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  • performSelectorInBackground, notify other viewcontroller when done.

    - by Michiel
    Hi, I have a method used to save an image when the user clicks Save. I use performSelectorInBackground to save the image, the viewcontroller is popped and the previous viewcontroller is shown. I want the table (on the previousUIViewController) to reload its data when the imagesaving is done. How can I do this? The save method is called like this: [self performSelectorInBackground:@selector(saveImage) withObject:nil]; [self.navigationController popViewControllerAnimated:YES];

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  • CoreData is saving model without the save: method being called

    - by chris
    I have a list of items with a plus button in the navigation bar that opens up a modal window containing a table of the models attributes, that displays a form when the table items are clicked (pretty standard form style). For some reason if I click the plus button to open the form to create a new model, then immediately click the done button, the person model is saved. The action linked to the done button does nothing but call on a delegate method notifying the personListViewController to close the window. The apple docs do state that the model is not saved after calling the insertNewObjectForEntityName: ... Simply creating a managed object does not cause it to be saved to a persistent store. The managed object context acts as a scratchpad. I am at a lost to why this is happening, but every time I click the done button I have a new blank item in the original tableView. I am using SDK v3.1.3 // PersonListViewController - open modal window - (void)addPerson { // Load the new form PersonNewViewController *newController = [[PersonNewViewController alloc] init]; newController.modalFormDelegate = self; [self presentModalViewController:newController animated:YES]; [newController release]; } // PersonFormViewController - (void)viewDidLoad { [super viewDidLoad]; if ( person == nil ) { MyAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; self.person = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:appDelegate.managedObjectContext]; } ... UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(done)]; self.navigationItem.rightBarButtonItem = doneButton; [doneButton release]; } - (IBAction) done { [self.modalFormDelegate didCancel]; } // delegate method in the original listViewController - (void) didCancel { [self dismissModalViewControllerAnimated:YES]; }

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  • Uniquing with Existing Core Data Entities

    - by warrenm
    I'm using Core Data to store a lot (1000s) of items. A pair of properties on each item are used to determine uniqueness, so when a new item comes in, I compare it against the existing items before inserting it. Since the incoming data is in the form of an RSS feed, there are often many duplicates, and the cost of the uniquing step is O(N^2), which has become significant. Right now, I create a set of existing items before iterating over the list of (possible) new items. My theory is that on the first iteration, all the items will be faulted in, and assuming we aren't pressed for memory, most of those items will remain resident over the course of the iteration. I see my options thusly: Use string comparison for uniquing, iterating over all "new" items and comparing to all existing items (Current approach) Use a predicate to filter the set of existing items against the properties of the "new" items. Use a predicate with Core Data to determine uniqueness of each "new" item (without retrieving the set of existing items). Is option 3 likely to be faster than my current approach? Do you know of a better way?

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  • cellForRowAtIndexPath called too late

    - by Mihai Fonoage
    Hi, I am trying to re-load a table every time some data I get from the web is available. This is what I have: SearchDataViewController: - (void)parseDatatXML { parsingDelegate = [[XMLParsingDelegate alloc] init]; parsingDelegate.searchDataController = self; // CONTAINS THE TABLE THAT NEEDS RE-LOADING; ImplementedSearchViewController *searchController = [[ImplementedSearchViewController alloc] initWithNibName:@"ImplementedSearchView" bundle:nil]; ProjectAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; UINavigationController *nav = (UINavigationController *)[delegate.splitViewController.viewControllers objectAtIndex: 0]; NSArray *viewControllers = [[NSArray alloc] initWithObjects:nav, searchController, nil]; self.splitViewController.viewControllers = viewControllers; [viewControllers release]; // PASS A REFERENCE TO THE PARSING DELEGATE SO THAT IT CAN CALL reloadData on the table parsingDelegate.searchViewController = searchController; [searchController release]; // Build the url request used to fetch data ... NSURLRequest *dataURLRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:dataURL]]; parsingDelegate.feedConnection = [[[NSURLConnection alloc] initWithRequest:dataURLRequest delegate:parsingDelegate] autorelease]; } ImplementedSearchViewController: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSLog(@"count = %d", [keys count]); // keys IS A NSMutableArray return [self.keys count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ... cell.textLabel.text = [keys objectAtIndex:row]; ... } XMLParsingDelgate: -(void) updateSearchTable:(NSArray *)array { ... [self.currentParseBatch addObject:(NSString *)[array objectAtIndex:1]]; // RELOAD TABLE [self.searchViewController.table reloadData]; } - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { if ([elementName isEqualToString:@"..."]) { self.currentParseBatch = [NSMutableArray array]; searchViewController.keys = self.currentParseBatch; ... } ... } - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName isEqualToString:@"..."]) { ... [self performSelectorOnMainThread:@selector(updateSearchTable:) withObject:array waitUntilDone:NO]; } ... } My problem is that when I debug, the calls go between reloadData and numberOfRowsInSection until the keys array is filled with the last data, time at which the cellForRowAtIndexPath gets called. I wanted the table to be updated for each element I send, one by one, instead of just in the end. Any ideas why this behavior? Thank you!

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  • Custom UIButton Memory Management in dealloc

    - by ddawber
    I am hoping to clarify the processes going on here. I have created a subclass of UIButton whose init method looks like this: - (id)initWithTitle:(NSString *)title frame:(CGRect)btnFrame { self = [UIButton buttonWithType:UIButtonTypeCustom]; [self setTitle:title forState:UIControlStateNormal]; self.frame = btnFrame; return self; } In my view controller I am creating one of these buttons and adding it as a subview: myButton = [[CustomButton alloc] initWithTitle:@"Title" frame:someFrame]; [self.view addSubview:myButton]; In the view controller's dealloc method I log the retain count of my button: - (void)dealloc { NSLog(@"RC: %d", [myButton retainCount]); //RC = 2 [super dealloc]; NSLog(@"RC: %d", [myButton retainCount]); //RC = 1 } The way I understand it, myButton is not actually retained, even though I invoked it using alloc, because in my subclass I created an autorelease button (using buttonWithType:). In dealloc, does this mean that, when dealloc is called the superview releases the button and its retain count goes down to 1? The button has not yet been autoreleased? Or do I need to get that retain count down to zero after calling [super dealloc]? Cheers.

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  • How to intercept touch events globally?

    - by mystify
    I have an view which is sometimes covered by some other views. However, if the user slides the finger across the screen, I want to slide that underlying view across the screen, too. I could start making custom views for all those covering subviews and forward all kinds of touch events, but that's somewhat cumbersome. Maybe there's some kind of notification or another way that a UIView or UIControl subclass can be aware of touch events happening right now, no matter where they are. In short: I need an UIView subclass or UIControl subclass which knows about any touch events happening on the entire screen. Or at least if tht's not possible, knowing about any touch events happening above itself in the same underlying superview. Another description: There are 20 views, all reside inside the same superview. The first view is covered by 19 others. But if the user slides across the screen, that first view must slide too, so it must be aware of touch events. Is there any better solution that making all 19 views forward touch events? (yes, all 19 views respond to touch events in this example)

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  • UIAcceleration filtering

    - by Ilya
    Hi, I found the following piece of code in apple guidelines: - (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration { //Use a basic low-pass filter to only keep the gravity in the accelerometer values accel[0] = acceleration.x * kFilteringFactor + accel[0] * (1.0 - kFilteringFactor); accel[1] = acceleration.y * kFilteringFactor + accel[1] * (1.0 - kFilteringFactor); accel[2] = acceleration.z * kFilteringFactor + accel[2] * (1.0 - kFilteringFactor); } What does it exactly do? What is this low-pass filter? Why do I have to apply it? Thank you in advance.

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  • Animation of UINavigationController's UIToolbar

    - by Michael Waterfall
    When presenting a view controller that has toolbar items, is it possible for the toolbar to slide in with the view controller (i.e. slide in from the right) as opposed to it sliding from the bottom? In the view controller that is being presented, I've got the toolbar being shown within the -viewWillAppear: method, but the toolbar is being slid up from the bottom of the screen as opposed to it looking like it belongs to the view controller. - (void)viewWillAppear:(BOOL)animated { [self.navigationController setToolbarHidden:NO animated:YES]; ... }

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  • Textures loaded with NSOperation are blank

    - by Omega
    So I call this method: -(void)beginExecution { NSOperationQueue *queue = [NSOperationQueue new]; NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(execute) object:nil]; [queue addOperation:operation]; [operation release]; } Which triggers this: -(void)execute { [[CCSpriteFrameCache sharedSpriteFrameCache]addSpriteFramesWithFile:@"MyTexture.plist"]; loaded = YES; // This tells me whenever loading is done. } However, when I create a sprite and try to use the texture MyTexture.png, the sprite is a blank canvas. Why is that?

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  • Building a NSPredicate for a filter

    - by John
    Hi, Just wondering what the best way to build a NSPredicate is if some filters are optional? This is basically for a filter, so if some options aren't selected I don't to filter by them eg. If I have option1 and option2 set for the filter. NSPredicate* predicate = [NSPredicate predicateWithFormat:@"option1 = %@ AND option2 = %@] .... otherwise if just option1 NSPredicate* predicate = [NSPredicate predicateWithFormat:@"option1 = %@] .... The key being there are 10 different options to filter, so I don't want to have to code for the 10x10 possible combinations. Thanks

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  • Custom nib UITableViewCell height

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

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  • Paging a UIScrollView with a large PDF

    - by Fousa
    I try to create a simple UIScrollView with paging. And I want to be able to scroll through a large PDF document, but this gives me some problems... I tried the following options: Convert all the PDF pages to UIImages at startup, this works, but is very slow on start Manually drawing the PDF page in the drawRect, but yet again this was slow... And I prefer not to load everything at startup but to do it during the usage. Did anyone did this recently? Can't seem to find a nice example project. Thnx! Jelle

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  • How can we set time delay in animation of images to make them appear smooth ?

    - by srikanth rongali
    Hi, I have 10 CCSprite images. They are continues images. I am using, CCSprite *playerH = [CCSprite spriteWithFile:@"Player_01.png" ]; playerH.position = ccp(playerH.contentSize.width/2, windowSize.height/2); [self addChild:playerH z:1]; CCAnimation* animation = [CCAnimation animationWithName:@"dance" delay:0.20f]; for( int i = 1; i < 11; i++ ) { [animation addFrameWithFilename: [NSString stringWithFormat:@"Player_%02d.png", i]]; } NSLog(@"k VALUE: k: %d",k); id actionA = [CCAnimate actionWithAnimation: animation restoreOriginalFrame:NO]; id actionD = [CCDelayTime actionWithDuration:5.0f]; id actionC = [CCCallFunc actionWithTarget:self selector:@selector(enemyEntranceScreen:)]; id seqActionPlayer = [CCSequence actions:actionA, actionD, actionC, nil]; [playerH runAction: seqActionPlayer]; But the animation is not continues. I have changed the animation delay time. but, I can see only three images appearing. How can we know how much time interval should we keep in animation. Is there any relationship between this and the frame rate [[CCDirector sharedDirector] setAnimationInterval:1.0/60]; [[CCDirector sharedDirector] setDisplayFPS:YES]; Thank you.

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  • Animate screen while loading textures

    - by Omega
    My RPG-like game has random battles. When the player enters a random battle, it is necessary for my game to load the textures used within that battle (animated monsters, animations, etc). The textures are quite a lot, and rather big (the battles are very graphical intensive). Such process consumes significant time. And while it is loading, the whole screen freezes. The game's map freezes, and the wait time is significant - I personally find it annoying. I can't afford to preload the textures because, after doing some math, I realized: If I preload all the textures at the beginning of the game, the application will definitely crash. If I preload the textures that are used in a specific map when the player enters the map, the application is very likely to crash as well. I can only afford to load the textures when I need them, and dispose of them as soon as the battle ends. I'd prefer to not use a "loading screen" image because it affects my game's design and concept. I want to avoid this approach. If I could do some kind of animation while loading the textures, it would be great, which leads to my question: is that possible? What kind of animation, you ask? Well, how about... you remember when Final Fantasy used to distort the screen while apparently loading the textures? Something like that. But well, distorting is quite a time-consuming process as well, so maybe just a cool frame-by-frame animation or something. While writing this, I realized that I could make small pauses between textures (there are multiple textures), and during such pauses, I update the screen to represent the animation's state. However, this is very unlikely to happen, because each texture is 2048x2048, so the animation would be refreshed at a rather laggy (and annoying) rate. I'd prefer to avoid this as well.

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  • How to use a method with more than one parameters to create custom buttons

    - by iphonix
    I am repeating my codes few times to create custom buttons, I am trying to create a method and create all my required buttons just by called that method and using two parameters, btnTitle and btnAction. My Codes for the method -(void) addnewButton:(NSString *) btnTitle withAction:UIAction btnAction; { // Add a custom edit navigation button editButton = [[[UIBarButtonItem alloc] initWithTitle:NSLocalizedString((btnTitle), @"") style:UIBarButtonItemStyleBordered target:self action:@selector(btnAction)] autorelease]; self.navigationItem.rightBarButtonItem = editButton; } Now how shall I call this method to create a button?

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  • Core Data Change property value when another property changes

    - by user320587
    Hi, I have a Core Data Entity which has three properties startDate, endDate and duration. All three properties are persistent properties. I would like to know how I can calculate and update the duration property whenever the value for startDate and endDate changes? BTW, I won't be able to make the duration as transient property since I have to use the property for sorting in my table view? Any help is greatly appreciated Thanks, Javid

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  • NSDateFormatter Does not convert correctly

    - by deamonsarea
    Hi, I have a NSString which is passed from an xml feed........ NSString *strDate =@"Thu, 22 Apr 2010 10.30 am CEST"; I'm currently using this code to format the date........ NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"EEE, dd MMM yyyy hh:mm a vvvv"]; NSDate *myDate = [dateFormatter dateFromString:date]; [dateFormatter setDateFormat:@"HH"]; NSLog(@"%@", [dateFormatter stringFromDate:myDate]); I want to format my string only to display only hours and currently I'm getting value like this. strDate =@"2010-04-10 14:00:00 +0530"; Can anyone please help me with this?......

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  • Performselector not call in NSThread

    - by abdulsamad
    Hi all, I have a problem that i want to call a function when one of my functions that is running into a seperate thread comes to an end. its like that [NSThread detachNewThreadSelector:@selector(fetchFeaturedFreeApps) toTarget:self withObject:nil]; here is my fetchFeaturedFreeApps function -(void)fetchFeaturedFreeApps { ////all my code [self performSelector:@selector(closeView) withObject:nil afterDelay:4.0]; } My problem is that the close view methods doesnt run after the 4 seconds. Hoew if i call the fetchFeaturedFreeApps method with perform selector then my closeview metod is called properly. Your valuable help is highly appreciated.

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  • Displaying menus on image

    - by Snehal
    Hi all, Here is what i am doing: I have a viewcontroller screen1 to which I have added long press gesture. On longPress, user will get draw menu. On selecting that menu, i am creating another uiviewcontroller class object which has a rectangle image. This instance i am adding as a subview to screen1. Now what i want is that once the image is displayed on the screen1, i want to display UImenuItems Done and cancel above the image drawn so that on tapping on done menu, the image is saved. I tried making the new viewcontroller as firstResponder after adding image to screen1 but the menus are not visible. Any one please help

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  • Mapkit +closest annotation

    - by danskcollignon
    Hi all, I am trying to devellopp an app showing the nearest poi to the users location. My app is now capable of: showing a map (Mapkit) with 110 annotations and the user's location. Furthermore, I have a TableView at the bottom of my screen, to choose between the different annotations. However, they're listed by number, and not by proximity to the user's location, which is my wish. My research have led me to think that I should use CLLocation for getting the user's location. I then have really no idea on how to do it next, using getDistancefrom. My annotations are stored on SecondViewController.m, using this form: -(void)loadOurAnnotations { CLLocationCoordinate2D workingCoordinate; workingCoordinate.latitude = XX.XXXXX; workingCoordinate.longitude = XX.XXXXX; SecondViewAnnotation *POI1 = [[SecondViewAnnotation alloc] initWithCoordinate:workingCoordinate]; [POI1 setTitle:@"POI"]; [POI1 setSubtitle:@"StreetName"]; [POI1 setAnnotationType:SecondViewAnnotationTypePOI1]; [mapView addAnnotation:POI1]; , and so on to POI110. Could someone please give me a clue? I'm a total newbie! Thank you in advance for your help,

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