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  • iPad SDK, how to handle orientation with an UIImageView

    - by Salah
    Hello I'm developing an app for iPad and I try to handle multiple orientation. My app contains a webview and a loading UIImageView that appears when my webview is loading content. This UIImageView has a background image that I set in InterfaceBuilder. When I change orientation to landscape, the image is cut. I'd like the UIImageView to set image-portrait.png when the ipad is in portrait mode and image-landscape.png when it's in landscape mode. Thank you for your help and advices! Screenshots :

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  • how to delete contents from plist programmatically ?

    - by srikanth rongali
    I have a plist file. I want to delete the data from the plist. How can I do it programmatically ? My Plist have an array cells. cells is filled by dictionaries . Each dictionary is filled by string. I used the following way. NSString* plistPath1 = [[NSBundle mainBundle] pathForResource:@"details" ofType:@"plist"]; [cells removeObjectAtIndex:[clickedButtonPath row]]; NSMutableArray *array1 = [[NSMutableArray alloc] initWithCapacity:4]; array1 = cells; [array1 writeToFile:plistPath1 atomically: YES]; But the plist is not taking the changes. Thank you.

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  • Core Data - NSPredicate to filter to-many relationship

    - by Macatomy
    I have 2 entities, Task and List. Each task has a to-one relationship to a List object called "list", and there is an inverse relationship with List, which has a to-many relationship with Task called "tasks". I'm trying to use a fetch request with an NSPredicate to get all the Task objects that belong to a specified List: NSPredicate *predicate = [NSPredicate predicateWithFormat:@"list=%@", theList]; [fetchRequest setPredicate:predicate]; (where "theParent" is a reference to a List object). However this returns no fetched objects. If I take out the predicate, then the objects are returned (so I do know they exist, and by NSLogging theList I know it has Task objects associated with it). Thanks

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  • wheel of fortune collision detection

    - by Andrew
    Hey, I have a wheel segmented into 8 pie pieces, and a picker that is pointing at the currently selected segment (think wheel of fortune). I want to highlight the currently selected segment, and so have started to use Chipmunk to construct the 8 segments, attached to a rotating body, and then the picker that is put in a position to collide with each of the segments. The trick is, how do you allow the picker to pass over top of the segments, while still getting the collision, but not actually colliding and slowing down the wheel? I haven't started down this path yet, but thought this may solve the problem: removing the colliding segment and then putting it back after the picker has started colliding with another segment a bit away (like two segments away). There may be a much simpler solution not even involving Chipmunk that I haven't thought of. Thanks, Andrew

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  • Google Reader API with Objective-C - Problem getting token

    - by JustinXXVII
    I am able to successfully get the SID (SessionID) for my Google Reader account. In order to obtain the feed and do other operations inside Google Reader, you have to obtain an authorization token. I'm having trouble doing this. Can someone shed some light? //Create a cookie to append to the GET request NSDictionary *cookieDictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"SID",@"NSHTTPCookieName",self.sessionID,@"NSHTTPCookieValue",@".google.com",@"NSHTTPCookieDomain",@"/",@"NSHTTPCookiePath",@"NSHTTPCookieExpires",@"160000000000",nil]; NSHTTPCookie *authCookie = [NSHTTPCookie cookieWithProperties:cookieDictionary]; //The URL to obtain the Token from NSURL *tokenURL = [NSURL URLWithString:@"http://www.google.com/reader/api/0/token"]; NSMutableURLRequest *tokenRequest = [NSMutableURLRequest requestWithURL:tokenURL]; //Not sure if this is right: add cookie to array, extract the headers from the cookie inside the array...? [tokenRequest setAllHTTPHeaderFields:[NSHTTPCookie requestHeaderFieldsWithCookies:[NSArray arrayWithObjects:authCookie,nil]]]; //This gives me an Error 403 Forbidden in the didReceiveResponse of the delegate [NSURLConnection connectionWithRequest:tokenRequest delegate:self]; I get a 403 Forbidden error as the response from Google. I'm probably not doing it right. I set the dictionary values according to the documentation for NSHTTPCookie.

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  • NSMutableArray count method show the NSMutableArray is count 0?

    - by Tattat
    This is my init method: -(id)init{ self = [super init]; magicNumber = 8; myMagicArray = [[NSMutableArray alloc] initWithCapacity:(magicNumber*magicNumber)]; NSLog(@"this is the magic Array: %d", [myMagicArray count]); return self; } This is the .h: @interface Magic : NSObject { NSMutableArray *myMagicArray; int magicNumber; } The console shows me that number is 0. instead of 64, wt's happen? I already check out this post: StackOverflow Link: http://stackoverflow.com/questions/633699/nsmutablearray-count-always-returns-zero

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  • How do I send SMS without launching Text application?

    - by Thomas
    Hello all: I am developing a simple application which has to send an SMS message from the app itself instead of launching the native Text app. Here's my action now. What should I change to achieve my desired functionality? -(IBAction)startButtonPressed { NSString *phoneNumber = @"13136296693"; NSString *url = [NSString stringWithFormat: @"sms:%@",phoneNumber]; NSLog(@"Send SMS to: %@ ", url); [[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]]; } Thanks! Thomas

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  • How can I launch app store from my application

    - by Tankista
    Im trying to implement button which opens app store application from my app. I use this simple line of code, which opens safari but not app store application. [[UIApplication sharedApplication] openURL:[NSURL URLWithString: @"http://itunes.apple.com/sk/app/tweetie-2/id333903271?mt=8"]]; I dont know whats wrong, is the URL format correct? I was following this document. All related questions in stackoverflow are outofdate I suppose.

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  • How does glClear() improve performance?

    - by Jon-Eric
    Apple's Technical Q&A on addressing flickering (QA1650) includes the following paragraph. (Emphasis mine.) You must provide a color to every pixel on the screen. At the beginning of your drawing code, it is a good idea to use glClear() to initialize the color buffer. A full-screen clear of each of your color, depth, and stencil buffers (if you're using them) at the start of a frame can also generally improve your application's performance. On other platforms, I've always found it to be an optimization to not clear the color buffer if you're going to draw to every pixel. (Why waste time filling the color buffer if you're just going to overwrite that clear color?) How can a call to glClear() improve performance?

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  • How to search and locate (annotate) in MKMapView?

    - by chaitanya
    Hi, In my application I have to search five nearest locations of "medical services" using the user current location and annotate those locations on my MKMapView. Can any one tell me how to search with a particular keyword (eg. medical services, garages) by using user current locations and annotate onto the map and when the user taps on the annotations it should show the complete address of the locations which is annotated. Can anyone help me in this?

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  • UIPickerView Custom Font

    - by Lee Armstrong
    I have the following code that I have found and tried to implement. I want to set the UIPickerView to have labels that I can customize the text in... When loading this it is just blank at the moment! - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { UILabel *pickerLabel = (UILabel *)view; NSString *text = @"TTT"; // Reuse the label if possible, otherwise create and configure a new one if ((pickerLabel == nil) || ([pickerLabel class] != [UILabel class])) { //newlabel CGRect frame = CGRectMake(0.0, 0.0, 270, 32.0); pickerLabel = [[[UILabel alloc] initWithFrame:frame] autorelease]; pickerLabel.textAlignment = UITextAlignmentLeft; pickerLabel.backgroundColor = [UIColor clearColor]; pickerLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:28]; } pickerLabel.textColor = [UIColor brownColor]; return pickerLabel; }

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  • how i print the values from NSArray objects in CGContextShowTextAtpoint()?

    - by Rajendra Bhole
    Hi, I developing an application in which i want to print the values on a line interval, for that i used NSArray with multiple objects and those object i passing into CGContextShowTextAtPoint() method. The code is. CGContextMoveToPoint(ctx, 30.0, 200.0); CGContextAddLineToPoint(ctx, 30.0, 440.0); NSArray *hoursInDays = [[NSArray alloc] initWithObjects:@"0",@"1",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12", nil]; int intHoursInDays = 0; for(float y = 400.0; y >= 200.0; y-=18, intHoursInDays++) { CGContextSetRGBStrokeColor(ctx, 2.0, 2.0, 2.0, 1.0); CGContextMoveToPoint(ctx, 28, y); CGContextAddLineToPoint(ctx, 32, y); CGContextSelectFont(ctx, "Helvetica", 12.0, kCGEncodingMacRoman); CGContextSetTextDrawingMode(ctx, kCGTextFill); CGContextSetRGBFillColor(ctx, 0, 255, 255, 1); CGAffineTransform xform = CGAffineTransformMake( 1.0, 0.0, 0.0, -1.0, 0.0, 0.0); CGContextSetTextMatrix(ctx, xform); NSString *arrayDataForYAxis = [hoursInDays objectAtIndex:intHoursInDays]; CGContextShowTextAtPoint(ctx, 10.0, y+20, [arrayDataForYAxis UTF8String], strlen((char *)arrayDataForYAxis)); CGContextStrokePath(ctx); } The above code is executed but it given me output is {oo, 1o,2o,...........11}, i want the output is {0,1,2,3...........11,12}. The above code given me one extra character "o" after single digit.I think the problem i meet near the parameters type casting of 5th parameter inside the method of CGContextShowTextAtpoint CGContextShowTextAtpoint(). How i resolve the problem of type casting for printing the objects of NSSArray in CGContextShowTextAtpoint() method??????????????

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  • First Letter Section Headers with Core Data

    - by Cory Imdieke
    I'm trying to create a list of people sorted in a tableView of sections with the first letter as the title for each section - a la Address Book. I've got it all working, though there is a bit of an issue with the sort order. Here is the way I'm doing it now: NSFetchRequest *request = [[NSFetchRequest alloc] init]; [request setEntity:[NSEntityDescription entityForName:@"Contact" inManagedObjectContext:context]]; NSSortDescriptor *fullName = [[NSSortDescriptor alloc] initWithKey:@"fullName" ascending:YES]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:fullName, nil]; [request setSortDescriptors:sortDescriptors]; [fullName release]; [sortDescriptors release]; NSError *error = nil; [resultController release]; resultController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:context sectionNameKeyPath:@"firstLetter" cacheName:nil]; [resultController performFetch:&error]; [request release]; fullName is a standard property, and firstLetter is a transient property which returns - as you'd expect - the first letter of the fullName. 95% of the time, this works perfectly. The problem is the result controller expects these two "lists" (the sorted fullName list and the sorted firstLetter list) to match exactly. If I have 2 contacts like John and Jack, my fullName list would sort these as Jack, John every time but my firstLetter list might sort them as John, Jack sometimes as it's only sorting by the first letter and leaving the rest to chance. When these lists don't match up, I get a blank tableView with 0 items in it. I'm not really sure how I should go about fixing this issue, but it's very frustrating. Has anyone else run into this? What did you guys find out?

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  • CryptoExcercise Encryption/Decryption Problem

    - by venkat
    I am using apples "cryptoexcercise" (Security.Framework) in my application to encrypt and decrypt a data of numeric value. When I give the input 950,128 the values got encrypted, but it is not getting decrypted and exists with the encrypted value only. This happens only with the mentioned numeric values. Could you please check this issue and give the solution to solve this problem? here is my code (void)testAsymmetricEncryptionAndDecryption { uint8_t *plainBuffer; uint8_t *cipherBuffer; uint8_t *decryptedBuffer; const char inputString[] = "950"; int len = strlen(inputString); if (len > BUFFER_SIZE) len = BUFFER_SIZE-1; plainBuffer = (uint8_t *)calloc(BUFFER_SIZE, sizeof(uint8_t)); cipherBuffer = (uint8_t *)calloc(CIPHER_BUFFER_SIZE, sizeof(uint8_t)); decryptedBuffer = (uint8_t *)calloc(BUFFER_SIZE, sizeof(uint8_t)); strncpy( (char *)plainBuffer, inputString, len); NSLog(@"plain text : %s", plainBuffer); [self encryptWithPublicKey:(UInt8 *)plainBuffer cipherBuffer:cipherBuffer]; NSLog(@"encrypted data: %s", cipherBuffer); [self decryptWithPrivateKey:cipherBuffer plainBuffer:decryptedBuffer]; NSLog(@"decrypted data: %s", decryptedBuffer); free(plainBuffer); free(cipherBuffer); free(decryptedBuffer); } (void)encryptWithPublicKey:(uint8_t *)plainBuffer cipherBuffer:(uint8_t *)cipherBuffer { OSStatus status = noErr; size_t plainBufferSize = strlen((char *)plainBuffer); size_t cipherBufferSize = CIPHER_BUFFER_SIZE; NSLog(@"SecKeyGetBlockSize() public = %d", SecKeyGetBlockSize([self getPublicKeyRef])); // Error handling // Encrypt using the public. status = SecKeyEncrypt([self getPublicKeyRef], PADDING, plainBuffer, plainBufferSize, &cipherBuffer[0], &cipherBufferSize ); NSLog(@"encryption result code: %d (size: %d)", status, cipherBufferSize); NSLog(@"encrypted text: %s", cipherBuffer); } (void)decryptWithPrivateKey:(uint8_t *)cipherBuffer plainBuffer:(uint8_t *)plainBuffer { OSStatus status = noErr; size_t cipherBufferSize = strlen((char *)cipherBuffer); NSLog(@"decryptWithPrivateKey: length of buffer: %d", BUFFER_SIZE); NSLog(@"decryptWithPrivateKey: length of input: %d", cipherBufferSize); // DECRYPTION size_t plainBufferSize = BUFFER_SIZE; // Error handling status = SecKeyDecrypt([self getPrivateKeyRef], PADDING, &cipherBuffer[0], cipherBufferSize, &plainBuffer[0], &plainBufferSize ); NSLog(@"decryption result code: %d (size: %d)", status, plainBufferSize); NSLog(@"FINAL decrypted text: %s", plainBuffer); } (SecKeyRef)getPublicKeyRef { OSStatus sanityCheck = noErr; SecKeyRef publicKeyReference = NULL; if (publicKeyRef == NULL) { NSMutableDictionary *queryPublicKey = [[NSMutableDictionary alloc] init]; // Set the public key query dictionary. [queryPublicKey setObject:(id)kSecClassKey forKey:(id)kSecClass]; [queryPublicKey setObject:publicTag forKey:(id)kSecAttrApplicationTag]; [queryPublicKey setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType]; [queryPublicKey setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnRef]; // Get the key. sanityCheck = SecItemCopyMatching((CFDictionaryRef)queryPublicKey, (CFTypeRef *)&publicKeyReference); if (sanityCheck != noErr) { publicKeyReference = NULL; } [queryPublicKey release]; } else { publicKeyReference = publicKeyRef; } return publicKeyReference; } (SecKeyRef)getPrivateKeyRef { OSStatus resultCode = noErr; SecKeyRef privateKeyReference = NULL; if(privateKeyRef == NULL) { NSMutableDictionary * queryPrivateKey = [[NSMutableDictionary alloc] init]; // Set the private key query dictionary. [queryPrivateKey setObject:(id)kSecClassKey forKey:(id)kSecClass]; [queryPrivateKey setObject:privateTag forKey:(id)kSecAttrApplicationTag]; [queryPrivateKey setObject:(id)kSecAttrKeyTypeRSA forKey:(id)kSecAttrKeyType]; [queryPrivateKey setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecReturnRef]; // Get the key. resultCode = SecItemCopyMatching((CFDictionaryRef)queryPrivateKey, (CFTypeRef *)&privateKeyReference); NSLog(@"getPrivateKey: result code: %d", resultCode); if(resultCode != noErr) { privateKeyReference = NULL; } [queryPrivateKey release]; } else { privateKeyReference = privateKeyRef; } return privateKeyReference; }

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  • Reading email address from contacts fails with weird memory issue - Solved

    - by CapsicumDreams
    Hi all, I'm stumped. I'm trying to get a list of all the email address a person has. I'm using the ABPeoplePickerNavigationController to select the person, which all seems fine. I'm setting my ABRecordRef personDealingWith; from the person argument to - (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier { and everything seems fine up till this point. The first time the following code executes, all is well. When subsequently run, I can get issues. First, the code: // following line seems to make the difference (issue 1) // NSLog(@"%d", ABMultiValueGetCount(ABRecordCopyValue(personDealingWith, kABPersonEmailProperty))); // construct array of emails ABMultiValueRef multi = ABRecordCopyValue(personDealingWith, kABPersonEmailProperty); CFIndex emailCount = ABMultiValueGetCount(multi); if (emailCount > 0) { // collect all emails in array for (CFIndex i = 0; i < emailCount; i++) { CFStringRef emailRef = ABMultiValueCopyValueAtIndex(multi, i); [emailArray addObject:(NSString *)emailRef]; CFRelease(emailRef); } } // following line also matters (issue 2) CFRelease(multi); If compiled as written, the are no errors or static analysis problems. This crashes with a *** -[Not A Type retain]: message sent to deallocated instance 0x4e9dc60 error. But wait, there's more! I can fix it in either of two ways. Firstly, I can uncomment the NSLog at the top of the function. I get a leak from the NSLog's ABRecordCopyValue every time through, but the code seems to run fine. Also, I can comment out the CFRelease(multi); at the end, which does exactly the same thing. Static compilation errors, but running code. So without a leak, this function crashes. To prevent a crash, I need to haemorrhage memory. Neither is a great solution. Can anyone point out what's going on? Solution: It turned out that I wasn't storing the ABRecordRef personDealingWith var correctly. I'm still not sure how to do that properly, but instead of having the functionality in another routine (performed later), I'm now doing the grunt-work in the delegate method, and using the derived results at my leisure. The new (working) routine: - (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person { // as soon as they select someone, return personDealingWithFullName = (NSString *)ABRecordCopyCompositeName(person); personDealingWithFirstName = (NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty); // construct array of emails [personDealingWithEmails removeAllObjects]; ABMutableMultiValueRef multi = ABRecordCopyValue(person, kABPersonEmailProperty); if (ABMultiValueGetCount(multi) > 0) { // collect all emails in array for (CFIndex i = 0; i < ABMultiValueGetCount(multi); i++) { CFStringRef emailRef = ABMultiValueCopyValueAtIndex(multi, i); [personDealingWithEmails addObject:(NSString *)emailRef]; CFRelease(emailRef); } } CFRelease(multi); return NO; }

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  • Updating UIView subclass contents

    - by Brett
    Hi; I am trying to update a UIView subclass to draw individual pixels (rectangles) after calculating if they are in the mandelbrot set. I am using the following code but am getting a blank screen: //drawingView.h ... -(void)drawRect:(CGRect)rect{ CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBFillColor(context, r, g, b, 1); CGContextSetRGBStrokeColor(context, r, g, b, 1); CGRect arect = CGRectMake(x,y,1,1); CGContextFillRect(context, arect); } ... //viewController.m ... - (void)viewDidLoad { [drawingView setX:10]; [drawingView setY:10]; [drawingView setR:0.0]; [drawingView setG:0.0]; [drawingView setB:0.0]; [super viewDidLoad]; [drawingView setNeedsDisplay]; } Once I figure out how to display one pixel, I'd like to know how to go about updating the view by adding another pixel (once calculated). Once all the variables change, how do I keep the current view as is but add another pixel? Thanks, Brett

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  • How to set the content size according to the size of UINavigation bar

    - by Deepika
    Hi all I am resizing the navigation bar when my application switches into landscape orientation. But i am not able to set the content size of navigation bar according to its height. Landscape image :- In this image the top left bar item and title of navigation bar are not resizing when it switches into landscape orientation....they should get re sized according to height of navigation bar. Please suggest me any idea for it? Thanks Deepika

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  • How do I size a UITextView to it's content?

    - by drewh
    Is there a good way to adjust the size of a UITextView to conform to it's content? Say for instance I have a UITextView that contains one line of text: "Hello world" I then add another line of text: "Goodbye world" Is there a good way in Cocoa Touch to get the rect that will hold all of the lines in the text view so that I can adjust the parent view accordingly? As another example, look at the Notes field for events in the Calendar application--note how the cell (and the UITextView it contains) expands to hold all lines of text in the notes string.

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  • Why won't my UISearchDisplayController fire the shouldReloadTableForSearchString method when I enter

    - by Gorgando
    I've been following Apple's TableSearch code example, but it's not working for me and I think I'm doing everything the same way they did it. The method below should be fired whenever the user types anything into the search box, but it never gets fired for me, just on the sample app. I have the appropriate @interface ContactsTableVC : UITableViewController { in the header file. I'm not sure what I'm missing or where else to look. My NSLog never gets called. Thanks for the help! - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString searchScope:(NSInteger)searchOption { NSLog(@"The shouldreloadtableforsearchstring method has been called!"); [self filterContentForSearchText:searchString]; // Return YES to cause the search result table view to be reloaded. return YES; }

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