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  • Problem with playing a sound when a button is clicked.

    - by iSharreth
    in my code: import "MyViewController.h" import (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]; } But it is showing a warning that Class MyViewController does not implement AVAudioplayerDelegate. Anyone please help. I had included the AVFoundation.Framework.

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  • write() causes fatal crash when filedescriptor becomes invalid

    - by ckrames1234
    I'm writing an iPhone App with a webserver in it. To handle a web request, I take the web request and write() to it the data that I want to send back. When I try to download a moderately sized file (3-6MB) it works fine, but if I cancel the download halfway through, the app crashes and leaves no trace of an error. I'm thinking that the file descriptor becomes invalid halfway through the write, and causes the crash. I really don't know if this is what causes the crash, i'm just assuming. I'm basing my webserver off of this example. NSString *header = @""; NSData *data = [NSData dataWithContentsOfFile:fullPath]; write (fd, [header UTF8String], [header length]); write(fd, [data bytes], [data length]); close(fd); Does anyone know how to fix this? I was thinking about chunking the data and then writing each part, but I don't think it would help.

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  • Storyboard elements are not sized properly on the device

    - by Joel Fischer
    In the storyboard, I am placing a table view element into a subclassed UIView. The element is not appearing on the iPad device I am running it on the same as it appears in the storyboard however. This also happens for additional content that I place into the storyboard. Below is a screenshot as it appears in the storyboard, as well as UI width/height information. And here is the description of the UI file running on the iPad. https://gist.github.com/4323186 (embedding it directly into the post is giving me problems) You'll notice that the tableview is explicitly set at 178 width, and is showing up in the description as 276 width. My initial thought was that perhaps a cell was forcing the parent to be larger (I'm very new to iOS UI development), but drilling into that shows the prototype cell it appears that the width is defined by it's parent at 178. The image views and label also are appearing in the incorrect spot, as shown in the second image below.

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  • Adding picture in pickerview

    - by iSharreth
    UIImageView *one = [[UIImageView alloc]initWithImage:[[UIImage alloc] initWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ball1.png"]]] ; UIImageView *two = [[UIImageView alloc]initWithImage:[[UIImage alloc] initWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ball2.png"]]] ; UIImageView *three = [[UIImageView alloc]initWithImage:[[UIImage alloc] initWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"ball3.png"]]] ; arrayBalls = [[NSArray alloc]initWithObjects:one,two,three,nil]; I used the above code for displaying image in the pickerview. But the application is crashing when executing this code. Anyone please help.

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  • how a view controller know when it is dismissed or poped out of the navigation controller stack?

    - by Thanh-Cong Vo
    Hi all, My view controller needs to know when it is poped out of the navigation controller stack, so that it can retain itself, wait and release itself later with another notification. I intend to do like that when the view is sent dealloc message: - (void)dealloc { if (self.isPerformingSomeTask) { self.isPopedOut = YES; [self retain]; return; } [super dealloc]; } But I think this is not a good solution? Any idea?

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  • How to change by using CVGrayscaleMat

    - by Babul
    With the following code the image showed as above is converted as below image... Their it's showing black background with gray lines.....i want white background with gray lines .. Please guide me .. i am new to iPhone Thanks alot in Advance - (void)viewDidLoad { [super viewDidLoad]; // Initialise video capture - only supported on iOS device NOT simulator #if TARGET_IPHONE_SIMULATOR NSLog(@"Video capture is not supported in the simulator"); #else _videoCapture = new cv::VideoCapture; if (!_videoCapture->open(CV_CAP_AVFOUNDATION)) { NSLog(@"Failed to open video camera"); } #endif // Load a test image and demonstrate conversion between UIImage and cv::Mat UIImage *testImage = [UIImage imageNamed:@"testimage.jpg"]; double t; int times = 10; //-------------------------------- // Convert from UIImage to cv::Mat NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { cv::Mat tempMat = [testImage CVMat]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; [pool release]; NSLog(@"UIImage to cv::Mat: %gms", t); //------------------------------------------ // Convert from UIImage to grayscale cv::Mat pool = [[NSAutoreleasePool alloc] init]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { cv::Mat tempMat = [testImage CVGrayscaleMat]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; [pool release]; NSLog(@"UIImage to grayscale cv::Mat: %gms", t); //-------------------------------- // Convert from cv::Mat to UIImage cv::Mat testMat = [testImage CVMat]; t = (double)cv::getTickCount(); for (int i = 0; i < times; i++) { UIImage *tempImage = [[UIImage alloc] initWithCVMat:testMat]; [tempImage release]; } t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency() / times; NSLog(@"cv::Mat to UIImage: %gms", t); // Process test image and force update of UI _lastFrame = testMat; [self sliderChanged:nil]; } - (IBAction)capture:(id)sender { if (_videoCapture && _videoCapture->grab()) { (*_videoCapture) >> _lastFrame; [self processFrame]; } else { NSLog(@"Failed to grab frame"); } } - (void)processFrame { double t = (double)cv::getTickCount(); cv::Mat grayFrame, output; // Convert captured frame to grayscale cv::cvtColor(_lastFrame, grayFrame, cv::COLOR_RGB2GRAY); // Perform Canny edge detection using slide values for thresholds cv::Canny(grayFrame, output, _lowSlider.value * kCannyAperture * kCannyAperture, _highSlider.value * kCannyAperture * kCannyAperture, kCannyAperture); t = 1000 * ((double)cv::getTickCount() - t) / cv::getTickFrequency(); // Display result self.imageView.image = [UIImage imageWithCVMat:output]; self.elapsedTimeLabel.text = [NSString stringWithFormat:@"%.1fms", t]; }

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  • UIColor app crashing

    - by coure06
    i have a global variable UIColor *textColor; I am update this variable by the code textColor = [UIColor colorWithRed:fr green:fg blue:fb alpha:1.0]; then assigning this color to Label like this myLabel.textColor = textColor; It only work once, when i again call with updated values and assign label new values app crashes... textColor = [UIColor colorWithRed:fr green:fg blue:fb alpha:1.0]; myLabel.textColor = textColor;

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  • longitude and latitude for current location returned from CLLocationManager in UK region is not corr

    - by bond
    Hi I am getting latitude and longitude of current location from CLLocationManager delegate method. It works fine for some region but its giving problem in UK region. When it is used in UK region, the current location longitude and latitude returned from CLLocationManager is not proper. Thanks heres a part of the logic i am using. -(void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.locationManager = [[CLLocationManager alloc] init]; if(self.locationManager.locationServicesEnabled) { self.locationManager.delegate = self; self.locationManager.distanceFilter = kCLDistanceFilterNone; self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; } } -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSLog(@"Updating"); //if the time interval returned from core location is more than 15 seconds //we ignore it because it might be from an old session if ( abs([newLocation.timestamp timeIntervalSinceDate: [NSDate date]]) < 15) { self.latitude = newLocation.coordinate.latitude; self.longitude = newLocation.coordinate.longitude; NSLog(@"longitude=%f-- latitude=%f--",self.longitude,self.latitude); [self.locationManager stopUpdatingLocation]; [self removeActivityIndicator]; [[self locationSaved] setHidden:NO]; [[self viewLocationInMap] setEnabled:YES]; }}

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  • Iphone SDK array initlised at viewdidload and released at dealloc is causing leak?

    - by Skeep
    Hi All, I am new to iphone development and i am getting ready to submit my first app. I have an array initlised at viewdidload and released at dealloc, however it is causing a leak. My question is why would this happen is it because the dealloc has not run? My Code is as follows the NSMutableArray called listOfItems is referenced in my .h file for the UITableView. The listOfItems array is used to populate the table. In the viewDidLoad method i have this code listOfItems = [[NSMutableArray alloc] init]; and in the dealloc i have: [listOfItems release]; When watching leaks in instruments I get a NSArray leak which when I drill down points to the line: listOfItems = [[NSMutableArray alloc] init]; Am i putting all this in the right place? Thanks

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  • Follow up viewDidUnload vs. dealloc question...

    - by entaroadun
    Clarification question as a follow up to: http://stackoverflow.com/questions/2261972/what-exactly-must-i-do-in-viewdidunload http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc So let's say there's a low memory error, and the view is hidden, and viewDidUnload is called. We do the release and nil dance. Later the entire view stack is not needed, so dealloc is called. Since I already have the release and nil stuff in viewDidUnload, I don't have it in dealloc. Perfect. But if there's no low memory error, viewDidUnload is never called. dealloc is called and since I don't have the release and nil stuff, there's a memory leak. In other words, will dealloc ever be called without viewDidUnload being called first? And the practical follow up to that is, if I alloc and set something in viewDidLoad, and I release it and set to nil in viewDidUnload, do I leave it out of dealloc, or do I do a defensive nil check in dealloc and release/nil it if it's not nil?

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  • Loading animation Memory leak

    - by Ayaz Alavi
    Hi, I have written network class that is managing all network calls for my application. There are two methods showLoadingAnimationView and hideLoadingAnimationView that will show UIActivityIndicatorView in a view over my current viewcontroller with fade background. I am getting memory leaks somewhere on these two methods. Here is the code -(void)showLoadingAnimationView { textmeAppDelegate *textme = (textmeAppDelegate *)[[UIApplication sharedApplication] delegate]; [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES]; if(wrapperLoading != nil) { [wrapperLoading release]; } wrapperLoading = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0)]; wrapperLoading.backgroundColor = [UIColor clearColor]; wrapperLoading.alpha = 0.8; UIView *_loadingBG = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 480.0)]; _loadingBG.backgroundColor = [UIColor blackColor]; _loadingBG.alpha = 0.4; circlingWheel = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; CGRect wheelFrame = circlingWheel.frame; circlingWheel.frame = CGRectMake(((320.0 - wheelFrame.size.width) / 2.0), ((480.0 - wheelFrame.size.height) / 2.0), wheelFrame.size.width, wheelFrame.size.height); [wrapperLoading addSubview:_loadingBG]; [wrapperLoading addSubview:circlingWheel]; [circlingWheel startAnimating]; [textme.window addSubview:wrapperLoading]; [_loadingBG release]; [circlingWheel release]; } -(void)hideLoadingAnimationView { [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; wrapperLoading.alpha = 0.0; [self.wrapperLoading removeFromSuperview]; //[NSTimer scheduledTimerWithTimeInterval:0.8 target:wrapperLoading selector:@selector(removeFromSuperview) userInfo:nil repeats:NO]; } Here is how I am calling these two methods [NSThread detachNewThreadSelector:@selector(showLoadingAnimationView) toTarget:self withObject:nil]; and then somewhere later in the code i am using following function call to hide animation. [self hideLoadingAnimationView]; I am getting memory leaks when I call showLoadingAnimationView function. Anything wrong in the code or is there any better technique to show loading animation when we do network calls?

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  • Problem creating checklist (similar to TouchCells sample code) app for iPhone. Random cells get chec

    - by Jonah
    I've been having a problem creating a checklist in the style of the TouchCells example from the Apple sample code. Basically, it is a table that allows multiple selection of its items and gives each selected item a check mark. The problem I'm having is that when I select an item and then scroll down the screen, another item (off the screen) will randomly be selected. It seems that it is usually the next cell to be loaded on the screen. I couldn't figure out what I was doing wrong so I tested it with Apple's TouchCells code. In their program though, they only have 6 cells and there is no room to scroll. So, I duplicated some of the items from the plist file to make more cells and... the same problem pops up. If you select a cell and then scroll, another cell will randomly be selected. Update I recently tried the iPhone Dev Cookbook sample code named "Checks" and... you guessed it, the same problem. Here's the link: http://code.google.com/p/cookbooksamples/downloads/list This is driving me nuts. Is it a bug or am I doing something wrong? Does anyone know how to fix this? Thanks! Also, does anyone know of any sample code that shows how to do this?

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  • NSTimer as a self-targeting ivar.

    - by Matt Wilding
    I have come across an awkward situation where I would like to have a class with an NSTimer instance variable that repeatedly calls a method of the class as long as the class is alive. For illustration purposes, it might look like this: // .h @interface MyClock : NSObject { NSTimer* _myTimer; } - (void)timerTick; @end - // .m @implementation MyClock - (id)init { self = [super init]; if (self) { _myTimer = [[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(timerTick) userInfo:nil repeats:NO] retain]; } return self; } - (void)dealloc { [_myTimer invalidate]; [_myTImer release]; [super dealloc]; } - (void)timerTick { // Do something fantastic. } @end That's what I want. I don't want to to have to expose an interface on my class to start and stop the internal timer, I just want it to run while the class exists. Seems simple enough. But the problem is that NSTimer retains its target. That means that as long as that timer is active, it is keeping the class from being dealloc'd by normal memory management methods because the timer has retained it. Manually adjusting the retain count is out of the question. This behavior of NSTimer seems like it would make it difficult to ever have a repeating timer as an ivar, because I can't think of a time when an ivar should retain its owning class. This leaves me with the unpleasant duty of coming up with some method of providing an interface on MyClock that allows users of the class to control when the timer is started and stopped. Besides adding unneeded complexity, this is annoying because having one owner of an instance of the class invalidate the timer could step on the toes of another owner who is counting on it to keep running. I could implement my own pseudo-retain-count-system for keeping the timer running but, ...seriously? This is way to much work for such a simple concept. Any solution I can think of feels hacky. I ended up writing a wrapper for NSTimer that behaves exactly like a normal NSTimer, but doesn't retain its target. I don't like it, and I would appreciate any insight.

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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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  • Why when I render a scene with a revolving camera objects that you'd expect to appear behind others

    - by seaworthy
    Hello, I am rendering a scene in which I have two spheres. I am revolving a camera around one of them. What happens is counter-intuitive. When the camera goes around the sphere the other gets in front of it when you'd expect it to be behind. So it appears as though the spheres aren't revolving around each other and the one the should go around is always upfront. Please help. Here is the code that renders the scene: glLoadIdentity(); [self positionCamera]; glutSolidSphere(2, 12,12); glPushMatrix(); glTranslatef(5, 0, 0); glutSolidSphere(0.5, 12,12); glPopMatrix(); glFlush(); This block is part of a class that gets called on using. [NSTimer scheduledTimerWithTimeInterval:DEFAULT_ANIMATION_INTERVAL target:self selector:@selector(drawRect) userInfo:nil repeats:YES]; And -(void)positionCamera{} Contains math do camera revolution and gluLookAt()

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  • system settings for iphone

    - by Viral
    hi friends, I m making alarm application, for that I need to access some system settings like System time format (24 hrs or 12 hrs), System Volume settings And make system Auto lock after some time intervals. I don't know how to implement such settings using code, if any one know about this please let me know. thank you in advance.

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  • Unselected UIPickerView value

    - by morticae
    According to the documentation, if a UIPickerView has no selected value, the expected return from selectedRowInComponent: should be: "A zero-indexed number identifying the selected row, or -1 if no row is selected." However, if I check the value the very line after initializing one, its value is 0. Even if I then manually set it to -1, it still returns 0. I would like to be able to detect whether the user has chosen a value yet or not, without recording it in a local variable. Is this possible? example: UIPickerView *picker = [[UIPickerView alloc] initWithFrame:CGRectMake(0.0, 46.0, 320.0, 216.0)]; [picker selectRow:-1 inComponent:0 animated:NO]; NSLog(@"SELECTED %d", [picker selectedRowInComponent:0]); expected output: SELECTED -1 actual output: SELECTED 0

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  • UIDatePicker in UIDatePickerModeCountDownTimer mode: how to get/set the hours and minutes via code?

    - by R31n4ld0
    Hello, guys. How to get/set the hours and minutes via code from a UIDatePicker in UIDatePickerModeCountDownTimer mode? The situation: I have an interface in that a user selects just hours and minutes. Then, he saves the information (so, I have to get the hours and minutes from UIDatePicker via code to save in a DB). When the user is editing the information saved previously, I want to start the interface with the saved hours/minutes (so, I have to set the UIDatePicker hours and minutes retrieved from DB via code). How do I do that with the UIDatePiker in UIDatePickerModeCountDownTimer mode? Thanks in advance.

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  • How to save video from a url to disk, also how to begin playback after some buffering?

    - by Shizam
    First question is, given a url to an mp4 video, how can I save that file to disk? The followup to that is while its saving, can I begin playback after its buffered some of the video to disk or do I have to wait for the entire file to be written and then: MPMoviePlayerController* theMovie=[[MPMoviePlayerController alloc] initWithContentURL:theURL]; using the path to the local file. Thanks, Sam

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