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• viewDidAppear called when popping navigationController

  - by Tiago

  I'm having a bit of a problem with the viewDidAppear: method. I have a tabBarController with navigationControllers on each tab, and I have an action that requires that all the navigation controllers pop to their rootViewControllers (programmatically). The problem is that when they pop each navigation controller, the rootViewController's viewDidAppear get's called without it actually being shown. This causes them to do some stuff they were not supposed to (like showing alerts) unless they are actually shown. Besides having to check the currently selected tabBar item, is there any other way to solve this? Thanks.

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• UISwitch within UIScrollview nearly impossible to use....

  - by samsam

  Hi there. I'm using a UISwitch-Component at the bottom of a view that sits within a UIScrollView. Now the problem that appeared, is that the switch is nearly impossible to swipe because the UIScrollView seems to dominate the userinput. Switching works very well by tapping the switch, but from my point of view, most users "switch" the UISwitch instead of tapping. Did anyone of you face the same / or similar problems and managed to come up with a solution? thx in advance sam

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• viewControllers is empty array

  - by Antonio

  Hi: I'm having a problem using the UITabBarController and can't seem to get anywhere... maybe someone has run into something similar. I have the typical Tab Bar + Navigation app and everything is working great, except when I access options in the More tab. On any other tab, if I log: NSLog(@"%@ \n %@",self.selectedViewController,[self.selectedViewController viewControllers]); I get, for example: 2010-05-29 00:05:13.512 MD[9950:207] <UINavigationController: 0x4c35ad0> ( <MDViewController: 0x4c35910>, <Detalle: 0x9050e80> ) If I access an element in the More tab, I get: 2010-05-29 00:05:13.512 MD[9950:207] <UINavigationController: 0x4c35ad0> ( ) An empty viewControllers array? Am I missing something? Thanks! Antonio

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• Get Lat, Long from CLLocation

  - by Marco

  Hello i have an CLLocation which is my userLocation, now in another class i have to open the maps app and make a route from the userLocation to another point. But how can i get in the another class the Coordinates of userLocation? please help me i have no idea

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• how to customize navigationbar color of MFMailComposeViewController?

  - by RAGOpoR

  from this code will show in original color how can i change it to another color? maybe it need to be override? MFMailComposeViewController *mail = [[MFMailComposeViewController alloc] init]; mail.mailComposeDelegate = self; if ([MFMailComposeViewController canSendMail]) { [mail setToRecipients:[NSArray arrayWithObjects:@"[email protected]",nil]]; [mail setSubject:@"support"]; [mail setMessageBody:@"enter your message here" isHTML:NO]; [self presentModalViewController:mail animated:YES]; }

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• JQTouch transition problem

  - by sukk1e

  I have a problem with the jqtouch bottom toolbar. Its a stationary bottom toolbar that is implemented with the iScroll plugin for jqtouch. When I want to switch between a page with a "right" slide transition effect I want to exclude the bottombar from also using the transition effect. The reason for this is because it looks weird when the bottom toolbar slides to the right.

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• UITextView - text shifts out of view when editing

  - by Jeff

  I have a tableHeaderView with a UITextView in it. The view loads from a nib. The UITextView does not have any scrolling turned on. The reason I am using it is simply that it wraps text over two lines. I gave it just enough room to fit two lines of text. The data that I prepopulate works just fine, and is aligned in the center vertically whether it is two or one line. The problem is that when I edit the cell via the UI, the text shifts up to the point that the top half of it is cut off. When exiting editing, it stays this way. Not sure I have any relevant code to show, but hopefully the explanation makes sense. I can't seem to find anyone else having this issue and I cannot imagine what it could be. I've played around with turning scrolling on and off, toying with the size of the field, and everything else I could play with to no avail. Thanks Jeff

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• UILabel over a UIToolBar

  - by paul simmons

  Hi, I have put a UILabel over a UIToolbar. It works fine (changing colors & text) but when I click something on the toolbar, from that moment on, UILabel's text color is like 'faded'. I have tried bringing UILabel to front but that did not work. Any suggestions?.

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• how to set UISwitch pointer to access switch from one uiviewcontroller another uiviewcontroller

  - by Rkm

  System UIViewcontroller has button event.Tap on Button fire InfoTableviewController. InfoTableview has UISwitch . How to set NSMutableArray of UIswitch pointer for System UIViewcontroller to access switch . SystemUIviewcontroller button event - (IBAction) Info_Button_Clicked:(id) sender { // pushcontroller Info *info = [[Info alloc]initWithNibName:@"Info" bundle:[NSBundle mainBundle]]; [self.navigationController pushViewController:info animated:YES]; [info release]; } Here for Info TableviewController // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = nil; if ([indexPath section] == 0) { static NSString *kDisplayCell_ID = @"DisplayCellID"; cell = [self.tableView dequeueReusableCellWithIdentifier: kDisplayCell_ID]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier: kDisplayCell_ID] autorelease]; cell.selectionStyle = UITableViewCellSelectionStyleNone; } else { // the cell is being recycled, remove old embedded controls UIView *viewToRemove = nil; viewToRemove = [cell.contentView viewWithTag:1]; if (viewToRemove) [viewToRemove removeFromSuperview]; } cell.textLabel.text = [[self.Soundarray objectAtIndex: indexPath.row] valueForKey:@"labelKey"]; UIControl *control = [[self.Soundarray objectAtIndex: indexPath.row] valueForKey:@"viewKey"]; [cell.contentView addSubview:control]; return cell; } }

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• How to dynamically compose a bitmask?

  - by mystify

  Lets say I have to provide an value as bitmask. NSUInteger options = kFoo | kBar | kFooBar; and lets say that bitmask is really huge and may have 100 options. But which options I have, depends on a lot of situations. How could I dynamically compose such a bitmask? Is this valid? NSUInteger options; if (foo) { options = options | kFoo; } if (bar) { options = options | kBar; } if (fooBar) { options = options | kFooBar; } (despite the fact that this would probably crash when doing that | bitmask operator thing to "nothing".

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• How to change disclosure style when user enters in edit mode of a UITableView?

  - by R31n4ld0

  Hello, guys. I have a UITableView that in 'normal' mode, show a UITableViewCellAccessoryDisclosureIndicator meaning if the user taps the row, another list is showed, like HIG says: "Disclosure indicator. When this element is present, users know they can tap anywhere in the row to see the next level in the hierarchy or the choices associated with the list item. Use a disclosure indicator in a row when selecting the row results in the display of another list. Don’t use a disclosure indicator to reveal detailed information about the list item; instead, use a detail disclosure button for this purpose." When the user tap the edit button in the top bar of the UITableView, I think I have to change the disclosure because if the user tap it, a view for changing the information of the current row is showed (see the bold line above), again, like HIG says: "Detail disclosure button. Users tap this element to see detailed information about the list item. (Note that you can use this element in views other than table views, to reveal additional details about something; see “Detail Disclosure Buttons” for more information.) In a table view, use a detail disclosure button in a row to display details about the list item. Note that the detail disclosure button, unlike the disclosure indicator, can perform an action that is separate from the selection of the row. For example, in Phone Favorites, tapping the row initiates a call to the contact; tapping the detail disclosure button in the row reveals more information about the contact." Have I miss understood the HIG, or I really do have to change the disclosure style in edit mode of UITableView? If yes, how I can intercept the edit mode when the user taps the Edit button? Thanks in advance.

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• PLEASE HELP unknown error [UIWindow endDisablingInterfaceAutorotation] ?

  - by iAm

  I am receiving this error. I have no clue as to why it would be called, and google didn't really help, any suggestions? -[UIWindow endDisablingInterfaceAutorotation] called on <UIWindow: 0x4e0ec50; frame = (0 0; 320 480); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x4e0f9e0>> without matching -beginDisablingInterfaceAutorotation. Ignoring.

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• Debugging SIGABRT within NSManagedObjectContext -save:

  - by westsider

  From inside NSManagedObjectContext -save: I am getting this message: Assertion failed: (_Unwind_SjLj_Resume() can't return), function _Unwind_SjLj_Resume, file /SourceCache/libunwind/libunwind-24.1/src/Unwind-sjlj.c, line 326. Program received signal: “SIGABRT”. warning: Unable to read symbols for /Developer/Platforms/iPhoneOS.platform/DeviceSupport/4.2.1 (8C148)/Symbols/Developer/usr/lib/libXcodeDebuggerSupport.dylib (file not found). This happens when I delete an Experiment object with to-many with Run which has to-many with Sample which has to-one with Data. Experiment also has to-many with Page which has to-many with Display which has to-many to Run. I mention this to point out the cyclical nature of the graph. Here is a simplified graph of model: I had been using Delete Rules but have now switched to "No Action" delete rules in combination with -prepareForDeletion methods for all of these classes. This change made no difference. In both cases, the error message is the same. Interestingly, when I relaunch the app, all the objects that were marked for deletion have been deleted. Also, if an Experiment has no Run objects, then deletion works without incidence. For that matter, deleting a single Run from an Experiment also works. I am hoping that someone has seen something like this and can offer advice on what would cause this. Or, if someone has advice on how to get libXcodeDebuggerSupport.dylib for iOS 4.2.1, that might also be helpful. Update: I followed advice found here and was able to get Xcode to find libXcodeDebuggerSupport.dylib for iOS 4.2.1. But this did not help at all in diagnosing problem - which persists.

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• UINavigationController placement problem

  - by Chonch

  Hey, I'm having this problem and I can't seem to figure out why! I want to use a UINavigationController, but I don't want to use it through out the entire application. So, in the UIViewController I was to add it to, I define: UINavigationController *navigationController; and the @property, @synthesize and dealloc. In the viewDidLoad method, I add: navigationController = [[UINavigationController alloc] init]; navigationController.navigationBar.barStyle = UIBarStyleBlack; and when the relevant UIViewController is loaded, I add: [navigationController pushViewController:viewController animated:NO]; and make the old view disappear and the UINavigationController's view to appear. Everything works fine except that the navigation bar appears about 20pixels too low (dragging the entire view down and out of the screen). If I set the UINavigationController's view frame parameter manually to start at 0,0, it jumps there, but only after about a second, so that you can see the navigation bar starting at a certain location and only then jumping to another (and it is ugly!). I have done the exact same thing in the past and had no problem with it. Does anyone know what may cause this? Thanks,

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• Compile C# into objective-C

  - by Ali Shafai

  Now that monotouch is being banned, I was wondering if there is a way to translate C# (or some other modern language for that matter) into objective-C? I won't mind using apple's api as long as I don't have to declare my variables in 3-4 stages (ivar-property-synthesize-dealloc). All I want is a less wordy language to concentrate on my intent and not on the compiler syntax. unfortunately apple in its arrogance thinks objective-c is a "modern" language and if you are looking for an alternative (monotouch) it's because you are incapable of coding. also if you don't find programming in itunes; sorry, xcode enjoyable, it is not because there are better alternatives, it's because you are stupid. anyway back to my original question: can it be done?

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• AudioQueue ate my buffer (first 15 milliseconds of it)

  - by iter

  I am generating audio programmatically. I hear gaps of silence between my buffers. When I hook my phone to a scope, I see that the first few samples of each buffer are missing, and in their place is silence. The length of this silence varies from almost nothing to as much as 20 ms. My first thought is that my original callback function takes too much time. I replace it with the shortest one possible--it re-renqueues the same buffer over and over. I observe the same behavior. AudioQueueRef aq; AudioQueueBufferRef aq_buffer; AudioStreamBasicDescription asbd; void aq_callback (void *aqData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer) { OSStatus s = AudioQueueEnqueueBuffer(aq, aq_buffer, 0, NULL); } void aq_init(void) { OSStatus s; asbd.mSampleRate = AUDIO_SAMPLES_PER_S; asbd.mFormatID = kAudioFormatLinearPCM; asbd.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; asbd.mBytesPerPacket = 1; asbd.mFramesPerPacket = 1; asbd.mBytesPerFrame = 1; asbd.mChannelsPerFrame = 1; asbd.mBitsPerChannel = 8; asbd.mReserved = 0; int PPM_PACKETS_PER_SECOND = 50; // one buffer is as long as one PPM frame int BUFFER_SIZE_BYTES = asbd.mSampleRate/PPM_PACKETS_PER_SECOND*asbd.mBytesPerFrame; s = AudioQueueNewOutput(&asbd, aq_callback, NULL, CFRunLoopGetCurrent(), kCFRunLoopCommonModes, 0, &aq); s = AudioQueueAllocateBuffer(aq, BUFFER_SIZE_BYTES, &aq_buffer); // put samples in the buffer buffer_data(my_data, aq_buffer); s = AudioQueueStart(aq, NULL); s = AudioQueueEnqueueBuffer(aq, aq_buffer, 0, NULL); }

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• Apple push notifications and Emoji characters...

  - by Friendlydeveloper

  Hello, I recently found this very interesting article on APNS and Emoji characters: EASY APNS - Just for fun It contains a list with all supported Emojis. However, I couldn't get them to display in my push notifications. All I get is the code, not the image. For example, if I add \ue415 (a smiley) to my message, I never see the image, just the code. Any idea what I'm doing wrong? Thanks in advance.

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• When we should use pushScene and replaceScene in cocos2d ?

  - by srikanth rongali

  Hi, I cocos2d, I am using pushScene and replaceScene to move to next scene. But, I am confused which we should use? When I am using replaceScene in some places app is crashing and giving errors like -[UITextView length]: unrecognized selector sent to instance 0x842a750 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UITextView length]: unrecognized selector sent to instance 0x842a750' But, in my program I am not passing length to UITextView. My program is in this way In scene1 I have UITextView, and I am replacing this scene with scene2. Then -(id)buttonPressed:(id)sender { [description removeFromSuperview]; // It is the textView(description) CCScene *Scene = [CCScene node]; CCLayer *Layer = [scene2 node]; [Scene addChild:Layer]; [[CCDirector sharedDirector] setAnimationInterval:1.0/60]; [[CCDirector sharedDirector] replaceScene: Scene]; } But, when I am using pushScene in presence of replaceScene it is working good. Please clarify me which one should use in which cases ? Thank You

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• UITableViewCell Custom accessory - get the row of accessory

  - by Emil

  Hi. I have a pretty big issue. I am trying to create a favorite-button on every UITableViewCell in a UITableView. That works very good, and I currently have an action and selector performed when pressed. accessory = [UIButton buttonWithType:UIButtonTypeCustom]; [accessory setImage:[UIImage imageNamed:@"star.png"] forState:UIControlStateNormal]; accessory.frame = CGRectMake(0, 0, 15, 15); accessory.userInteractionEnabled = YES; [accessory addTarget:self action:@selector(didTapStar) forControlEvents:UIControlEventTouchUpInside]; cell.accessoryView = accessory; And selector: - (void) didTapStar { UITableViewCell *newCell = [tableView cellForRowAtIndexPath:???]; accessory = [UIButton buttonWithType:UIButtonTypeCustom]; [accessory setImage:[UIImage imageNamed:@"stared.png"] forState:UIControlStateNormal]; accessory.frame = CGRectMake(0, 0, 26, 26); accessory.userInteractionEnabled = YES; [accessory addTarget:self action:@selector(didTapStar) forControlEvents:UIControlEventTouchDown]; newCell.accessoryView = accessory; } Now, here's the problem: I want to know what row the accessory that was pressed belongs to. How can I do this? Thank you :)

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• AVAudioPlayer only initializes with some files

  - by Brendan

  Hi everyone, I'm having trouble playing some files with AVAudioPlayer. When I try to play a certain m4a, it works fine. It also works with an mp3 that I try. However it fails on one particular mp3 every time (15 Step, by Radiohead), regardless of the order in which I try to play them. The audio just does not play, though the view loading and everything that happens concurrently happens correctly. The code is below. I get the "Player loaded." log output on the other two songs, but not on 15 Step. I know the file path is correct (I have it log outputted earlier in the app, and it is correct). Any ideas? NSData *musicData = [NSData dataWithContentsOfURL:[[NSURL alloc] initFileURLWithPath:[[NSBundle mainBundle] pathForResource:[song filename] ofType:nil]]]; NSLog([[NSBundle mainBundle] pathForResource:[song filename] ofType:nil]); if(musicData) { NSLog(@"File found."); } self.songView.player = [[AVAudioPlayer alloc] initWithData:musicData error:nil]; if(self.songView.player) { NSLog(@"Player loaded."); } [self.songView.player play]; NSLog(@"You should be hearing something now."); Thanks, Brendan

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• How do I code a green button in UIActionSheet?

  - by Joshua

  I am using the code: { randomstatus=0; msg=[[NSString alloc]initWithFormat:@"Good job, do you want to continue?"]; UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:msg delegate:self cancelButtonTitle:@"No" destructiveButtonTitle:@"Yes" otherButtonTitles:nil]; [actionSheet showInView:self.view]; [actionSheet release]; [msg release]; } I don't want to change the code, but I need the "destructiveButton" to be green instead of red. Is this possible, or do i need to use a different button?

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• Issues dismissing keyboard conditionally

  - by Chris

  I have an app that has a username and password field. I want to validate the input before the the user is allowed to stop editing the field. To do that, I'm using the textFieldShouldEndEditing delegate method. If the input doesn't validate I display a UIAlertView. This approach works as advertised - the user cannot leave the field if the input doesn't validate. To have the done button on the keyboard dismiss the keyboard, I call resignFirstResponder on the textfield. The issue I have is the alert is being called twice. How do I keep the alert from showing twice? edit for clarification What is happening is that the alert appears, then another alert appears. I then have to dismiss both windows to fix the input. Here is the textFieldShouldEndEditing method -(BOOL)textFieldShouldEndEditing:(UITextField *)textField { NSLog(@"function called %@",textField); if([textField.text length] == 0) { return YES; } if(textField == userName) { if([self userNameValidated:textField.text]) { NSLog(@"name validated"); NSString *tempDonerName = [[NSString alloc] initWithString:(@"%@",userName.text)]; //[[NSUserDefaults standardUserDefaults] setObject:tempDonerName forKey:@"name"]; [tempDonerName release]; return YES; } else { NSLog(@"name did not validate"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Invalid Username",@"Invalid Username title") message:NSLocalizedString(@"Please make sure there are no apostrophes,spaces in the username, and that the username is less than 12 characters",@"Invalid username message") delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",@"OK Text") otherButtonTitles:nil]; [alert show]; [alert release]; return NO; } } else if (textField == userPin) { if([self userPinValidated:textField.text]) { NSLog(@"pin validated"); //NSString *tempDonerPin = [[NSString alloc] initWithString:(@"%@",userPin.text)]; //[[NSUserDefaults standardUserDefaults] setObject:tempDonerPin forKey:@"pin"]; //[tempDonerPin release]; return YES; } else { NSLog(@"pin did not validate"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Invalid Password",@"Invalid Pin title") message:NSLocalizedString(@"Please make sure there are no apostrophes in the password",@"Invalid password message") delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",@"OK Text") otherButtonTitles:nil]; [alert show]; [alert release]; return NO; } }else { NSLog(@"code validate - shouldn't get called"); return YES; } }

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• How can I extract a URL from a sentence that is in a NSString?

  - by 0SX

  What I'm trying to accomplish is as follows. I have a NSString with a sentence that has a URL within the sentience. I'm needing to be able to grab the URL that is presented within any sentence that is within a NSString so for example: Let's say I had this NSString NSString *someString = @"This is a sample of a http://abc.com/efg.php?EFAei687e3EsA sentence with a URL within it."; I need to be able to extract http://abc.com/efg.php?EFAei687e3EsA from within that NSString. This NSString isn't static and will be changing structure and the url will not necessarily be in the same spot of the sentence. I've tried to look into the three20 code but it makes no sense to me. How else can this be done? Thanks for help.

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• Automatically created NSManagedObject subclasses don't use ARC

  - by Jordan

  My project is ARC enabled (the build settings have Objective-C Reference Counting set to YES). There are no file exceptions to this, it is enabled project wide. (Latest stable version of Xcode). When I create an NSManagedObject subclass via File New for a Core Data entity, the generated header uses the following in its property declarations: @property (nonatomic, retain) But 'retain' is not ARC!! Is this a bug, or is there something I'm missing or not understanding? There are no build warnings - if this is a bug though, how can I remedy it?

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• How to display the image in the web view using html code?

  - by Madan Mohan

  Hi Guys, I am getting the data form Parser, In that I am getting a set of urls. Using these urls can I make image url by appending any data values getting from the parser. http://musicbrainz.org/ws/1/artist/f27ec8db-af05-4f36-916e-3d57f91ecf5e?type=xml&inc=url-rels+artist-rels using these url i get data and set of urls.They are not providing image url or thumbnail. So, Is it possible to get or form an image url from parser (http://musicbrainz.org/ws/1/artist/f27ec8db-af05-4f36-916e-3d57f91ecf5e?type=xml&inc=url-rels+artist-rels) and display in the web view. Please help me from this problem. Thank You, Madan Mohan.

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