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  • DTGridView losting content while scrolling

    - by Wim Haanstra
    I am using DTGridView from the DTKit by Daniel Tull. I implemented it in a very simple ViewController and the test I am doing is to place a button in the last row of the grid, which should add another row to the grid (and therefor moving the button to a row beneath it). The problem is, when I click the button a couple of times and then start scrolling, the grid seems to lose its content. As I am not completly sure this is a bug in the grid, but more in my code, I hope you guys can help me out and track down the bug. First I have my header file, which is quite simple, because this is a test: #import <UIKit/UIKit.h> #import "DTGridView.h" @interface TestController : UIViewController <DTGridViewDelegate, DTGridViewDataSource> { DTGridView* thumbGrid; } @end I declare a DTGridView, which will be my grid, where I want to put content in. Now, my code file: #import "TestController.h" @implementation TestController int rows = 1; - (NSInteger)numberOfRowsInGridView:(DTGridView *)gridView { return rows; } - (NSInteger)numberOfColumnsInGridView:(DTGridView *)gridView forRowWithIndex:(NSInteger)index { if (index == rows - 1) return 1; else return 3; } - (CGFloat)gridView:(DTGridView *)gridView heightForRow:(NSInteger)rowIndex { return 57.0f; } - (CGFloat)gridView:(DTGridView *)gridView widthForCellAtRow:(NSInteger)rowIndex column:(NSInteger)columnIndex { if (rowIndex == rows - 1) return 320.0f; else return 106.6f; } - (DTGridViewCell *)gridView:(DTGridView *)gridView viewForRow:(NSInteger)rowIndex column:(NSInteger)columnIndex { DTGridViewCell *view = [[gridView dequeueReusableCellWithIdentifier:@"thumbcell"] retain]; if (!view) view = [[DTGridViewCell alloc] initWithReuseIdentifier:@"thumbcell"]; if (rowIndex == rows - 1) { UIButton* btnLoadMoreItem = [[UIButton alloc] initWithFrame:CGRectMake(10, 0, 301, 57)]; [btnLoadMoreItem setTitle:[NSString stringWithFormat:@"Button %d", rowIndex] forState:UIControlStateNormal]; [btnLoadMoreItem.titleLabel setFont:[UIFont boldSystemFontOfSize:20]]; [btnLoadMoreItem setBackgroundImage:[[UIImage imageNamed:@"big-green-button.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0] forState:UIControlStateNormal]; [btnLoadMoreItem addTarget:self action:@selector(selectLoadMoreItems:) forControlEvents:UIControlEventTouchUpInside]; [view addSubview:btnLoadMoreItem]; [btnLoadMoreItem release]; } else { UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(10,0,100,57)]; label.text = [NSString stringWithFormat:@"%d x %d", rowIndex, columnIndex]; [view addSubview:label]; [label release]; } return [view autorelease]; } - (void) selectLoadMoreItems:(id) sender { rows++; [thumbGrid setNeedsDisplay]; } - (void)viewDidLoad { [super viewDidLoad]; thumbGrid = [[DTGridView alloc] initWithFrame:CGRectMake(0,0, 320, 320)]; thumbGrid.dataSource = self; thumbGrid.gridDelegate = self; [self.view addSubview:thumbGrid]; } - (void)viewDidUnload { [super viewDidUnload]; } - (void)dealloc { [super dealloc]; } @end I implement all the methods for the DataSource, which seem to work. The grid is filled with as many rows as my int 'rows' ( +1 ) has. The last row does NOT contain 3 columns, but just one. That cell contains a button which (when pressed) adds 1 to the 'rows' integer. The problem starts, when it starts reusing cells (I am guessing) and content start disappearing. When I scroll back up, the UILabels I am putting in the cells are gone. Is there some bug, code error, mistake, dumb-ass-move I am missing here? Hope anyone can help.

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  • converting NSMutableData to NSMutableDictionary?

    - by senthilmuthu
    hi, i am accumulating data from NSMutableDictionary to NSMutabledata like NSMutableData *data = [receivedData objectForKey:@"tag1"]; and also data = [receivedData objectForKey:@"tag2"]; after this one , how can i get data for @"tag2" only from NSMutableData? NSMutableData tag2Data = [Data forKey:@"tag2"]; is not working?

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  • Using NSXMLParser to parse Vimeo XML on iPhone.

    - by Sonny Fazio
    Hello, I'm working on an iPhone app that will use Vimeo Simple API to give me a listing our videos by a certain user, in a convenient TableView format. I'm new to Parsing XML and have tried TouchXML, TinyXML, and now NSXMLParser with no luck. Most tutorials on parsing XML are for a blog, and not for an API XML sheet. I've tried modifying the blog parsers to search for the specific tags, but it doesn't seem to work. Right now I'm working with NSXMLParser and it seems to correctly find the value of an XML tag, but when it goes to append it to a NSMutableString, it writes a whole bunch of nulls in between it. I'm using a tutorial from theappleblog and modifying it to work with Vimeo API - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{ if ([currentElement isEqualToString:@"video_title"]) { NSLog(@"String: %@",string); [currentTitle appendString:string]; } else if ([currentElement isEqualToString:@"video_url"]) { [currentLink appendString:string]; } else if ([currentElement isEqualToString:@"video_description"]) { [currentSummary appendString:string]; } else if ([currentElement isEqualToString:@"date"]) { [currentDate appendString:string]; } Here is the nulls it writes: http://grab.by/grabs/92d9cfc2df4fac3fe6579493b1a8e89f.png Then when it finishes, it has to add the NSMutableStrings into a NSMutableDictionary - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{ //NSLog(@"found this element: %@", elementName); currentElement = [elementName copy]; if ([elementName isEqualToString:@"item"]) { // clear out our story item caches... item = [[NSMutableDictionary alloc] init]; currentTitle = [[NSMutableString alloc] init]; currentDate = [[NSMutableString alloc] init]; currentSummary = [[NSMutableString alloc] init]; currentLink = [[NSMutableString alloc] init]; } } - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{ NSLog(@"Title: %@",currentTitle); if ([elementName isEqualToString:@"item"]) {// save values to an item, then store that item into the array... [item setObject:currentTitle forKey:@"video_title"]; NSLog(@"Current Title%@", currentTitle); [item setObject:currentLink forKey:@"video_url"]; [item setObject:currentSummary forKey:@"video_description"]; [item setObject:currentDate forKey:@"date"]; [stories addObject:[item copy]]; NSLog(@"adding story: %@", currentTitle); } } I would really appreciate it if someone has any advance

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  • UIKeyboard slides from wrong coordinates when in landscape, why?

    - by Horatiu Paraschiv
    Hi I have an app that starts in Landscape Right mode. When I tap a textField the keyboard should slide up, however first time when the keyboard slides it slides from the right (where the home button is). After that it slides up and down as expected. So only the first time when I call the keyboard in it comes from where it would come if the app would be in portrait mode. Does anyone know how can I fix this?

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  • UIDisplayLink stops updating when UIScrollView scrolled

    - by Tricky
    Title is quite self explanatory, but I have some animation being done in a loop triggered by UIDisplayLink. However, as soon as I scroll a UIScrollView I have added to my view hierarchy, the animation stops immediately, only to return again when scrolling has completely stopped and come to a standstill.... Anyway to cancel this behaviour?

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  • objc[989] objc_exception_throw failed.

    - by thyrgle
    I was just adding some more CCSprites to a CCLayer and it just starts crashing giving me the error: objc[989] objc_exception_throw failed. Is there like a limit to the amount of CCSprites you can have on a screen or something? I added the CCSprites doing the following with the CCSprites already declared at interface: L1Circle1 = [CCSprite spriteWithFile:@"LaserCircle.png"]; [L1Circle1 setPosition:ccp(180,180)]; [self addChild:L1Circle1]; What am I doing wrong?

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  • Handle row deletion in UITableViewController

    - by Kamchatka
    Hello, I hava a UINavigationController. The first level is a UITableViewController, the second level just shows details on one of the items of the table view. In this detail view, I can delete the item. It deletes the underlying managed object. When I pop back to the view, I have a crash. I understand why, it's because I didn't update the cached array that contains the data. I looked at several tutorials and I don't exactly understand how am I supposed to handle deletion. Maybe I don't understand exactly where I should fetch the objects in the model. Should I do a query for every cellForRowAtIndexPath and take the item in the result at position indexPath.row? It doesn't look efficient. Should I check for changes somewhere and recache the whole query in an array. I would think CoreData would provide something more natural but I couldn't find it so far. Thanks in advance.

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  • TabBarController NavigationController with black backgroundbar

    - by Simon
    hello I've placed this code my didload method, to get a black Navigationbar. rootTabBarController.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque; rootTabBarController.moreNavigationController.navigationBar.barStyle = UIBarStyleBlackOpaque; its working fine, but when the user rearranges the Icons in the editmode, i'm getting a default blue navigation bar. Can anyone help me to avid this ? btw: big thanks to the genius crowd!

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  • Objects do not retain the frame that I give then when using CGAffineTransforms with Core Animation

    - by user170030
    Hi, I'm making a game where when a card is touched, it grows so that it is focused, and when you 'let go', it goes back to its original size and place. This seems pretty standard, however, when I add cards and move the hand around to accommodate different numbers of cards, touching the card makes it go to its original place, and not to the new place. This has been stumping me for a while now Any hints would be much appreciated. Thanks !

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  • Using the contents of an array to set individual pixels in a Quartz bitmap context

    - by Magic Bullet Dave
    I have an array that contains the RGB colour values for each pixel in a 320 x 180 display. I would like to be able to set individual pixel values in the a bitmap context of the same size offscreen then display the bitmap context in a view. It appears that I have to create 1x1 rects and either put a stroke on them or a line of length 1 at the point in question. Is that correct? I'm looking for a very efficient way of getting the array data onto the graphics context as you can imagine this is going to be an image buffer that cycles at 25 frames per second and drawing in this way seems inefficient. I guess the other question is should I use OPENGL ES instead? Thoughts/best practice would be much appreciated. Regards Dave OK, have come a short way, but can't make the final hurdle and I am not sure why this isn't working: - (void) displayContentsOfArray1UsingBitmap: (CGContextRef)context { long bitmapData[WIDTH * HEIGHT]; // Build bitmap int i, j, h; for (i = 0; i < WIDTH; i++) { for (j = 0; j < HEIGHT; j++) { h = frameBuffer01[i][j]; bitmapData[i * j] = h; } } // Blit the bitmap to the context CGDataProviderRef providerRef = CGDataProviderCreateWithData(NULL, bitmapData,4 * WIDTH * HEIGHT, NULL); CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB(); CGImageRef imageRef = CGImageCreate(WIDTH, HEIGHT, 8, 32, WIDTH * 4, colorSpaceRef, kCGImageAlphaFirst, providerRef, NULL, YES, kCGRenderingIntentDefault); CGContextDrawImage(context, CGRectMake(0.0, HEIGHT, WIDTH, HEIGHT), imageRef); CGImageRelease(imageRef); CGColorSpaceRelease(colorSpaceRef); CGDataProviderRelease(providerRef); }

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  • How to deal with many to many relationships with NSFetchedResultsController?

    - by Phil Yates
    OK so I have two entities in my data model (let's say entityA and entityB), both of these entities have a to-many relationship to each other. I have setup a NSFetchedResultsController to fetch a bunch of entityA. Now I'm trying to have the section names for the tableview be the title of entityB. sectionNameKeyPath:@"entityB.title" Now this causes a problem, where by the section name returned from that relationship appears to be ({title1}) or ({title1,title2...titleN}) obviously depending on how many different entityB's are involved. This doesn't look great in a tableview and doesn't group the objects as I would like. What I would like is a section per entityB title with entityA appearing under each section, under multiple sections if necessary. I'm at a loss as how I am supposed to achieve this whether I need to update the predicate to get the entity to appear multiple times or whether I need to update the section and header functions to do some processing as the controller loops through the objects. Any help is appreciated :) Thanks

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  • Variable height UIViews and labels

    - by Bob Spryn
    Ok so I'm not in a table cell at this point. (I've seen a lot of threads regarding the height of cells.) I have a detail view with a title and description at the top of the view, followed by a tableView below it. If the description is going to vary in length, how do I get the tableView to adjust with it accordingly so it always starts directly below it? I see apple doing this in the app store application. If you look at an application description (as if you were going to buy it), they have an application description, and wherever that ends a scrolling pane of screenshots follow. How do they do the varying height on the text description like that? Are they doing this all programmatically or can I use the layout controls in IB to do the same thing?

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  • How do I allow users to dial numbers in my tableView cells?

    - by Griffo
    Hi all, I have a table containing cells with phone numbers. How can I allow the user to dial these numbers by tapping the row? It's not working by default and there's no option in interface builder like there is for uiwebviews so I imagine I need to programmatically tell the app to dial the number when the cell is tapped.

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  • Is NSDictionary key order guaranteed the same as initialized if it never changes?

    - by Thaurin
    I've run into the same problem as found in this question. However, I have a follow-up question. I seem to be in the same situation as the original asker: I have a plist with a hierarchy of dictionaries that define a configuration screen. These are not mutable and will stay the same throughout the application. Since the original discussion seems to focus on problems arising from mutating the dictionary, I must ask for comfirmation: is the order of a dictionary guaranteed the same as they are in the plist, i.e. as it is read (with initWithContentsOfFile)? Can I use allKeys on it in this case to get a correct-order array of keys if the dictionary never changes?

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  • Debuging to simulator crashes with "exited with status 5" unless I debug

    - by tigermain
    For some reason the app I am working on has very bad PMT! Literally! Most of the time I cannot debug using the simulator without putting a breakpoint in my AppDelegate. If I don't it exists with "status 5". If I put a break point in and simple continue it works perfectly well, it also works if I run the app in the simulator when not connected to the GDB. I have tried the source on a second machine with exactly the same results. I dont have this issue building to the device?!?!?! Thanks

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  • how to detect touch on UIView with UIimage ontop of it?

    - by Silent
    hello all, i want to use a UIview and a UIImage ontop of it with a text box and button i want the user to drag it when the UIview or anything in the view is touched, what would be the best way to implement this method? the UIView is on a single View Controller and using Interface Builder to make my UIviews and UIimages.

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