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  • iPhone metering problems

    - by Eric Christensen
    When I'm recording an AVAudioRecorder object, I repeat a chunk of code via an NSTimer that includes: [soundrecording updateMeters]; NSLog(@"channel 0 average:%f, peak:%f",[soundrecording averagePowerForChannel:0],[soundrecording peakPowerForChannel:0]); NSLog(@"channel 1 average:%f, peak:%f",[soundrecording averagePowerForChannel:1],[soundrecording peakPowerForChannel:1]); When I'm recording a mono file, the peak power for channel 0 is just what you'd expect, a float from -160 to 0. But average power for channel 0 is always zero. (And, of course, the values for channel 1 are both zero.) When I'm recording a stereo file, both the average and peak values for both channels are as expected. Any thoughts on why, when recording a mono file, the average value for channel 0 isn't returning correctly, even though the peak is? Thanks!

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  • How to do iPad Photos app pinch to expand

    - by Macatomy
    I don't think this has been asked before on this site, but I might be wrong. Does anyone know the basics of how to get that whole effect with the iPad Photos app? Basically, pinching a stack of photos lets you have a "peek" at the photos in that stack, which expands based on the distance between your 2 fingers in the pinch, then fully completing the outwards pinch gesture opens the photos in the stack in a new view. See this video to get what I mean. I know of at least one third party app that uses the same method as the iPad Photo app, so I know it's possible to do. I'm guessing I would do something with UIPinchGestureRecognizer but I'm not sure exactly how to proceed.

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  • How to change a UIBarButtonItem in a UINavigationBar

    - by pkulak
    I'm trying to set up a list of items that can be edited. I have a main view, with a UINavigationBar at the top and a UITableView directly under it. I'd like to have my "edit" button change to a "done" button on click, but I can't figure out how to do it. If I could do it in the code (not it interface builder), I could just replace it, but I can't even do that. I've seen some code using [self.navigationItem], but in my case self is a UIView. It also feels a bit odd to be using a UINavigationBar when I don't want navigation (this is one page only), but I want a toolbar with a title and and a button, so I don't think really have a choice.

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  • Core Data + Core Animation/CALayer together??

    - by ivanTheTerrible
    I am making an Cocoa app with custom interfaces. So far I have implemented one version of the app using CALayer doing the rendering, which has been great given the hierarchical structure of CALayers, and its [hitTest:] function for handling mouse events. In this early version, the model of the app are my custom classes. However, as the program grows I feel the urge of using Core Data for the model, not just for the ease of binding/undo management, but also want to try out the new technology. My method so far: In Core Data: creating a Block entity, with attributes xPos, yPos, width, height...etc. Then, creating a BlockView : CALayer class for drawing, which uses methods such as self.position.x = [self valueForKey:@"xPos"] to fetch the values from the model. In this case, every BlockView object has to also keep a local copy of xPos, which is NOT good. Do any of you guys have better suggestions? Edit: This app is a information visualization tool. So the positions, dimensions of the blocks are important, and should be persisted for later analysis.

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  • CFNetwork / NSURLConnection leak

    - by JK
    Running instruments on the device, I intermittently incur a memory leak of exactly 3.5 KB in CFNetwork, the responsible frame being "HostLookup_Master::HostLookup...." I have read a number of questions re this issue and have separately tried the following to fix the leak: Included the following in applicationDidFinishLaunching: NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil]; [NSURLCache setSharedURLCache:sharedCache]; [sharedCache release]; Specified in the urlrequest not to load from the local cache. None of the above worked. My class that instantiates the connections does not leak as its instances are released when data has been downloaded. I have verified this by confirming the the living objects of the class is 0 using Instruments. Any advice on addressing this leak would be greatly appreciated.

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  • Prevent diagonal scrolling in UIScrollView?

    - by NickD
    How can I force a UIScrollView in which paging and scrolling are on to move vertically or horizontally only? My understanding is that the directionalLockEnabled property should achieve this, but a diagonal swipe still causes the view to scroll diagonally instead of restricting motion to a single axis. Edit: to be clearer, I'd like to allow the user to scroll horizontally OR vertically, but not both simultaneously.

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  • Printing an NSDocument

    - by Brian Postow
    I'm trying to print a document. The document is an array of NSImageReps, or a single NSPDFImageRep, which has multiple pages. I'm having trouble figuring out how to use the NSPrintOperation class to print this. The NSPrintOperation seems to need an NSView to print. Do I need to manually add each image into the view at a calculated position and then let it do the pagination? that seems like it isn't in the spirit of Cocoa... is there some technique that I'm missing?

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  • UITableView titleForHeaderInSection prints headers to console twice then crashes

    - by joec
    In the method below titleForHeaderInSection, for some reason the NSLog prints out the headers twice and then the app crashes in objc_msgSend. I can't understand why this would cause the app to crash? It would seem from research that crashes in objc_msgSend are caused by sending messages to already freed objects, but is that the case here? My sectionNames array is populated in viewDidLoad. - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { NSString *title = nil; title=[sectionNames objectAtIndex:section]; NSLog(title); return title; } Thanks

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  • How can I pass latitude and longitude values from UIViewController to MKMapView?

    - by jerincbus
    I have a detail view that includes three UIButtons, each of which pushes a different view on to the stack. One of the buttons is connected to a MKMapView. When that button is pushed I need to send the latitude and longitude variables from the detail view to the map view. I'm trying to add the string declaration in the IBAction: - (IBAction)goToMapView { MapViewController *mapController = [[MapViewController alloc] initWithNibName:@"MapViewController" bundle:nil]; mapController.mapAddress = self.address; mapController.mapTitle = self.Title; mapController.mapLat = self.lat; mapController.mapLng = self.lng; //Push the new view on the stack [[self navigationController] pushViewController:mapController animated:YES]; [mapController release]; //mapController = nil; } And on my MapViewController.h file I have: #import <UIKit/UIKit.h> #import <MapKit/MapKit.h> #import "DetailViewController.h" #import "CourseAnnotation.h" @class CourseAnnotation; @interface MapViewController : UIViewController <MKMapViewDelegate> { IBOutlet MKMapView *mapView; NSString *mapAddress; NSString *mapTitle; NSNumber *mapLat; NSNumber *mapLng; } @property (nonatomic, retain) IBOutlet MKMapView *mapView; @property (nonatomic, retain) NSString *mapAddress; @property (nonatomic, retain) NSString *mapTitle; @property (nonatomic, retain) NSNumber *mapLat; @property (nonatomic, retain) NSNumber *mapLng; @end And on the pertinent parts of the MapViewController.m file I have: @synthesize mapView, mapAddress, mapTitle, mapLat, mapLng; - (void)viewDidLoad { [super viewDidLoad]; [mapView setMapType:MKMapTypeStandard]; [mapView setZoomEnabled:YES]; [mapView setScrollEnabled:YES]; MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } }; region.center.latitude = mapLat; //40.105085; region.center.longitude = mapLng; //-83.005237; region.span.longitudeDelta = 0.01f; region.span.latitudeDelta = 0.01f; [mapView setRegion:region animated:YES]; [mapView setDelegate:self]; CourseAnnotation *ann = [[CourseAnnotation alloc] init]; ann.title = mapTitle; ann.subtitle = mapAddress; ann.coordinate = region.center; [mapView addAnnotation:ann]; } But I get this when I try to build: 'error: incompatible types in assignment' for both lat and lng variables. So my questions are am I going about passing the variables from one view to another the right way? And does the MKMapView accept latitude and longitude as a string or a number?

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  • SQLite - a smart way to remove and add new objects

    - by Ilya
    Hi, I have a table in my database and I want for each row in my table to have an unique id and to have the rows named sequently. For example: I have 10 rows, each has an id - starting from 0, ending at 9. When I remove a row from a table, lets say - row number 5, there occurs a "hole". And afterwards I add more data, but the "hole" is still there. It is important for me to know exact number of rows and to have at every row data in order to access my table arbitrarily. There is a way in sqlite to do it? Or do I have to manually manage removing and adding of data? Thank you in advance, Ilya.

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  • Unable to find CFNetwork in XCode

    - by Baishampayan Ghose
    Hello, I am trying to use CFNetwork in my app so I tried adding CFNetwork.framework from the Edit Target dialog in XCode. The interesting thing is that CFNetwork is not visible in the dialog box at all. Am I missing anything? Do I have to add/install CFNetwork in some other way? Screenshot - Thanks in advance.

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  • How to perform kCATransitionPush animation without any transparency / fade effects

    - by Anthony
    I'm trying to duplicate the "slide up from the bottom" animation that [UIViewController presentModalViewController:animated:] performs but without calling it because I don't want a modal view. The below core animation code comes very close but appears to be changing transparency values of the views during it. At the start of the animation you can partially see through the view sliding up. By the middle/end of the animation the view we are sliding over is fully transparent so we can see behind it. I'd like both to remain fully opaque during this animation. Any ideas on how to stop transparency changes in this code or to otherwise get the "slide up animation" I am looking for without requiring a modal view? UIViewController *nextViewController = [[UIViewController alloc] autorelease]; nextViewController.view.backgroundColor = [UIColor redColor]; CATransition *animation = [CATransition animation]; animation.duration = 3.5; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; animation.type = kCATransitionPush; animation.subtype = kCATransitionFromTop; [self.navigationController pushViewController:nextViewController animated:NO]; [self.navigationController.view.layer addAnimation:animation forKey:nil];

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  • GKTank example is not working.

    - by david
    Hello, I'm trying to get the GKTank example working with 2 iPhones. Both have bluetooth enabled. I start the app on both devices and tap the screen. The Peer Picker comes up and the devices find each other. If I select one device in the list it says "Waiting for {other iPhone}..." forever. On the {other iPhone} the waiting phone gets grayed out. If I select the device to connect to from both devices at the same time both go into waiting state forever... The debug log says this if I select the other iPhone on the debugged device: 2010-05-30 23:20:24.331 GKTank[2433:4e03] handleEvents started (2) 2010-05-30 23:20:25.269 GKTank[2433:4e03] ~ DNSServiceRegister callback: Ref=135f70, Flags=2, ErrorType=0 name=00oRWv-0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:20:25.375 GKTank[2433:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=8 (name=[en2]), ErrorType=0 name=00oRWv-0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:20:30.691 GKTank[2433:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 name=00K83eS0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:20:30.855 GKTank[2433:4e03] ~ DNSServiceQueryRecord callback: Ref=13a320, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 fullname=00k83es0a..iphone\032von\032tamara._gktank._udp.local. rrtype=16 rrclass=1 rdlen=18 ttl=7200 2010-05-30 23:20:30.872 GKTank[2433:4e03] ** peer 480260628: oldbusy=0, newbusy=0 2010-05-30 23:20:35.215 GKTank[2433:207] ** Stop resolving? potentially previous resolves 2010-05-30 23:20:35.226 GKTank[2433:207] **** BEGIN RESOLVE: 480260628 and it stays that way. On the second iPhone the device is listed as not available and grayed out. If I select each other at the same time it says this: 2010-05-30 23:24:31.416 GKTank[2442:4e03] handleEvents started (2) 2010-05-30 23:24:32.321 GKTank[2442:4e03] ~ DNSServiceRegister callback: Ref=135120, Flags=2, ErrorType=0 name=006JiAZ0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:24:32.419 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=8 (name=[en2]), ErrorType=0 name=006JiAZ0A..David’s iPhone regtype=_gktank._udp. domain=local. 2010-05-30 23:24:57.156 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 name=004_n6C0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:24:57.308 GKTank[2442:4e03] ~ DNSServiceQueryRecord callback: Ref=13a320, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 fullname=004_n6c0a..iphone\032von\032tamara._gktank._udp.local. rrtype=16 rrclass=1 rdlen=18 ttl=7200 2010-05-30 23:24:57.314 GKTank[2442:4e03] ** peer 203104196: oldbusy=0, newbusy=0 2010-05-30 23:25:02.383 GKTank[2442:207] ** Stop resolving? potentially previous resolves 2010-05-30 23:25:02.425 GKTank[2442:207] **** BEGIN RESOLVE: 203104196 2010-05-30 23:25:13.562 GKTank[2442:4e03] ~ DNSServiceQueryRecord callback: Ref=13a320, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 fullname=004_n6c0a..iphone\032von\032tamara._gktank._udp.local. rrtype=16 rrclass=1 rdlen=18 ttl=7200 2010-05-30 23:25:13.569 GKTank[2442:4e03] ** peer 203104196: oldbusy=0, newbusy=1 2010-05-30 23:25:33.660 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=0, IFIndex=-3 (name=[]), ErrorType=0 name=004_n6C0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:25:33.671 GKTank[2442:4e03] Peer [203104196] removed? (0). 2010-05-30 23:25:33.683 GKTank[2442:4e03] GKPeer[139f10] 203104196 service count old=1 new=0 2010-05-30 23:25:37.786 GKTank[2442:4e03] ~ DNSServiceBrowse callback: Ref=134f30, Flags=2, IFIndex=-3 (name=[]), ErrorType=0 name=004_n6C0A..iPhone von Tamara regtype=_gktank._udp. domain=local. 2010-05-30 23:25:37.816 GKTank[2442:4e03] GKPeer[139f10] 203104196 service count old=0 new=1 ... and waits forever. Does anybody know whats wrong with this sample??

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  • NSString - max 1 decimal of a float

    - by ncohen
    Hi everyone, I would like to use a float in a NSString. I used the stringWithFormat and a %f to integrate my float into the NSString. The problem is that I would like to display only one decimal (%.1f) but when there is no decimals I don't want to display a '.0' . How can I do that? Thanks

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  • NSTableView binding problem

    - by Niklas Ottosson
    I have only just started with XCode (v3.2.2) and Interface Builder and have run into a problem. Here is what I have done: I have made a class to be the datasource of a NSTableView: @interface TimeObjectsDS : NSControl { IBOutlet NSTableView * idTableView; NSMutableArray * timeObjects; } @property (assign) NSMutableArray * timeObjects; @property (assign) NSTableView * idTableView; - (id) init; - (void) dealloc; - (void) addTimeObject: (TimeObj *)timeObject; - (int) count; // NSTableViewDataSource Protocol functions - (int)numberOfRowsInTableView:(NSTableView *)tableView; - (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row: (int)row; I have then bound my NSTableView in the View to this datasource like so: I have also bound the View NSTableView to the Model idTableView variable in Interface Builder seen above In the init function I add a element to the mutable array. This is displayed correctly in the NSTableView when I run the application. However when I add another element to the array (of same type as in init) and try to call [idTableView reloadData] on the View nothing happens. In fact the Model idTableView is null. When printing the variable with NSLog(@"idTableView: %@", idTableView) I get "idTableView: (null)" Im runing out of ideas how to fix this. Any ideas to what I could do to fix the binding?

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  • Detecting iPhone camera orientation

    - by Stephen Petschulat
    I'm getting inconsistent results depending on whether I get the image directly from the camera in the callback or choosing it from the camera roll. In the UIImagePickerControllerDelegate callback method, the UIImage.imageOrientation comes up as UIImageOrientationRight no matter how the photo is taken. When reading it off the Camera Roll, a landscape shot (turned left) comes up UIImageOrientationUp while a portrait shot comes up UIImageOrientationRight. How can I reliably get the camera orientation in both situations?

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  • Can not read and save a number from/into an .plist

    - by Flocked
    Hello, I created a property list with the name propertys.plist. Then I wrote this: NSString *path = [[NSBundle mainBundle] bundlePath]; NSString *finalPath = [path stringByAppendingPathComponent:@"speicherung.plist"]; NSMutableArray *plistData = [[NSMutableArray arrayWithContentsOfFile:finalPath] retain]; int a = [plistData objectAtIndex:1]; NSLog(@"%i", a); // returns 41386032, but the right number is 0 a = a + 1; NSNumber *ff = [NSNumber numberWithInt:a]; [plistData insertObject:ff atIndex:1]; NSLog(@"%@", [plistData objectAtIndex:1]); // returns 41386033 [plistData writeToFile:finalPath atomically:YES]; My app always get the wrong number. Why?

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  • How to send sms and receive sms in Iphone sdk?

    - by monish
    Hi Guys, I need a help from ur side.Here I want to implement the sms functionality in my application.Is there anyway to or any documentation to implement this functionality. can anyone having sample code regarding to this? Anyone's help will be much appreciated. Thank you, Monish.

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  • NSString copy not copying?

    - by Scotty Allen
    NSString *myString = @"sample string"; NSString *newString = [NSString stringWithString: myString]; If I set a breakpoint after these two lines, the pointer for myString is the same as the pointer for newString. WTF? Isn't NSString copy supposed to return a pointer to a new object? Or am I missing something fundamental about how copy is supposed to work?

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  • Add UITabBar Control!

    - by Taimur Hamza
    hi, I m stuck in a really simple problem. And i m afraid my question might annoy some people. The problem i am facing in short is that i want to add UITabBar Control to my iphone application other than the main screen. Let me explain, I have done everything successfully Added UItabbar control from IB in the main window's xib, added a variable at the back end , associated it by dragging the line. Also added a UIWindow variable and wrote these lines . [window addSubview:tabBarController.view]; [window makeKeyAndVisible]; when i launch the application a blank window appears and tab bar shows on its bottom. But the problem i dont want to add it to a particular window which is inside my app. Its no the first screen of my app. Its actually the 3rd screen of my app. Can anybody help ? thanks Taimur

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  • How to disable multiple touches on a ScrollView and UIImage

    - by Rob
    I have a scrollview that I am loading images into that the user can touch and play a sound. However, the program is getting confused when I press one image with one finger and then another one with a different finger. It thinks you are pushing the same button again and therefore plays the sound again (so you have two of the same sounds playing at the same time even though you may have pressed a different sound button). I tried setting exclusiveTouch for each UIImage but that didn't seem to work in this case for some reason. What am I missing or is there a better way to do this? Here is some code: for creating buttons.... - (void) createButtons { CGRect myFrame = [self.outletScrollView bounds]; CGFloat gapX, gapY, x, y; int columns = 3; int myIndex = 0; int viewWidth = myFrame.size.width; int buttonsCount = [g_AppsList count]; float actualRows = (float) buttonsCount / columns; int rows = buttonsCount / columns; int buttonWidth = 100; int buttonHeight = 100; if (actualRows > rows) rows++; //set scrollview content size to hold all the glitter icons library gapX = (viewWidth - columns * buttonWidth) / (columns + 1); gapY = gapX; y = gapY; int contentHeight = (rows * (buttonHeight + gapY)) + gapY; [outletScrollView setContentSize: CGSizeMake(viewWidth, contentHeight)]; UIImage* myImage; NSString* buttonName; //center all buttons to view int i = 1, j = 1; for (i; i <= rows; i++) { //calculate gap between buttons gapX = (viewWidth - (buttonWidth * columns)) / (columns + 1); if (i == rows) { //this is the last row, recalculate gap and pitch gapX = (viewWidth - (buttonWidth * buttonsCount)) / (buttonsCount + 1); columns = buttonsCount; }//end else x = gapX; j = 1; for (j; j <= columns; j++) { //get shape name buttonName = [g_AppsList objectAtIndex: myIndex]; buttonName = [NSString stringWithFormat: @"%@.png", buttonName]; myImage = [UIImage imageNamed: buttonName]; TapDetectingImageView* imageView = [[TapDetectingImageView alloc] initWithImage: myImage]; [imageView setFrame: CGRectMake(x, y, buttonWidth, buttonHeight)]; [imageView setTag: myIndex]; [imageView setContentMode:UIViewContentModeScaleToFill]; [imageView setUserInteractionEnabled: YES]; [imageView setMultipleTouchEnabled: NO]; [imageView setExclusiveTouch: YES]; [imageView setDelegate: self]; //add button to current view [outletScrollView addSubview: imageView]; [imageView release]; x = x + buttonWidth + gapX; //increase button index myIndex++; }//end for j //increase y y = y + buttonHeight + gapY; //decrease buttons count buttonsCount = buttonsCount - columns; }//end for i } and for playing the sounds... - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //stop playing theAudio.stop; // cancel any pending handleSingleTap messages [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(handleSingleTap) object:nil]; UITouch* touch = [[event allTouches] anyObject]; NSString* filename = [g_AppsList objectAtIndex: [touch view].tag]; NSString *path = [[NSBundle mainBundle] pathForResource: filename ofType:@"m4a"]; theAudio=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL]; theAudio.delegate = self; [theAudio prepareToPlay]; [theAudio setNumberOfLoops:-1]; [theAudio setVolume: g_Volume]; [theAudio play]; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { BOOL allTouchesEnded = ([touches count] == [[event touchesForView:self] count]); if (allTouchesEnded) { //stop playing theAudio.stop; }//end if //stop playing theAudio.stop; }

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  • Error Playing video from server with MPMoviePlayerController

    - by skiria
    I try to play a video on the server with this code. I have a error. //Play the video from server - (IBAction)playVideo:(id)sender; { NSLog(@"URLVIDEO %@", aVideo.urlVideo); MPMoviePlayerController *VideoPlayer = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL URLWithString:aVideo.urlVideo]]; [VideoPlayer play]; } //Error on con console Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Content URL must not be nil.' aVideo.urlVideo is a NSString and it's correct when I copy the result on the NSLog on the browser.

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  • Get directory contents in date modified order

    - by nevan
    Is there an method to get the contents of a folder in a particular order? I'd like an array of file attribute dictionaries (or just file names) ordered by date modified. Right now, I'm doing it this way: get an array with the file names get the attributes of each file store the file's path and modified date in a dictionary with the date as a key Next I have to output the dictionary in date order, but I wondered if there's an easier way? If not, is there a code snippet somewhere which will do this for me? Thanks.

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