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• Allowing user to select a UIPickerView row by tapping.

  - by camilo

  Hi. I'm trying to use a UIPicker View with a behavior somehow different of what's usually seen in iPhone code examples. What I want to do is to allow users to scroll through the picker contents, but not to select a picker's row automatically (using the "didSelectRow" method from picker's delegate). Instead, I want to allow the user to touch the center row of the picker, which gets highlighted, and becomes the selection. Is there any way to achieve this? Thanks in advance.

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• pass value through url

  - by shishir.bobby

  hi all, i hv a question. my url is some thing like this http://www.google.com?to=shishir&from=friend and i hv 2 textfeild from where i m getting value of to and from. i need to set those values of 2 textfeiilds into the URL to="values from textfeild" from="value from textfeild" to create a somewhat called a dynamic URL. how can i do it quick reply is always appreciated regards shishir

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• iPhone GPS Development - Tips + Tricks

  - by Keith Fitzgerald

  Hello - I'm looking for some feedback, blog links, etc that offer some tips and tricks for iPhone GPS development. I've read and understand the API, I have my demo app up and running, etc but I have run into some "quirks" with gps on iphone. For example, it seems that you you will receive a lot less location updates when your iphone enters "power save" mode. I've read that you can combat this by playing music in your application [not sure if this is true]. It also seems that, terms of making a reasonable pedometer, you should filter out any reading with horizontal accuracies less than 20 meters. Does this sound right? Is there any kind of checklist out on the web for iphone gps gotchas? Thanks in advance.

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• Testing MPMoviePlayerViewController in iPad simulator

  - by hgpc

  I have a view that shows a MPMoviePlayerViewController modally. When testing it in the iPad simulator it works well on the first try. If I dismiss the video and then show the view again, the player only plays the audio, but not the video. Is this a simulator quirk or am I doing something wrong? Here's my code: - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; MPMoviePlayerViewController* v = [[MPMoviePlayerViewController alloc] initWithContentURL:url]; [[NSNotificationCenter defaultCenter] addObserver:self selector: @selector(playbackDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:v.moviePlayer]; [self presentMoviePlayerViewControllerAnimated:v]; [v release]; } -(void) playbackDidFinish:(NSNotification*)aNotification { MPMoviePlayerController *player = [aNotification object]; [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:player]; [player stop]; [self dismissMoviePlayerViewControllerAnimated]; }

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• Nav Controller, UITableViewController, UITextField to become firstResponder?

  - by Daniel Granger

  I have a core data application which uses a navigation controller to drill down to a detail view and then if you edit one of the rows of data in the detail view you get taken to an Edit View for the that single line, like in Apples CoreDataBooks example! The edit view is a UITableviewController which creates its table with a single section single row and a UITextfield in the cell, programatically. What I want to happen is when you select a row to edit and the edit view is pushed onto the nav stack and the edit view is animated moving across the screen, I want the textfield to be selected as firstResponder so that the keyboard is already showing as the view moves across the screen to take position. Like in the Contacts app or in the CoreDataBooks App. I currently have the following code in my app which causes the view to load and then you see the keyboard appear (which isn't what I want, I want the keyboard to already be there) - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; [theTextField becomeFirstResponder]; } You can't put this in -viewWillAppear as the textfield hasn't been created yet so theTextField is nil. In the CoreDataBooks App where they achieve what i want they load there tableview from a nib so they use the same code but in -viewWillAppear as the textfield has already been created! Is there anyway of getting around this without creating a nib, I want to keep the implementation programatic to enable greater flexibility. Many Thanks

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• Save options selected in AlertDialog spawned from ItemizedOverlay onTap method

  - by ahsteele

  In the description of how to add a list of options to an AlertDialog the official Android documentation alludes to saving a users preferences with one of the "data storage techniques." The examples assume the AlertDialog has been spawned within an Activity class. In my case I've created a class that extends ItemizedOverlay. This class overrides the onTap method and uses an AlertDialog to prompt the user to make a multi-choice selection. I would like to capture and persist the selections for each OverlayItem they tap on. That said I am unsure if utilizing an AlertDialog in this manner is the right approach and open to other suggestions. protected boolean onTap(int index) { OverlayItem item = _overlays.get(index); final CharSequence[] items = { "WiFi", "BlueTooth" }; final boolean[] checked = { false, false }; AlertDialog.Builder builder = new AlertDialog.Builder(_context); builder.setTitle(item.getTitle()); builder.setMultiChoiceItems(items, checked, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int item, boolean isChecked) { // for now just show that the user touched an option Toast.makeText(_context, items[item], Toast.LENGTH_SHORT).show(); } }); builder.setPositiveButton("Okay", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { // should I be examining what was checked here? dialog.dismiss(); } }); builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alert = builder.create(); alert.show(); return true; }

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• View controller is drawing under my navigation bar after popping ttthumbsviewcontroller

  - by scootklein

  I'm implementing the TTThumbsViewController from the Three20 project and things are finally starting to take shape. I push the TTThumbsViewController from the current view controller by just pushing it onto the current stack and animate the transition (common navigation controller push). My problem is that when I pop the TThumbsViewController view controller, the navigation controller is stuck in a mode where its view controllers are drawn UNDER the navigation bar (which is now translucent). Start Push Pop

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• Why doesn't genstrings convert NSLocalizedStringFromTable entries to table.strings?

  - by juan tendero

  In my source code I have some lines like NSLocalizedStringFromTable(@"Info", @"en", @"Title of this view"). When I subsequently call genstrings -o en.lproj ./Classes/*.m I would not get the expected file en.strings but Localized.strings, although I've read in the genstrings-manpage that it would generate a table.strings file from NSLocalizedStringFromTable(a, table, c) function. Am I wrong? How would I create a table.strings file then?

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• Using kAudioSessionProperty_OtherMixableAudioShouldDuck on iPhone

  - by Cliff

  Hello, I'm trying to get consistant behavior out of the kAudioSessionProperty_OtherMixableAudioShouldDuck property on the iPhone to allow iPod music blending and I'm having trouble. At the start of my app I set an Ambient category like so: -(void) initialize { [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryAmbient error: nil]; } Later on when I attempt to play audio I set the duck property using the following method: //this will crossfade the audio with the ipod music - (void) toggleCrossfadeOn:(UInt32)onOff { //crossfade the ipod music AudioSessionSetProperty(kAudioSessionProperty_OtherMixableAudioShouldDuck,sizeof(onOff),&onOff); AudioSessionSetActive(onOff); } I call this passing a numeric "1" just before playing audio like so: [self toggleCrossfadeOn:1]; [player play]; I then call the crossfade method again passing a zero when my app's audio completes using a playback is stopping callback like so: -(void) playbackIsStoppingForPlayer:(MQAudioPlayer*)audioPlayer { NSLog(@"Releasing player"); [audioPlayer release]; [self toggleCrossfadeOn:0]; } In my production app this exact code works as expected, causing the ipod to fade out just before playing my app's audio then fade back in when the audio finishes playing. In a new project I recently started, I get different behavior. The iPod audio fades down and never fades back in. In my production app I use the AVAudioPlayer where in my new app I've written a custom audio player that uses audio queues. Could somebody help me understand the differences and how to properly use this API?

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• When should you NOT use the asterisk (*) when declaring a variable in Objective C

  - by Jason

  I have just started learning objective c and the asterisk is giving me some trouble. As I look through sample code, sometime it is used when declaring a variable and sometimes it is not. What are the "rules" for when it should be used. I thought it had something to do with the data type of the variable. (asterisk needed for object data types, not needed for simple data types like int) However, I have seen object data types such as CGPoint declared without the asterisk as well? Is there a definitive answer or does it have to do with how and what you use the variable for?

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• Objective C: Create arrays from first array based on value

  - by Nic Hubbard

  I have an array of strings that are comma separated such as: Steve Jobs,12,CA Fake Name,21,CA Test Name,22,CA Bill Gates,44,WA Bill Nye,21,OR I have those values in an NSScanner object so that I can loop through the values and get each comma seperated value using objectAtIndex. So, what I would like to do, is group the array items into new arrays, based on a value, in this case, State. So, from those, I need to loop through, checking which state they are in, and push those into a new array, one array per state. CA Array: Steve Jobs,12,CA Fake Name,21,CA Test Name,22,CA WA Array: Bill Gates,44,WA OR Array: Bill Nye,21,OR So in the end, I would have 3 new arrays, one for each state. Also, if there were additional states used in the first array, those should have new arrays created also. Any help would be appreciated!

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• How should I load a xib into a detail view for a split view iPad objective app?

  - by editor

  I've got a split view iPad app with table view in the master pane. After drilling down several levels, each time loading a new .xib, I'd like one of the cells to trigger a web page load in the detail pane. Right now I can only get the web page .xib to load in the master pane side -- which is a master pain in my side. The basic load call where "URLWindow" is a class loaded with initWithNibName: [[self navigationController] pushViewController:URLWindow animated:YES]; I want to do this, but it doesn't seem to work: @interface @property (nonatomic, retain) IBOutlet DetailViewController *detailViewController; ... @implementation [[self detailViewController] pushViewController:URLWindow animated:YES]; How should I be loading the URLWindow .xib into a detail view for a split view detail pane?

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• Table image not showing, "Pop an autorelease pool" error

  - by Graeme

  hi, I have a UITableView which uses the following code to display an image in a Table View cell: cell.imageView.layer.masksToBounds = YES; cell.imageView.layer.cornerRadius = 5.0; UIImage *image = [UIImage imageNamed:[[color types] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]]; if ( image ) { cell.imageView.image = [image imageScaledToSize:CGSizeMake(50, 50)]; } It works fine on the iPhone simulator, but when I try it on a real iPhone the iPhone doesn't show. Instead in the console in debugging mode, I get this error: attempt to pop an unknown autorelease pool (0x851e00) Any help would be great, thanks.

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• UIRotationGestureRecognizer minimum rotation value

  - by dc

  Is it possible to set a minimum rotation value necessary for a UIRotationGestureRecognizer to transition into UIGestureRecognizerStateRecognized? I'm using multiple recognizers, and my UIRotationGestureRecognizer keeps getting called with a very small rotation (Between 1 and 15 degrees either direction) rather than my UIPinchGestureRecognizer. What I'd like to do is only have the rotation be called if the rotation is within a certain range, otherwise cancel it and let the pinch be called.

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• iPhone: Group by month - Core Data

  - by Shaun

  Hi I store dates in a core data entity attribute, I then display the date in the table cells. I want to group all the cells according to months and only display the relevant dates in the correct sections. I'm using sectionNameKeyPath of the NSFetchedResultsController, but I need to only use the month in the date to group. How can I achieve this? Would I need to create a new attribute and store just the month as a string or can I use NSPredicate? Please can anyone let me know if they have done this or give me some examples. Thanks

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• Delay in playing a beep sound

  - by iSharreth

  -(IBAction)playSound{ AVAudioPlayer *myExampleSound; NSString *myExamplePath = [[NSBundle mainBundle] pathForResource:@"myaudiofile" ofType:@"caf"]; myExampleSound =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:myExamplePath] error:NULL]; myExampleSound.delegate = self; [myExampleSound play]; } I want to play a beep sound when a button is clicked. I had used the above code. But it is taking some delay in playing the sound. Anyone please help.

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• how to make a explorer like logic in Obj C for iphone

  - by Ekra

  Hi friends, To make the query simple first we can take example:- If we open the explorer in our Windows desktop how it shows us the tree. As we keep on clicking the tree it get expanded and shows the file in it. The same way I want to show a explorer which gets expanded as the user clicks on it(I want to get the business logic the UI is simple). The information of the explorer i.e. which folder has what files come in a XML format to me. I have 2 options of getting the XML either I can get the whole XML at one query(but I guess this might slow the application if the XML is quite big). OR I can get the XML for every list like first only the root structure then if user clicks on any folder in root I can get the list(the files or folders inside that folder) of that particular folder. Now the question is What would be the approach to implement both the method and which would be the best. Should I need to create some dictionary to maintain the link of the files like which file is inside what. I am not able to get as how I would be able to link all the files. Any hint or direction would be highly appreciated. Thanks in advance

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• How to add a cell to a UITableView?

  - by Sheehan Alam

  I want to be able to add 1 cell to the top of a UITableView after the user clicks on a button. How can I achieve this?

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• Get Name by Cellphone number

  - by ganti

  Hy everyone I'm using a TextField where the user is typing in a phonenumber. When the TextField has changed it should check if this number is allready in the phonebook and display the name. So far, my only way is to parse all names and number in a Dict and read it from there. Is there a simpler more efficient and sophisticated way to do that. cheers simon

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• iPhone autorotation for too many objects on screen

  - by Denis

  Hi! I have a BlahAppDelegate, BlahViewController and no nibs in my iPhone app project. Only some subclasses of UIView in addition. All this is situated in main.m. My app has 6 subclassed UIViews. Each of it contains 18 UIImageViews. I need to get autorotating work. Or custom rotating. Or something. For example it would be nice to fade the screen out when device is rotated, then move/resize views and then fade screen out. But I don't know how to automate it, without writing a resizing code for each of objects. Please help me if you can.

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• NSOperation and UIKit problem

  - by Infinity

  Hello guys! I am doing my download with an object which was inherited from NSOperation. I have read the documentation and when my operation finished I must call the [self.delegate performSelectorOnMainThread:@selector(operationDidFinish:) withObject:self waitUntilDone:YES]; method. It needs to be called on the main thread, because the UIKit is not thread safe and the documentation says this in these non thread safe frameworks cases. In the delegate method I am drawing a pdf or an image, but because it is drawn on the main thread the User Interface is very laggy until the drawing is finished. Maybe can you suggest me a good way to avoid this problem?

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• Cannot run code on device

  - by lostInTransit

  Hi I have some source code which I had developed and later gave to another team. They signed it with their certificate and provisioning profile. Now I have the code back and have set the appropriate values in the project properties for code signing identity (with my cert and profile). But when I run the application on a device, I get an error showing the other team's certificate and prompting that the provisioning profile does not exist. I don't know where it is being referenced. Can someone please help. Thanks.

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• Scrollview animation in different ways?

  - by senthilmuthu

  Hi, If you see the URL in TRY ME simulator select cardex tab,if u scroll vertically on simulator(flash),the no of uiviews are coming,if u touch anything, it will be shown,any idea to do this ,have they used OPENGL? please any help?

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• UITableView resizing rows problem

  - by Vin

  Hi All, Hope to get solution to this problem. I have been stuck on it since a long time now. I have a a tableView which has custom labels drawn upon the cell using CGRect. I receive the data from a web service in arrays. Initially i display a line of data on the cells. When the user selects a cell, I call reloadsRowAtIndexPath to increase the height of selected row. In the process, cellForRowAtIndexPath gets called again. I keep track of this by a flag, and when cellForRowAtIndexPath gets called again, I display the two more lines of data from arrays, on the cell. What i am getting is all overlapping data on one other. I tried to remove already placed labels in didSelectRowAtIndexPath, but to no avail. Please help me on this Thanks in advance.

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• Newbie Android question

  - by DanyW

  Hi folks, I have just started with Android with the usual Hello World project template in Eclipse. I modified the layout XML and removed the label that says "Hello World, !", and added a couple of other controls. However, these are not reflected in the app, within the emulator. When I run this app from Eclipse again it is still showing the Hello World label! I'm sure it's something terribly simple that I have completely missed. Can someone please point me in the right direction? Many thanks, Dany.

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