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• Need help using UIImagePNGRepresentation

  - by mustanggal511

  I'm trying to save a UIImageView image to a png file, and then use that file as a GLTexture. I'm having trouble with this, when I try to run my code in the simulator, XCode says it succeeded, but the simulator crashes with no error messages. Can someone help me with this? Here is my code: NSString *dataFilePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Picture.png"]; NSData *imageData = UIImagePNGRepresentation(imageView.image); [imageData writeToFile:dataFilePath atomically:YES]; // Load image into texture loadTexture("Picture.png", &Input, &renderer);

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• How do I add NSDecimalNumbers?

  - by Terry B

  OK this may be the dumb question of the day, but supposing I have a class with : NSDecimalNumber *numOne = [NSDecimalNumber numberWithFloat:1.0]; NSDecimalNumber *numTwo = [NSDecimalNumber numberWithFloat:2.0]; NSDecimalNumber *numThree = [NSDecimalNumber numberWithFloat:3.0]; Why can't I have a function that adds those numbers: - (NSDecimalNumber *)addThem { return (self.numOne + self.numTwo + self.numThree); } I apologize in advance for being an idiot, and thanks!

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• Attempted to render a circle in opengl es 1.1, renders as oval

  - by eipxen

  Hi all, I attempted to render a circle in opengl es 1.1 as a test before building a larger program, but it renders as an oval. Here is the code I use to generate and render my vertices: static const int numVerts = 40; static GLfloat myFirstCircle[82]; myFirstCircle[0] = 0.0f; myFirstCircle[1] = 0.0f; for (int i = 2; i < (numVerts+1)*2; i+=2) { myFirstCircle[i] = .5 * cosf(i*2*3.14159/numVerts); myFirstCircle[i+1] = .5 * sinf(i*2*3.14159/numVerts); } glVertexPointer(2, GL_FLOAT, 0, myFirstCircle); glEnableClientState(GL_VERTEX_ARRAY); glDrawArrays(GL_TRIANGLE_FAN, 0, 22); I'm still somewhat new to this system, so I may have a silly error that I do not see, but it seems to me like this should generate 40 vertices on a circle of radius .5. When it renders, the shape on screen appears to be an oval, significantly taller than it is wide. My question is thus: why is my circle rendering this way, and what could I do to fix it? This is the first question on stackoverflow, so I'm not sure how to share an image of my output.

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• Call a function from another Class - Obj C

  - by AndrewDK

  I'm trying to figure out how I can call a function from another one of my classes. I'm using a RootViewController to setup one of my views as lets say AnotherViewController So in my AnotherViewController im going to add in on the .h file @class RootViewController And in the .m file im going to import the View #import "RootViewController.h" I have a function called: -(void)toggleView { //do something } And then in my AnotherViewController I have a button assigned out as: -(void)buttonAction { //} In the buttonAction I would like to be able to call the function toggleView in my RootViewController. Can someone clarify on how I do this. I've tried adding this is my buttonAction: RootViewController * returnRootObject = [[RootViewController alloc] init]; [returnRootObject toggleView]; But I dont think that's right. Thanks in advanced.

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• Get unique artist names from MPMediaQuery

  - by Akash Malhotra

  I am using MPMediaQuery to get all artists from library. Its returning unique names I guess but the problem is I have artists in my library like "Alice In Chains" and "Alice In Chains ". The second "Alice In Chains" has some white spaces at the end, so it returns both. I dont want that. Heres the code... MPMediaQuery *query=[MPMediaQuery artistsQuery]; NSArray *artists=[query collections]; artistNames=[[NSMutableArray alloc]init]; for(MPMediaItemCollection *collection in artists) { MPMediaItem *item=[collection representativeItem]; [artistNames addObject:[item valueForProperty:MPMediaItemPropertyArtist]]; } uniqueNames=[[NSMutableArray alloc]init]; for(id object in artistNames) { if(![uniqueNames containsObject:object]) { [uniqueNames addObject:object]; } } Any ideas?

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• Making a view scrollable when keyboard active

  - by Dan Ray

  I have a view with half a dozen text fields and labels, and a button. I want it to be that when the keyboard pops up, the view becomes scrollable, so you can scroll the view up and see the bottom half of the fields without having to dismiss the keyboard to get to them. Just putting it inside a UIScrollView doesn't seem to do it.

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• Link to pdf within app

  - by Thijs

  I've got an iOS app that at one point opens a link to a website in a webview. These links are kept in a plist file (so it is easy to maintain them as the app evolves). What I want to do next is to also link to PDF's (or any picture of text file format, of even a html format, this is flexible) that are kept within the app. And I would like to do this as much as possible from within the existing app structure. So, is it possible to create a link that can be put in the plist as a web-link, but instead opens a file on the device itself (possibly in the webview)? And how would I go about that? Any ideas? Thanx in advance for your help!

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• SQLITE Blob OR file system for images

  - by saint cyr

  Hello, I am building an application based on a single table with a column with text. Occassionally, an adjacent column will have an image. Is it better to store this image as a BLOB in SQLITE or should I store them on the file system and reference them from my programs. Thanks!

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• NSString stringWithContentsOfFile failing with what seems to be the wrong error code

  - by deanWombourne

  Hello. I'm trying to load a file into a string. Here is the code I'm using: NSError *error = nil; NSString *fullPath = [[NSBundle mainBundle] pathForResource:filename ofType:@"html"]; NSString *text = [NSString stringWithContentsOfFile:fullPath encoding:NSUTF8StringEncoding error:&error]; When passed in @"about" as the filename, it works absolutely fine, showing the code works. When passed in @"eula" as the filename, it fails with 'Cocoa error 258', which translates to NSFileReadInvalidFileNameError. However, if I swap the contents of the files over but keep the names the same, the other file fails proving there is nothing wrong with the filename, it's something to do with the content. The about file is fairly simple HTML but the eula file is a massive mess exported from Word by the legal department. Does anyone know of anything inside a HTML file that could cause this error to be raised? Much thanks, Sam

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• With and Without Dot Notation?

  - by fuzzygoat

  I am trying to write the following without using dot notation ... [scrollView setMinimumZoomScale: scrollView.bounds.size.width / image.size.width]; Is this right? [scrollView setMinimumZoomScale: [scrollView bounds].size.width / [image size].width]; cheers Gary.

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• How to remove an observer for NSNotification in a UIView?

  - by sudo rm -rf

  Hello! I've added an observer in a custom UIView I've created under initWithFrame:. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateZipFromLocation:) name:@"zipFoundFromLocation" object:nil]; The problem is, this view is a subview. When the view is loaded again, it calls the initWithFrame message again, thus adding two observers and so on. How can I remove the observer when the view is going to disappear? Since it is a UIView, it says that viewWillDisappear:(BOOL)animated is not a valid method. Any ideas?

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• UISwitch quick toggle multiple times.

  - by Tejaswi Yerukalapudi

  I was playing around my app and I was toggling a UISwitch really fast (who can resist?). So, I toggled it really fast for 10-15 times, an array that should contain the data from the table view cell that I have my switch in either has extra copies of the same cell sometimes, just one copy (the correct case) a few times and no data in it at all some times. The app works fine if it's toggled at normal speed. I'm pretty sure this scenario won't really happen with my users, but I'm still curious as to why it's happening. Thanks, Teja

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• How are people popping their UINavigationController stacks under a UITabBarController?

  - by RexOnRoids

  I have four UINavigationControllers assigned each to a tab in a UITabBarController. Each UINavigationController manages a UIViewController, which may itself branch out into other UIViewControllers below it hierarchally. My question is, in a case in which a user, under one tab, has navigated to a UIViewController that hierarchally BELOW the main UIViewController managed by the UINavigationController, and then the user pushes a different tab, and then goes back to the original tab, HOW can I make it so that the user is presented with the main UIViewController managed by the UINavigation controller? and not the page where he left off?

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• pushing view controller inside a tab bar from app delegate, after a notification.

  - by shani

  hi i have an app with tab bar and a navigation controller inside every tab. i have set a notification that when it lunches the user can get lunch the app by pressing the action on the alert. i want to redirect the user to one of the views inside one of the controllers. i have tried this: (void)application:(UIApplication *)app didReceiveLocalNotification:(UILocalNotification *)notif { NSArray *data = [notif.userInfo objectForKey:@"todoDate"]; NSInteger ind = [[data objectAtIndex:2] integerValue]; QuickViewController *detailViewController ; detailViewController = [[QuickViewController alloc] initWithNibName:@"QuickViewController" bundle:nil]; detailViewController.title = @"Edit"; detailViewController.personName = [data objectAtIndex:0]; detailViewController.DelitionDate=[data objectAtIndex:1]; detailViewController.personCategory=@"NO Category"; detailViewController.personID = ind r ; rootControler.selectedIndex = 1; [rootControler.tabBarController.selectedViewController.navigationController pushViewController:detailViewController animated:YES]; } but nothing is happening (no crashing) except of the :rootControler.selectedIndex = 1; when i tried : presentModalViewController i got the view perfectly but without the navigation controller. thanks shani

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• i have latitude and Longitude how can i display Annotation in the mapview?

  - by Ankit Vyas

  i have got the Latitude and Longitude from XML Parsing how can i show MapAnnotation(pin) on the Map,Please help me....

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• How to programatically set cell.textLabel.text from a different view?

  - by Andy

  I've got a view controller, call it VC1, that's a table view. When I tap a cell in the table view, I am presented with a new view controller, call it VC2, which is a short list of choices. After making a choice, I want to dismiss VC2 and set the cell.textLabel.text property of the VC1 cell I originally tapped to the value I selected in VC2. Conceptually speaking, what is the proper way to do this? I've tried a handful of different approaches, but all of them seem wonky at best, and only one of them actually worked - although it was the most cumbersome of all, passing references to both view controllers and table view cells and all kinds of things. It just feels like I'm making a mountain out of what is probably a mole hill. This is such a common paradigm that I find it hard to believe there's not a simple method for doing it. Thanks in advance for any input you can offer.

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• UIView keep forward toutches

  - by donodare

  Hi all, I subclassed UIImageView for controlling touch events. The problem is that when i do userInteractionEnabled = NO, it doesn't work, i can still touch it and the touch methods response. Even if i add big subview over it the touches happen. Any suggest?

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• Easier way to add lots of images to an array

  - by Sam Jarman

  Hey Guys In an effort to 'clean up' my code - I was wondering if this could be made simpler. I have 32 images and I was adding them like this [theCarPics addObject:[UIImage imageNamed:@"1.jpg"]]; [theCarPics addObject:[UIImage imageNamed:@"2.jpg"]]; //... [theCarPics addObject:[UIImage imageNamed:@"32.jpg"]]; is there a simpler way? loop perhaps? Any ideas would be appreciated guys Thanks Sam

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• Returning NSNull from actionForLayer:forKey

  - by MrHen

  If I implement the CALayer delegate method actionForLayer:forKey I can return [NSNull null] to force the CALayer to not animate any changes. Unfortunately, [NSNull null] doesn't implement the CAAction delegate and XCode kicks out the following warning: warning: class 'NSNull' does not implement the 'CAAction' protocol Here is the method code: - (id<CAAction>)actionForLayer:(CALayer *)theLayer forKey:(NSString *)theKey { //This disables the animations when moving things around //Also, don't animate the selection box. It was doing weird things if(undoGroupStarted || theLayer == self.selectionBox) { return [NSNull null]; } else { return nil; } } Am I doing something wrong? Is returning [NSNull null] bad behavior? If so, what is another way to do what I am trying to do here? If not, how do I make the compiler happy?

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• UITableView superClass for delegate?

  - by fuzzygoat

  A quick question, I am setting a delegate for UITableView and I have a question regarding setting the delegate and dataSource properties. I have noticed that the properties for delegate and dataSource are not available, I was thinking that adopting the protocols would make them available. But I am now thinking that I maybe have the superclass for my delegate class wrong. Currently I have: -(void)viewDidLoad { TestDelegate *tempDelegate = [[TestDelegate alloc] init]; [self setMyDelegate:tempDelegate]; // setDelegate // setDataSource [tempDelegate release]; [super viewDidLoad]; } My interface for TestDelegate looks like: @interface TestDelegate : NSObject <UITableViewDelegate, UITableViewDataSource> { NSArray *listData; int myCounter; } Can I ask if the above should be: @interface TestDelegate : UITableView <UITableViewDelegate, UITableViewDataSource> { NSArray *listData; int myCounter; } gary EDIT: I think it might be right as NSObject, I have a viewtableView in IB, thats what I will need to connect my delegate class to. I added to tableView in IB so maybe I just need to make it available in Xcode.

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• Flash Loaded Issue

  - by dragon

  I had dynamically create one Flash Player cs2, i had upload into my site, no of url link i had provided on my aspx page, when any one of the url is clicked,that url based flv viedeo will play..! In my case when i clicked url to play the video,player is loaded but is not visible, in the same window, but i had opened in new window in internetexploer it will playing..working fine? What the problem in open the player in same window... any one pls help me..? Thanks

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• UIScrollview : scroll with 2 fingers and not one

  - by AP

  Hello, I have a UIScrollView containing another wiew. This view need to handle single touch event for drawing. For this reason I would like to scroll using 2 fingers. I managed to get this working for 2.x SDK but it's no more working with 3.X series. Do you have idea/workaround for achieving this? Thanks in advance for your help :)

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• How can I set the background of UITableView (the tableview style is "Grouped") to use an image?

  - by ebaccount

  Hello, How can I set the background of UITableView (the tableview style is "Grouped") to use an image? Thanks

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• How do I get from a highly manual process of development and deploy to continuous integration?

  - by Tonny Dourado

  We have a development process which is completely manual. No unit tests, interface tests are manual, and merging and integration are as well. How could we go from this state to implementing continuous integration with full (or at least close to full) automation of build and test? We have a pretty intense development cycle, and are not currently using agile, so switching to agile with CI in one move would be a very complicated and expensive investment. How can we take it slowly, and still moving constantly towards a CI environment?

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• Enabling bookmarking on a UIWebView (to make shortcuts on springboard)

  - by thom

  I wan't to add shortcuts on my springboard form my application. The way i'm following is loading a UIWebView and then trying to add a bookmark. But I can't figure out how to add the "+" button to bookmark the content of my WebView... Is there a way to do so ? Or is there another way to add shortcuts on the springboard programmatically ? Thanx.

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