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  • How to make a table view which can be scrolled for ever?

    - by mystify
    I have a set of 100 rows, pretty similar to values which can be selected in a picker. When the user scrolls the table, I want the rows to be appended like an forever-ongoing assembly-belt. So when the user scrolls down and reaches the row 100, and scrolls even further, the table view will show again row 1, and so on. Reverse direction same thing. My thoughts: don't display scroll indicators (they would make not much sense, probably) what value to return in the numberOfRows delegate method? This infinity constant? in cellForRowAtIndexPath: simply wrap the index around when it exceeds bounds?

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  • masked the pasword input to UITexfield

    - by user262325
    Hello everyone I hope to mask the text input to UITextFiled as: "ABCDE" to "*****" below are my codes without function - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { int l=[textField.text length]; range=NSMakeRange(1, l ); string=[[[NSString alloc]initWithString:@"*"] autorelease]; return YES; } Welcome any comment Thanks interdev

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  • not saving when using setDidReceiveDataSelector

    - by coder4xc
    i want to download a file and show the progress bar i was able to do this. now , i want to show the progress value in a label and use this code to progress init and update label : [queue setDelegate:self]; [queue setRequestDidFinishSelector:@selector(updateLabel)]; [queue setDownloadProgressDelegate:progress]; [queue setShowAccurateProgress:YES]; ASIHTTPRequest *request; request = [ASIHTTPRequest requestWithURL:url]; [request setDelegate:self]; [request setTemporaryFileDownloadPath:[filePath stringByAppendingString:@".download"]]; [request setAllowResumeForFileDownloads:YES]; [request setDidFinishSelector:@selector(updateLabel)]; [request setDidReceiveDataSelector:@selector(updateLabel)]; [request setShouldContinueWhenAppEntersBackground:YES]; [request setShouldAttemptPersistentConnection:NO]; [request setDownloadDestinationPath:filePath]; [queue addOperation:request]; [queue go]; but not save in the destination path ! and when i clear this code :  [request setDidReceiveDataSelector:@selector(updateLabel)]; saving done ! what is problem ? i want to update label text when progress value changed

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  • Adding methods to an Objective C class interface is optional?

    - by Steve the Plant
    Coming from a C++ background, one thing that confuses me about Objective C is the fact that you can add a method to a class without actually specifying it in the class interface. So I had a barrage of questions: Why would someone choose to not add the method in the class interface? Is it simply because of visibility? Methods without a declaration in the interface are private? Is declaring methods in a class interface just optional? Is it different for overriding a base class' method?

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  • Set a navigation controller without an app delegate

    - by Rodrigo
    I would like to show a Navigation Controller after clicking a button. Every tutorial assumes the navigation controller will be the first screen so it links it to the App Delegate, but App delegate only appears at MainWindow.xib. How do you guys add a navigation controller to a view different than the MainWindow? Thanks!

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  • NSDateFormatter Does not convert correctly

    - by deamonsarea
    Hi, I have a NSString which is passed from an xml feed........ NSString *strDate =@"Thu, 22 Apr 2010 10.30 am CEST"; I'm currently using this code to format the date........ NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"EEE, dd MMM yyyy hh:mm a vvvv"]; NSDate *myDate = [dateFormatter dateFromString:date]; [dateFormatter setDateFormat:@"HH"]; NSLog(@"%@", [dateFormatter stringFromDate:myDate]); I want to format my string only to display only hours and currently I'm getting value like this. strDate =@"2010-04-10 14:00:00 +0530"; Can anyone please help me with this?......

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  • Update query in sqlite3 problem

    - by user271753
    [sqlite executeQuery:@"UPDATE UserAccess SET Answer ='Positano';"]; NSArray *query2 = [sqlite executeQuery:@"SELECT Answer FROM UserAccess;"]; NSDictionary *dict = [query2 objectAtIndex:0]; NSString *itemValue = [dict objectForKey:@"Answer"]; NSLog(@"%@",itemValue); It does print Positano at this point .. But when I just print without the update query again . I get the old entry which is Paris. What am I doing wrong ??? I am using http://th30z.netsons.org/2008/11/objective-c-sqlite-wrapper/ wrapper. Regards , Novice

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  • NSInvocation: object does not implement methodSignatureForSelector

    - by Sam V
    I have this weird crash that only happens when running the app on the device (doesn't happen in the Simulator). It seems like the problem surfaces out of nowhere, as I haven't changed anything on that particular class. I had the very same issue a few days ago, and I ended up fixing it by duplicating the class, renaming it, and changing the referenced class — I haven't changed a single bit of code. So I'm trying to understand why it's doing this. I've read somewhere that usually you get this console error when the object isn't a subclass of NSObject (but it is!). Here's the exact console error message: *** NSInvocation: warning: object 0x679e0 of class 'FFProximityPickerView' does not implement methodSignatureForSelector: -- trouble ahead *** NSInvocation: warning: object 0x679e0 of class 'FFProximityPickerView' does not implement doesNotRecognizeSelector: -- abort And then it crashes. I'd be very thankful for anyone who can help me on this.

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  • How to calculate the audio file duration in core audio?

    - by mystify
    I have this info variable which is of this type: struct AudioStreamBasicDescription { Float64 mSampleRate; UInt32 mFormatID; UInt32 mFormatFlags; UInt32 mBytesPerPacket; UInt32 mFramesPerPacket; UInt32 mBytesPerFrame; UInt32 mChannelsPerFrame; UInt32 mBitsPerChannel; UInt32 mReserved; }; How could I calculate the total duration of the audio file, in seconds?

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  • UIAcceleration filtering

    - by Ilya
    Hi, I found the following piece of code in apple guidelines: - (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration { //Use a basic low-pass filter to only keep the gravity in the accelerometer values accel[0] = acceleration.x * kFilteringFactor + accel[0] * (1.0 - kFilteringFactor); accel[1] = acceleration.y * kFilteringFactor + accel[1] * (1.0 - kFilteringFactor); accel[2] = acceleration.z * kFilteringFactor + accel[2] * (1.0 - kFilteringFactor); } What does it exactly do? What is this low-pass filter? Why do I have to apply it? Thank you in advance.

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  • Tab-Bar not hiding on all views

    - by Sheehan Alam
    I have a tab-bar controller that loads a RootView. The RootView has 4 buttons that will load a UITableView I don't want my tab-bar to be visible in the RootView so I added the following code: -(void)viewDidLoad{ self.hidesBottomBarWhenPushed = YES; } When I initially load the app the tab-bar doesn't appear, but when I click on a button, and go back to the RootView the tab-bar still appears. I have tried placing this code in viewWillAppear and other application lifecycle methods but no luck.

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  • Terminating app due to uncaught exception / / SIGABRT // C++ please help!

    - by user282076
    I have just finished one of my apps when I got this message. I cannot for the life of me work out what is wrong. (gdb) continue 2010-02-26 14:05:51.443 BrainTester[2638:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController _loadViewFromNibNamed:bundle:] was unable to load a nib named "SplitSecondViewController"' 2010-02-26 14:05:51.452 BrainTester[2638:207] Stack: ( 861696817, 860329709, 861252493, 861252395, 835170725, 835170141, 835074651, 13515, 834774231, 834773467, 835014237, 835012689, 835011495, 861063661, 861449261, 861447005, 834770767, 834765939, 11025, 10920 ) terminate called after throwing an instance of 'NSException' Program r eceived signal: “SIGABRT”. (gdb) If someone can help, any help is appreciated.

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  • Copy/Paste functionality in UITableViewController.

    - by Simon
    Hi.. I have a UITableViewController. I want to pop the copy/paste menu up when the user touches a cell. How to implement this functionality. Can someone help me. I tried this code, UIMenuController *theMenu = [UIMenuController sharedMenuController]; [theMenu setTargetRect:CGRectMake(10, 200, 100, 40) inView:[self tableView]]; [theMenu setMenuVisible:YES animated:YES]; But it doesn't work. My question is, What CGRect I have to pass as the setTargetRect parameter? Do I need to call SetNeedsDisplayInRect in my TableViewController? What else to do to make this work?

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  • Paging a UIScrollView with a large PDF

    - by Fousa
    I try to create a simple UIScrollView with paging. And I want to be able to scroll through a large PDF document, but this gives me some problems... I tried the following options: Convert all the PDF pages to UIImages at startup, this works, but is very slow on start Manually drawing the PDF page in the drawRect, but yet again this was slow... And I prefer not to load everything at startup but to do it during the usage. Did anyone did this recently? Can't seem to find a nice example project. Thnx! Jelle

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  • Touch and Drag from one view to another

    - by jollyCocoa
    Hi all! I've search for some clues on this problem without much success. Hope someone can kick me in the right direction. I am prototyping a couple of apps where I need to design my own GUI. The GUI is made up by two separated UIViews where one of them contains a small thumb of an image. I want to be able to drag this thumb from the first view to the other. Simple as that! But I haven't figured out how this is done. Here is the exact flow I am looking for: touch the thumb animate a small enlargement of the thumb drag the thumb to the other UIView drop the thumb animate a shrink of the thumb Not particularly strange, but the thumb remains related to the first view all the time. I've tried to move the thumb via the first views superview and then back to the second view, but with no luck.

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  • UiButton / IBAction - link from a RootView to mainView in Storyboard

    - by webschnecke
    I try to call the main ViewController on my storyboard. In my app there is a additional .h, .m file with no xib or storyboard. In this .m file T craeted a button: UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button addTarget:self action:@selector(home:)forControlEvents:UIControlEventTouchDown]; [button setTitle:@"Show View" forState:UIControlStateNormal]; button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0); [self.view addSubview:button]; NSLog(@"Home-Button line 645"); This button should link to my main ViewController in the Storyboard. The view has the identifier HauptMenu. I got no error, but the view doesnt change to my main ViewController. What is wrong? - (IBAction)home:(id)sender { NSLog(@"Button was tapped"); ViewController *viewController = [self.storyboard instantiateViewControllerWithIdentifier:@"HauptMenu"]; NSLog(@"1"); [viewController setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal]; NSLog(@"2"); [self.navigationController pushViewController:viewController animated:NO]; [viewController release]; NSLog(@"3"); }

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