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  • Core Data 1-to-many relationship: List all related objects as section header in UITableView

    - by Snej
    Hi: I struggle with Core Data on the iPhone about the following: I have a 1-to-many relationship in Core Data. Assume the entities are called recipe and category. A category can have many recipes. I accomplished to get all recipes listed in a UITableView with section headers named after the category. What i want to achieve is to list all categories as section header, even those which have no recipe: category1 <--- this one should be displayed too category2 recipe_x recipe_y category3 recipe_z NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Recipe" inManagedObjectContext:managedObjectContext]; [fetchRequest setEntity:entity]; [fetchRequest setFetchBatchSize:10]; NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:@"category.categoryName" ascending:YES]; NSSortDescriptor *sortDescriptor2 = [[NSSortDescriptor alloc] initWithKey:@"recipeName" ascending:YES]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1,sortDescriptor2, nil]; [fetchRequest setSortDescriptors:sortDescriptors]; NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:@"category.categoryName" cacheName:@"Recipes"]; What is the most elegant way to achieve this with core data?

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  • How do you make a UIBarButtonItem animation flip?

    - by Andrew Arrow
    In the iPod app on the iPhone there is a UIBarButtonItem in the upper right toolbar that flips between the song and track listings for the album. When you select the button, the button itself does a flip animation. Is there a way to do this with: CGContextRef context = UIGraphicsGetCurrentContext(); [UIView beginAnimations:nil context:context]; [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromLeft forView:[self superview] cache:YES]; Do I need to make a UIBarButtonItem with initWithCustomView vs. initWithImage to achieve this?

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  • How can I sort by a transformable attribute in an NSFetchedResultsController?

    - by Mike Laurence
    I'm using NSValueTransformers to encrypt attributes (strings, dates, etc.) in my Core Data model, but I'm pretty sure it's interfering with the sorting in my NSFetchedResultsController. Does anyone know if there's a way to get around this? I suppose it depends on how the sort is performed; if it's always only performed directly on the database, then I'm probably out of luck. If it sorts on the objects themselves, then perhaps there's a way to activate the transformation before the sort occurs. I'm guessing it's directly on the database, though, since the sort would be key in grabbing subsets of the collection, which is the main benefit of NSFetchedResultsController anyway.

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  • Collection View Item binding issue

    - by Harry
    I have two entities in a Data Model, ENTITY_A, and ENTITY_B, that are related (ENTITY_A with a one-to-many relationship to ENTITY_B named DetailItems). I have set up a NSCollectionView with its appropriate bindings to ENTITY_A, and have placed on a Collection View Item a label. If I bind the label to [Collection View Item] and with a Model Key Path of [representedObject.FIELD_NAME], it works great. If I bind it to a Model Key Path [representedObject.DetailItems.@count], again it works great. If I bind it to a Model Key Path [[email protected]_NAME], I get the following error on the console: addObserver:forKeyPath:options:context:] is not supported. Key path: @sum.FIELD_NAME. Can anyone please help? Thank you, Harry

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  • UISearchBar cancel button color?

    - by cactus
    When I drop a UISearchBar into my view inside Interface Builder, and change its style to Black Opaque, the cancel button stays unfittingly blue / gray and doesn't become black. How can I make the cancel button black?

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  • Drawing RAW buffer to CGBitmapContext

    - by Raj
    Hi all, I have a raw image buffer in the RGB format. I need to draw it to CGContext so that I get a new buffer of the format ARGB. I accomplish this in the following way: Create a data provider out of raw buffer using CGDataProviderCreateWithData and then create image out of the data provider with the api: CGImageCreate. Now if I write this image back to the CGBitmapContext using CGContextImageDraw. Instead of creating an intermediate image, is there any way of writing the buffer directly to CGContext so that I can avoid the image creation phase? Thanks

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  • Gray border when using NSBorderlessWindowMask

    - by bare_nature
    Hello, Whenever I try to create a custom window using NSBorderlessWindowMask and set an NSView (for example an NSImageView) as its contentView, I get a 1px gray border around the NSView and I don't seem to be able to get rid of it. I have followed several approaches including Apple's RoundTransparentWindow sample code as well as several suggestions on StackOverflow. I suspect the gray border is either coming from the window itself or the NSView. Have any of you experienced this problem or do you have a possible solution? Thanks

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  • iPad UIColor Saturation Issues

    - by Carter Allen
    I am trying to draw a UIColor on the screen of a view-based app, and I am trying to do so using HSB. It is absolutely necessary for me to use HSB in this case. I can create a UIColor object with any S value from 0.0f to 0.75f, but past that the numerical changes have no effect on the actual saturation displayed. I need it to be 1.0f, but it is still using 0.75f. Any ideas on why it is doing that, and how I can make it work?

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  • iPhone image distortion

    - by Corey Floyd
    Are there any reasons why the simulator will display UIImageViews properly, but incorrectly on the iPhone? My Process: An image in a PNG file Start a UIGraphicsBeginImageContext() Draw the PNG in a CGrect Draw text in the CGRect Create an UIImage from the context Set the image of a UIImaveView to the UIImage Set the frame of the UIImageView to the size of the PNG Add as a subview Outcome: The image does not display correctly. The rightmost 1-3 pixels of the image is just a vertical white line. This occurs only on the device and not on the simulator. I can fix the problem, but only by increasing the size of the UIImageView. If I increase the size.height of the UIImageView by 1 pixel, it displays the UIImage correctly. Of course, these leaves the iPhone to scale my image before drawing it on screen which is not desirable. Any ideas why this occurs or any fixes for it? (I will post my code if needed)

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  • Removing all CALayer's sublayers

    - by radex
    Hi. I have trouble with deleting all layer's sublayers. I do this manually, but it's unwanted code clutter. I found many topics about this in google, but no answer. I tried to do something like this: for(CALayer *layer in rootLayer.sublayers) { [layer removeFromSublayer]; } but it didn't work. Also, i tried to clone rootLayer.sublayers into separate NSArray, but result was the same. Any ideas? regards, radex PS. sorry for my English. Edit: I thought it works now, but I was wrong. It works good with CALayers, but it doesn't work with CATextLayers. Any ideas?

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  • how can load images from plist in to UITableView ?

    - by srikanth rongali
    I have stored the videos and the thumbnail images of the videos in Documents folder. And I have given the path in plist. In plist I took an array and I added directories to the array. And in the dictionary I stored the image path /Users/srikanth/Library/Application Support/iPhone Simulator/User/Applications/9E6E8B22-C946-4442-9209-75BB0E924434/Documents/image1 for key imagePath. for video /Users/srikanth/Library/Application Support/iPhone Simulator/User/Applications/9E6E8B22-C946-4442-9209-75BB0E924434/Documents/video1.mp4 for key filePath. I used following code but it is not working. I am trying only for images. I need the images to be loaded in the table in each cell. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; [cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton]; UIImageView *image2 = [[UIImageView alloc]init]; image2.frame = CGRectMake(0.0f, 0.0f, 80.0f, 80.0f); image2.backgroundColor = [UIColor clearColor]; //image2.image = [UIImage imageNamed:@"snook.png"]; image2.tag = tag7; } NSDictionary *dictOfplist = [cells objectAtIndex:indexPath.row]; [(UIImageView *)[cell viewWithTag:tag7] setImage:[dictOfplist objectForKey:@"imagePath"]]; return cell; } - (void)viewDidLoad { [super viewDidLoad]; self.title = @"Library"; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(close:)]; NSString* plistPath = [[NSBundle mainBundle] pathForResource:@"details" ofType:@"plist"]; contentArray = [NSArray arrayWithContentsOfFile:plistPath]; cells = [[NSMutableArray alloc]initWithCapacity:[contentArray count]]; for(dCount = 0; dCount < [contentArray count]; dCount++) [cells addObject:[contentArray objectAtIndex:dCount]]; } How can I make this work. Thank you.

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  • Why does [NSOutlineView clickedRow] always return -1?

    - by jxpx777
    I have a fairly pedestrian non-editable NSOutlineView setup. In the bindings for the outline view, I have set the binding to my file's owner (MyDocument FWIW) with a selector of outlineViewWasDoubleClicked The method exists and is called, but when I call -clickedRow it consistently returns -1 rather than the row number of the row that I double clicked to trigger the method. My _outlineView is an IBOutlet and I've verified that it is hooked up correctly by using -selectedRow for the method rather than -clickedRow (I would rather use -clickedRow though because it seems unintuitive for the user to have a row selected, double click another row to do something with it and have the method triggered with the row they had selected.) My best guess right now is that the -clickedRow value is getting cleared out before my method fires, but I don't know where or what might be gobbling it up. Thanks in advance for any help.

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  • How to add Button in UINavigationController

    - by Ali
    Hi all , navigator=[[UINavigationController alloc]initWithRootViewController:contacts]; UIBarButtonItem *nextButton = [[UIBarButtonItem alloc] initWithTitle:@"Delete" style:UIBarButtonItemStyleBordered target:self action:@selector(makeCall)]; //[[self.navigator navigationItem] setLeftBarButtonItem:nextButton]; self.navigator.navigationBar.items=[NSArray arrayWithObject:nextButton]; I am adding a button to UINavigationController and got following exception please help me 2011-01-03 11:46:26.626 Appointment[2243:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Cannot call setItems:animated: directly on a UINavigationBar managed by a controller.' 2011-01-03 11:46:26.634 Appointment[2243:207] Stack: ( 3040

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  • UIView "suck" animation

    - by igul222
    I'd like to use the UIView "sucking" transition (view is "sucked" into a point) referenced here: http://iphonedevwiki.net/index.php/UIViewAnimationState#Using_suckEffect The method above, however, uses private APIs, which makes it next to useless for an App Store app. How can I recreate a similar effect without relying on private APIs? I'm guessing the answer has to do with OpenGL, although I have zero experience there.

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  • /usr/bin/codesign failed with exit code 1

    - by PF1
    Hi Everyone: I am attempting to deploy my first development iPhone app, and am running into some problems. I have successfully went though the online Provisioning Assistant, but now I am stuck. No matter what I do, I always get the following error. /usr/bin/codesign failed with exit code 1 Anyone have any ideas why this is happening?

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  • Does NSArray:lastObject return an autoreleased object?

    - by Kyle
    I'm working on an iPhone project where I would like to retrieve an object from an NSMutableArray, remove the object from the array and then use it later. The code looks something like this: NSMutableArray * array; // fill the array NSObject * obj = [array lastObject]; [array removeLastObject]; // do something with obj (in the same function) array is the only entity with a retain on the object that is being accessed. Is this safe to do? I would assume that this would only work if lastObject autoreleased the object which is something that I can't figure out if it does.

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  • Graceful degradation on iPhone

    - by Seva Alekseyev
    How do I write a program for iPhone (Objective C++) that runs on OS 2.0 but takes advantage of 3.0 features if they're available? Example: copy&paste (class UIPasteboard). Nice feature to have, but I don't want to kill backward compatibility. Do I compile against SDK v. 3 or v. 2? If the latter, how do I create an instance of UIPasteboard, considering it's not declared in the headers? If the former, won't some C-linkage functions cause "unresolved reference" upon loading under OS 2.0?

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  • Why Is Bottom Half of Custom UIActionSheet with UIDatePicker Disabled?

    - by Gorgando
    Everything seems to be working great with my UIActionSheet that contains a UIDatePicker except that the bottom half of the DatePicker is disabled. Visually there is a shadow that makes the bottom half of the picker darker than the top half. Everything in the bottom half is disabled and I can't for the life of me figure out how to enable it. I also noticed in my other "normal" UIActionSheets that just contain buttons, the bottom half of the cancel buttons are disabled. This is the code for my custom UIActionSheet: self.datePickerView = [[UIDatePicker alloc] init]; self.datePickerView.datePickerMode = UIDatePickerModeDate; self.actionSheet = [[UIActionSheet alloc] initWithTitle:@"Choose a Follow-up Date" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"Done", nil]; [self.actionSheet showInView:self.view]; [self.actionSheet addSubview:self.datePickerView]; [self.actionSheet sendSubviewToBack:self.datePickerView]; [self.actionSheet setBounds:CGRectMake(0,0,320, 500)]; CGRect pickerRect = self.datePickerView.bounds; pickerRect.origin.y = -95; self.datePickerView.bounds = pickerRect; I've tried several things including sendSubviewToBack, BringSubviewToFront, etc but I have not had any luck. I appreciate your help!

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