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• How to achieve the same effect like the unlock slider in the welcome screen of iPhone OS?

  - by mystify

  I need to do something similar, where an animation highlights the text of a button to show that it must be slided to do something. Just like that unlock thing on the iPhone. How is that done? Is there a tutorial how to achieve this effect?

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• Not receiving touchesEnded/Moved/Cancelled after adding subView

  - by Sam

  Title more or less says it all. In response to a touchesBegan event, my UIViewController recolours itself and adds some subviews. It never receives the touchesEnded. I guess because the added subviews are somehow intercepting the event. I tried calling resignFirstResponder on the subviews to no avail. The code works fine when I don't add the child views and the touch events are called as normal. Any ideas? Thanks

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• Core Foundation equivalent for NSLog

  - by invariant

  What is the closest Core Foundation function to the functionality of NSLog?

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• audio power on AudioQueue

  - by Tomoyuki

  Hi everyone. I'm now creating an Application using speech recognition.To check the Audio Power coming in through the microphone, I wrote a method as follows. -(void)checkPower(AudioqueRef)queue{ UInt32 expectedSize= sizeof(AudioQueueLevelMeterState); AudioQueueGetProperty(queue, kAudioQueueProperty_CurrentLevelMeter, audioLevels, expectedSize); NSLog(@"average:%f peak:%f",audioLevels.mAveragePower,audioLevels.mPeakPower); } I found that sometimes mAveragePower was larger than mPeakPower, and when mAveragePower was 1.0, in other words, averagePower is regarded as max, mPeakPower was lower than 1.0. I think that generally this result is inpossible. please Let me know if you have any information about sound power on CoreAudio. thanks.

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• How to delete a cell in UITableView by using custom button in cell ?

  - by srikanth rongali

  I have UITableView. I customized the cell height (increased). I have 4 labels(UILabel) and 1 image(UIImage) and 3 buttons (UIButton). one of the button is delete button. By touching the cell or button(play button) on the image a video is loaded and played. I need to delete the cell by touching delete button. If I touched the delete button the corresponding video is deleted from library . But, how to delete the cell and all remaining data in it ? I am not able to delete the cells or the data in the cells. How to do it ? I used these. But the control is not entering in to second method committedEditingStyle: - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { return YES; } - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { } } Thank you. The following image shows the delete button of my program.

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• Where should I put some code for loading application data?

  - by cgp

  I have a tab-bar and navigation controller application (like Youtube app or Contacts app). Where is the correct place to have the code for loading some data from the web? These data are necessary for all the tabs of the Tab Controller and the app can't display anything before all data are downloaded and parsed from the app (except a loading indicator view of course). Up to now I put it in the AppDelegate but it somehow doesn't feel right.. What's the correct way to do it? Thanks!

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• Binding value for NSTableView, but tooltip gets set as well

  - by Mark

  I've set up an NSTableView in Interface Builder to be populated from an NSArray. Each value of the array represents one row in the table. The value is bound correctly, but as a side effect, the table cell's tooltip is set to the string representation of the bound object. In my case, the NSArray contains NSDictiorany objects and the tooltip looks like it could be the [... description] output of that dictionary. Very ugly... I don't want the tooltip to be set at all. I have other tables that have plain NSString values bound to them and they don't have a tooltip set automatically. Is there some Interface Builder magic going on? I tried to start with a blank project - same problem. I should add that the table cell is a custom implementation of NSTextFieldCell that uses an NSButtonCell instance to draw an image and a label into the table. The values are retrieved from the dictionary bound as value. Why is the tooltip set when I only bind the "value" attribute? Thanks in advance!

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• Problem to get a Substring from a String?

  - by raaz

  Hi all, i have a little question ,i have a NSString object (\n "1 Infinite Loop",\n "Cupertino, CA 95014",\n USA\n) and i want the Cupertino from this string Till now i have used stringByReplacingOccurrencesOfString: and able to get "1InfiniteLoop""CupertinoCA95014"USA But still not able get Cupertino. Do any other method able to solve this problem?

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• How can get the values of NSDictionary using keys where the dictionaries are stored in NSArray ?

  - by srikanth rongali

  I have created 5 NSDictionary's. I stored them in NSArray. I need to get the values stored in NSDictionaries. How can do it ? I tried calling [[array objectAtIndex:i]objectForKey:key1]. But, it is crashing by giving the message:unrecognized selector sent to instance How to get the data ?

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• Preprocess strings file during Xcode build

  - by stigi

  Hello, I know there's a way to preprocess my info.plist file, but is there a similar way to process strings files inside my Settings.bundle? My problem: I have an iPhone app and I want the the user to know about the currently installed version. I do this by displaying it in the apps settings. Now every time i change the bundle version in my info.plist i also have to change the version in the Root.strings in the Settings.bundle. I could run a script action that updates it, but it would be nice to use the preprocessor since I could do even more fun things with it. Thanks!

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• Objective-C retain counts in dealloc

  - by Michael Waterfall

  I'm seeing something fairly strange here, I've got breakpoints set in various dealloc methods in my app, and on inspection, the retain counts of the object self varies from 1 to 0. When dealloc is called, will the retain count of the object be set to 0 already? I'm using print (int) [self retainCount] in the console to test this. The 0's seem to only appear in the dealloc of my NSOperation's that are being run in an NSOperationQueue. Any idea why this is?

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• What's the best way to call an IBAction from within code?

  - by Rob

  Say for instance I have an IBAction that is hooked up to a button in interface builder. - (IBAction)functionToBeCalled:(id)sender { // do something here } Within my code, say for instance in another method, what is the best way to call that IBAction? If I try to call it like this, I receive an error: [self functionToBeCalled:]; But, if I try to call it like this (cheating a bit, I think), it works fine: [self functionToBeCalled:0]; What is the proper way to call it though?

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• Conditionally disabling menu item

  - by Rui Pacheco

  Are menu items under File "special"? I've deleted Open Recent... from my application menu but it still shows up when I run the application. I've tried to clean all targets, I deleted other menu items to make sure there's no caching going on but I still can't make Open Recent... disappear at run time.

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• How do I create rows with alternating colors for a UITableView on iPhone?

  - by Mat

  Hi all, i would to have alternate 2 colors of rows, like the first black, the second white, the third black, etc, etc... my approach is like a basic exercise of programming to calculate if a number is odd number or not: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; cell = ((MainCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]); if (cell==nil) { NSArray *topLevelObjects=[[NSBundle mainBundle] loadNibNamed:@"MainCell" owner:self options:nil]; for (id currentObject in topLevelObjects){ if ([currentObject isKindOfClass:[UITableViewCell class]]){ if ((indexPath.row % 2)==0) { [cell.contentView setBackgroundColor:[UIColor purpleColor]]; }else{ [cell.contentView setBackgroundColor:[UIColor whiteColor]]; } cell = (MainCell *) currentObject; break; } } }else { AsyncImageView* oldImage = (AsyncImageView*) [cell.contentView viewWithTag:999]; [oldImage removeFromSuperview]; }return cell; The problem is that when i do a rapid scroll, the background of cells become like the last 2 cell black, the first 2 cell white or something like this, but if i scroll slow works fine. I think the problem is the cache of reusableCell. Any ideas? TIA

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• NSXMLParser with multiple attributes

  - by mitb67

  Hi. I have the following XML (doing an app for iPhone): <Row> <Field name="employee_id_disp">00070431</Field> <Field name="given_name">John</Field> <Field name="family_name">Doe</Field> </Row> ... How can I retrieve values only for one of the attributes, for example value "John" for attribute name="given_name" ? Thanks for answers.

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• How can I remove the present view when I have added more than one subView ?

  - by srikanth rongali

  How can I remove the present view when I touched the close button. I did [self.view removeFromSuperView] when I added only one subView. It worked. But, I have now added another subView to the previous subView. I need to to get the parent view . How can I do it. My code of adding the subView is here. When I did the following only one view is removed. //FirstViewController: UIViewController -(void)libraryFunction:(id)sender { LibraryController *libraryController = [[LibraryController alloc]init]; [self.view addSubview:libraryController.view]; } //LibraryController: UIViewController -(void)viewDidLoad{ RootViewController *rootViewController = [[RootViewController alloc] initWithStyle:UITableViewStylePlain]; UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController]; self.navController = aNavigationController; [aNavigationController release]; [rootViewController release]; [self.view addSubview:navController.view]; } //RootViewController: UITableViewController - (void)viewDidLoad { [super viewDidLoad]; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Close" style:UIBarButtonItemStyleBordered target:self action:@selector(close:)]; } -(void)close:(id)sender { [self.view removeFromSuperview]; } Thank You.

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• Error "Create a concrete instance!"

  - by dododedodonl

  Hey All, I've got another problem in the same code... I'm getting this error: *** initialization method -initWithFormat:locale:arguments: cannot be sent to an abstract object of class NSString_RegEx: Create a concrete instance! But I don't understand the error or what I should do...

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• When is 'drawRect' called?

  - by Egil

  I have some custom drawing code in drawRect which also performs some calculation of sizes. When is the earliest I can be sure that this code has been loaded, e.g. if I want to modify it's containers size accordingly?

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• Create NSString from strings within a dictionary

  - by David Reynolds

  I have an NSDictionary where both the keys and values are NSStrings and I'd like to create one NSString from them in the form of Key1: Value1 Key2: Value2 What is the best method of doing this?

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• Is it possible to have other UIControls on a UITableView?

  - by Sheehan Alam

  I have a UITableView with 3 sections inside of a UIViewController. Is it possible to have other controls above the UITableView for example a UISlider or a UIImage? If so, how can this be accomplished? Note: These controls should not be in a UITableViewCell, they should be part of the view.

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• UIScrollView - with paging enabled, can I "change" the page width?

  - by Mike McMaster

  What's the simplest way to have a scroll view (with pagingEnabled set to YES) have a page width set to something other than the scroll view's bounds? Let me give an example. Suppose I have a scroll view with 10 items, each 150 pixels wide, and my scroll view is 300 pixels wide. If I start with views 1 and 2 visible and scroll horizontally to the right, I want the next "page" to show items 2 and 3. If I scroll one more page to the right, I would see items 3 and 4. Has anyone done this? If not, what strategy would you use?

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• Does the iPhone OS4 API do this? (bluetooth)

  - by alex

  get an array of bluetooth ID's Broadcast the bluetooth signal manually

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• Designing the iPhone interface in a nib or in code?

  - by Jacob Relkin

  I've been pondering over this question for a long time already. On the one hand, Interface Builder offers a really easy way to design the interface and wire the elements up with objects in code. On the other hand, in larger projects, Interface Builder becomes a hassle to maintain. Any suggestions would be greatly appreciated.

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• Retrieving Spotlight query used to open document in application

  - by vicvicvic

  If you search for something that opens Preview.app (e.g. a PDF file) in Spotlight, the application not only opens the file but actually copies the Spotlight query into the application's search field (for deeper search). iPhoto and Mail.app also do this. This is a really nice feature. Unfortunately, Apple does not document how it's implemented. Opening a document from Spotlight appears to simply send application:openFile to the application delegate. Is it possible to retrieve the user's Spotlight query somehow? Or is this a hardcoded feature of Spotlight?

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• What's the proper way to use sqlite on the iPhone?

  - by Elliot Chen

  Hi, Experts: Can you please give some suggestions on sqlite using on the iPhone? Within my application, I use a sqlite DB to store all local data. Two methods can be used to retrieve those data during running time. 1, Load all the data into memory at initialization stage. (More memory used, less DB open/close operation needed) 2, Read corresponding records when necessary, free the occupied memory after using. (Good habit for memory using, but much DB open/close operations needs). I prefer to use method 2, but not sure whether too many DB opening/closing operations could affect app's efficiency. Or do you think I can 'upgrade' method 2 by opening DB when app launches and closing DB when app quits? Thanks for your suggestions very much!

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