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  • UIAccelerationValue angle

    - by dragon
    Hi, - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration Using the above method we got an acceleration value of (x and y and z).Now i want to find angle between (x and y) and (y and z) and (z and x).How can i do this? Can anyone help me ? Thanks in advance.....

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  • Can't Reorder a UITableViewCell into _some_ empty sections of a UITableView

    - by Jeremy Lightsmith
    If I have a UITableView in edit mode, w/ reordering turned on, it seems I can't move some (but not all) cells into some (but not all) empty sections. For example, if I have this layout : Section 1 apple banana Section 2 doberman Section 3 Section 4 Then I can move 'doberman' into any slot in section 1 (except after 'banana'), but I can't move it into section 3 or 4 at all. On the other hand, I can move 'apple' & 'banana' into section section 2 (except after 'doberman'), and I CAN move it into section 3, but NOT into section 4. What gives? this seems like buggy behavior. How do people work around it? Is apple aware of this bug?

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  • Creating a mask from a graphics context

    - by Magic Bullet Dave
    I want to be able to create a greyscale image with no alpha from a png in the app bundle. This works, and I get an image created: // Create graphics context the size of the overlapping rectangle UIGraphicsBeginImageContext(rectangleOfOverlap.size); CGContextRef ctx = UIGraphicsGetCurrentContext(); // More stuff CGContextDrawImage(ctx, drawRect2, [UIImage imageNamed:@"Image 01.png"].CGImage); // Create the new UIImage from the context UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); However the resulting image is 32 bits per pixel and has an alpha channel, so when I use CGCreateImageWithMask it doesn't work. I've tried creating a bitmap context thus: CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGContextRef ctx =CGBitmapContextCreate(nil, rectangleOfOverlap.size.width, rectangleOfOverlap.size.height, 8, rectangleOfOverlap.size.width , colorSpace, kCGImageAlphaNone); UIGraphicsGetImageFromCurrentImageContext returns zero and the resulting image is not created. Am I doing something dumb here? Any help would be greatly appreciated. Regards Dave

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  • Who should call viewDidLoad on progammatically loaded views?

    - by Remus Rusanu
    When I need to load a view programatically I do the following: MyController* myController = [[MyController alloc] init]; [[NSBundle mainBundle] loadNibNamed:@"myNib" owner:myController options:nil]; // use my controller here, eg. push it in the nav controller This works fine, but my controller's viewDidLoad is never called. So I resorted to manually calling it after the loadNibNamed call, but it doesn't seem correct. I was expecting the framework to call the viewDidLoad on my behalf. Is this the right way or I'm missing something?

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  • Can't append space at end of UITextView

    - by Sam V
    I have a UITextView in which I want the initial value to be "@username " (notice the space after the username). This way the user can start typing right away without having to tap space. So I do: textView.text = [NSString stringWithFormat:@"@%@ ", username]; But it seems like it's impossible to have the UITextView text property ending with a space (it always gets stripped out). Am I correct? Is there any workaround for this? I tried using the \s char and no success.

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  • GKSession sendDataToAllPeers including sender?

    - by Typeoneerror
    I've got a number of devices connected over wifi using GameKit. I have a simple UIAlertView popping up when peers receive data. All but the sendee show this alert view when data is sent, so I'm wondering if that's a bug in my app or if that's expected behavior. If the device doing the sending is also a GKSessionModePeer, I would expect it to "fire" its receiveData: message as well since I'm sending to all peers. Should I call a method manually at the same on the sendee device? For example, if I wanted to send a "GameStart" packet to the 4 phones, the peers would call startGame: in the receiveData:fromPeer:inSession:context: method when it receives that packet and the sendee would be calling sendDataToAllPeers: and call startGame: on itself. Does that sound right or is there a way to include the sendee in the sendDataToAllPeers: list so that it responds exactly the same as all connected peers?

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  • Implementation of Nib project to Storyboard, Xcode

    - by Blake Loizides
    I have made a tabbed bar application in storyboard in xcode. I,m new to xcode. I got a Sample TableView XIB project from apple that I edited to my needs,The project has a UITableView that I Customized with Images, And with help of a certain forum member I was able to link up each image to a New View Controller. I tried to port or integrate My Nib Project Code to my StoryBoard Tabbed Bar Application.I thought I had everything right had to comment out a few things to get no errors, But the project only goes to a Blank Table View. Below are 2 links, 1 to my StoryBoard Tabbed Bar Application with the Table Code that I tried to integrate and the other My Successful Nib Project. Also is some code and pictures. If anybody has some free time and does not mind to help I would be extremely grateful for any input given. link1 - Storyboard link2 - XIB DecorsViewController_iPhone.m // // TableViewsViewController.m // TableViews // // Created by Axit Patel on 9/2/10. // Copyright Bayside High School 2010. All rights reserved. // #import "DecorsViewController_iPhone.h" #import "SelectedCellViewController.h" @implementation DecorsViewController_iPhone #pragma mark - Synthesizers @synthesize sitesArray; @synthesize imagesArray; #pragma mark - View lifecycle // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { // Load up the sitesArray with a dummy array : sites NSArray *sites = [[NSArray alloc] initWithObjects:@"a", @"b", @"c", @"d", @"e", @"f", @"g", @"h", nil]; self.sitesArray = sites; //[sites release]; UIImage *PlumTree = [UIImage imageNamed:@"a.png"]; UIImage *CherryRoyale = [UIImage imageNamed:@"b.png"]; UIImage *MozambiqueWenge = [UIImage imageNamed:@"c.png"]; UIImage *RoyaleMahogany = [UIImage imageNamed:@"d.png"]; UIImage *Laricina = [UIImage imageNamed:@"e.png"]; UIImage *BurntOak = [UIImage imageNamed:@"f.png"]; UIImage *AutrianOak = [UIImage imageNamed:@"g.png"]; UIImage *SilverAcacia = [UIImage imageNamed:@"h.png"]; NSArray *images = [[NSArray alloc] initWithObjects: PlumTree, CherryRoyale, MozambiqueWenge, RoyaleMahogany, Laricina, BurntOak, AutrianOak, SilverAcacia, nil]; self.imagesArray = images; //[images release]; [super viewDidLoad]; } #pragma mark - Table View datasource methods // Required Methods // Return the number of rows in a section - (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section { return [sitesArray count]; } // Returns cell to render for each row - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"CellIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; // Configure cell NSUInteger row = [indexPath row]; // Sets the text for the cell //cell.textLabel.text = [sitesArray objectAtIndex:row]; // Sets the imageview for the cell cell.imageView.image = [imagesArray objectAtIndex:row]; // Sets the accessory for the cell cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // Sets the detailtext for the cell (subtitle) //cell.detailTextLabel.text = [NSString stringWithFormat:@"This is row: %i", row + 1]; return cell; } // Optional // Returns the number of section in a table view -(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView { return 1; } #pragma mark - #pragma mark Table View delegate methods // Return the height for each cell -(CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return 78; } // Sets the title for header in the tableview -(NSString *) tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return @"Decors"; } // Sets the title for footer -(NSString *) tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section { return @"Decors"; } // Sets the indentation for rows -(NSInteger) tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath { return 0; } // Method that gets called from the "Done" button (From the @selector in the line - [viewControllerToShow.navigationItem setRightBarButtonItem:[[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissView)] autorelease]];) - (void)dismissView { [self dismissViewControllerAnimated:YES completion:NULL]; } // This method is run when the user taps the row in the tableview - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [tableView deselectRowAtIndexPath:indexPath animated:YES]; SelectedCellViewController *viewControllerToShow = [[SelectedCellViewController alloc] initWithNibName:@"SelectedCellViewController" bundle:[NSBundle mainBundle]]; [viewControllerToShow setLabelText:[NSString stringWithFormat:@"You selected cell: %d - %@", indexPath.row, [sitesArray objectAtIndex:indexPath.row]]]; [viewControllerToShow setImage:(UIImage *)[imagesArray objectAtIndex:indexPath.row]]; [viewControllerToShow setModalPresentationStyle:UIModalPresentationFormSheet]; [viewControllerToShow setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal]; [viewControllerToShow.navigationItem setRightBarButtonItem:[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissView)]]; UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewControllerToShow]; viewControllerToShow = nil; [self presentViewController:navController animated:YES completion:NULL]; navController = nil; // UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Tapped row!" // message:[NSString stringWithFormat:@"You tapped: %@", [sitesArray objectAtIndex:indexPath.row]] // delegate:nil // cancelButtonTitle:@"Yes, I did!" // otherButtonTitles:nil]; // [alert show]; // [alert release]; } #pragma mark - Memory management - (void)didReceiveMemoryWarning { NSLog(@"Memory Warning!"); [super didReceiveMemoryWarning]; } - (void)viewDidUnload { self.sitesArray = nil; self.imagesArray = nil; [super viewDidUnload]; } //- (void)dealloc { //[sitesArray release]; //[imagesArray release]; // [super dealloc]; //} //@end //- (void)viewDidUnload //{ // [super viewDidUnload]; // Release any retained subviews of the main view. //} - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } else { return YES; } } @end DecorsViewController_iPhone.h #import <UIKit/UIKit.h> @interface DecorsViewController_iPhone : UIViewController <UITableViewDelegate, UITableViewDataSource> { NSArray *sitesArray; NSArray *imagesArray; } @property (nonatomic, retain) NSArray *sitesArray; @property (nonatomic, retain) NSArray *imagesArray; @end SelectedCellViewController.m #import "SelectedCellViewController.h" @implementation SelectedCellViewController @synthesize labelText; @synthesize image; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) { } return self; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } #pragma mark - View lifecycle - (void)viewDidLoad { [super viewDidLoad]; [label setText:self.labelText]; [imageView setImage:self.image]; } - (void)viewDidUnload { self.labelText = nil; self.image = nil; // [label release]; // [imageView release]; [super viewDidUnload]; } - (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } @end SelectedCellViewController.h @interface SelectedCellViewController : UIViewController { NSString *labelText; UIImage *image; IBOutlet UILabel *label; IBOutlet UIImageView *imageView; } @property (nonatomic, copy) NSString *labelText; @property (nonatomic, retain) UIImage *image; @end

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  • Objective-C Decimal to Base 16 Hex conversion

    - by JustinXXVII
    Does anyone have a code snippet or a class that will take a long long and turn it into a 16 byte Hex string? I'm looking to turn data like this long long decimalRepresentation = 1719886131591410351; and turn it into this //Base 16 Hex Output: 17DE435307A07300 The %x operator doesn't want to work for me NSLog(@"Hex: %x",decimalRepresentation); //console : "Hex: 7a072af" As you can see that's not even close. Any help is truly appreciated!

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  • How to make a blue button with white text?

    - by Bonnie
    // Make text white... and background blue [myButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [myButton setBackgroundColor:[UIColor blueColor]]; Should that make a button with white text... and a blue background? It doesn't.

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  • How to judge the color of UILabel?

    - by william-hu
    UILabel *templabel = [self.wallBoxArray objectAtIndex:i]; for( int i = 0 ; i < [self.wallBoxArray count]; i++) { if(templabel.backgroundColor == [UIColor greenColor]) { NSLog(@"the color isn green"); } } There are many label's in my array. They all initialized with green color. But i judged that way ,why cant print " the color isn't green.Thank you.

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  • How i find the greatest number from six or more digit number?

    - by Rajendra Bhole
    Hi,thanks in advance, I have the code in which i want to find out the greatest number from six numbers, the code as follows, if( (pixels->r == 244 || pixels->g == 242 || pixels->b == 245) || (pixels->r == 236 || pixels->g == 235 || pixels->b == 233) || (pixels->r == 250 || pixels->g == 249 || pixels->b == 247) || (pixels->r == 253 || pixels->g == 251 || pixels->b == 230) || (pixels->r == 253 || pixels->g == 246 || pixels->b == 230) || (pixels->r == 254 || pixels->g == 247 || pixels->b == 229)) { numberOfPixels1++; NSLog( @"Pixel data1 %d", numberOfPixels1); } if( (pixels->r == 250 || pixels->g == 240 || pixels->b == 239) ||(pixels->r == 243 || pixels->g == 234 || pixels->b == 229) || (pixels->r == 244 || pixels->g == 241 || pixels->b == 234) || (pixels->r == 251 || pixels->g == 252 || pixels->b == 244) || (pixels->r == 252 || pixels->g == 248 || pixels->b == 237) || (pixels->r == 254 || pixels->g == 246 || pixels->b == 225)) { numberOfPixels2++; NSLog( @"Pixel data2 %d", numberOfPixels2); } if( (pixels->r == 255 || pixels->g == 249 || pixels->b == 225) ||(pixels->r == 255 || pixels->g == 249 || pixels->b == 225) || (pixels->r == 241 || pixels->g == 231 || pixels->b == 195) || (pixels->r == 239 || pixels->g == 226 || pixels->b == 173) || (pixels->r == 224 || pixels->g == 210 || pixels->b == 147) || (pixels->r == 242 || pixels->g == 226 || pixels->b == 151)) { numberOfPixels3++; NSLog( @"Pixel data3 %d", numberOfPixels3); } if( (pixels->r == 235 || pixels->g == 214 || pixels->b == 159) ||(pixels->r == 235 || pixels->g == 217 || pixels->b == 133) || (pixels->r == 227 || pixels->g == 196 || pixels->b == 103) || (pixels->r == 225 || pixels->g == 193 || pixels->b == 106) || (pixels->r == 223 || pixels->g == 193 || pixels->b == 123) || (pixels->r == 222 || pixels->g == 184 || pixels->b == 119)) { numberOfPixels4++; NSLog( @"Pixel data4 %d", numberOfPixels4); } if( (pixels->r == 199 || pixels->g == 164 || pixels->b == 100) ||(pixels->r == 188 || pixels->g == 151 || pixels->b == 98) || (pixels->r == 156 || pixels->g == 107 || pixels->b == 67) || (pixels->r == 142 || pixels->g == 88 || pixels->b == 62) || (pixels->r == 121 || pixels->g == 77 || pixels->b == 48) || (pixels->r == 100 || pixels->g == 49 || pixels->b == 22)) { numberOfPixels5++; NSLog( @"Pixel data5 %d", numberOfPixels5); } if( (pixels->r == 101 || pixels->g == 48 || pixels->b == 32) ||(pixels->r == 96 || pixels->g == 49 || pixels->b == 33) || (pixels->r == 87 || pixels->g == 50 || pixels->b == 41) || (pixels->r == 64 || pixels->g == 32 || pixels->b == 21) || (pixels->r == 49 || pixels->g == 37 || pixels->b == 41) || (pixels->r == 27 || pixels->g == 28 || pixels->b == 46)) { numberOfPixels6++; NSLog( @"Pixel data6 %d", numberOfPixels6); } I have to find out greatest from numberOfPixels1....numberOfPixels6 from above code. There are any optimum way to find out the greatest number?

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  • Line breaks in "NSString"s returned from PList don't work.

    - by Moshe
    I've seen this post: http://stackoverflow.com/questions/2035567/nsstring-newline-escape-in-plist but I'd like to know if there's a way to pragmatically render \n line breaks. I'm currently using: decisionText.text = [NSString stringWithFormat: (@"%@", [replies objectAtIndex:(arc4random() % [replies count])])]; Which randomly grabs a String from the replies array. The array was loaded from a plist like so: replies = [[NSMutableArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"AdviceList" ofType:@"plist"]]; What am I missing? The answer can't be to manually enter line breaks. That's not programming! (Sounds like word processing to me.)

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  • Custom UITableviewcell, CGGradient still shows when cell is selected?

    - by Burnsoft Ltd
    I'm using a custom tableview cell (like Tweetie's fast scrolling) i've added a gradient to the context, which looks really nice, but when I select the cell, the gradient is still visible. I'm not sure how to go about removing the gradient when the cell is selected? any ideas? cheers Nik - (void)drawContentView:(CGRect)r { CGContextRef context = UIGraphicsGetCurrentContext(); UIColor *backgroundColor = [UIColor whiteColor]; UIColor *textColor = [UIColor blackColor]; UIColor *dateColor = [UIColor colorWithRed:77.f/255.f green:103.f/255.f blue:155.f/255.f alpha:1]; if(self.selected) { backgroundColor = [UIColor clearColor]; textColor = [UIColor whiteColor]; } [backgroundColor set]; CGContextFillRect(context, r); //add gradient CGGradientRef myGradient; CGColorSpaceRef myColorspace; size_t num_locations = 2; CGFloat locations[2] = {0.0, 1.0}; CGFloat components[8] = {0.9f, 0.9f, 0.9f, 0.7f, // Bottom Colour: Red, Green, Blue, Alpha. 1.0f, 1.0f, 1.0f, 1.0}; // Top Colour: Red, Green, Blue, Alpha. myColorspace = CGColorSpaceCreateDeviceRGB(); myGradient = CGGradientCreateWithColorComponents (myColorspace, components, locations, num_locations); CGColorSpaceRelease(myColorspace); CGPoint startPoint, endPoint; startPoint.x = 0; startPoint.y = self.frame.size.height; endPoint.x = 0; endPoint.y = self.frame.size.height-15; // just keep the gradient static size, never mind how big the cell is CGContextDrawLinearGradient (context, myGradient, startPoint, endPoint, 0); CGGradientRelease(myGradient); //gradient end //rest of custom drawing goes here.... } Should I be doing something in the if cell selected code?

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  • When is Facebook Connect supposed to call its delegate methods?

    - by RickiG
    Hi The Facebook connect code is eluding me a bit. I have no problem doing a login, and a wall post, however, I simply can not figure out how the delegate methods for the FBDialog andFBStreamDialog is supposed to work. - (void)postToWall { FBStreamDialog *dialog = [[[FBStreamDialog alloc] init] autorelease]; dialog.delegate = self; dialog.userMessagePrompt = @"Enter your message:"; dialog.attachment = [NSString stringWithFormat:@"JSONpost code"]; [dialog show]; } I adhere to these protocols in my controller: <FBDialogDelegate, FBSessionDelegate, FBRequestDelegate> I then implement the two methods: - (void) dialogDidCancel:(FBDialog *)dialog { NSLog(@"Failed"); } - (void) dialogDidSucceed:(FBDialog *)dialog { NSLog(@"Success"); } After I tap "publish" and the postToWall methods is done executing the Facebook "pop up" in the UI is empty, except a small "X" in the top right corner and a "F" (facebook logo) in the top left corner. The UI will stay there until I tap the "X", this results in the dialogDidCancel delegate method being called. The post data is showing up on the Facebook page, everything seems to work. Why is thedialogDidSucceedmethod never called? I need this to release my facebook controller and restore the UI back to where the user was before "starting" FB Connect. Thank You:)

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  • Best XML Parser for RSS Feeds in Objective C ?

    - by Ansari
    Hi all, I am going to develop an application which will parse the RSS feeds and display the items in my custom cell.(Cell containing the image, label, description, etc). The most popular way of parsing is using the NSXMLParser. But this is bit of a lengthy way. So is there any other way to do this. Or my question will be, which is the best xml parser for objective-c ?

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  • Why would JmDNS service discovery work on a Motorola Droid running Android 2.1-update1 and not on an

    - by Churlbong
    I have successfully gotten JmDNS working on Android 2.1 testing on a Motorola Droid by using MulticastLock, but recently got an HTC Incredible as second test device, and JmDNS discovery doesn't work at all. I should mention that broadcasting a service still works and everything appears to run normally, but serviceAdded() never gets called. Does anyone have thoughts on why this might be? I was thinking it might be a permission issue, but I don't get any exceptions...

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  • custom cells uitableview - cannot display all the rows

    - by Matt Facer
    Hi guys, I'm creating a uitableview with custom cells which I created in Interface Builder. There are currently three cells (UITableViewCell). I have a UITableView which is on the view. The code I have is fairly standard, but I cannot work out how to actually SHOW the three custom cells. I am using the cellForRowAtIndexPath method. My aim is to get a grouped uitableview which shows like the following Item - Name Settings - alert - time So the above indented view should be my grouped uitableview. The problem is, I cannot get it to show using code. The uitableview will ALWAYS be this. I am trying to replicate the settings style screen... so I do not have any arrays to display the uitableview cells. How do I actually display my three cells? I have the following code - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 2; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { if (section == 0) return 1; else return 2; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if(section == 0) return @"Item"; else return @"Settings"; } So all I need to know is how to actually display my custom cells inside the tableview! Thanks for any information. I've searched for AGES in google .. all the tutorials use arrays to display data!

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  • popToRootViewControllerAnimated and dealloc all views

    - by mongeta
    Hello again, I have a UINavigationController that asks for some information and the user navigates until the end, once there, they can Accept or Cancel all the data that has been entered. It doesn't matter wich option they choose, as they always will go to the first view using [UINavigationController popToRootViewControllerAnimated:] The question is, how I can release/deallocate all the views ? For example, they start for view 1 and the end is at view 8, once they go directly to the 1 from the 8, how I can release view 2,3,4,5,6,7,8 ? thanks, regards, m.

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  • Need some guidelines on iPad animation programming

    - by thomasvsundert
    Hi, I'm creating an interactive e-book for the iPad. This book will contain multiple pages that will consist of a lot of animations (frame and motion animations), transitions,... I was wondering what my development options are, should I use OpenGL, Quartz,...? I've use UIImageView.animationImages before and found that it had really bad performance. What's the best way to draw frame based animations? Does anybody have some good pointers to resources on this? thanks in advance, Thomas

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  • Why aren't my objects sorting with sortedArrayUsingDescriptors?

    - by clozach
    I expected the code below to return the objects in imageSet as a sorted array. Instead, there's no difference in the ordering before and after. NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"imageID" ascending:YES]; NSSet *imageSet = collection.images; for (CBImage *image in imageSet) { NSLog(@"imageID in Set: %@",image.imageID); } NSArray *imageArray = [[imageSet allObjects] sortedArrayUsingDescriptors:(descriptor, nil)]; [descriptor release]; for (CBImage *image in imageArray) { NSLog(@"imageID in Array: %@",image.imageID); } Fwiw, CBImage is defined in my core data model. I don't know why sorting on managed objects would work any differently than on "regular" objects, but maybe it matters. As proof that @"imageID" should work as the key for the descriptor, here's what the two log loops above output for one of the sets I'm iterating through: 2010-05-05 00:49:52.876 Cover Browser[38678:207] imageID in Array: 360339 2010-05-05 00:49:52.876 Cover Browser[38678:207] imageID in Array: 360337 2010-05-05 00:49:52.877 Cover Browser[38678:207] imageID in Array: 360338 2010-05-05 00:49:52.878 Cover Browser[38678:207] imageID in Array: 360336 2010-05-05 00:49:52.879 Cover Browser[38678:207] imageID in Array: 360335 ... For extra credit, I'd love to get a general solution to troubleshooting NSSortDescriptor troubles (esp. if it also applies to troubleshooting NSPredicate). The functionality of these things seems totally opaque to me and consequently debugging takes forever.

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  • how to make a NEWS -Reader app

    - by exiang
    hey, I'm a beginner and I'm trying to make a NEWS reader app. My idea is to make an app just like N.Y Times. The question is : how do I access the news database and display on my native app ? If I make an RSS reader kinda thing, will I be able to display the contents of the news feed on my native app itself ? Please, I'v been reading and trying different tactics but not really getting anywhere close to what I want. A simple tip from you guys could really help me. thx

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  • Anyone knows of a good addressbook implementation?

    - by Tsahi Levent-Levi
    I am looking to add an address book to one of my programs. For that purpose, I want to have something that is flexible and customizable to the point of allowing me to hook up additional metadata to contacts in it from third parties. I don't mind paying for a solution as long as I get something that is usable for me. My requirements: Optimized to run on embedded devices Preferably in source code form Ability to add my own fields to contacts over those the address book provides out of the box Ability to plugin "stuff" to it to enhance it without changing its base code too much Has a C or C++ interface

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