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  • Memory problem with basic UITableView when scrolling

    - by Sheehan Alam
    I have a very simple UITableView that has 3 sections, and 3 rows per section. #pragma mark - #pragma mark UITableView delegate methods - (NSInteger)tableView:(UITableView *)tblView numberOfRowsInSection:(NSInteger)section { return 3; } - (UITableViewCell *)tableView:(UITableView *)tblView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tblView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell... return cell; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tblView { if (tblView == self.tableView) { return 3; } else { return 1; } } Everything shows up fine, but as soon as I scroll my application crashes and my debugger tells me: * -[ProfileViewController tableView:cellForRowAtIndexPath:]: message sent to deallocated instance 0x5ae61b0 I'm not exactly sure what I am doing wrong.

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  • Drawing in iPad

    - by Manjunath
    Hi all, I am trying to draw custom shapes in iPad application. I am using UIBezierPath for drawing which is available for 3.2 onwards. My question is whether it is good to use this class or should I go to the core graphics? Is there any difference between uibezierpath and core graphics drawing related to performance?

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  • UITextField with the lookup

    - by leon
    Hello, I would like to achive the same functinoanlity in the UUTextField control as Google search web site (which uses Ajax for this): as user start typing, list of suggestion searches is shown. Then more letteres you type, suggestion list changes. So imaging I have array of words: Apple Abc Aman As user types A, all thress suggesions are shown, if user type one more letter p, then Apple is suggested. How would I do something like this? Mail type of applicatins do it, when receipent name is typed in the To: edit control I guess I can use UITableView with the search, is it correct approach?

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  • cancel an ASIHTTPRequest thread

    - by user262325
    Hello evryone I have some codes to use ASINetworkQueue as multi thread download ASINetworkQueue *networkQueue; NSURL *url = [NSURL URLWithString:s]; ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; [networkQueue addOperation:request]; [networkQueue go]; if I try to use the code below to cancel the thread with index k [[[networkQueue operations] objectAtIndex:k] cancel]; I notice all requests in ASINetworkQueue were cancelled and stop working. Welcome any comment Thanks interdev

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  • How to push this view controller ?

    - by hib
    Hello all, I am caught in a strange requirement .See the following view hierarchy and scenario . I have a tab bar application in which I have three tabs . In first tab I am showing some content with a small image title and date (uitableview in navigation controller). In the detail view of that controller there are more buttons that shows different sorts of detail like gallery button and , more details button and some , more button . On tapping each button I will push each individual view controller in the main navigation controller . Now on the horizontal orientation I am showing same list of content but in the cover flow ( in modal view controller ) fashion like the ipod application . On tapping any image we will show the same buttons like gallery and more details and tapping on it will show the new controller with the following code : UINavigationController *modalNavController = [[UINavigationController alloc] initWithRootViewController:myPhotoController]; UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(backButtonPressed)]; myPhotoController.navigationItem.leftBarButtonItem = backButton; [backButton release]; if([self.modalViewController isViewLoaded]){ [self dismissModalViewControllerAnimated:YES]; } modalNavController.navigationBar.barStyle = UIBarStyleBlackOpaque; [self presentModalViewController:modalNavController animated:YES]; [modalNavController release]; All this is working nicely . but when I get back the device in vertical orientation . the main modal controller will be dismissed and all the containing modal controller also will be dismissed if they are open or not . Instead of this what I want is If chooses an item in the coverflow and then if chooses gallery and if I put the device in vertical orientaion the gallery should be in the navigation hierarchy that drove me to the main list and gallery should be in horizonatal fashion . So what I want to do is that just to push the gallery controller in the main navigation hierarchy instead of showing from a madal controller . If someone wants reference then see the application "net a porter" I want to do like that . Just tell me how the controller hierarchy is working in that app . I need the help . Thanks

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  • When using delegates, need better way to do sequential processing

    - by Padawan
    I have a class WebServiceCaller that uses NSURLConnection to make asynchronous calls to a web service. The class provides a delegate property and when the web service call is done, it calls a method webServiceDoneWithXXX on the delegate. There are several web service methods that can be called, two of which are say GetSummary and GetList. The classes that use WebServiceCaller initially need both the summary and list so they are written like this: -(void)getAllData { [webServiceCaller getSummary]; } -(void)webServiceDoneWithGetSummary { [webServiceCaller getList]; } -(void)webServiceDoneWithGetList { ... } This works but there are at least two problems: The calls are split across delegate methods so it's hard to see the sequence at a glance but more important it's hard to control or modify the sequence. Sometimes I want to call just GetSummary and not also GetList so I would then have to use an ugly class-level state variable that tells webServiceDoneWithGetSummary whether to call GetList or not. Assume that GetList cannot be done until GetSummary completes and returns some data which is used as input to GetList. Is there a better way to handle this and still get asynchronous calls? Update based on Matt Long's answer: Using notifications instead of a delegate, it looks like I can solve problem #2 by setting a different selector depending on whether I want the full sequence (GetSummary+GetList) or just GetSummary. Both observers would still use the same notification name when calling GetSummary. I would have to write two separate methods to handle GetSummaryDone instead of using a single delegate method (where I would have needed some class-level variable to tell whether to then call GetList). -(void)getAllData { [[NSNotificationCenter defaultCenter] addObserver:self              selector:@selector(getSummaryDoneAndCallGetList:)                  name:kGetSummaryDidFinish object:nil];     [webServiceCaller getSummary]; } -(void)getSummaryDoneAndCallGetList { [NSNotificationCenter removeObserver] //process summary data [[NSNotificationCenter defaultCenter] addObserver:self              selector:@selector(getListDone:)                  name:kGetListDidFinish object:nil];     [webServiceCaller getList]; } -(void)getListDone { [NSNotificationCenter removeObserver] //process list data } -(void)getJustSummaryData { [[NSNotificationCenter defaultCenter] addObserver:self              selector:@selector(getJustSummaryDone:) //different selector but                  name:kGetSummaryDidFinish object:nil]; //same notification name     [webServiceCaller getSummary]; } -(void)getJustSummaryDone { [NSNotificationCenter removeObserver] //process summary data } I haven't actually tried this yet. It seems better than having state variables and if-then statements but you have to write more methods. I still don't see a solution for problem 1.

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  • UIAlertView crashing on undocumented method

    - by morticae
    Our app has been crashing with a frequency of roughly 1 in 1,500 launches due to a bug that is proving elusive. The relevant portion of the stack trace is included. It's being fired as a callback so I have no reference for where it's occurring in my own code. It looks like what's going on is there is a UIViewAnimationState object that is calling UIAlertView's private method (_popoutAnimationDidStop:finished:). Only problem is, it appears the UIAlertView has been dealloced by this point. I don't do anything weird with alert views. I throw them up, and I wait for user input. They are all shown before being released. Anyone encountered this? At this point, I'm leaning toward it being an Apple bug. Thread 0 Crashed: 0 libobjc.A.dylib 0x3138cec0 objc_msgSend + 24 1 UIKit 0x326258c4 -[UIAlertView(Private) _popoutAnimationDidStop:finished:] 2 UIKit 0x324fad70 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] 3 UIKit 0x324fac08 -[UIViewAnimationState animationDidStop:finished:] 4 QuartzCore 0x311db05c run_animation_cal lbacks

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  • Save downloaded content when in app purchase is complete

    - by jakob
    Hello experts! I have created an app which allows users to buy non-consumable content. The retrieving-ids-payment-process works like a charm. What i can't really figure out is how my content should be saved into the phone. The existing structure is that I have all my current content in Resources/packages/. For every package there is an matching entry in a package.plist. When the purchase is complete it is time to download the content from the server. What i retrieve from the server is a zip file with the new package that I have bought. My observer will call a method named provideContent: -(void) provideContent: (NSString*) productIdentifier { In here I will call my server and download the package } What i need from you guys is some sort of step by step walkthrough or tutorial of how, when the zip is retrieved(is zip allowed?), unpack this zip and add it to my current package structure. Thank you in advance

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  • [CFArray release]: message sent to deallocated instance

    - by arielcamus
    Hi, I'm using the following method in my code: - (NSMutableArray *) newOrderedArray:(NSMutableArray *)array ByKey:(NSString *)key ascending:(BOOL)ascending { NSSortDescriptor *idDescriptor = [[NSSortDescriptor alloc] initWithKey:key ascending:ascending]; NSArray *sortDescriptors = [NSArray arrayWithObject:idDescriptor]; NSArray *orderArray = [array sortedArrayUsingDescriptors:sortDescriptors]; [idDescriptor release]; NSMutableArray *result = [NSMutableArray arrayWithArray:orderArray]; return result; } Is this a well-coded convenience method? As I think, it returns an autoreleased NSMutableArray. This method is called by another one: - (id) otherMethod { NSMutableArray *otherResult = [[[NSMutableArray alloc] initWithCapacity:[otherArray count]] autorelease]; // I add some stuff to otherResult and then... NSMutableArray *result = [dbUtils newOrderedArray:otherResult ByKey:@"objectId" ascending:NO]; return result; } This method (otherMethod) is called in some view controller where I want to store returned array and release it when deallocating the view controller. However, when [result retain] is called in this view controller (because I need it to be available and I can't allow it to be deallocated) I receive the following error: [CFArray release]: message sent to deallocated instance I've tried to log [result retainCount] just before calling retain and it print "1". I don't understand why an error is thrown when calling retain. Thank you, A

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  • Navigation Items in UITableViewController are not appearing?

    - by Sheehan Alam
    I am displaying a UITableViewController inside of a UITabBarController that is being presented modally: -(IBAction)arButtonClicked:(id)sender{ //this is a uitableviewcontroller ARViewController* arViewController = [[[ARViewController alloc] initWithNibName:@"ARViewController" bundle:nil]autorelease]; LeaderBoardTableViewController* lbViewController = [[[LeaderBoardTableViewController alloc] initWithNibName:@"LeaderBoardTableViewController" bundle:nil]autorelease]; lbViewController.title = @"Leaderboard"; arTabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil]; arTabBarController.viewControllers = [NSArray arrayWithObjects:arViewController, lbViewController, nil]; arTabBarController.selectedViewController = arViewController; [self presentModalViewController:arTabBarController animated:YES]; } In my viewDidLoad for arViewController method I am setting the navigation items: - (void)viewDidLoad { [super viewDidLoad]; // Uncomment the following line to preserve selection between presentations. self.clearsSelectionOnViewWillAppear = NO; self.title = @"AR"; leaderBoardButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemOrganize target:self action:@selector(leaderBoardButtonClicked:)]; self.navigationItem.rightBarButtonItem = leaderBoardButton; } My navigation bar doesn't appear when it is inside of the UITabBarController, but when I push the view itself I am able to see it. What am I missing?

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  • Core Data - How to check if a managed object's properties have been deallocated?

    - by georryan
    I've created a program that uses core data and it works beautifully. I've since attempted to move all my core data methods calls and fetch routines into a class that is self contained. My main program then instantiates that class and makes some basic method calls into that class, and the class then does all the core data stuff behind the scenes. What I'm running into, is that sometimes I'll find that when I grab a managed object from the context, I'll have a valid object, but its properties have been deallocated, and I'll cause a crash. I've played with the zombies and looked for memory leaks, and what I have gathered is it seems that the run loop is probably responsible for deallocating the memory, but I'm not sure. Is there a way to determine if that memory has been deallocated and force the core data to get it back if I need to access it? My managedObjectContext never gets deallocated, and the fetchedResultsController never does, either. I thought maybe I needed to use the [managedObjectContext refreshObject:mergeData:] method, or the [managedObjectContext setRetainsRegisteredObjects:] method. Although, I'm under the impression that last one may not be the best bet since it will be more memory intensive (from what I understand). These errors only popped up when I moved the core data calls into another class file, and they are random when they show up. Any insight would be appreciated. -Ryan

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  • How to load different XIBs for different device orientations for same viewcontroller?

    - by Jaanus
    The documentation says that if I want to support both portrait and landscape, I basically have two ways of doing that: Set up the viewcontroller's view so that the subviews autoresize correctly and make smaller changes programmatically at runtime If the changes are more substantial, create an alternative landscape interface and push/pop the alternative modal viewcontroller at runtime I would like to present the info where the layout is substantially different, but logic is the same. Ideally, I would load another XIB for the same viewcontroller, but it does not seem to be an option. Sounds like #2 is what I need to do, but my problem with that is that it sounds like it would use the standard modalviewcontroller animations that are nothing like the device rotation animation. (Of course, being the lazywebber that I am, I did not test this hypothesis.) So, how do I load an alternative layout for landscape with the same viewcontroller but different XIB? Should I use the method #2 above and is the rotation animation natural? Or is there some other way?

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  • Transform/redraw view after pinch zoom on x-axis

    - by Jonathan
    My setup. UIScrollView (scrollView) - UIView (contentView) - UIView (subView) I have managed to do so I can zoom contentView only on the x-axis. The problem is that subView is containing a graph. When contentView is zoomed and transformed the graph gets unsharp and distorded since the scaling only effect the x-axis. What I need help with is to somehow redraw the contentView after I'm done with the zooming without distorting the graph. Is it possible to transform the contentView so that the graph stays sharp even if you only zoom in the x-axis or redraw the content in the zoomed/stretched view somehow? I have tried the solution in this thread link but haven't succeeded to get it running.

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  • How to provide an own contentView for using -drawRect?

    - by mystify
    I want to use -drawRect: in an UITableViewCell subclass but it is covered by contentView. So the best option seems to be that I make a UIView subclass with my -drawRect: code and use that as contentView. But how could I feed my UITableViewCell subclass with that contentView? UITableViewCell creates that on its own when the contentView property is accessed. Would I simply override the getter method and then provide my own view there?

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  • collision with moving objects

    - by blacksheep
    tried to write a collision with the moving "floats" but did not succeed. maybe wrong place of the "collision" code? thanx 4 help! // // FruitsView.m // import "FruitsView.h" import "Constants.h" import "Utilities.h" define kFloat1Speed 0.15 define kFloat2Speed 0.3 define kFloat3Speed 0.2 @interface FruitsView (Private) - (void) stopTimer; @end @implementation FruitsView @synthesize apple, float1, float2, float3, posFloat1, posFloat2, posFloat3; -(void)onTimer { float1.center = CGPointMake(float1.center.x+posFloat1.x,float1.cen ter.y+posFloat1.y); if(float1.center.x 380 || float1.center.x < -60) posFloat1.x = -posFloat1.x; if(float1.center.y 100 || float1.center.y < -40) posFloat1.y = -posFloat1.y; float2.center = CGPointMake(float2.center.x+posFloat2.x,float2.cen ter.y+posFloat2.y); if(float2.center.x 380 || float2.center.x < -50) posFloat2.x = -posFloat2.x; if(float2.center.y 150 || float2.center.y < -30) posFloat2.y = -posFloat2.y; float3.center = CGPointMake(float3.center.x+posFloat3.x,float3.cen ter.y+posFloat3.y); if(float3.center.x 380 || float3.center.x < -70) posFloat3.x = -posFloat3.x; if(float3.center.y 100 || float3.center.y < -20) posFloat3.y = -posFloat3.y; if(CGRectIntersectsRect(apple.frame,float1.frame)) { if(apple.center.y float1.center.y) { posApple.y = -posApple.y; } } if(CGRectIntersectsRect(apple.frame,float2.frame)) { if(apple.center.y float2.center.y) { posFloat2.y = -posFloat2.y; } } if(CGRectIntersectsRect(apple.frame,float3.frame)) { if(apple.center.y float3.center.y) { posFloat3.y = -posFloat3.y; } } } pragma mark Initialisation/destruction (void)awakeFromNib { [NSTimer scheduledTimerWithTimeInterval:0.0001 target:self selector:@selector(onTimer) userInfo:nil repeats:YES]; posFloat1 = CGPointMake(kFloat1Speed, 0); posFloat2 = CGPointMake(kFloat2Speed, 0); posFloat3 = CGPointMake(kFloat3Speed, 0); timer = nil; modeLock = lockNotYetChosen; defaultSize = self.bounds.size.width; modal = self.tag; [[UIAccelerometer sharedAccelerometer] setDelegate:self]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationRepeatCount:1]; eadbea.transform = CGAffineTransformMakeScale(0.5,0.5); [UIView commitAnimations]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationRepeatCount:1]; apple.transform = CGAffineTransformMakeScale(0.5,0.5); [UIView commitAnimations]; } pragma mark Background animation processing (void) startTimer { if (!timer) { timer = [[NSTimer scheduledTimerWithTimeInterval:1.0/60.0 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES] retain]; } } (void) stopTimer { [timer invalidate]; [timer release]; timer = nil; } (void) check:(CGPoint*)position delta:(CGSize*)delta halfSize:(CGSize)halfSize forBouncingAgainst:(CGSize)containerSize { if ((position-x - halfSize.width)<0) { delta-width = fabsf(delta-width)*BOUNCE_DAMPING; position-x = halfSize.width; } if ((position-x + halfSize.width)containerSize.width) { delta-width = fabsf(delta-width)*-BOUNCE_DAMPING; position-x = containerSize.width - halfSize.width; } if ((position-y - halfSize.height)<0) { delta-height = fabsf(delta-height)*BOUNCE_DAMPING; position-y = halfSize.height; } if ((position-y + halfSize.height)containerSize.height) { delta-height = fabsf(delta-height)*-BOUNCE_DAMPING; position-y = containerSize.height - halfSize.height; } } (void) timerTick: (NSTimer*)timer { dragDelta = CGSizeScale(dragDelta, INERTIAL_DAMPING); if ((fabsf(dragDelta.width)DELTA_ZERO_THRESHOLD) || (fabsf(dragDelta.height)DELTA_ZERO_THRESHOLD)) { CGPoint ctr = CGPointApplyDelta(self.center, dragDelta); CGSize halfSize = CGSizeMake(self.bounds.size.width/4, self.bounds.size.height/4); [self check:&ctr delta:&dragDelta halfSize:halfSize forBouncingAgainst:self.superview.bounds.size]; self.center = ctr; } else { [self stopTimer]; } } pragma mark Input Handling (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent )event { NSSet allTouches = [event touchesForView:self]; if ([allTouches count]==1) { if (modeLocklockNotYetChosen) return; UITouch* anyTouch = [touches anyObject]; lastMove = anyTouch.timestamp; CGPoint now = [anyTouch locationInView: self.superview]; CGPoint then = [anyTouch previousLocationInView: self.superview]; dragDelta = CGPointDelta(now, then); self.center = CGPointApplyDelta(self.center, dragDelta); [self stopTimer]; } } (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSSet* allTouches = [event touchesForView:self]; if ([touches count]==[allTouches count]) { modeLock = lockNotYetChosen; if ((event.timestamp - lastMove) MOVEMENT_PAUSE_THRESHOLD) return; if ((fabsf(dragDelta.width)INERTIA_THRESHOLD) || (fabsf(dragDelta.height)INERTIA_THRESHOLD)) { [self startTimer]; } } } (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { modeLock = lockNotYetChosen; [self stopTimer]; } (void)dealloc { [float1 release]; [float2 release]; [float3 release]; [apple release]; [bear_head release]; [self stopTimer]; [super dealloc]; } @end

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  • Proper way to setup a UISegmentedControll on UINavigationController UINavigationBar all inside UITab

    - by Kaspa
    The title pretty much describes it all. The problem being the handling of the UISegmentedControll callbacks (button presses). If the content type of all of the nested views was the same (i.e. some UITableViewControllers) then I could just switch dataSource'es and reload the tables. However this is not the case, I have 3 very different views in there that allow further drilldown / interaction based on the NavigationControllers. So the way I have this set up ATM is that there is a "container" class that I put all of the UINavigationControllers in. They all share the same and one UISegmentedController and I redirect the callbacks to the container view controller. This does not feel too good at all. Additionally there is a problem when the user taps on the tab bar icon, the navigation controller pops to root which is ... the empty container view. Here's a picture of what I want to achieve:

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  • How to add View Controller with Tab Bar interfaced View Controller

    - by TechFusion
    I have created Window based Tab Bar controller app, One Tab Bar of viewController has been interfaced with WebVIew ..I am looking to create another view once touch event happened in that WebView.. //TabBarViewController.m - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { TabMainView *mainView = [[TabMainView alloc] init]; mainView.hidesBottomBarWhenPushed = YES; [self.navigationController pushViewController: mainView animated:YES]; [mainView release]; } I have created MainView, which is UIViewController Subclass. //TabMainView.m - (void)loadView { CGRect frame = CGRectMake(0.0, 0.0, 480, 320); WebView = [[[UIWebView alloc] initWithFrame:frame] autorelease]; WebView.backgroundColor = [UIColor whiteColor]; WebView.scalesPageToFit = YES; WebView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin); WebView.autoresizesSubviews = YES; WebView.exclusiveTouch = YES; //self.WebView.UserInteractionEnabled = NO; WebView.clearsContextBeforeDrawing = YES; self.view = WebView; [WebView release]; } - (void)viewWillAppear:(BOOL)animated { [self.WebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com"]]]; } Here when touch event happened then it is not passing control to TabMainView.m 's Viewload function although I am pushing it's view? TabBarView is also UIViewController subclass not a UINavigationController.

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  • Calculating File size before download

    - by sagar
    Ok ! Coming to the point directly. What I want to do is explained as follows. I have an url of MP3 file. ( for example Sound File ) Now, When user starts application. Download should start & for that I have implemented following methods. -(void)viewDidLoad { [super viewDidLoad]; NSURL *url=[NSURL URLWithString:@"http://xyz.pqr.com/abc.mp3"]; NSURLRequest *req=[NSURLRequest requestWithURL:url cachePolicy:NSURLCacheStorageNotAllowed timeoutInterval:120]; NSURLConnection *con=[[NSURLConnection alloc] initWithRequest:req delegate:self startImmediately:YES]; if(con){ myWebData=[[NSMutableData data] retain]; } else { // [MainHandler performSelector:@selector(targetSelector:) withObject:nil]; } } -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ NSLog(@"%@",@"connection established"); [myWebData setLength: 0]; } -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { NSLog(@"%@",@"connection receiving data"); [myWebData appendData:data]; } -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"%@",@"connection failed"); [connection release]; // [AlertViewHandler showAlertWithErrorMessage:@"Sorry, there is no network connection. Please check your network and try again."]; // [self parserDidEndDocument:nil]; } -(void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; } Now, Above methods work perfectly for downloading. But missing points are as follows. I can not get the exact size which is going to be downloaded. ( means I want to know what is the size of file - which is going to be download )

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  • Does the Fetch Request do the recommended batch faulting?

    - by dontWatchMyProfile
    I'm curious. Apple says in the docs: Core Data automatically fires faults when necessary (when a persistent property of a fault is accessed). However, firing faults individually can be inefficient, and there are better strategies for getting data from the persistent store (see “Batch Faulting and Pre-fetching with the SQLite Store”). NSFetchRequest has this feature: [fetchRequest setFetchBatchSize:20]; Is this essentially performing such a batch faulting like recommended? Just to make this clear for others, faulting does not mean "turning into a fault" but it means "materializing it", just like "making a Scooby-Doo out of it". Pretty ugly wording error, in my opinion, but it's at least consistent in the docs ;)

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  • No method found compiler warning

    - by Magic Bullet Dave
    I have create a class from a string, check it is valid and then check if it responds to a particular method. If it does then I call the method. It all works fine, except I get an annoying compiler warning: "warning: no '-setCurrentID:' method found". Am I doing something wrong here? Is there anyway to tell the compiler all is ok and stop it reporting a warning? The here is the code: // Create an instance of the class id viewController = [[NSClassFromString(class) alloc] init]; // Check the class supports the methods to set the row and section if ([viewController respondsToSelector:@selector(setCurrentID:)]) { [viewController setCurrentID:itemID]; } // Push the view controller onto the tab bar stack [self.navigationController pushViewController:viewController animated:YES]; [viewController release]; Cheers Dave

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  • UITableViewCell repeating problem

    - by cannyboy
    I have a UItableview with cells. Some cells have uilabels and some have uibuttons. The UIbuttons are created whenever the first character in an array is "^". However, the uibuttons repeat when i scroll down (appearing over the uilabel).. and then multiply over the uilabels when I scroll up. Any clues why? My voluminous code is below: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { const NSInteger LABEL_TAG = 1001; UILabel *label; UIButton *linkButton; //NSString *linkString; static NSString *CellIdentifier; UITableViewCell *cell; CellIdentifier = @"TableCell"; cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; label = [[UILabel alloc] initWithFrame:CGRectZero]; [cell.contentView addSubview:label]; [label setLineBreakMode:UILineBreakModeWordWrap]; [label setMinimumFontSize:FONT_SIZE]; [label setNumberOfLines:0]; //[label setBackgroundColor:[UIColor redColor]]; [label setTag:LABEL_TAG]; NSString *firstChar = [[paragraphs objectAtIndex:indexPath.row] substringToIndex:1]; NSLog(@"firstChar %@", firstChar); NSLog(@"before comparison"); if ([firstChar isEqualToString:@"^"]) { // not called NSLog(@"BUTTON"); //[label setFont:[UIFont boldSystemFontOfSize:FONT_SIZE]]; linkButton = [UIButton buttonWithType:UIButtonTypeCustom]; linkButton.frame = CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, 280, 30); [cell.contentView addSubview:linkButton]; NSString *myString = [paragraphs objectAtIndex:indexPath.row]; NSArray *myArray = [myString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"*"]]; NSString *noHash = [myArray objectAtIndex:1]; [linkButton setBackgroundImage:[UIImage imageNamed:@"linkButton.png"] forState:UIControlStateNormal]; linkButton.adjustsImageWhenHighlighted = YES; [linkButton setTitle:noHash forState:UIControlStateNormal]; linkButton.titleLabel.font = [UIFont systemFontOfSize:FONT_SIZE]; [linkButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [linkButton setTag:indexPath.row]; [linkButton addTarget:self action:@selector(openSafari:) forControlEvents:UIControlEventTouchUpInside]; //size = [noAsterisks sizeWithFont:[UIFont boldSystemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap]; [label setBackgroundColor:[UIColor clearColor]]; [label setText:@""]; } cell.selectionStyle = UITableViewCellSelectionStyleNone; } else { label = (UILabel *)[cell viewWithTag:LABEL_TAG]; NSString *firstChar = [[paragraphs objectAtIndex:indexPath.row] substringToIndex:1]; NSLog(@"firstChar %@", firstChar); NSLog(@"before comparison"); if ([firstChar isEqualToString:@"^"]) { NSLog(@"cell not nil, reusing linkButton"); linkButton = (UIButton *)[cell viewWithTag:indexPath.row]; } } if (!label) label = (UILabel*)[cell viewWithTag:LABEL_TAG]; NSString *textString = [paragraphs objectAtIndex:indexPath.row]; NSString *noAsterisks = [textString stringByReplacingOccurrencesOfString:@"*" withString:@""] ; CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f); CGSize size; NSString *firstChar = [[paragraphs objectAtIndex:indexPath.row] substringToIndex:1]; //NSLog(@"firstChar %@", firstChar); if ([firstChar isEqualToString:@"^"]) { NSLog(@"BUTTON2"); if (!linkButton) linkButton = (UIButton*)[cell viewWithTag:indexPath.row]; linkButton = [UIButton buttonWithType:UIButtonTypeCustom]; linkButton.frame = CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, 280, 30); [cell.contentView addSubview:linkButton]; NSString *myString = [paragraphs objectAtIndex:indexPath.row]; NSArray *myArray = [myString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"*"]]; NSString *noHash = [myArray objectAtIndex:1]; [linkButton setBackgroundImage:[UIImage imageNamed:@"linkButton.png"] forState:UIControlStateNormal]; linkButton.adjustsImageWhenHighlighted = YES; [linkButton setTitle:noHash forState:UIControlStateNormal]; linkButton.titleLabel.font = [UIFont systemFontOfSize:FONT_SIZE]; [linkButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [linkButton setTag:indexPath.row]; [linkButton addTarget:self action:@selector(openSafari:) forControlEvents:UIControlEventTouchUpInside]; size = [noAsterisks sizeWithFont:[UIFont boldSystemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap]; [label setBackgroundColor:[UIColor clearColor]]; [label setText:@""]; } else if ([firstChar isEqualToString:@"*"]) { size = [noAsterisks sizeWithFont:[UIFont boldSystemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap]; [label setFont:[UIFont boldSystemFontOfSize:FONT_SIZE]]; [label setText:noAsterisks]; NSLog(@"bold"); } else { size = [noAsterisks sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap]; [label setFont:[UIFont systemFontOfSize:FONT_SIZE]]; [label setText:noAsterisks]; } [label setFrame:CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), MAX(size.height, 20.0f))]; cell.selectionStyle = UITableViewCellSelectionStyleNone; cell.accessoryType = UITableViewCellAccessoryNone; return cell; }

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  • Will pool the connection help threading in sqlite (and how)?

    - by mamcx
    I currently use a singleton to acces my database (see related question) but now when try to add some background processing everything fall apart. I read the sqlite docs and found that sqlite could work thread-safe, but each thread must have their own db connection. I try using egodatabase that promise a sqlite wrapper with thread safety but is very buggy, so I return to my old FMDB library I start to see how use it in multi-thread way. Because I have all code with the idea of singleton, change everything will be expensive (and a lot of open/close connections could become slow), so I wonder if, as the sqlite docs hint, build a pooling for each connection will help. If is the case, how make it? How know wich connection get from the pool (because 2 threads can't share the connection)? I wonder if somebody already use sqlite in multu-threading with NSOperation or similar stuff, my searching only return "yeah, its possible" but let the details to my imagination...

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