swipe({ swipeLeft: function() { $('#container1').append("Swiped Left!"); }, swipeRight: function() { $('#container2').append("Swiped Right!");} }); }); </script> <style type="text/javascript"> body {width: 300px; height: 300px; background: #000;} </style> </head> <body> <div id="container1"> This is container one </div> <div id="container2"> This is container two </div> </body> </html> But if I have something like this: <html> <head> <script type="text/javascript" src="lib/jquery/jquery-1.3.2.js"></script> <script type="text/javascript" src="lib/plugins/jquery.swipe.js"></script> <script type="text/javascript"> $(function() { $('#wrapper').swipe({ swipeLeft: function() { $('#container1').append("Swiped Left!"); }, swipeRight: function() { $('#container2').append("Swiped Right!");} }); }); </script> <style type="text/javascript"> body {width: 300px; height: 300px; background: #000;} </style> </head> <body> <div id="wrapper"> <div id="container1"> This is container one </div> <div id="container2"> This is container two </div> </div> </body> </html> Notice the "wrapper" div around the containers. Now, when I swipe on the div element, I was expecting it to actually trigger the event. This works in iPod touch as expected but does not work on my Android device unless I randomly start swiping everywhere until I happen to swipe on that small wrapper div element itself. I am not sure how to explain this but hink of it as sending events to the wrapper div itself. Both use the WebKit engine. Can someone tell me if I am doing something wrong?

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  • How to increment a value using a C-Preprocessor in Objective-C?

    - by mystify
    Example: I try to do this: static NSInteger stepNum = 1; #define METHODNAME(i) -(void)step##i #define STEP METHODNAME(stepNum++) @implementation Test STEP { // do stuff... [self nextFrame:@selector(step2) afterDelay:1]; } STEP { // do stuff... [self nextFrame:@selector(step3) afterDelay:1]; } STEP { // do stuff... [self nextFrame:@selector(step4) afterDelay:1]; } // ... When building, Xcode complains that it can't increment stepNum. This seems logical to me, because at this time the code is not "alive" and this pre-processing substitution stuff happens before actually compiling the source code. Is there another way I could have an variable be incremented on every usage of STEP macro, the easy way?

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  • Get unique artist names from MPMediaQuery

    - by Akash Malhotra
    I am using MPMediaQuery to get all artists from library. Its returning unique names I guess but the problem is I have artists in my library like "Alice In Chains" and "Alice In Chains ". The second "Alice In Chains" has some white spaces at the end, so it returns both. I dont want that. Heres the code... MPMediaQuery *query=[MPMediaQuery artistsQuery]; NSArray *artists=[query collections]; artistNames=[[NSMutableArray alloc]init]; for(MPMediaItemCollection *collection in artists) { MPMediaItem *item=[collection representativeItem]; [artistNames addObject:[item valueForProperty:MPMediaItemPropertyArtist]]; } uniqueNames=[[NSMutableArray alloc]init]; for(id object in artistNames) { if(![uniqueNames containsObject:object]) { [uniqueNames addObject:object]; } } Any ideas?

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  • Problem with NSMutableArray

    - by zp26
    Hi, I have a problem with NSMutableArray. In my program i have a lot of variabile "CFSocketRef". i want to save this in NSMutableArray but i can't. Can you help me? Thank and sorry for my english XP My code: CFSocketRef socketAccept; NSMutableArray *arrayIP = [[NSMutableArray alloc] init]; self.socketAccept = CFSocketCreateWithNative(NULL, fd, kCFSocketDataCallBack, AcceptDataCallback, &context); [arrayIP addObject:(id)self.socketAccept];

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  • Object leak using "retain"

    - by Abhinav
    I have a property defined with retain attribute which I am synthesizing: @property (nonatomic, retain) UISwitch *mySwitch; And inside my loadView I am doing this: self.mySwitch = [[UISwitch alloc] initWithFrame:CGRectMake(0, 0, 40, 20)]; And finally inside my dealloc I am doing this: self.mySwitch = nil; Am I leaking this object (mySwitch) as I have used one alloc? Should I autorelease it while assigning it frame? Please suggest.

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  • My xcode mapview wont work when combined with webview

    - by user1715702
    I have a small problem with my mapview. When combining the mapview code with the code for webview, the app does not zoom in on my position correctly (just gives me a world overview where i´m supposed to be somewhere in California - wish I was). And it doesn´t show the pin that I have placed on a specific location. These things works perfectly fine, as long as the code does not contain anything concerning webview. Below you´ll find the code. If someone can help me to solve this, I would be som thankful! ViewController.h #import <UIKit/UIKit.h> #import <MapKit/MapKit.h> #define METERS_PER_MILE 1609.344 @interface ViewController : UIViewController <MKMapViewDelegate>{ BOOL _doneInitialZoom; IBOutlet UIWebView *webView; } @property (weak, nonatomic) IBOutlet MKMapView *_mapView; @property (nonatomic, retain) UIWebView *webView; @end ViewController.m #import "ViewController.h" #import "NewClass.h" @interface ViewController () @end @implementation ViewController @synthesize _mapView; @synthesize webView; - (void)viewDidLoad { [super viewDidLoad]; [_mapView setMapType:MKMapTypeStandard]; [_mapView setZoomEnabled:YES]; [_mapView setScrollEnabled:YES]; MKCoordinateRegion region = { {0.0,0.0} , {0.0,0.0} }; region.center.latitude = 61.097557; region.center.longitude = 12.126545; region.span.latitudeDelta = 0.01f; region.span.longitudeDelta = 0.01f; [_mapView setRegion:region animated:YES]; newClass *ann = [[newClass alloc] init]; ann.title = @"Hjem"; ann.subtitle = @"Her bor jeg"; ann.coordinate = region.center; [_mapView addAnnotation:ann]; NSString *urlAddress = @"http://google.no"; //Create a URL object. NSURL *url = [NSURL URLWithString:urlAddress]; //URL Requst Object NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; //Load the request in the UIWebView. [webView loadRequest:requestObj]; } - (void)viewDidUnload { [self setWebView:nil]; [self set_mapView:nil]; [super viewDidUnload]; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } - (void)viewWillAppear:(BOOL)animated { // 1 CLLocationCoordinate2D zoomLocation; zoomLocation.latitude = 61.097557; zoomLocation.longitude = 12.126545; // 2 MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 0.5*METERS_PER_MILE, 0.5*METERS_PER_MILE); // 3 MKCoordinateRegion adjustedRegion = [_mapView regionThatFits:viewRegion]; // 4 [_mapView setRegion:adjustedRegion animated:YES]; } @end NewClass.h #import <UIKit/UIKit.h> #import <MapKit/MKAnnotation.h> @interface newClass : NSObject{ CLLocationCoordinate2D coordinate; NSString *title; NSString *subtitle; } @property (nonatomic, assign) CLLocationCoordinate2D coordinate; @property (nonatomic, copy) NSString *title; @property (nonatomic, copy) NSString *subtitle; @end NewClass.m #import "NewClass.h" @implementation newClass @synthesize coordinate, title, subtitle; @end

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  • How to use UISwipeGestureRecognizer on UIButton?

    - by Ashutosh
    I have a UIbutton which i want to work as a joystick. So i am trying to add some gesture recognizer on the same button. I have this in my code right now: UISwipeGestureRecognizer *recognizer; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)]; [self.gestureRecieverButton addGestureRecognizer:recognizer]; [recognizer release]; recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; [recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)]; [self.gestureRecieverButton addGestureRecognizer:recognizer]; [recognizer release]; -(void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer { NSLog(@"Swipe received.%@",recognizer); } This is the error i am getting now: -[CUETutorialSixteenClusterRootController handleSwipeFrom:]: unrecognized selector sent to instance 0x79b71b0 2012-03-28 13:25:55.724 CUETrainer[1788:11f03] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CUETutorialSixteenClusterRootController handleSwipeFrom:]: unrecognized selector sent to instance 0x79b71b0' But its not actually doing anything. Please help!!!!

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