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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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• 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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• Using Mapping Models to migrate between Core Data Object Models

  - by westsider

  I have a fairly simply scheme. Essentially, Run <-- Data (where a Run holds a data, e.g., Temperature, sampled from some sort of sensor). Now, it seems that sensors can have more than one measurement (e.g., Temperature and Humidity). So, a single Run could have multiple data samples. Hence, Run <-- Sample and Sample <-- Data. (And for simplicity I am leaving Run <-- Data in place, for now.) If I create a new mapping model, then things generally work - except that no new Samples are created, no relationships are established between Runs and Samples nor between Samples and Datas. I am trying to get mapping model to migrate my model but even the slightest change to the generated mapping model results in Cocoa error 134110. For example, if I take the "Sample" mapping (which has no Source) and set its Source to 'Run' (so that I can set Sample's inverse relationship 'run' appropriately) then the mapping changes its name to "RunToSample". There are two relationships handled in this mapping: data and run. The data property gets set automatically to FUNCTION($manager, "destinationInstancesForEntityMappingNamed:sourceInstances:" , "DataToData", $source.dataSet) Following this example, I set the run property to FUNCTION($manager, "destinationInstancesForEntityMappingNamed:sourceInstances:" , "RunToRun", $source) Similarly, I set the 'sample' property mapping in RunToRun to FUNCTION($manager, "destinationInstancesForEntityMappingNamed:sourceInstances:" , "RunToSample", $source) and the 'sample' property in DataToData to FUNCTION($manager, "destinationInstancesForEntityMappingNamed:sourceInstances:" , "RunToSample", $source.run) So, what, I wonder, is going wrong? I have tried various permutations, such as leaving the 'inverse' relationships unspecified. But I continue to get the same error (134110) regardless. I imagine that this is a lot easier than it seems and that I am missing some fundamental but minor piece. I have also tried subclassing NSEntityMigrationPolicy and overriding -createDestinationInstancesForSourceInstance: but these efforts have met with much the same results. Thanks in advance for any pointers or (relevant :-) advice.

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• How do I force one method to be executed before another method?

  - by RexOnRoids

  I've got 2 methods. One method starts playing an audio file (.mp3), the other method updates a UIToolBar to show a button (PLAY or PAUSE). These two methods are called in the following order: //Adds some UIBarButtonItems to a UIToolBar [self togglePlayer]; //Uses AVAudioPlayer [audioPlayer play]; I call the methods in the above order so that the (pause) button will be shown at the time the song starts playing. But, the problem is that the song starts playing first, and the UIToolBar remains unchanged for quite a while (from 2 to 5 secs) until the button is added and shown. What I want is for the button to be shown at the same time the song starts playing (i.e. NO DELAY). Is there any way to do this?

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• shouldAutorotateToInterfaceOrientation isn't getting called

  - by morgancodes

  What sort of conditions might prevent my UIViewController's shouldAutorotateToInterfaceOrientation method from being called? I've resorted to using NSNotificationCenter to listen for UIDeviceOrientationDidChangeNotification events, but would love to get the autoRotation behavior working properly. A couple shots in the dark about what's going wrong: Maybe I'm not creating my view controller correctly? Maybe it needs to be inserted in the responder chain and somthething I'm doing is preventing that from happening normally? This seems unlikely to me since my view controller is recieving touch events. Maybe the fact that the view contained by my controller relies on OpenGL has something to do with shouldAutorotateToInterfaceOrientation not getting called? Do either of these sound remotely possible as being responsible? Any other ideas of things to look at?

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• Why can I not receive touch events within my custom UIScrollView subclass?

  - by stefanosn

  i have an uiscrollview with a uiimageview inside. I subclass the uiscrollview but i can not get touches to work touchbegin does not called. What should i do to call uitouch event? what is wrong? .h #import <UIKit/UIKit.h> @interface myScrollView : UIScrollView { } @end .m #import "myScrollView.h" @implementation myScrollView - (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[event allTouches] anyObject]; CGPoint location = [touch locationInView:touch.view]; if (touch.view.tag > 0) { touch.view.center = location; } NSLog(@"tag=%@", [NSString stringWithFormat:@"%i", touch.view.tag]); }

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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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• Setting an delegate for the UIDatePicker animation?

  - by james.ingham

  If I had a date picker within an action sheet and called the following line: [datePicker setDate:newDate animated:YES]; And then my app hides the action sheet the date picker is within, is there anyway to set up a animation delegate so that the user see's the animation of the date picker first and then hides the action sheet? I have done this with UIView's by calling: [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(METHOD)]; However I can not see anything like this for the date picker. Thanks in advanced - James

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• TableView SwipeGesture

  - by venkat

  hi every one.i am using TableView having edit button to delete a row.when i swipe in the row it shows a default "Delete" button. But i dont need it.The Content of the cell must be deleted by means of edit button not by default one.how to disable that "Swipe to Delete" Button.

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• Instruments freezes and restarts iPod touch 2g

  - by Eande

  I can't get my application running with instruments. I tried running through xcode with run-start with performance tool, instruments starts, iPod gets stuck and restarts everytime. It is really annoying. I am on 10.6.2, xcode 3.2.2 and using 3.2.1 SDK. Need help!

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• Rotation of a single UIViewController in a UITabBarController

  - by burki

  Hi! I have a UITabBarController with four UINavigationControllers. Well, I want to enable the rotation just for one of the four UIViewControllers. According to Apple's doc you shouldn't subclass UITabBarController, so I don't wanna do that. All UIViewControllers should support the same orientations that it works, but that's not what I want. How can the single UIViewController, which should support the rotation, detect that the device has changed its orientation? Because unless all the UIViewControllers added to the UITabBarControllers support the same orientation, the methods of the UIViewController for managing the rotation aren't called. I've been searching now for a while, but I haven't already found a pleasant answer. I guess a lot of developers wonder how to manage that. I already thank you for your answer.

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• UISearchBarBackground Class

  - by Jim Bonner

  I am using the following piece of code to hide the background on a UISearchBar: [[searchView.subviews objectAtIndex:0] setHidden:YES]; Pretty simple, but I worry about hard coding a position in a subview list. So I went looking for the UISearchBarBackground.h file and cannot find it. Does any know where the definition is hiding?

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• Grid View as demoed in iPad

  - by Sean Clark Hess

  I'm trying to develop a grid-like application for the iPad. Has anyone seen a control that displays info in a grid? In the demos they use a grid-like layout in both the iBooks store and the pictures application. Specifically in pictures, they are displaying a dynamic list of data in a grid. I can work around it, of course, but I'd rather use a control if one exists. Thanks!

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• Adding C++ Object to Objective-C Class

  - by Winder

  I'm trying to mix C++ and Objective-C, I've made it most of the way but would like to have a single interface class between the Objective-C and C++ code. Therefore I would like to have a persistent C++ object in the ViewController interface. This fails by forbidding the declaration of 'myCppFile' with no type: #import <UIKit/UIKit.h> #import "GLView.h" #import "myCppFile.h" @interface GLViewController : UIViewController <GLViewDelegate> { myCppFile cppobject; } @end However this works just fine in the .mm implementation file (It doesn't work because I want cppobject to persist between calls) #import "myCppFile.h" @implementation GLViewController - (void)drawView:(UIView *)theView { myCppFile cppobject; cppobject.draw(); }

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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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• How can I tell when a UIWebView has finished drawing to a context?

  - by phopkins

  In my code I'm trying to show a UIWebView as a page is loading, and then, when it's done, capture an image from the web view to cache and display later (so I don't have to reload and render the web page). I have something along the lines of: CGContextRef context = CGBitmapContextCreate(…); [[webView layer] renderInContext:context]; CGImageRef imageRef = CGBitmapContextCreateImage(context); UIImage *image = [UIImage imageWithCGImage:imageRef]; The problem I'm running into is that, due to UIWebView's tiling, sometimes only half of the page is rendered to the context by the time I capture the image. Is there a way to detect or block on UIWebView's background rendering thread so that I can get the image only after all of the rendering has finished?

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• How to get UIImage from EAGLView?

  - by RexOnRoids

  I am trying to get a UIImage from what is displayed in my EAGLView. Any suggestions on how to do this?

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• Is there any online .plist editor?

  - by luvieere

  I'm interested in an online application like the tool that comes with XCode, that shows the keys and values as rows, in an editable manner and handles xml plists (I don't care if it hadles binary ones as well).

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• How to have two UIPickerViews together in one ViewController?

  - by 0SX

  I'm trying to put 2 UIPickerViews together in one ViewController. Each UIPickerView has different data arrays. I'm using interface builder to link the pickers up. I know I'll have to use separate delegates and dataSources but I can't seem to hook everything up with interface builder correctly. Here's all my code: pickerTesting.h #import <UIKit/UIKit.h> #import "picker2DataSource.h" @interface pickerTestingViewController : UIViewController <UIPickerViewDelegate, UIPickerViewDataSource>{ IBOutlet UIPickerView *picker; IBOutlet UIPickerView *picker2; NSMutableArray *pickerViewArray; } @property (nonatomic, retain) IBOutlet UIPickerView *picker; @property (nonatomic, retain) IBOutlet UIPickerView *picker2; @property (nonatomic, retain) NSMutableArray *pickerViewArray; @end pickerTesting.m #import "pickerTestingViewController.h" @implementation pickerTestingViewController @synthesize picker, picker2, pickerViewArray; - (void)viewDidLoad { [super viewDidLoad]; pickerViewArray = [[NSMutableArray alloc] init]; [pickerViewArray addObject:@" 100 "]; [pickerViewArray addObject:@" 200 "]; [pickerViewArray addObject:@" 400 "]; [pickerViewArray addObject:@" 600 "]; [pickerViewArray addObject:@" 1000 "]; [picker selectRow:1 inComponent:0 animated:NO]; picker2.delegate = self; picker2.dataSource = self; } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)picker; { return 1; } - (void)pickerView:(UIPickerView *)picker didSelectRow:(NSInteger)row inComponent:(NSInteger)component { } - (NSInteger)pickerView:(UIPickerView *)picker numberOfRowsInComponent:(NSInteger)component; { return [pickerViewArray count]; } - (NSString *)pickerView:(UIPickerView *)picker titleForRow:(NSInteger)row forComponent:(NSInteger)component; { return [pickerViewArray objectAtIndex:row]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [super dealloc]; } @end And I have a separate class for the other datasource. picker2DataSource.h @interface picker2DataSource : NSObject <UIPickerViewDataSource, UIPickerViewDelegate> { NSMutableArray *customPickerArray; } @property (nonatomic, retain) NSMutableArray *customPickerArray; @end picker2DataSource.m #import "picker2DataSource.h" @implementation picker2DataSource @synthesize customPickerArray; - (id)init { // use predetermined frame size self = [super init]; if (self) { customPickerArray = [[NSMutableArray alloc] init]; [customPickerArray addObject:@" a "]; [customPickerArray addObject:@" b "]; [customPickerArray addObject:@" c "]; [customPickerArray addObject:@" d "]; [customPickerArray addObject:@" e "]; } return self; } - (void)dealloc { [customPickerArray release]; [super dealloc]; } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)picker2; { return 1; } - (void)pickerView:(UIPickerView *)picker2 didSelectRow:(NSInteger)row inComponent:(NSInteger)component { } - (NSInteger)pickerView:(UIPickerView *)picker2 numberOfRowsInComponent:(NSInteger)component; { return [customPickerArray count]; } - (NSString *)pickerView:(UIPickerView *)picker2 titleForRow:(NSInteger)row forComponent:(NSInteger)component; { return [customPickerArray objectAtIndex:row]; } @end Any help or code examples would be great. Thanks.

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• Autoresizing subclassed UITableViewCell subviews

  - by JustinXXVII

  I've subclassed UITableViewCell and incorporated some subviews via the layoutSubviews method. All views are allocated and initiated in the initWithStyle method, and frames are set in the layoutSubviews method, like so: initWithStyle:... { UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectZero]; myLabel.someProperties = Configured; [self.contentView addSubview:myLabel]; layoutSubviews { CGRect labelRect = CGRectMake(10.0f, 5.0f, 35.0f, 180.0f); myLabel.frame = labelRect; Setting the shouldAutoRotateOrientation to YES in the viewController rotates the NavigationController, tableView and UIToolbar appropriately, but the contents of the tableViewCells don't move. I'm not clear on where or what to add as far as AutoResizingMasks. The combinations I've tried so far haven't done anything. Can someone give me a hand? Thanks!

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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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• How to scroll programmetically to selected cover in coverflow view ?

  - by hib

  Hi all , I am using a coverflow component for my application . It is working nicely till now . But now I want to scroll to selected cover in coverflow . I am currently doing this : TKCoverView *cover = [self.coverflow coverAtIndex:currentIndex]; CGRect frame = cover.frame ; frame.origin.x = frame.origin.x * 1.2; // **main setting** [self.coverflow bringCoverAtIndexToFront:currentIndex animated:YES]; [self.coverflow scrollRectToVisible:frame animated:YES]; and the cover At index method - (TKCoverView*) coverflowView:(TKCoverflowView*)coverflowView coverAtIndex:(int)index{ TKCoverView *cover = [coverflowView dequeueReusableCoverView]; NSLog(@"Index value :%i",index); if(cover == nil){ cover = [[[TKCoverView alloc] initWithFrame:CGRectMake(0, 0, 224, 300)] autorelease]; // 224 cover.baseline = 224; cover.image = [UIImage imageNamed:@"Placeholder_2.png"]; cover.tag = index; }else { cover.image = ((object *)[array objectAtIndex:index]).appIconNormal; } return cover; and - (TKCoverView*) dequeueReusableCoverView{ if(yard == nil || [yard count] < 1) return nil; TKCoverView *v = [[[yard lastObject] retain] autorelease]; v.layer.transform = CATransform3DIdentity; [yard removeLastObject]; return v; } So can any one tell me what is the perfect and standard way of setting the frame for the scrollRectToVisibleRegion method .

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• Setting corelocation results to NSNumber object parameters

  - by Dan Ray

  This is a weird one, y'all. - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { CLLocationCoordinate2D coordinate = newLocation.coordinate; self.mark.longitude = [NSNumber numberWithDouble:coordinate.longitude]; self.mark.latitude = [NSNumber numberWithDouble:coordinate.latitude]; NSLog(@"Got %f %f, set %f %f", coordinate.latitude, coordinate.longitude, self.mark.latitude, self.mark.longitude); [manager stopUpdatingLocation]; manager.delegate = nil; if (self.waitingForLocation) { [self completeUpload]; } } The latitude and longitude in that "mark" object are synthesized parameters referring to NSNumber iVars. In the simulator, my NSLog output for that line in the middle there reads: 2010-05-28 15:08:46.938 EverWondr[8375:207] Got 37.331689 -122.030731, set 0.000000 -44213283338325225829852024986561881455984640.000000 That's a WHOLE lot further East than 1 Infinite Loop! The numbers are different on the device, but similar--lat is still zero and long is a very unlikely high negative number. Elsewhere in the controller I'm accepting a button press and uploading a file (an image I just took with the camera) with its geocoding info associated, and I need that self.waitingForLocation to inform the CLLocationManager delegate that I already hit that button and once its done its deal, it should go ahead and fire off the upload. Thing is, up in the button-click-receiving method, I test see if CL is finished by testing self.mark.latitude, which seems to be getting set zero...

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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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• UIView or UIViewController for custom View

  - by Daniel A. White

  What is the best way to create a custom UIView that I can consume in Interface Builder? Create a custom UIView in Interface Builder and inherit from UIView in a code file, then somehow use it in another UIView ala like a control. (How do I do this?) Create a custom UIView in Interface Builder and have a custom UIViewController wire it up. In my main ViewController, place the new view. Basically, I am trying to create a reusable display view and would like a quick way to change it across all my instances with minimal effort.

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