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  • Creating your own UTI for an iOS app.

    - by Kalle
    Hello all, The app I'm developing has a custom file format for its files, and I'd like to be able to use the "Open In ..." feature of iOS which lets users e.g. email each other a file and then open it directly in the app. I've gotten as far as adding the CFBundleDocumentType stuff in the Info.plist file, but the problem is the LSItemContentTypes. From what I've read, I need to provide the actual file as a UTI, rather than just saying ".myfileextension", and I can't find a lot about how to create UTI's in a iOS app. Anyone know?

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  • A NSMutableArray is destroying my life!

    - by camilo
    EDITED to show the relevant part of the code Hi. There's a strange problem with an NSMutableArray which I'm just not understanding... Explaining: I have a NSMutableArray, defined as a property (nonatomic, retain), synthesized, and initialized with 29 elements. realSectionNames = [[NSMutableArray alloc] initWithCapacity:29]; After the initialization, I can insert elements as I wish and everything seems to be working fine. While I'm running the application, however, if I insert a new element in the array, I can print the array in the function where I inserted the element, and everything seems ok. However, when I select a row in the table, and I need to read that array, my application crashes. In fact, it cannot even print the array anymore. Is there any "magical and logical trick" everybody should know when using a NSMutableArray that a beginner like myself can be missing? Thanks a lot. I declare my array as realSectionNames = [[NSMutableArray alloc] initWithCapacity:29]; I insert objects in my array with [realSectionNames addObject:[category categoryFirstLetter]]; although I know i can also insert it with [realSectionNames insertObject:[category categoryFirstLetter] atIndex:i]; where the "i" is the first non-occupied position. After the insertion, I reload the data of my tableView. Printing the array before or after reloading the data shows it has the desired information. After that, selecting a row at the table makes the application crash. This realSectionNames is used in several UITableViewDelegate functions, but for the case it doesn't matter. What truly matters is that printing the array in the beginning of the didSelectRowAtIndexPath function crashes everything (and of course, doesn't print anything). I'm pretty sure it's in that line, for printing anything he line before works (example): NSLog(@"Anything"); NSLog(@"%@", realSectionNames); gives the output: 2010-03-24 15:16:04.146 myApplicationExperience[3527:207] Anything [Session started at 2010-03-24 15:16:04 +0000.] GNU gdb 6.3.50-20050815 (Apple version gdb-967) (Tue Jul 14 02:11:58 UTC 2009) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i386-apple-darwin".sharedlibrary apply-load-rules all Attaching to process 3527. Still not understanding what kind of stupidity I've done this time... maybe it's not too late to follow the career of brain surgeon?

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  • Including a NSUserDefault password test in 1st Tab.m to load a loginView gives eror?

    - by Michael Robinson
    I have a name and password in NSUserDefaults for login. I have this in my 1stTab View.m class to test for presence and load a login/signup loginView.xib modally if there is no password or name stored in the app. Here is the pulling of the defaults: -(void)refreshFields { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; usernameLabel.text = [defaults objectForKey:kUsernameKey]; passwordLabel.text = [defaults objectForKey:kPasswordKey]; { Here is the Test: - (void)viewDidAppear:(BOOL)animated { [self refreshFields]; [super viewDidAppear:animated]; if ([usernameLabel.text length] == 0 || [passwordLabel.text length] == 0) { LoginViewController * vc = [[[LoginViewController alloc] initWithNibName:@"LoginView" bundle:nil] autorelease]; [self presentModalViewController:vc animated: false]; } else { [[self tableView ]reloadData]; } } Thanks in advance, I'm getting this error in the console: * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key usernameLabel.'

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  • UIWebView or Custom UIView

    - by dinoc
    I have a dilemma and was wondering if anyone else had this issue. I have a Navigation based app that when you drill down to the last level, that last view has lots and lots of information and details. I am wondering if I should just use a UIWebView to display the details of information or if I should create a custom UIView with all the labels and outlets set in that UIView. Which way is recommended or the preferred way of doing something like this?

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  • Where I should call [object release] ?

    - by mongeta
    Hello, I've subclassed some UITextField and added some custom properties. In a UITableViewController, in the ViewDiDLoad I init them, and in the cellForRowAtIndexPath I add them to the cell with [cell.contentView addSubview:customTextField]; Each cell has a different customTextField as all of them are very different. Where I should call the [customTextField release] ? After I add them to the cell view ? If for example I call [self.tableView reloadData] my customTextField are going to be added again to the cell, so maybe I should change my approach in doing this ? thanks for the orientation ... regards, r.

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  • Does this have to be released?

    - by NextRev
    I've done a lot of research on when it's correct to release things, but it's all confusing to me. I think sometimes the Leaks program is off. Anyway... background is a UIImageView background.image = [UIImage imageNamed:@"greenbackground.png"]; Do I have to release background? I never alloced it and it's not set as a property, so I'm thinking no.

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  • How to have a UISwipeGestureRecognizer AND UIPanGestureRecognizer work on the same view

    - by Shizam
    How would you setup the gesture recognizers so that you could have a UISwipeGestureRecognizer and a UIPanGestureRecognizer work at the same time? Such that if you touch and move quickly (quick swipe) it detects the gesture as a swipe but if you touch then move (short delay between touch & move) it detects it as a pan? I've tried various permutations of requireGestureRecognizerToFail and that didn't help exactly, it made it so that if the SwipeGesture was left then my pan gesture would work up, down and right but any movement left was detected by the swipe gesture.

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  • Play sound when UIScrollView is scrolling

    - by Chonch
    Hey, I have a scroll view that can be scrolled to the sides (only left and right, not up and down). I want to play a short sound (less than a second) whenever the scroll view is moved X pixels to either side. How can this be done? Code samples will be greatly appreciated... Thanks,

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  • How to sum up a fetched result's number property based on the object's category?

    - by mr_kurrupt
    I have a NSFetchRequest that is returning all my saved objects (call them Items) and storing them in an NSMutableArray. Each of these Items have a category, an amount, and some other properties. My goal is to check the category of each Item and store the sum of the amounts for objects of the same category. So if I had these Items: Red; 10.00 Blue; 20.00 Green; 5.00 Red; 5.00 Green; 15.00 then I would have an array or other type of container than has: Red; 15.00 Blue; 20.00 Green; 20.00 What would be the best way to organize the data in such a manner? I was going to create a object class (call it Totals) that just has the category and amount. As I traverse through the fetch results in a for-loop, add Items with the same category in a Totals object an store them in a NSMutableArray. The problem I ran into with that is that I'm not sure how to check if an array contains a Totals object with a specific property. Specifically, a category that already exists. So if 'Red' exists, add the amount to it, otherwise create a new Totals object with category 'Red' and a the first Item's amount. Thanks.

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  • UIActivityView and blocking

    - by Rob Bonner
    Hello, I have a section of code that uploads an image: [activity startAnimating]; [self uploadImage:img Session_id:appDelegate.sessionID PlaceID:place.placeID Comment:comment.text]; [activity stopAnimating]; I am sure that activity is wired up correctly to a UIActivityViewIndicator, but it never shows. Inside the uploadImage function, I open a connection to the server and start the upload. Does anyone have an example or possible explanation as to why the activity view would not display?

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  • Will Apple reject my app if I do not do this?

    - by mystify
    From the documentation of UITableView / UITableViewController: If you decide to use a UIViewController subclass rather than a subclass of UITableViewController to manage a table view, you should perform a couple of the tasks mentioned above to conform to the human-interface guidelines. To clear any selection in the table view before it’s displayed, implement the viewWillAppear: method to clear the selected row (if any) by calling deselectRowAtIndexPath:animated:. After the table view has been displayed, you should flash the scroll view’s scroll indicators by sending a flashScrollIndicators message to the table view; you can do this in an override of the viewDidAppear: method of UIViewController. So lets say I do my custom stuff here and I do not flash the scroll indicator, and I do not reset the selection (which I think is wrong anyways, the user wants to know from where he came from). Will they reject it?

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  • How To Load Images into Custom UITableViewCell?

    - by Clifton Burt
    This problem is simple, but crucial and urgent. Here's what needs to be done: load 66px x 66px images into the table cells in the MainViewController table. each TableCell has a unique image. But how? Would we use cell.image?... cell.image = [UIImage imageNamed:@"image.png"]; If so, where? Is an if/else statement required? Help? Here's the project code, hosted on Google Code, for easy and quick reference... http://www.google.com/codesearch/p?hl=en#Fcn2OtVUXnY/trunk/apple-sample-code/NavBar/NavBar/MyCustomCell.m&q=MyCustomCell%20lang:objectivec To load each cell's labels, MainViewController uses an NSDictionary and NSLocalizedString like so... //cell one menuList addObject:[NSDictionary dictionaryWithObjectsAndKeys: NSLocalizedString(@"PageOneTitle", @""), kTitleKey, NSLocalizedString(@"PageOneExplain", @""), kExplainKey, nil]]; //cell two menuList addObject:[NSDictionary dictionaryWithObjectsAndKeys: NSLocalizedString(@"PageOneTitle", @""), kTitleKey, NSLocalizedString(@"PageOneExplain", @""), kExplainKey, nil]]; ... // this is where MainViewController loads the cell content - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { MyCustomCell *cell = (MyCustomCell*)[tableView dequeueReusableCellWithIdentifier:kCellIdentifier]; if (cell == nil) { cell = [[[MyCustomCell alloc] initWithFrame:CGRectZero reuseIdentifier:kCellIdentifier] autorelease]; } ... // MyCustomCell.m adds the subviews - (id)initWithFrame:(CGRect)aRect reuseIdentifier:(NSString *)identifier { self = [super initWithFrame:aRect reuseIdentifier:identifier]; if (self) { // you can do this here specifically or at the table level for all cells self.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // Create label views to contain the various pieces of text that make up the cell. // Add these as subviews. nameLabel = [[UILabel alloc] initWithFrame:CGRectZero]; // layoutSubViews will decide the final frame nameLabel.backgroundColor = [UIColor clearColor]; nameLabel.opaque = NO; nameLabel.textColor = [UIColor blackColor]; nameLabel.highlightedTextColor = [UIColor whiteColor]; nameLabel.font = [UIFont boldSystemFontOfSize:18]; [self.contentView addSubview:nameLabel]; explainLabel = [[UILabel alloc] initWithFrame:CGRectZero]; // layoutSubViews will decide the final frame explainLabel.backgroundColor = [UIColor clearColor]; explainLabel.opaque = NO; explainLabel.textColor = [UIColor grayColor]; explainLabel.highlightedTextColor = [UIColor whiteColor]; explainLabel.font = [UIFont systemFontOfSize:14]; [self.contentView addSubview:explainLabel]; //added to mark where the thumbnail image should go imageView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 66, 66)]; [self.contentView addSubview:imageView]; } return self; } HELP?

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  • UIImageView in UITableCell gets a weird size

    - by Behlül
    Hi, I'm trying to place a UIImageView in a UITableViewCell. I create a special view called ProductView. In that view, I have several components, one of them being a UIImageView. I set this ProductView as content view of the UITableViewCell. Everything is drawn properly except the UIImageView. UIImageView gets scaled meaninglessly. It's height gets twice the height of the table cell size. I've spent hours trying to solve this problem. I've set the frame of UIImageView manually, I've called drawRect method of UIImage in UIImageView, neither of them worked. I'm thinking of replacing UITableView with a UIScrollView if I can't find a solution. Does anyone know how to solve this problem?

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  • Get String Instead of Source - Xcode Cocoa

    - by Kevin
    Hello everyone, I have a program that will scan the contents of a website, and display it in a textbox. The problem is that it shows the html source. For example if my html code was: <html> <body> <p>Hello</p> </body> </html> instead of just showing hello, it'll show the code above... How can I get my objective c program to just read the hello, and not the html source.. I was assuming that it was the encoding when reading the website, but I might be possibly wrong.. I would greatly appreciate it if someone could give me a reasonable answer.. Best Regards, Kevin

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  • Displaying very large images on the iPad

    - by Brodie4598
    I need to display some very large images on the iPad. The files are jpgs and are about 6700x2700 (maps). Is there any way around loading the entire image into memory? Currently I load it int a scroll view for zooming/panning. The images are stored locally on the device.

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  • UIScrollView does not scroll

    - by Preston Cheung
    I got a problem about UIScrollView. I am making a custom view which inherits UIView. The view has a UIScrollView on which there are lots of buttons which should scroll left and right. The UIScrollView and buttons can show normally. But I cannot scroll the buttons. Could someone give me some suggestions? Thanks a lot! MZMPhotoCalenderSwitcher.h #import <UIKit/UIKit.h> @interface MZMPhotoCalenderSwitcher : UIView <UIScrollViewDelegate> @property (strong, nonatomic) UIScrollView *topSwitcher; @end MZMPhotoCalenderSwitcher.m - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.topSwitcher = [[UIScrollView alloc] initWithFrame:CGRectMake(0, LABEL_HEIGHT + VIEW_Y, self.view.bounds.size.width, TOP_SWITCHER_HEIGHT)]; self.topSwitcher.backgroundColor = [UIColor greenColor]; self.topSwitcher.pagingEnabled = YES; self.topSwitcher.showsHorizontalScrollIndicator = NO; self.topSwitcher.showsVerticalScrollIndicator = NO; [self add:3 ButtonsOnView:self.topSwitcher withButtonWidth:44.8f andHeight:20.0f]; } - (void)add:(int)num ButtonsOnView:(UIScrollView *)view withButtonWidth:(CGFloat)width andHeight:(CGFloat)height { CGFloat totalTopSwitcherWidth = num * width; [view setContentSize:CGSizeMake(totalTopSwitcherWidth, view.bounds.size.height)]; CGFloat xOffset = 0.0f; for (int i=1; i<=num; i++) { UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button setFrame:CGRectMake(xOffset, 0, width, height)]; xOffset += width; [button setTitle:[NSString stringWithFormat:@"%d", i] forState:UIControlStateNormal]; button.titleLabel.font = [UIFont systemFontOfSize:10]; [button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal]; [button setTitleColor:[UIColor blackColor] forState:UIControlStateSelected]; [button setTag:i]; [button addTarget:self action:@selector(buttonEvent) forControlEvents:UIControlEventTouchUpInside]; if (i % 2 == 0) [button setBackgroundColor:[UIColor yellowColor]]; else [button setBackgroundColor:[UIColor redColor]]; [view addSubview:button]; } }

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  • Animated status bar style transition, a la iPod app

    - by Ben Williamson
    In the iPod app, the navigation views have the default status bar style, and the Now Playing view is in the black style. The transition between them is animated with a crossfade. I want to do that. My first attempt: [UIView beginAnimations:@"whatever" context:nil]; [UIView setAnimationDuration:0.5]; self.navigationController.navigationBar.barStyle = UIBarStyleBlack; [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlack [UIView commitAnimations]; No joy, it pops to black. Takers?

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  • Change the state of a customized button (button with an image)?

    - by Harry Pham
    I know how to change the state of the regular button, as well as change the background color of a regular button. However, what I have is a image lay on top of a button (customized button). I want, when the user click on it, something visually would happen to let the user know that button is selected, and when the user click again it go back to the regular state. I try to change the background of the button, but it doesnt work since the image kind of cover the button. Any idea?

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  • using NSString + stringWithContentsOfFile:usedEncoding:error:

    - by Sergey
    Hello, all! I've got problem with use + stringWithContentsOfFile:usedEncoding:error: My problem in usedEncoding:(NSStringEncoding *)enc I don't know how can i set pointer to encoding. If i make it - programm is fail. For example, in similar function we have encoding:(NSStringEncoding)enc - without pointer! I want loading file (file has encoding ISOLatin1) in NSString and use NSString as UTF8String. how can i make it ? thanks.

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  • Core Data confusion: fetch without tableview.

    - by Mr. McPepperNuts
    I have completed and reproduced Core Data tutorials using a tableview to display contents. However, I want to access an Entity through a fetch on a view without a tableview. I used the following fetch code, but the count returned is always 0. The data exists when the database is opened using SQLite tools. NSManagedObject *entryObj; XYZDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; NSManagedObjectContext *managedObjectContext = appDelegate.managedObjectContext; NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Quote" inManagedObjectContext:managedObjectContext]; NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"id" ascending:YES]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; [request setSortDescriptors:sortDescriptors]; [request setEntity: entity]; NSArray *results = [managedObjectContext executeFetchRequest:request error:nil]; if (results == nil) { NSLog(@"No results found"); entryObj = nil; }else { NSLog(@"results %d", [results count]); } [request release]; [sortDescriptors release]; count returned is always 0; it should be 5. Can anyone point me to a reference or tutorial regarding creating a controller not to be used with a tableview.

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  • Using Kal calendar without doing the initialization (and so on) in the AppDelegate

    - by testing
    I'm using the Kal calendar. For the code shown below I'm referring to the Holiday example. In this example the allocation and initialization of Kal is done in the applicationDidFinishLaunching in the AppDelegate. The UITableViewDelegate protocol (e.g. didSelectRowAtIndexPath) is also positioned in the AppDelegate class. The AppDelegate: #import "HolidayAppDelegate.h" #import "HolidaySqliteDataSource.h" #import "HolidaysDetailViewController.h" ## Heading ###import "Kal.h" @implementation HolidayAppDelegate @synthesize window; - (void)applicationDidFinishLaunching:(UIApplication *)application { kal = [[KalViewController alloc] init]; kal.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Today" style:UIBarButtonItemStyleBordered target:self action:@selector(showAndSelectToday)] autorelease]; kal.delegate = self; dataSource = [[HolidaySqliteDataSource alloc] init]; kal.dataSource = dataSource; // Setup the navigation stack and display it. navController = [[UINavigationController alloc] initWithRootViewController:kal]; [window addSubview:navController.view]; [window makeKeyAndVisible]; } // Action handler for the navigation bar's right bar button item. - (void)showAndSelectToday { [kal showAndSelectDate:[NSDate date]]; } #pragma mark UITableViewDelegate protocol conformance // Display a details screen for the selected holiday/row. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { Holiday *holiday = [dataSource holidayAtIndexPath:indexPath]; HolidaysDetailViewController *vc = [[[HolidaysDetailViewController alloc] initWithHoliday:holiday] autorelease]; [navController pushViewController:vc animated:YES]; } #pragma mark - - (void)dealloc { [kal release]; [dataSource release]; [window release]; [navController release]; [super dealloc]; } @end I don't want to put this into the AppDelegate, because there could be some overlapping code with other views. It should be a separate "component" which I can call and put on the stack. In my navigation based project I have a main view, the RootViewController. From there I want to push the Kal view on the stack. Currently I'm pushing an additional ViewController on the stack. In the viewWillAppear method from this ViewController I do the things shown in the code above. The following problems appear: Navigation back has to be done two times (one for the Kal calendar, one for my created view) Navigation to my main view is not possible anymore In the moment I don't know where to put this code. So the question is where to put the methods for allocation/initialization as well as the methods for the UITableViewDelegate protocol.

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  • Distinct Value Array for View Controller Index Using Core Data

    - by b.dot
    Hi, I'm trying to create an index representing the first letter value of each record in a Core Data store to be used in a table view controller. I'm using a snippet of the code from Apple's documentation. I would simply like to produce an array or dictionary of distinct values as the result. My store already has the character defined within each record object. Questions: 1) I'm having a problem understanding NSDictionaryResultType. Where does the resulting dictionary object get received so that I can assign it's keys to the view controller? The code seems to only return an array. 2) If I include the line containing NSDictionaryResultType, I get no returns. 3) I realize that I could do this in a loop, but I'm hoping this will work. Thanks! NSEntityDescription *entity = [NSEntityDescription entityForName:@"People" inManagedObjectContext:managedObjectContext]; NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:entity]; [request setResultType:NSDictionaryResultType]; // This line causes no no results. [request setReturnsDistinctResults:YES]; [request setPropertiesToFetch :[NSArray arrayWithObject:@"alphabetIndex"]]; NSError *error; NSArray *objects = [managedObjectContext executeFetchRequest:request error:&error];

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