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• UITableView: moving a row into an empty section

  - by Frank C

  I have a UITableView with some empty sections. I'd like the user to be able to move a row into them using the standard edit mode controls. The only way I can do it so far is to have a dummy row in my "empty" sections and try to hide it by using tableView:heightForRowAtIndexPath: to give the dummy row a height of zero. This seems to leave it as a 1-pixel row. I can probably hide this by making a special type of cell that's just filled with [UIColor groupTableViewBackgroundColor], but is there a better way? This is all in the grouped mode of UITableView UPDATE: Looks like moving rows into empty sections IS possible without any tricks, but the "sensitivity" is bad enough that you DO need tricks in order to make it usable for general users (who won't be patient enough to slowly hover the row around the empty section until things click)

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• How do I get toolbars on UISplitView detail & root views?

  - by Gerry

  I'm porting my iPhone app to iPad. I have a bunch of detail views that derive from UIViewController and implement UITableViewDelegate. (Basically TableViews but not derived as such). The old app used TabBar, but now I'd like to use SplitView with toolbars on the Detail and Master views. How do I enable a toolbar on my UIViewController inside a UISplitViewController? I'm not using Interface Builder here, just code. @interface HeadlineViewController : UIViewController { UITableView *tableView; NSMutableArray *bullIds; UIActivityIndicatorView *prog; } Thanks,

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• The accossoryView of a UITableViewCell disappears after the visible view is changed

  - by Luca

  Hi! I'm experiencing this strange situation. I have a UITableView where, when the user selects a cell, a long (network) process begins. So, I performed this in a background thread and I placed (in the didSelectRowAtIndexPath) a UIActivityIndicatorView as the accessory view. This is what I wrote: UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:indexPath]; UIActivityIndicatorView* activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; cell.accessoryView = activityView; [activityView startAnimating]; [activityView release]; everything seems to work correctly, except that, if during a loading process (when the indicator is animated), I switch the view using a UITabBar, when I go back to the UITableView, the UIActivityIndicatorView that should still be there has disappeared. Any idea of what I did wrong? Thanks!

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• take images from a cell , into next view controller

  - by richard Stephenson

  hi guys , i asked this question yesterday but it doesnt seem to have asked properly so im trying again in my app im parsing in an xml file , in that file there is a path for an image to download an in my tableview controler i have this to download the image and display it in the cell NSURL *url = [NSURL URLWithString:aStory.picture]; NSData *data = [NSData dataWithContentsOfURL:url]; UIImage *img = [[UIImage alloc] initWithData:data]; im then pushing another view controller on the top and displaying some text in a text view , but i also want to take the image from the cell selected and put that in there too , but everything i try does not work. any ideas on how i can do this Thanks in advance Richard

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• How to change a grouped UITableView cell's background to black (or non-white)?

  - by Meltemi

  Just want to make sure I'm not overlooking something obvious... It seems like it should be trivial to set the background color (black is fine) of a UITableView's cell to something other than white or completely transparent so that you can display your data with white text. However, with my attempts I lose the corners on my grouped table view and it all looks like crap. I've seen & understand the methods described by Matt Gallagher about customizing TableView cells with exotic gradients, etc. but wanted to be certain before heading down that path...

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• iPhone: Having trouble figuring out how to scroll a UITableView with custom UITextField cells automa

  - by Gordon Fontenot

  Ok, I know this seems like a duplicate question, but don't think it is. I actually have this implemented already (thanks to this SO question), but it seems sluggish. I am willing to tweak it a bit, but I ran across a demo app by AboutObjects that seems to have exactly the right functionality with absolutely no code doing it. I have looked through their demo code dozens of times, and I can't figure out what they are doing that I am not. The code to look at is in their iPhone Development Tutorials section, and is called "Editable TableView" (2nd from the bottom). There are a couple of questions on the forums on that site asking how they got the functionality, but there is no answer (other than "It's a built in function"). Does anyone have any clue as to why their UITableView would implement the input scrolling by default (including being able to scroll the view manually when the keyboard pops up, which I cannot get to work)?

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• Storyboard elements are not sized properly on the device

  - by Joel Fischer

  In the storyboard, I am placing a table view element into a subclassed UIView. The element is not appearing on the iPad device I am running it on the same as it appears in the storyboard however. This also happens for additional content that I place into the storyboard. Below is a screenshot as it appears in the storyboard, as well as UI width/height information. And here is the description of the UI file running on the iPad. https://gist.github.com/4323186 (embedding it directly into the post is giving me problems) You'll notice that the tableview is explicitly set at 178 width, and is showing up in the description as 276 width. My initial thought was that perhaps a cell was forcing the parent to be larger (I'm very new to iOS UI development), but drilling into that shows the prototype cell it appears that the width is defined by it's parent at 178. The image views and label also are appearing in the incorrect spot, as shown in the second image below.

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• Why is my NSMutableArray returning nill?

  - by lampShade

  I have a very simple task: add the contents of a textField to an NSMutableArray.The Problem is the array is returning nill. I believe that it has something to do with the fact that the array I'm using is declared as an instance variable. /* IBOutlet NSTextField *textField; IBOutlet NSTabView *tableView; IBOutlet NSButton *button; NSMutableArray *myArray; */ #import "AppController.h" @implementation AppController -(IBAction)addNewItem:(id)sender { NSString *string = [textField stringValue]; NSLog(@"%@",string); [myArray addObject:string]; NSLog(@"%d",[myArray count]);//this outputs 0 why is that? }

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• Get a image from a uiview

  - by Monobono

  Hi I want to perform a shrink animation on a UITableVIew. I experimented a bit and found out that the animation runs much faster when I shrink a UIImageView with an image of the current state of the tableview instead of shrinking the table view itself. I grabbed the image in a method in my main viewcontroller prior to the animation: UIGraphicsBeginImageContext(mainTableView.bounds.size); [resizeContainer.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); Works like a charm, at least almost. On very rare occasions I get weird graphic glitches, where the UIImage starts to overlap a toolbar that lies underneath it. I just want to make sure that I am getting the image in the right way. I am laking the necessary understand of GraphicContexts to be sure about it. To cut a long story short, is my code correct? Thx

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• iPhone Advanced table view cells example

  - by Rob

  I have been going through and re-creating Apple's "Advanced Table View Cells" example to better understand everything. I have done everything, but somehow missed one detail and I can't figure it out. If you launch their example (http://developer.apple.com/iphone/library/samplecode/AdvancedTableViewCells/Introduction/Intro.html) and open up the RootViewController.xib file, they have a "tableView" outlet on the inspector that is linked to File's Owner. For whatever reason, I can't get that to show up on my version. My code is almost verbatim of Apple's, so what am I missing? Did I not declare that somewhere or doesn't that get taken from the RootViewController.m file?

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• UIImage from NSDocumentDirectory leaking memory

  - by Emil

  Hey. I currently have this code: UIImage *image = [[UIImage alloc] initWithContentsOfFile:[imagesPath stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@.png", [postsArrayID objectAtIndex:indexPath.row]]]]; It's loading in an image to set in a UITableViewCell. This obviously leaks a lot of memory (I do release it, two lines down after setting the cells image to be that image), and I'm not sure if it caches the image at all. Is there another way, that doesen't leak so much, I can use to load in images multiple times, like in a tableView, from the Documents-directory of my app? Thanks.

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• Set tag and hidden for objects on custom UITableViewCell

  - by Rob

  I am re-using Apple's AdvancedTableViewCells example to create a custom, fast-scrolling tableview. Specifically, I am using their CompositeSubviewBasedApplicationCell method which draws the content on the tableviewcell with drawRect Everything works, but how do you hide a label or set the tag for a label or image using their method? Doing it this way is pretty new to me (without IB), so I apologize ahead of time if it's something easy. The code that sets the cell content is: - (void)drawRect:(CGRect)rect { [_cell.animalIcon drawAtPoint:CGPointMake(5.0, 5.0)]; [_cell.animalName drawAtPoint:CGPointMake(93.0, 25.0)]; _highlighted ? [[UIColor whiteColor] set] : [[UIColor colorWithWhite:0.23 alpha:1.0] set]; [_cell.animalDescription drawAtPoint:CGPointMake(100.0, 54.0) withFont:[UIFont boldSystemFontOfSize:13.0]]; [_cell.animalNameString drawAtPoint:CGPointMake(93.0, 5.0) withFont:[UIFont boldSystemFontOfSize:13.0]]; }

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• Invalid argument exception - Navigation bar, tab bar, UIView.

  - by Tejaswi Yerukalapudi

  Class 1 has the following code that generates the exception - -(IBAction) searchAllAction: (id) sender { AddDiagSearchController *search = [[AddDiagSearchController alloc] initWithNibName:@"DiagSearch" bundle:nil]; [self.navigationController pushViewController:search animated:YES]; } the pushViewController part generates the following exception - 2010-04-14 14:03:31.060 Nav[10314:207] *** -[UIView addTarget:action:forControlEvents:]: unrecognized selector sent to instance 0x3956a80 And the class I'm trying to push has the following code. All the connections for IBOutlets were made through the interface builder. It's has a tableView, search text bar and a tabbar at the bottom and I'll be adding this to a UINavigationController. @interface AddDiagSearchController : UIViewController <UITableViewDataSource, UITableViewDelegate>{ UIBarButtonItem *quickAdd; UIBarButtonItem *searchAll; UITextField *searchTxt; } @property (nonatomic, retain) IBOutlet UITextField *searchTxt; -(IBAction) searchAllClicked:(id) sender; -(IBAction) quickAddClicked:(id) sender; -(IBAction) searchBtnClicked; -(IBAction) resignResponder: (id) sender; @end

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• How do I blur (ios7 style) a section of an image in a UITableViewCell?

  - by George McKibbin

  I've got a UIImageView that takes up the whole cell and shows an image. I'd like to blur the bottom third of the view in the iOS7 style (we're targeting iOS7). There will be a label over the blurred part. The issue seems to be that I can't "screenshot" the UIImageView right as I am setting up the cell in tableView:cellForRowAtIndexPath: as it hasn't loaded yet. Although i've even tried setting up a timer for a 0.1 second delay and that also doesn't work. I've tried the stuff on http://damir.me/posts/ios7-blurring-techniques I've tried https://github.com/justinmfischer/7blur I'd like to use the new screenshotting API drawViewHierarchyInRect:afterScreenUpdates: I'd also like to use apple's sample code UIImage+ImageEffects The only thing that has worked so far has been to just put a UIToolbar in but the performance is really slow. I don't need dynamic updates. I've managed to get the following effect a few times but it has just tinted the view and hasn't actually blurred anything so I'm a bit confused.

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• How to reload a table view in a view controller in iphone?

  - by Warrior

  I am new to iphone development.I have created a table view in a view controller. I want to reload the table view so that i can display the contents which are parsed previously in delegates. More over reloadData does only reload the cells. It doesn't take care of actually updating the underlying datasource. E.g. if i read data from an array in tableView:cellForRowAtIndexPath:, I have to change the array values befor calling reloadData. How can i achieve this. Please help me out.Thanks.

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• Custom Scrollbar for UITableView

  - by iFloh

  the iTunes song list display is a TableView that has a dotted scrollbar on the right which allows me to jump to a relative position of the list (i.e. if I click the bar at 2/3 down I am scrolled to the 66% position of the list. I want to do the same in my UITableView, but am not sure whether this is standard functionality that I can use (which class?) or whether this is a custom build ... If the latter, has someone got some samplecode that I could use as a template?

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• mouseover detection in NSTableView's NSCell?

  - by Wigwam

  I am wanting to change the text background color on a tableview's cell when it is hovered upon, similar to how AddressBook "highlights" the label of a contact's element when you mouseover the label names. However I cannot figure out how to accomplish... detecting a mouseover on a particular NSCell and... After detecting the cell his hovered upon, highlighting the text in that cell (not highlighting the entire row as if the user selected that row) As NSCell is not a subclass of NSView this seems to be a very difficult task. Any example of this or explanation on how this might be done would be greatly appreciated. Thanks!

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• How do you do a foursquare style uitableview refresh?

  - by nickthedude

  If you haven't seen their implementation Of the refresh of a tableview it is extremely slick. I was surprised to see no search results asking for this to be explained so I figured ask it myself. If you haven't seen it, it basically adds a subviews to the uitableview above the header to the blank part of the screen when you pull a uitableview view down farther than it has data to display. Sorry if that doesn't make sense but just download the app and you will immediately want to do it too. Just wondering how they did it?

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• Background image of table cell

  - by Shuaib

  Hey guys, Trying to set a background image for a table view cell, tried almost everything but failing. Hoping someone would notice what I am doing wrong. Here is how my current code looks like: static NSString *CustomCellIdentifier = @"listCustomCell"; listCustomCell *cell = (listCustomCell *)[tableView dequeueReusableCellWithIdentifier: CustomCellIdentifier]; if (cell == nil) { NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"listCustomCell" owner:self options:nil]; for (id oneObject in nib) if ([oneObject isKindOfClass:[listCustomCell class]]) cell = (listCustomCell *)oneObject; } cell.backgroundColor = [UIColor clearColor]; UIImageView *backgroundImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"list_selected.png"]]; //[cell setBackgroundView:backgroundImageView]; cell.backgroundView = backgroundImageView; The image won't show up in the background of the cell. All I see is plain white background. Thanks for help.

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• How to add a TabBar to NavigationController based iPhone app

  - by Alex

  I have a simple NavigationController based app. The main window shows a TableView and selecting an item loads a sub-view. I used Interface Builder for UI views. Now I want to add a TabBar to the app. Where do I put it? Do I need a TabBarController? Should it go in the MainWindow.xib, or RootViewController.xib? How do I tie it together with my NavigationController?

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• Debugging runtime error "Terminating app due to uncaught exception 'NSInternalInconsistencyException

  - by Bill

  I'm going through the Beginning iPhone Development book & stuck in chapter 9. I've spent a few hours trying to debug this error w/o avail: 2010-05-01 19:27:51.361 Nav2[4113:20b] *** Assertion failure in -[UITableView _createPreparedCellForGlobalRow:withIndexPath:], /SourceCache/UIKit/UIKit-984.38/UITableView.m:4709 2010-05-01 19:27:51.362 Nav2[4113:20b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:' 2010-05-01 19:27:51.364 Nav2[4113:20b] Stack: ( ... ) I'm not looking for help w/ the book, but tips for how to debug this error? Can I pin down which of my cellForRowAtIndexPath methods is the problem? And how to inspect the type? Or other things should I look at?

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• Have a reloadData for a UITableView animate when changing

  - by Chris Butler

  Hi everyone. I have a UITableView that has two modes. When we switch between the modes I have a different number of sections and cells per section. Ideally, it would do some cool animation when the table grows or shrinks. Here is the code I tried, but it doesn't do anything: CGContextRef context = UIGraphicsGetCurrentContext(); [UIView beginAnimations:nil context:context]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [UIView setAnimationDuration:0.5]; [self.tableView reloadData]; [UIView commitAnimations]; Any thoughts on how I could do this? Thanks in advance.

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• Refreshing a UITableView

  - by MihaiD

  I have a UITableView subclass and a UITableViewCell sublass that I'm using for cells. I'm bulding all my cells in advance and store them in an array from where I use them in cellForRowAtIndexPath. Aside from this I have a thread that loads some images in each cell, in the background. The problem is that the cells don't get refreshed as fast as the images are loaded. For example, if I don't scroll my table view, the first cells only get refreshed when all cells have been modified and the thread has exited. Any ideas on how I can effectively refresh my tableview/cell?

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• iPhone app crashed: Assertion failed function evict_glyph_entry_from_strike, file Fonts/CGFontCache.

  - by Ross

  this happened quite randomly. I didn't delete any tableview cell, the backtrace information: Assertion failed: (d->entry[identifier.glyph] == g), function evict_glyph_entry_from_strike, file Fonts/CGFontCache.c, line 810. Program received signal: “SIGABRT”. (gdb) bt #0 0x97da5972 in __kill () #1 0x97da5964 in kill$UNIX2003 () #2 0x97e38ba5 in raise () #3 0x97e4ec5c in abort () #4 0x97e3b804 in __assert_rtn () #5 0x0037fe0e in evict_glyph_entry_from_cache () #6 0x003226aa in expire_glyphs_nl () #7 0x00322645 in CGFontCacheUnlock () #8 0x00321fef in CGGlyphLockUnlock () #9 0x0240f9b7 in ripc_DrawGlyphs () #10 0x0031b0d4 in draw_glyphs () #11 0x0031a91f in CGContextShowGlyphsWithAdvances () #12 0x35814178 in WebCore::Font::drawGlyphs () #13 0x35813da5 in WebCore::Font::drawGlyphBuffer () #14 0x35813aca in WebCore::Font::drawSimpleText () #15 0x35813760 in drawAtPoint () #16 0x3581307e in -[NSString(WebStringDrawing) _web_drawAtPoint:forWidth:withFont:ellipsis:letterSpacing:includeEmoji:] () #17 0x3090d2e9 in -[NSString(UIStringDrawing) drawAtPoint:forWidth:withFont:lineBreakMode:letterSpacing:includeEmoji:] () #18 0x3090cfe3 in -[NSString(UIStringDrawing) drawAtPoint:forWidth:withFont:lineBreakMode:] () #19 0x3093d853 in -[UINavigationItemView drawText:inRect:] () #20 0x3093a96b in -[UINavigationItemButtonView drawRect:] () #21 0x3091ff61 in -[UIView(CALayerDelegate) drawLayer:inContext:] () #22 0x0060daeb in -[CALayer drawInContext:] () #23 0x0060d8f9 in backing_callback () #24 0x0060d1b4 in CABackingStoreUpdate () #25 0x0060c3cc in -[CALayer _display] () #26 0x0060bf56 in CALayerDisplayIfNeeded () #27 0x0060b3bd in CA::Context::commit_transaction () #28 0x0060b022 in CA::Transaction::commit () #29 0x006132e0 in CA::Transaction::observer_callback () #30 0x30245c32 in __CFRunLoopDoObservers () #31 0x3024503f in CFRunLoopRunSpecific () #32 0x30244628 in CFRunLoopRunInMode () #33 0x32044c31 in GSEventRunModal () #34 0x32044cf6 in GSEventRun () #35 0x309021ee in UIApplicationMain ()

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• Grouping data in an NSMutable array

  - by padatronic

  Hi guys, I have an array i load with lots of data from an xml file. I am displaying this on a tableview and then when you click on say an author it goes through to display all their books. At the minute my NSMutableArray has an entry for every each book with title, author and so on. So in the table of authors it display the authors name as many times as they have books. I want to group the array data so the table only displays each author once but the author contains an array of his books. Seems simple but I can't find a group method for arrays. thanks peeps

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