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  • How to clip the contents of a custom NSView?

    - by Paperflyer
    I have a custom NSView that displays a nice scale/ruler. I am drawing text labels that are partly outside the actual drawing area so they get clipped by the view (looks nice). Now, I want to introduce empty side margins into the view and need to clip its content manually. How can I set up a custom clipping rectangle?

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  • Iphone UITextField only integer

    - by Raphael Pinto
    I have a UITextField in my IB and I want to check out if the user entered only numbers (no char)and get the integer value. I get the integer value of the UITextField like that : int integer = [myUITexrtField.text intValue]; When I put a character ( , ; . ) it return me 0 and I don't know how to detect that it is not only numbers. How can I do?

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  • iphone - memory leaks in separate thread

    - by Brodie4598
    I create a second thread to call a method that downloads several images using: [NSThread detachNewThreadSelector:@selector(downloadImages) toTarget:self withObject:nil]; It works fine but I get a long list of leaks in the log similar to: 2010-04-18 00:48:12.287 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbec2640 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5e973 0x5e770 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) 2010-04-18 00:48:12.288 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbe01510 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5e7a6 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) 2010-04-18 00:48:12.289 FS Companion[11074:650f] * _NSAutoreleaseNoPool(): Object 0xbde6720 of class NSCFString autoreleased with no pool in place - just leaking Stack: (0xa58af 0xdb452 0x5ea73 0x5e7c2 0x11d029 0x517fa 0x51708 0x85f2 0x3047d 0x30004 0x99481fbd 0x99481e42) Can someone help me understand the problem?

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  • On iPhone, how do I show a login screen to get username and password before giving access to iPhone

    - by MikeN
    On iPhone, how do I show a login screen to get username and password before giving access to iPhone app? Also, does the iPhone store a cookie to the secure website like a web browser? I was thinking of giving users to my website a long API key to store in the settings of their iPhone instead of asking them to login with a username/password (seems to be the Slicehost iPhone app approach.) Which is the best way to get a user to login securely? I have full control over the design of the iPhone app and website so have a lot of flexibility.

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  • iphone image saving

    - by kpower
    I can save image to iPhone (iPhone Photo Albums \ Saved Photos) with UIImageWriteToSavedPhotosAlbum(image, onCompleteTarget, onCompleteSelector, contextInfoToCompleteSelector); But if there any way to check, if current image was already saved (to save it only once)?

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  • How to add a scrollable NSTableView programmatically

    - by Jakob Dam Jensen
    I'm trying to add a tableview to a view in code instead of using Interface Builder and unfortunately it's causing some problems =( Here's an example of how I'm doing it now. NSScrollView *scrollView = [[NSScrollView alloc] initWithFrame:someRect]; NSTableView *tableView = [[NSTableView alloc] initWithFrame: scrollView.bounds]; resultsTableView.dataSource = self; resultsScrollView.documentView = resultsTableView; [someView addSubview: scrollView]; So basically I'm just putting the tableView inside the scrollView (because that's what IB is doing) and then adding the latter as a subview of the someView. The result is that a tableView appears - but the no data is shown within the tableView. Debugging shows that the dataSource is being asked for how many rows are in the tableView but the method: tableView:objectValueForTableColumn:row: is never being called. I suspect that this is because of my way of creating the tableView. I've tried google but no luck and the "Introduction to Table Views Programming Guide" on macdevcenter wasn't helpful either. What am I missing? Thanks in advance...

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  • Accessing XML data online?

    - by fuzzygoat
    I am just testing an app to get data off our web server, previously I had been using: NSURL, NSURLRequest, NSURLConnection etc. to get the data that I wanted. But I have just noticed that if I swap to using XML I can simply do the following and pass the results to NSXMLParser: NSURL *url = [NSURL URLWithString:@"https://www.fuzzygoat.com/turbine?nbytes=1&fmt=xml"]; Am I right in thinking that if your just after XML this is an acceptable method? It just seems strongly short compared to what I was doing before? gary

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  • How to change by using CVGrayscaleMat

    - by Babul
    With the following code the image showed as above is converted as below image... Their it's showing black background with gray lines.....i want white background with gray lines .. Please guide me .. i am new to iPhone Thanks alot in Advance - (void)viewDidLoad { [super viewDidLoad]; // Initialise video capture - only supported on iOS device NOT simulator #if TARGET_IPHONE_SIMULATOR NSLog(@"Video capture is not supported in the simulator"); #else _videoCapture = new cv::VideoCapture; if (!_videoCapture->open(CV_CAP_AVFOUNDATION)) { NSLog(@"Failed to open video camera"); } #endif // Load a test image and demonstrate conversion between UIImage and cv::Mat UIImage *testImage = [UIImage imageNamed:@"testimage.jpg"]; double t; int times = 10; //-------------------------------- // Convert from UIImage to cv::Mat NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { cv::Mat tempMat = [testImage CVMat]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; [pool release]; NSLog(@"UIImage to cv::Mat: %gms", t); //------------------------------------------ // Convert from UIImage to grayscale cv::Mat pool = [[NSAutoreleasePool alloc] init]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { cv::Mat tempMat = [testImage CVGrayscaleMat]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; [pool release]; NSLog(@"UIImage to grayscale cv::Mat: %gms", t); //-------------------------------- // Convert from cv::Mat to UIImage cv::Mat testMat = [testImage CVMat]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { UIImage *tempImage = [[UIImage alloc] initWithCVMat:testMat]; [tempImage release]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; NSLog(@"cv::Mat to UIImage: %gms", t); // Process test image and force update of UI _lastFrame = testMat; [self sliderChanged:nil]; } - (IBAction)capture:(id)sender { if (_videoCapture && _videoCapture->grab()) { (*_videoCapture) >> _lastFrame; [self processFrame]; } else { NSLog(@"Failed to grab frame"); } } - (void)processFrame { double t = (double)cv::getTickCount(); cv::Mat grayFrame, output; // Convert captured frame to grayscale cv::cvtColor(_lastFrame, grayFrame, cv::COLOR_RGB2GRAY); // Perform Canny edge detection using slide values for thresholds cv::Canny(grayFrame, output, _lowSlider.value * kCannyAperture * kCannyAperture, _highSlider.value * kCannyAperture * kCannyAperture, kCannyAperture); t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency(); // Display result self.imageView.image = [UIImage imageWithCVMat:output]; self.elapsedTimeLabel.text = [NSString stringWithFormat:@"%.1fms", t]; }

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  • "EXC_BAD_ACCESS: Unable to restore previously selected frame" Error, Array size?

    - by Job
    Hi there, I have an algorithm for creating the sieve of Eratosthenes and pulling primes from it. It lets you enter a max value for the sieve and the algorithm gives you the primes below that value and stores these in a c-style array. Problem: Everything works fine with values up to 500.000, however when I enter a large value -while running- it gives me the following error message in xcode: Program received signal: “EXC_BAD_ACCESS”. warning: Unable to restore previously selected frame. Data Formatters temporarily unavailable, will re-try after a 'continue'. (Not safe to call dlopen at this time.) My first idea was that I didn't use large enough variables, but as I am using 'unsigned long long int', this should not be the problem. Also the debugger points me to a point in my code where a point in the array get assigned a value. Therefore I wonder is there a maximum limit to an array? If yes: should I use NSArray instead? If no, then what is causing this error based on this information? EDIT: This is what the code looks like (it's not complete, for it fails at the last line posted). I'm using garbage collection. /*--------------------------SET UP--------------------------*/ unsigned long long int upperLimit = 550000; // unsigned long long int sieve[upperLimit]; unsigned long long int primes[upperLimit]; unsigned long long int indexCEX; unsigned long long int primesCounter = 0; // Fill sieve with 2 to upperLimit for(unsigned long long int indexA = 0; indexA < upperLimit-1; ++indexA) { sieve[indexA] = indexA+2; } unsigned long long int prime = 2; /*-------------------------CHECK & FIND----------------------------*/ while(!((prime*prime) > upperLimit)) { //check off all multiples of prime for(unsigned long long int indexB = prime-2; indexB < upperLimit-1; ++indexB) { // Multiple of prime = 0 if(sieve[indexB] != 0) { if(sieve[indexB] % prime == 0) { sieve[indexB] = 0; } } } /*---------------- Search for next prime ---------------*/ // index of current prime + 1 unsigned long long int indexC = prime - 1; while(sieve[indexC] == 0) { ++indexC; } prime = sieve[indexC]; // Store prime in primes[] primes[primesCounter] = prime; // This is where the code fails if upperLimit > 500000 ++primesCounter; indexCEX = indexC + 1; } As you may or may not see, is that I am -very much- a beginner. Any other suggestions are welcome of course :)

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  • How to enable Cancel button on UI Searchbar iPhone

    - by sandy
    I am using an UI search bar into my iPhone application, I would like enable Cancel button of Search bar at the time of view did load but not able to do so as its gets activated when a user starts editing the search bar. To be more precise I would to achieve the serach functionality that has been provided by Apple in Stock application

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  • How can I fill a rect with an alpha color using CoreGraphics?

    - by Rits Plasman
    In my drawRect method, I am drawing a PNG image. On top of that, I want to draw a rect with a 20% alpha color, like this: [[UIColor colorWithWhite:0.0 alpha:0.2] set]; UIRectFill(rect); The problem is, that the alpha property seems to get ignored. No alpha is applied at all, just a black rectangle is drawn. How can I fix this? Thanks in advance!

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  • Instruments (Leaks) and NSDateFormatter

    - by Cal
    When I run my iPhone app with Instruments Leaks and parse a bunch of NSDates using NSDateFormatter my memory goes up about 1mb and stays even though these NSDates should be dealloc'd after the parsing (I just discard them if they aren't new). I thought the malloc (in my heaviest stack trace below) could become part of the NSDate but I also thought it could be memory that only used during some intermediate step in parsing. Does anyone know which one it is or how to find out? Also, is there a way to put a breakpoint on NSDate dealloc to see if that memory is really being reclaimed? Here's what my date formatter looks like for parsing these dates: df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"EEE, d MMM yyyy H:m:s z"]; Here's the Heaviest Stack trace when the memory bumps up and stays there: 0 libSystem.B.dylib 208.80 Kb malloc 1 libicucore.A.dylib 868.19 Kb icu::ZoneMeta::getSingleCountry(icu::UnicodeString const&, icu::UnicodeString&) 2 libicucore.A.dylib 868.66 Kb icu::ZoneMeta::getSingleCountry(icu::UnicodeString const&, icu::UnicodeString&) 3 libicucore.A.dylib 868.67 Kb icu::ZoneMeta::getSingleCountry(icu::UnicodeString const&, icu::UnicodeString&) 4 libicucore.A.dylib 868.67 Kb icu::DateFormatSymbols::initZoneStringFormat() 5 libicucore.A.dylib 868.67 Kb icu::DateFormatSymbols::getZoneStringFormat() const 6 libicucore.A.dylib 868.67 Kb icu::SimpleDateFormat::subParse(icu::UnicodeString const&, int&, unsigned short, int, signed char, signed char, signed char*, icu::Calendar&) const 7 libicucore.A.dylib 868.67 Kb icu::SimpleDateFormat::parse(icu::UnicodeString const&, icu::Calendar&, icu::ParsePosition&) const 8 libicucore.A.dylib 868.67 Kb icu::DateFormat::parse(icu::UnicodeString const&, icu::ParsePosition&) const 9 libicucore.A.dylib 868.67 Kb udat_parse 10 CoreFoundation 868.67 Kb CFDateFormatterGetAbsoluteTimeFromString 11 CoreFoundation 868.67 Kb CFDateFormatterCreateDateFromString 12 Foundation 868.67 Kb -[NSDateFormatter getObjectValue:forString:range:error:] 13 Foundation 868.75 Kb -[NSDateFormatter getObjectValue:forString:errorDescription:] 14 Foundation 868.75 Kb -[NSDateFormatter dateFromString:] Thanks!

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  • Debugging NSoperation BAD ACCESS within graphics context

    - by Joe
    I tried everything to debug this one but I can't get to the bottom of it. This code lives in a subclass of NSOperation which is processed from a queue: (borders is an ivar NSArray containing 5 UIimage objects) NSMutableArray *images = [[NSMutableArray alloc] init]; for (unsigned i = 0; i < 5; i++) { CGSize size = CGSizeMake(60, 60); UIGraphicsBeginImageContext(size); CGPoint thumbPoint = CGPointMake(6, 6); [controller.image drawAtPoint:thumbPoint]; CGPoint borderPoint = CGPointMake(0, 0); [[borders objectAtIndex:i] drawAtPoint:borderPoint]; [images addObject:UIGraphicsGetImageFromCurrentImageContext()]; UIGraphicsEndImageContext(); } [images release]; The code works fine most of the time but when I push the iphone by access subviews and pressing lots of buttons on the UI I either get this exception which is trapped by the operation: Exception Load view: *** -[NSCFArray insertObject:atIndex:]: attempt to insert nil or I get this: Program received signal: “EXC_BAD_ACCESS”. The exception is caused because UIGraphicsGetImageFromCurrentImageContext() return nil. I don't know how to debug the EXC_BAD_ACCESS but I'm guessing that this error (in fact both of these errors) is caused by low memory. The debugger stops at the line: [controller.image drawAtPoint:thumbPoint]; As I mentioned I've trapped the exception so I can live with that but the EXC_BAD_ACCESS is more serious. IF this is memory related how can I tell and is it possible to increase the memory available to NSOperation?

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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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  • CoreData many-to-many relationship NSPredicate Exceptions

    - by user307550
    I'm trying to model a Person/Team relationship. It's a many to many relationship since a person can belong to multiple teams and a team can have multiple people. As suggested by the doc I created an intermediate entity called TeamMember. I am now trying to run a query to see if I have a list of people, whether a pre-existing Team already exists for them so I'm not storing duplicate Teams in the database NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Team" inManagedObjectContext:[pm managedObjectContext]]; [request setEntity:entity]; NSPredicate *predicate = nil; predicate = [NSPredicate predicateWithFormat:@"ALL %K IN %@", @"teamMembers.person", players]; players is an NSSet of people that I'm trying to search I'm getting the following exception: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unsupported predicate ALL teamMembers.person IN { (entity: Person; id: 0x1334470 ; data: { Ideally I would like them to match exactly and not just do an IN as well. Any help would be greatly appreciated

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  • How to open a document using an application launched via NSTask?

    - by zneak
    Hello world, I've grown tired of the built-in open Mac OS X command, mostly because it runs programs with your actual user ID instead of the effective user ID; this results in the fact sudo open Foo opens Foo with its associated application with your account instead of the root account, and it annoys me. So I decided to make some kind of replacement. So far I've been successful: I can open any program under the open -a or open -b fashion, and support optionally waiting. I'm using NSTask for that purpose. However, I'd like to be able to open documents too. As far as I can see, you need to use NSWorkspace for that, but using NSWorkspace to launch programs results in them being launched with your account's credentials instead of your command line program's credentials. Which is precisely what the default open tool does, and precisely what I don't want. So, how can I have a program request that another program opens a document without using NSWorkspace? From the NSTask object, I can have the process ID, but that's about it.

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  • Get text of button from IBAction - iPhone

    - by Organiccat
    When an IBAction is called: -(IBAction) onClick1: (id) sender; What is passed in the sender? Since it's hooked up through the IB, I'm not really sure. My question is how to get the text of the button to be the passed object (NSString most likely) so that I could call it inside the action implementation. -(IBAction) onClick1: (id) sender { NSLog(@"User clicked %@", sender); // Do something here with the variable 'sender' }

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  • Adding unique objects to Core Data

    - by absolut
    I'm working on an iPhone app that gets a number of objects from a database. I'd like to store these using Core Data, but I'm having problems with my relationships. A Detail contains any number of POIs (points of interest). When I fetch a set of POI's from the server, they contain a detail ID. In order to associate the POI with the Detail (by ID), my process is as follows: Query the ManagedObjectContext for the detailID. If that detail exists, add the poi to it. If it doesn't, create the detail (it has other properties that will be populated lazily). The problem with this is performance. Performing constant queries to Core Data is slow, to the point where adding a list of 150 POI's takes a minute thanks to the multiple relationships involved. In my old model, before Core Data (various NSDictionary cache objects) this process was super fast (look up a key in a dictionary, then create it if it doesn't exist) I have more relationships than just this one, but pretty much every one has to do this check (some are many to many, and they have a real problem). Does anyone have any suggestions for how I can help this? I could perform fewer queries (by searching for a number of different ID's), but I'm not sure how much this will help. Some code: POI *poi = [NSEntityDescription insertNewObjectForEntityForName:@"POI" inManagedObjectContext:[(AppDelegate*)[UIApplication sharedApplication].delegate managedObjectContext]]; poi.POIid = [attributeDict objectForKey:kAttributeID]; poi.detailId = [attributeDict objectForKey:kAttributeDetailID]; Detail *detail = [self findDetailForID:poi.POIid]; if(detail == nil) { detail = [NSEntityDescription insertNewObjectForEntityForName:@"Detail" inManagedObjectContext:[(AppDelegate*)[UIApplication sharedApplication].delegate managedObjectContext]]; detail.title = poi.POIid; detail.subtitle = @""; detail.detailType = [attributeDict objectForKey:kAttributeType]; } -(Detail*)findDetailForID:(NSString*)detailID { NSManagedObjectContext *moc = [[UIApplication sharedApplication].delegate managedObjectContext]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"Detail" inManagedObjectContext:moc]; NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; [request setEntity:entityDescription]; NSPredicate *predicate = [NSPredicate predicateWithFormat: @"detailid == %@", detailID]; [request setPredicate:predicate]; NSLog(@"%@", [predicate description]); NSError *error; NSArray *array = [moc executeFetchRequest:request error:&error]; if (array == nil || [array count] != 1) { // Deal with error... return nil; } return [array objectAtIndex:0]; }

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  • Memory leak at Autorelease pool in Iphone sdk

    - by monish
    Hi guys, I am getting leak at [pool release]; My code here is: #pragma mark UISearchBarDelegate delegate methods - (void)performSearch:(UISearchBar *)aSearchBar { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; artistName= [aSearchBar.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; if ([artistName length] > 0) { [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; LyricsAppDelegate* appDelegate = (LyricsAppDelegate*) [ [UIApplication sharedApplication] delegate]; artistsList=[appDelegate doSearch:artistName ]; [theTableView reloadData]; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; [aSearchBar resignFirstResponder]; } else { [aSearchBar resignFirstResponder]; } [NSThread exit]; [pool release]; } - (void)searchBarSearchButtonClicked:(UISearchBar *)aSearchBar { @try { [NSThread detachNewThreadSelector:@selector(performSearch:) toTarget:self withObject:aSearchBar]; [aSearchBar resignFirstResponder]; } @catch (NSException * e) { NSLog(@"\n caught an exception"); } @finally { } } Here I am getting leak at [pool release]; in performSearch method. How can I solve this. Anyone's help will be much appreciated. Thank you, Monish.

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  • NSString stringWithFormat swizzled to allow missing format numbered args

    - by coneybeare
    Based on this SO question asked a few hours ago, I have decided to implement a swizzled method that will allow me to take a formatted NSString as the format arg into stringWithFormat, and have it not break when omitting one of the numbered arg references (%1$@, %2$@) I have it working, but this is the first copy, and seeing as this method is going to be potentially called hundreds of thousands of times per app run, I need to bounce this off of some experts to see if this method has any red flags, major performance hits, or optimizations #define NUMARGS(...) (sizeof((int[]){__VA_ARGS__})/sizeof(int)) @implementation NSString (UAFormatOmissions) + (id)uaStringWithFormat:(NSString *)format, ... { if (format != nil) { va_list args; va_start(args, format); // $@ is an ordered variable (%1$@, %2$@...) if ([format rangeOfString:@"$@"].location == NSNotFound) { //call apples method NSString *s = [[[NSString alloc] initWithFormat:format arguments:args] autorelease]; va_end(args); return s; } NSMutableArray *newArgs = (NSMutableArray *)[NSMutableArray arrayWithCapacity:NUMARGS(args)]; id arg = nil; int i = 1; while (arg = va_arg(args, id)) { NSString *f = (NSString *)[NSString stringWithFormat:@"%%%d\$\@", i]; i++; if ([format rangeOfString:f].location == NSNotFound) continue; else [newArgs addObject:arg]; } va_end(args); char *newArgList = (char *)malloc(sizeof(id) * [newArgs count]); [newArgs getObjects:(id *)newArgList]; NSString* result = [[[NSString alloc] initWithFormat:format arguments:newArgList] autorelease]; free(newArgList); return result; } return nil; } The basic algorithm is: search the format string for the %1$@, %2$@ variables by searching for %@ if not found, call the normal stringWithFormat and return else, loop over the args if the format has a position variable (%i$@) for position i, add the arg to the new arg array else, don't add the arg take the new arg array, convert it back into a va_list, and call initWithFormat:arguments: to get the correct string. The idea is that I would run all [NSString stringWithFormat:] calls through this method instead. This might seem unnecessary to many, but click on to the referenced SO question (first line) to see examples of why I need to do this. Ideas? Thoughts? Better implementations? Better Solutions?

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  • NSOutlineview - strange behavior after reloading data

    - by matei
    I have a NSOutlineView which loads data from a data source. The table is displayed in a panel. The items shown in the table are items which belong to an object (the relation is one-to many between the object and the items). I have a list of objects in a combo box (in fact a NSPopupButton), and when I select another object in the combo box, I want it's items to be shown in the table (the NSOutlineView). I managed to do all this , however when I select another object from the combo box, not all of it's items are displayed. I have put some logging messages in the data source and it seems that there are some items that are being returned from the data source , but are not shown in the table (and are not queried for children). Now the strange part is that when I click the main window (as I said, all that I described here is in a NSPanel loaded on top of the window) , all the data is displayed correctly. It seems as if clicking the main window triggers something in the NSOutlineView that makes it display the missing items, but I can't tell what it is.

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