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  • getting a tiled image collection on the iPad (deepzoom)

    - by Chris B
    I have a set of tiled image collections created via microsoft's deep zoom composer, and a silverlight app that currently consumes them for display via MultiScaleImage - it's all working pretty well - I'd just like to get some experience with iPad programming and have a couple of ideas for some ipad applications. All my ideas rely on me being able to display/manipulate these tiled image sets (on the iPad). I just picked up a iMac to facilitate this. I'm not seeing any objective-c / cocoa-touch libraries for this though, so am assuming I will have to roll my own. (Saw the seadragon ajax component, which is pretty slick, but I'm dealing with collections here, which it doesn't support. I would also like to roll this as a native app just to get the experience). The only open source project I found for displaying/manipulating the tiled image sets was Openzoom -a flash component. I'm not to familiar with actionscript either (python, java, c#, and c are the only languages I have really used), but briefly inspecting the code I didn't really have any issues with it and can probably use it for hints on how to swap the tiles in and out, etc.. But, as I'm pretty new to obj-c/cocoa-touch, some pointers in the right direction would be appreciated. 1) Are there any other projects out there I am missing, or is openzoom my best bet for some reference? 2) Should I be trying to do this display in the UIKit framework, or should I do it as an OpenGL display? 3) Any other suggestions/pointers that I didn't think to ask.

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  • Reading Certificates on iOS Problem

    - by David Schiefer
    I am trying to read certificates from various URLs in iOS. My code however is not working well - the array that should return the information I need always returns null. What am I missing? - (void)findCertificate:(NSString *)url { NSInputStream*input = [[NSInputStream inputStreamWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://store.writeitstudios.com"]]] retain]; [input setDelegate:self]; [input scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode]; [input open]; NSLog(@"Status: %i",[input streamStatus]); } - (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode { NSLog(@"handle Event: %i",eventCode); if (eventCode == NSStreamStatusOpen) { NSArray *certificates = (NSArray*)CFReadStreamCopyProperty((CFReadStreamRef)aStream, kCFStreamPropertySSLPeerCertificates); NSLog(@"Certs: %@",CFReadStreamCopyProperty((CFReadStreamRef)aStream, kCFStreamPropertySSLPeerCertificates)); if ([certificates count] > 0) { SecCertificateRef certificate = (SecCertificateRef)[certificates objectAtIndex:0]; NSString *description = (NSString*)SecCertificateCopySubjectSummary(certificate); NSData *data = (NSData *)SecCertificateCopyData(certificate); NSLog(@"Description: %@",description); } } } And yes, I am aware that I am leaking memory. This is just a snippet.

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  • Unable to Parse Date using NSDateFormatter

    - by Ansari
    Hi, I am fetching a RSS, in which i receive the following Date stamp: 2010-05-10T06:11:14.000Z Now i am using NSDateFormatter to parse this datetime stamp. [parseFormatter setDateFormat:@"yyyy-MM-dTH:m:s.z"]; But its not working fine if just remove the time stamp part it works for the date [parseFormatter setDateFormat:@"yyyy-MM-d"]; But if i add the rest of the stuff it returns nil. Any idea ? Thanks in Advance....

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  • Using an IBAction method when it is not called from an action?

    - by cannyboy
    Are there any issues when using IBAction when it is not actually called from a user's action? If you have an action like -(IBAction)sayHello:(id)sender; You can call it from within your class like: [self sayHello:@"x"] The @"x" doesn't do anything, it just fills in for the sender. You can actually create an IBAction method without (id)sender -(IBAction)sayHello; and call it from both user's actions and from within the code, but then you won't get any useful sender info from the interface. What's the 'correct' way of filling in for the sender, when calling from the code? And can you create sender info to send when it's called from within the code? Just trying to figure it out.

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  • how and where should I set and load NSUserDefaults in a utility app?

    - by Greywolf210
    I have followed directions in several books and suggestions on some forums but I have issues with my app crashing when I try and set user preferences. I have the following lines on my "done" method in my flipscreenViewController: - (IBAction)done { NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; [userDefaults setBool:musicOnOff.on forKey:kMusicPreference]; [userDefaults setObject:trackSelection forKey:kTrackPreference]; [self.delegate flipsideViewControllerDidFinish:self];} and the following 2 methods in my mainViewController: -(void)initialDefaults{ NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; [userDefaults setBool:YES forKey:kMusicPreference]; [userDefaults setObject:@"Infinity" forKey:kTrackPreference];} -(void) setvaluesFromPreferences { NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; BOOL musicSelection = [userDefaults boolForKey:kMusicPreference]; NSString *trackSelection = [userDefaults objectForKey:kTrackPreference]; if(musicSelection == YES) { if([trackSelection isEqualToString:@"Infinity"]) song = [[BGMusic alloc]initWithPath:[[NSBundle mainBundle] pathForResource:@"Infinity" ofType:@"m4a"]]; else if([trackSelection isEqualToString:@"Energy"]) song = [[BGMusic alloc]initWithPath:[[NSBundle mainBundle] pathForResource:@"Energy" ofType:@"m4a"]]; else if([trackSelection isEqualToString: @"Enforcer"]) song = [[BGMusic alloc]initWithPath:[[NSBundle mainBundle] pathForResource:@"Enforcer" ofType:@"m4a"]]; else if([trackSelection isEqualToString: @"Continuum"]) song = [[BGMusic alloc]initWithPath:[[NSBundle mainBundle] pathForResource:@"Continuum" ofType:@"m4a"]]; else if([trackSelection isEqualToString: @"Pursuit"]) song = [[BGMusic alloc]initWithPath:[[NSBundle mainBundle] pathForResource:@"Pursuit" ofType:@"m4a"]]; [song setRepeat:YES]; counter = 0; } else [song close];} Anyone willing to help out? Thanks a bunch, Chuck

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  • InApp Purchase supported content types

    - by Chandan Shetty SP
    In InApp purchase guide i saw these are the supported content types - Digital Books,Virtual poker chips current games, In-game tool or accessory, etc... And non-supported - Physical books, Virtual poker chips for other games, In-game credits for virtual goods, etc... I didn't understand "In-game credits for virtual goods" what is this? In my game i am using some credits to skip certain levels, if credits are not available user can buy credits through inApp purchase then he can skip level... Is it valid supported content type for In-App purchase?

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  • Access custom label property at didSelectRowAtIndexPath.

    - by Mr. McPepperNuts
    I have a UILabel for each cell at cellForRowAtIndexPath. UILabel *cellLabel = [[UILabel alloc] initWithFrame:frame]; cellLabel.text = myString; I want to access that string "myString" at didSelectRowAtIndexPath using indexpath. NSString *anotherString = cell.textLabel.text; returns null. Now if at cellForRowAtIndexPath, I did something like cell.textLabel.text = theString; then the didSelectRowAtIndexPath returns the appropriate cell. My question is, how can I access the text in the UILabel I apply to the cell, at didSelectRowAtIndexPath? Also, logging the cell in didSelectRowAtIndexPath returns cell: <UITableViewCell: 0x5dcb9d0; frame = (0 44; 320 44); autoresize = W; layer = <CALayer: 0x5dbe670>> Edit: NSString *myString = [[results objectAtIndex:indexPath.row] valueForKey:@"name"]; //cell.textLabel.text = myString; CGFloat width = [UIScreen mainScreen].bounds.size.width - 50; CGFloat height = 20; CGRect frame = CGRectMake(10.0f, 10.0f, width, height); UILabel *cellLabel = [[UILabel alloc] initWithFrame:frame]; cellLabel.text = myString; cellLabel.textColor = [UIColor blackColor]; cellLabel.backgroundColor = [UIColor whiteColor]; cellLabel.textAlignment = UITextAlignmentLeft; cellLabel.font = [UIFont systemFontOfSize:14.0f]; [cell.contentView addSubview:cellLabel]; [cellLabel release]; return cell;

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  • Invocation of ViewDidLoad after initWithNibName

    - by live2dream95
    It appears that ViewDidLoad() is sent to a ViewController only after its View is physically displayed (i.e. via NavigationController pushViewController), and not immediately after initWithNibName(). Is this a behavior I can rely on? I would like to get the chance to set the member variables of my view so that all the members are valid by the time ViewDidLoad() is invoked.

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  • Is there any reason why we don't use subclasses of UIImageView ?

    - by gotye
    Hey everyone, I am currently trying to create a subclass of UIImageView in order to make it download its image from server asynchronously ;) I tried to do it by myself but I haven't gone very far yet :D Anyway, I looked around here and found this : AsyncImageDownload I had a look at the code and the first which springs to mind is : why subclassing a UIView and not a UIImageView ?!? Any thoughts ? Cheers mates, Gotye.

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  • NSAlert pops up for 3 times

    - by Marco
    Hello community i have a big problem. i implemented an NSAlert in the viewDidLoad() of my app: UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:alertMessage delegate:self cancelButtonTitle:ok otherButtonTitles:nil]; But the Alert pops up for 3 times, and then i can klick on it. Could it be that the viewDidLoad() starts for 3 times? This is the viewDidLoad in the rootViewController, that manages the views: - (void)viewDidLoad { Kundenkarte *kartenAnsicht = [[Kundenkarte alloc] initWithNibName:@"Kundenkarte" bundle:nil]; kartenAnsicht.rootViewController = self; kartenAnsicht.viewDidLoad; self.map = kartenAnsicht; [self.view addSubview:kartenAnsicht.view]; [kartenAnsicht release]; // [super viewDidLoad]; } kartenAnsicht is the view where the problem is. I hope someone could help me because my ideas are over!

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  • Custom pin animation - MKMapView

    - by user128647
    I have used pin images in application instead of standard pin, now i want to give animation (dropping effect as it was with standard pins) to custom pins. How can i provide dropping animation effect to custom pin images????

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  • How i display my scrollView on splash screen?

    - by Rajendra Bhole
    HI, I develop an application in which i want to implement the splash screen, on that splash screen i want to bind the scrollView and UIImage. My code as follow, -(void)splashAnimation{ window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, 320, 420)]; //scrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]]; scrollView = [[UIScrollView alloc] initWithFrame:[window bounds]]; scrollView.pagingEnabled = NO; scrollView.bounces = NO; UIImage *image = [UIImage imageNamed:@"splash.png"]; UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; imageView.userInteractionEnabled = NO; [scrollView addSubview:imageView]; [scrollView setDelegate:self]; //[scrollView release]; } - (void)applicationDidFinishLaunching:(UIApplication *)application { [self splashAnimation]; [self initControllers]; [window addSubview:[mainTabBarController view]]; [window makeKeyAndVisible]; } On my given code the one blank window comes up and stay on. I want to on that blank screen bind my splash.png.

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  • Block declared variable visible outside?

    - by fuzzygoat
    If I declare a variable within a block (see below) is there a way to specify that its visible outside the block if need be? if(turbine_RPM > 0) { int intResult = [sensorNumber:1]; NSNumber *result = [NSNumber numberWithInt:intResult]; } return result; or is the way just to declare outside the block scope? NSNumber *result; if(turbine_RPM > 0) { int intResult = [sensorNumber:1]; result = [NSNumber numberWithInt:intResult]; } return result; many thanks gary

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  • Position a UIView at the middle of a UITableView with CGRectZero frame

    - by Thomas Joulin
    Hi, I have a UITableViewController view a UITableView that I alloc/init with a frame of CGRectZero : self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped]; I want to add a view at the middle of the tableView (a loading view with a UIActivityIndicatorView and a UILabel), but I don't know how to position it, since I don't know the tableView frame. x = (self.tableview.frame.size.width - loadingView.frame.size.width) / 2.0; y = (self.tableview.frame.size.height - loadingView.frame.size.height) / 2.0; [loadingView setCenter:CGPointMake(x, y)]; I did init my tableView with CGRectZero frame so it can take the whole place available on screen (which it did), but I thought its frame would update or something. Any ideas ? Thanks !

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  • [iOS] becomeFirstResponder: automatically scroll to the UIControl that becomes first responder

    - by Manni
    I have a grouped UITableViewController with one section and many rows. Each cell consists of two elements: a UILabel with a description and a UITextField for an input. A form, I would say. On the bottom is a button "Next" the go to the next view. But before that, I validate the UITextField's: if the user hasn't filled a field, this field should get the focus, so that the user sees that he needs to enter something. I tried with this: [inputField becomeFirstResponder]; Remember, the button I pressed is on the bottom of my view and imagine that the UITextField is on the top. In this situation, the field doesn't get the focus because it is too far away. Now when I scroll up slowly and the field gets visible, the field becomes first responder and gets the cursor :-) Conclusion: The becomeFirstResponder worked, but does not exactly do what I wanted to. I don't want to scroll up with my finger, the field should get the focus and visible automatically. Is there any way to "jump" directly to my field? Use an alternative to becomeFirstResponder? Scroll to my field automatically? Thanks for your help!

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  • NSMutableArray withObject(UIImageView *)

    - by pureman
    I am trying to load an NSMutableArray with UIImageViews. Everything is going fine with that. Unfortunately, I have no idea how to use the objects when they are in the mutable array. Here is some code: UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; NSMutableArray *array = [NSMutableArray new]; [array loadWithObject:(UIImageView *)imageView]; [imageView release]; That kind of sets up what I've done. Here's what I want to do: [array objectAtIndex:5].center = GCRectMake(0, 0); but that doesn't work. How can I do this??

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  • UIWebView: webViewDidStartLoad/webViewDidFinishLoad delegate methods not called when loading certain URLs

    - by Dia
    I have basic web browser implemented using a UIWebView. I've noticed that for some pages, none of the UIWebViewDelegate methods are called. An example page in which this happens is: http://www.youtube.com/user/google. Here are the steps to reproduce the issue (make sure you insert NSLog calls in your controller's UIWebViewDelegate methods): Load the above youtube URL into the UIWebView [notice that here, the UIWebViewDelegate methods do get called when the page loads] Touch the "Uploads" category on the page Touch any video in that category [issue: notice that a new page is loaded, but none of the UIWebView delegates are called] I know that this is not an issue of UIWebView's delegate not being set properly, since the delegate methods do get invoked when loading other links (e.g. if you try clicking on a link that takes you outside of youtube, you'll notice the delegate methods getting called). My gut feeling initially was that it might be because the page is loaded using AJAX, which may not invoke the delegate method. But then when I checked Safari, it did not exhibit this problem, so it must be something on my side. I've also noticed that Three20's TTWebController has the exact same issue as I'm having. But the problem that arises from this issue is that without the delegate methods called, I'm unable to update the UI to enable/disable the back and forward browsing buttons when new requests are loaded. And idea why this is happening or how can I work around it to update the UI when a new request is made?

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  • Load remote csv into CHCSVParser

    - by Matt
    Hey guys. I'm using Dave DeLong's CHCSVParser to parse a csv. I can parse the csv locally, but I cannot get it load a remote csv file. I have been staring at my MacBook way too long today and the answer is right in front of me. Here's my code: NSString *urlStr = [[NSString alloc] initWithFormat:@"http://www.somewhere.com/LunchSpecials.csv"]; NSURL *lunchFileURL = [NSURL URLWithString:urlStr]; NSStringEncoding encoding = 0; CHCSVParser *p = [[CHCSVParser alloc] initWithContentsOfCSVFile:[lunchFileURL path] usedEncoding:&encoding error:nil]; [p setParserDelegate:self]; [p parse]; [p release]; Thanks for any help that someone can give me.

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  • Quartz2d vector images vs OpenGL vector description?

    - by tbarbe
    How big of a difference is the description language of Quartz2d to OpenGL ES? It seems they are similar in description power... except that Quartz is mostly 2d and that OpenGL is out of the box 3d ( but can be made 2d focused ). Are the mappings from 2dQuartz to 2d OpenGL ES that different? Im sure there must be differences in some specific features that might be handled differently on one vs another... but to do a translator? Anyone have experience with both OpenGL and Quartz2d have some insights?

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  • NSKeyedUnarchiver chokes when trying to unarchive more than one object

    - by ajduff574
    We've got a custom matrix class, and we're attempting to archive and unarchive an NSArray containing four of them. The first seems to get unarchived fine (we can see that initWithCoder is called once), but then the program simply hangs, using 100% CPU. It doesn't continue or output any errors. These are the relevant methods from the matrix class (rows, columns, and matrix are our only instance variables): -(void)encodeWithCoder:(NSCoder*) coder { float temp[rows * columns]; for(int i = 0; i < rows; i++) { for(int j = 0; j < columns; j++) { temp[columns * i + j] = matrix[i][j]; } } [coder encodeBytes:(const void *)temp length:rows*columns*sizeof(float) forKey:@"matrix"]; [coder encodeInteger:rows forKey:@"rows"]; [coder encodeInteger:columns forKey:@"columns"]; } -(id)initWithCoder:(NSCoder *) coder { if (self = [super init]) { rows = [coder decodeIntegerForKey:@"rows"]; columns = [coder decodeIntegerForKey:@"columns"]; NSUInteger * len; *len = (unsigned int)(rows * columns * sizeof(float)); float * temp = (float * )[coder decodeBytesForKey:@"matrix" returnedLength:len]; matrix = (float ** )calloc(rows, sizeof(float*)); for (int i = 0; i < rows; i++) { matrix[i] = (float*)calloc(columns, sizeof(float)); } for(int i = 0; i < rows *columns; i++) { matrix[i / columns][i % columns] = temp[i]; } } return self; } And this is really all we're trying to do: NSArray * weightMatrices = [NSArray arrayWithObjects:w1,w2,w3,w4,nil]; [NSKeyedArchiver archiveRootObject:weightMatrices toFile:@"weights.archive"]; NSArray * newWeights = [NSKeyedUnarchiver unarchiveObjectWithFile:@"weights.archive"]; What's driving us crazy is that we can archive and unarchive a single matrix just fine. We've done so (successfully) with a matrix many times larger than these four combined.

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  • Starting a cocos2d game with initial gameplay as background

    - by boz
    Hi All, Id like to start my game, with the initial game play layout as the background, with a buttons layer over the top with maybe 'Tap to start' and a high score etc. and similarly, when the game finishes, id like to just 'pause' the final game play layout and overlay a game over menu of sorts. I tried calling [[CCDirector sharedDirector] pause] as the last line of the appDidFinishLaunching which didnt seem to have any effect. Is there a better way trying to do this? I dont really like my initial approach.

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