Hi there, Would like some suggestion... for a navigation app, i am trying to transfer data around abit. Firstly, i am using NSString appDelegate to transfer data from navigation view 1 to navigation view 2. at navigation view 1 i have this: AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate]; if(appDelegate.s...
I have a asynchronous task like so: dispatch_async(dispatch_get_main_queue(), ^{ myAsyncMethodsHere; }); Is there a way to be notified when the background task is complete? Or to call a method upon completion? I've read through the documentation and have looked into dispatch_after, but it seems to be more designed to dispatch t...
I'm reading the documentation on NSTableTview and I see the term Principal Attributes. What exactly are Principal Attributes? ...
I have two views and I want to present the second view from a method in the first view. My code works in an IBAction method, but not from one returning void. Is this a known issue, if so is there a workaround? My code is as follows (I already declared "scores" and -(void)win in FirstViewController.h): // In FirstViewController.m -...
Hi, I'm trying to find a good way to make a tap show/hide my menus, in the same way as iBooks. I set up UITapGestureRecognizer to do this, but unfortunately it means then that none of the buttons on the screen work. I know I can use tapRecognizer.cancelsTouchesInView = NO; in order to allow the touches to go through, but then of cour...
I have a japanese PDF document that I'm trying to render correctly on the iPad. I'm using the following code: CFURLRef pdfURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)pdfFilename, kCFURLPOSIXPathStyle, false); CGPDFDocumentRef pdfRef = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL); CFRelease(pdfURL); CGPDFPageR...
Hi! I need to be able to catch touch events on a UIWebView and still be able to use the webview's contents (html links, etc...) I have subclassed UIWebView and implemented methods: - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event; - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event; - (void)touchesMoved:(NSSe...
Hi everyone, I am working on my first iPhone app and making good progress. But there is one thing I just don't understand. When my app starts it displays a UIView with some functionality on it. This works fine. One of the buttons on that screen is supposed to load a new view (HistoryViewController) which contains a navigation controlle...
Hi there, I am looking for a way to turn off the iPhone screen without the iPhone going to sleep. I don't really mind if turning the screen off is against apple rules. Would setting window alpha to 0 do the trick? Is there maybe some sort of boolean value I can change? If anyone has an ideas they would be much appreciated. Many thanks...
Hello. I'm creating an app which needs to be opened if a user double clicks on a file with a certain extension.. how do i register the file extension with my app? and then read the contents?. E.G the file could have the extension words.ThisApp and it could be in XML Format.. how could i read that in objective c into an array? Objectiv...
The following will compile but if run it will crash. -(void) testFunc : (NSString *)s{ NSLog(@"%@", s); } What's wrong with this code? I call the function like this: NSString *msg = @"This is a message"; [self performSelector:@selector(testFunc) withObject:msg afterDelay:0]; [msg release]; ...
Hello, I've read many books about Iphone dev. I'm new to objective c. Why we need to add property and synthesize? Can someone explain and relate it to real life story. eg: pointer - we call cop to catch criminal Thank you ...
Let's say I have a method called foo. What's the difference between: [self foo]; and [self performSelector:@selector(foo)]; Are they the same? The first one seems so much easier, so why would you ever want to use the second one? ...
I am new to iOS developement, and i am trying to understand the whole cycle of iOS application developement, and i feel there's a missing part i just don't get it.. if the MainWindow.xib that is generated automatically by Xcode has a view that loads another xib/nib view inside it, then why we use it ? ...
I'm working with some C/C++ code that runs on Win32 and also VxWorks. It uses #ifdef WIN32 to switch to platform specific implementations. I've been using the code on the iPhone and I want to update it and keep it as portable as possible, but I'm not sure what's the best practice. So far I've been using #ifdef __APPLE__ blocks. What ...
In my project, I made an animation for my UIImageView using some pngs. I recently swapped those pngs out for different images (with different file names) and removed the previous pngs to the trash. I updated my code to reflect the file name change but when I build my application, I still see the animated images that are not referenced in...
How do I create a reusable library/module in XCode 3.2? What I want to do is create a bunch of classes that provide certain functionality compile them into some kind of library, add such a library to an existing xcode project and use the classes in it. I come from .NET world so what I want to do is basically to create an equivalent of 'a...
Hello. I will begin by saying that I'm 15 years old and from Sweden, so please excuse my English. I'm reading a book called Beginning iPhone 3 Developement - Exploring the iPhone SDK, by Dave Mark and Jeff LaMarche. I've read about navigation controllers and multiview applications, and now I want to create my own little app, a very simp...
// Declare index in Header.h index=0; - (IBAction)next { index++; // Set imageCount to as many images as are available int imageCount=2; if (index<=imageCount) { NSString* imageName=[NSString stringWithFormat:@"img%i", index]; [picture setImage: [UIImage imageNamed: imageName]]; } } Where do I decl...
Hi, I have this code: - (IBAction)next { static int index = 0; // <-- here index++; // Set imageCount to as many images as are available int imageCount=16; if (index<=imageCount) { NSString* imageName=[NSString stringWithFormat:@"img%i", index]; [picture setImage: [UIImage imageNamed: imageName]]...