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• Is there a way to know when the index on uitableview is actually used?

  - by NoviceiPhoneProgrammer

  Is there a way to know when the index on uitableview is actually used? I can’t find any methods in the Apple documentation, but I was wondering if anyone else knows anything. I would basically like to make an animation in my table view that changes depending on what section is selected in the index, and I have no idea how to do this without accessing the table view index. Any help is greatly appreciated. Thanks.

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• How do I get more control of UIImageView animation?

  - by Pickles

  I'm trying to display a series of images in a animation where the duration between the images changes frame to frame. I can successfully animate images where the duration is the same. I've looked into subclassing UIImageView but it doesn't seem to allow you access anything that could be helpful. I've also looked into subclassing UIView directly but it seems like I'd have to write a lot of the stuff that UIImageView already does for me. Is there a way to do this with UIImageView? Or if I am going to have to build my own UIView animation can someone point me the right direction to get started? Thanks.

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• Is it possible to Prevent TO fileld to be edit in MFMailComposeViewController

  - by mihirpmehta

  in my Application i am using MFMailComposeViewController for emails... I am Adding to Field in it programmaticly... I want To prevent user to edit the TO field, User can't change TO field's email address... I am not able to find neither i know if it is possible or not It is not necessary but still code is NSArray *arr = [NSArray arrayWithObject:Emailstr]; MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init]; controller.mailComposeDelegate = self; [controller setToRecipients:arr]; [controller [controller setMessageBody:@"Hello there." isHTML:NO]; [self presentModalViewController:controller animated:YES];

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• How can I create a custom button in cocos2d with custom label in it ?

  - by srikanth rongali

  I need to create a button. And it should have a label on it. I need to write selectors for the button. I tried with CCMenuFont, but I could not add custom label on it or I could not set the size of the button? Can we set the size of the button by using CGRectMake ?

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• Image animation over CGContextDrawPDFPage

  - by BittenApple

  I have a pdf page displayed with CGContextDrawPDFPage. I want to keep this page shown and have an image slide in from top over this page, just as it can be seen in the iBooks application. It's a book, the sliding image is a bookmark that slides in when you are about to close the book. What is the best way to go about implementing this?

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• Is there a way to dismiss an alertview automatically after some time?

  - by Daniel

  I'm looking for a way, to automatically dismiss an alert view after some time or after a task is done. Is there a possibility? (or another way to show a message for some time?)

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• UItextView in UITableview, autocorrection bubble not visible

  - by f0rz

  Hello! I have a UITableView with custom cells. The cells containing one UITextView each and the cell is resizing during user type text in the TextView. My problem is when user is on first row in a TextView autocorrection bubbles wont be visible in the current cell. Is there any workaround or can someone point me to another direction?

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• How can I make text in a UILabel non-centered?

  - by Sheehan Alam

  I have a UILabel: descriptionLabel = [[UILabel alloc] initWithFrame:CGRectMake(200, 30, 130, 150)]; [descriptionLabel setFont:[Utils getSystemFontWithSize:14]]; [descriptionLabel setBackgroundColor:[UIColor clearColor]]; [descriptionLabel setTextColor:[UIColor whiteColor]]; descriptionLabel.numberOfLines = 0; descriptionLabel.lineBreakMode = UILineBreakModeWordWrap; [self addSubview:descriptionLabel]; If the text is only 1 line long it will appear in the middle of the label. Is there anyway I can have the text display from the top left corner of the label instead of the middle center?

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• Is there a way to detect non-movement (touch events) ?

  - by hyn

  Is there a way to detect a finger's non-movement by using a combination of UITouch events? The event methods touchesEnded and touchesCancelled are only fired when the event is cancelled or the finger lifted. I would like to know when a touch has stopped moving, even while it is still touching the screen.

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• queued view updates not happening when performSelector afterDelay:0 used

  - by JosephH

  Hi all, I have an app that performs some calculations based on data arriving on a socket or local user interaction. I want to show an 'activity spinner' whilst the calculation happens. spinner = [[UIActivityIndiactorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; [spinner setCenter:self.view.center]; [self.view addSubview:spinner]; [spinner startAnimating]; [self performSelector:@selector(doCalcs) withObject:nil afterDelay:0]; This works well, except in the case where the code is run as a result of a message arriving over the network. I'm using http://code.google.com/p/cocoaasyncsocket/ to handle sockets and the code is running in the onSocket:didReadData:withTag: method. 'doCalcs' takes a few seconds. The spinner doesn't appear whilst it's running. If I change afterDelay:0 to afterDelay:1 then the spinner does appear the whole time doCalcs is running, but with the downside that it takes an extra second. So it seems the code is all correct, but for whatever reason the spinner isn't getting a chance to get on screen before doCalcs runs. Any suggestions would be most welcome.

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• Converting &amp; to & in Objective-C

  - by nbojja

  Hi All, I have a URL string in the following format. http://myserver.com/_layouts/feed.aspx?xsl=4&amp;web=%2F&amp;page=dda3fd10-c776-4d69-8c55-2f1c74b343e2&amp;wp=476f174a-82df-4611-a3df-e13255d97533 I want to replace &amp; with & in the above URL. My result should be: http://myserver.com/_layouts/feed.aspx?xsl=4&web=%2F&page=dda3fd10-c776-4d69-8c55-2f1c74b343e2&amp;wp=476f174a-82df-4611-a3df-e13255d97533 Can someone post me the code to get this done? Thanks

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• What method of UIView gets called when instantiated from a NIB?

  - by retailevolved

  I have a simple custom view that is connected via outlet to a NIB. For this particular view, there are actions that I would like to perform on the view when it is initialized, no matter what NIB it is on. Trouble is, neither the (id)init or the (id)initWithFrame:(CGRect)frame methods are getting called on the custom view. Which method gets called on a UIView when it is instantiated from a NIB? I would just use the view controller and viewDidLoad method except that this particular view appears on a lot of different NIBs.

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• uiscrollview not scrolling horizontally

  - by Futur

  My UIScrollView below is not scrolling horizontally, Please help me here.. FirstView = [[UIView alloc] initWithFrame:CGRectMake(60, 0, 100, 150)]; [FirstView setBackgroundColor:[UIColor clearColor]]; SecondView = [[UIView alloc] initWithFrame:CGRectMake(320+60, 0, 100, 150)]; [SecondView setBackgroundColor:[UIColor clearColor]]; HolderView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 1000, 150)]; scrHorizontalScroll = [[UIScrollView alloc]initWithFrame:HolderView.frame]; [scrHorizontalScroll setBackgroundColor:[UIColor redColor]]; [scrHorizontalScroll setContentSize:CGSizeMake(999, 150)]; [scrHorizontalScroll setScrollEnabled:YES]; [HolderView addSubview:scrHorizontalScroll]; The HolderView is not scrolling horizontally but which happen, please help

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• viewWillAppear for subviews

  - by nan

  I have UIScrollView with multiple UIVIew subviews. I would like to update the data that is displayed by each UIView when they appear in the visible portion of the UIScrollView. What is the callback that gets triggered? I tried viewWillAppear, but it does not seem to get called. Thanks. :)

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• Writing the code iby dividing it into more files.

  - by srikanth rongali

  My problem is, I need a background image, a sprite(with animation) on left edge, another sprite(with animation) at other edge, a number count animation 1-2-3 at middle. I got all these when I wrote all in same file.(like [self addChild:label], [self addChild:sprite].., But in this it needs touch enables for both sprites separately, and touchDisabled to the remaining screen. So thought of writing in different files. But now it is not working. I kept one sprite, background image, numbercount in one file and another spritr in other file. Either I am getting the second sprite or the (sprite+background+numberCount) is displayed. This is my problem. plz give me solution. Thank You

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• WebView not responding when called from a method

  - by AragornSG

  I have an app with tabbar and webview. I'm trying to make the app come back to default url each time user taps the bar. Right now I'm intercepting taps and launching a method, however it's not affecting my webview. The same syntax for calling webview from awakeFromNib works, so I don't have a clue what's up. I suspect it's something to do with how I call the method, but I don't know what. Here is the code: #import "SecondViewController.h" @implementation SecondViewController - (void)awakeFromNib { NSString *loadURL = [NSString stringWithFormat:@"http://pageurl"]; // [secondView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:loadURL]]]; SecondViewController *ptr = [[SecondViewController alloc] init]; [ptr goToPage]; } - (void) goToPage { NSLog(@"go to page"); NSString *newURL = [NSString stringWithFormat:@"http://pageurl"]; [secondView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:newURL]]]; } Thanks fot your help!

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• Saving core data in a thread, how to ensure its done writing before quitting?

  - by Shizam

  So I'm saving small images to core data which take a really short amount of time to save, like .2 seconds but I'm doing it while the user is flipping through a scroll view so in order to improve responsiveness I'm moving the saving to a thread. This works great, everything gets saved and the app is responsive. However, there is one thing in the core-data + multithreading doco that worries me: "In Cocoa, only the main thread is not-detached. If you need to save on other threads, you must write additional code such that the main thread prevents the application from quitting until all the save operation is complete." Ok, how do you do that? It only needs to last ~ .2 seconds and its rarely going to happen since the chance of the app quitting as something is saving is very low. How do I run something on the main thread that'll prevent the app from quitting AND not block the gui? Thanks

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• Error with custom Class definition in protocol

  - by Greg

  I'm trying to set up a custom delegate protocol and am getting a strange error that I don't understand. I wonder if someone could point out what I'm doing wrong here (I'm still new to Ob-C and protocol use)... The situation is that I've built my own URLLoader class to manage loading and parsing data from the internet. I'm now trying to set up a protocol for delegates to implement that will respond to the URLLoader's events. So, below is my protocol... #import <UIKit/UIKit.h> #import "URLLoader.h" /** * Protocol for delegates that will respond to a load. */ @protocol URLLoadResponder <NSObject> - (void)loadDidComplete:(URLLoader *)loader; - (void)loadDidFail:(URLLoader *)loader withError:(NSString *)error; @end However, I'm getting the following error for both method signatures: Expected ')' before 'URLLoader' I feel like I must be overlooking something small and silly. Any help folks could offer would be greatly appreciated! Whoops ... it was pointed out that I should include URLLoader.h. Here it is: #import <Foundation/Foundation.h> #import "URLLoadResponder.h" /** * URLLoader inferface. */ @interface URLLoader : NSObject { NSString *name; NSString *loadedData; NSMutableData *responseData; NSObject *delegate; BOOL _isLoaded; } @property (nonatomic, retain) NSString *name; @property (nonatomic, retain) NSString *loadedData; @property (nonatomic, retain) NSObject *delegate; - (void)loadFromURL:(NSString *)url; - (void)addCompleteListener:(id)observer selector:(SEL)sel; - (void)removeCompleteListener:(id)observer; - (void)parseLoadedData:(NSString *)data; - (void)complete; - (void)close; - (BOOL)isLoaded; + (NSURL *)makeUrlWithString:(NSString *)url; + (URLLoader *)initWithName:(NSString *)name; @end

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• textFieldShouldBeginEditing + UIKeyboardWillShowNotification + OS 3.2

  - by user193545

  I have multiple textfields on a UIView. I resign for a previous textField in textFieldShouldBeginEditing method, where following sequence of events are performed UIKeyboardWillHideNotification is received corresponding to that field where the keyboard for the previous field is hidden. the method textFieldShouldBeginEditing returns a YES and then UIKeyboardWillShowNotification is received where the keyboard for the current field is displayed. However, in OS 3.2 even though textFieldShouldBeginEditing returns a YES, UIKeyboardWillShowNotification for the current field is not received. The logic works for OS < 3.2 Any ideas where I might be doing wrong?

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• Draggable cards (touch enumeration) issue

  - by glitch

  I'm trying to let a player tap, drag and release a card from a fanned stack on the screen to a 4x4 field on the board. My cards are instantiated from a custom class that inherits from the UIImageView class. I started with the Touches sample app, and I modified the event handlers for touches to iterate over my player's card hand instead of the 3 squares the sample app allows you to move on screen. Everything works, until that is, I move the card I'm dragging near another card. I'm really drawing a blank here for the logic to get the cards to behave properly. Here's my code: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSUInteger numTaps = [[touches anyObject] tapCount]; if(numTaps = 1) { for (UITouch *touch in touches) { [self dispatchFirstTouchAtPoint:[touch locationInView: self.boardCardView] forEvent:nil]; } } } -(void) dispatchFirstTouchAtPoint:(CGPoint)touchPoint forEvent:(UIEvent *)event { for (int i = 0; i<5; i++) { UIImageView *touchedCard = boardBuffer[i]; if (CGRectContainsPoint([touchedCard frame], touchPoint)) { [self animateFirstTouchAtPoint:touchPoint forView:touchedCard]; } } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { NSUInteger touchCount = 0; for (UITouch *touch in touches){ [self dispatchTouchEvent:[touch view] toPosition:[touch locationInView:self.boardCardView]]; touchCount++; } } My questions are: How do I get the touch logic to disallow other cards from being picked up by a dragging finger? Is there anyway I can only enumerate the objects that are directly below a player's finger and explicitly disable other objects from responding? Thanks!

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• Display keyboard above toolbar?

  - by Sheehan Alam

  I have a view with a bottom toolbar and a UIWebview that is loading an HTML page with some textboxes. Is there anyway when the user clicks on a textbox, the keyboard appears above the toolbar, that way it doesn't hide its buttons?

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• How to use accessors within the same class in Objective C?

  - by Azeworai

  Hi, I have a few properties defined in my header file like so @property (assign) bool connectivity_N; @property (assign) bool isConnected_N; In my implementation file I have an init and the synthesized properties like so @implementation Map @synthesize connectivity_N; @synthesize isConnected_N; a init to set the initial values like so -(id) init { if( (self=[super init]) ) { //initialise default properties self.connectivity_N=NO; self.isConnected_N=NO; } return self; } I'm running into an error that states Error: accessing unknown 'connectivity_N' class method. In this public method within the class +(bool) isConnectable:(directions) theDirection{ bool isTheDirectionConnectable= NO; switch (theDirection) { case north: isTheDirectionConnectable= self.connectivity_N; break; I'm not sure why is this so as I'm trying to grab the value of the property. According to the apple developer documentation "The default names for the getter and setter methods associated with a property are propertyName and setPropertyName: respectively—for example, given a property “foo”, the accessors would be foo and setFoo:" That has given me a clue that I've done something wrong here, I'm fairly new to objective C so would appreciate anyone who spends the time to explain this to me. Thanks!

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• How to use the variable declared in one class in another class in Obj C.

  - by srikanth rongali

  I have a NSDate *date1 in class1 implementation file(I initialized it as Global variable). I have NSDate *date2 in class 2 implementation file (initialized it as Global variable). I need to calculate the NSTimeInterval between the two dates in class 2. But I could not do it. I could not access date1 in this class. It is giving error as (date2 undeclared). Please give me help in how to call other class variables in this class. Thank you.

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• Pushing UIViewController onto a UINavigationController

  - by Gregg

  The other day I asked about using a UINavigationController as a child of a UIViewController. I got that working via the answer. Now what I'm trying to do is push a controller onto the nav stack. When a table cell is touched, I do the following: - (void) showSetup { NSLog(@"Showing Setup"); SetupViewController *controller = [[SetupViewController alloc]initWithNibName:@"SetupViewController" bundle:nil]; self.setupViewController = controller; self.setupViewController.title = @"Setup"; [self.navigationController pushViewController:self.setupViewController animated:YES]; [controller release]; } I can see the log statement in my console, but the view never changes. Am I missing something?

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• Objective C: Include class and call method

  - by Nic Hubbard

  I have built a class which has a few methods in it, once of which returns an array, lets call this class A. I have a second class, class B, which I would like to use to call the method from class A. But, now how do I call that method from class A and store what is returned in a var in class B? Do I have to initiate the class? I have made sure to include the .h file from class A into class B. Thanks for helping a newbie.

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