Question

So , i have two problems with Xcode . I’m new in the iPhone app development so that any help would be useful . I’m creating an app with a mapView , so first i did everything as it should be . Declaration , view did load , delegates and so on . After that i connected it the property to the map view , and it turned out 28 errors..On the simulator it works , including the map , but on the phone it always breaks . And after that i deleted all the code that’s for the map view, it stayed the same .

Some ideas what could this be ? how to make a map view for iPhone ?

"_OBJC_CLASS_$_NSBundle", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_NSFileManager", referenced from:
      objc-class-ref in AppDelegate.o
  "_objc_msgSendSuper2", referenced from:
      -[AppDelegate dealloc] in AppDelegate.o
      -[MainViewController didReceiveMemoryWarning] in MainViewController.o
      -[MainViewController viewDidLoad] in MainViewController.o
      -[MainViewController viewDidUnload] in MainViewController.o
      -[MainViewController viewWillAppear:] in MainViewController.o
      -[MainViewController viewDidAppear:] in MainViewController.o
      -[MainViewController viewWillDisappear:] in MainViewController.o
      ...
  "_objc_setProperty", referenced from:
      -[AppDelegate setWindow:] in AppDelegate.o
      -[MainViewController setManagedObjectContext:] in MainViewController.o
      -[MainViewController setOdaberiTaxi:] in MainViewController.o
      -[MainViewController setIzbornik:] in MainViewController.o
      -[MainViewController setTaxiPicker:] in MainViewController.o
      -[MainViewController setListaTaxiZG:] in MainViewController.o
      -[MainViewController setToolbar:] in MainViewController.o
      ...
  "__objc_empty_vtable", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
      _OBJC_CLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_CLASS_$_FlipsideViewController in FlipsideViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_OBJC_CLASS_$_UIResponder", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
  "_objc_msgSend", referenced from:
      _main in main.o
      -[AppDelegate dealloc] in AppDelegate.o
      -[AppDelegate application:didFinishLaunchingWithOptions:] in AppDelegate.o
      -[AppDelegate applicationWillTerminate:] in AppDelegate.o
      -[AppDelegate saveContext] in AppDelegate.o
      -[AppDelegate managedObjectContext] in AppDelegate.o
      -[AppDelegate managedObjectModel] in AppDelegate.o
      ...
  "_OBJC_CLASS_$_UIActionSheet", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_UIViewController", referenced from:
      _OBJC_CLASS_$_MainViewController in MainViewController.o
      _OBJC_CLASS_$_FlipsideViewController in FlipsideViewController.o
  "_objc_autoreleasePoolPop", referenced from:
      _main in main.o
  "__objc_empty_cache", referenced from:
      _OBJC_CLASS_$_AppDelegate in AppDelegate.o
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
      _OBJC_CLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_CLASS_$_FlipsideViewController in FlipsideViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_UIApplicationMain", referenced from:
      _main in main.o
  "_OBJC_METACLASS_$_UIResponder", referenced from:
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
  "_OBJC_CLASS_$_UIView", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_UIApplication", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_NSArray", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_CLASS_$_NSManagedObjectContext", referenced from:
      objc-class-ref in AppDelegate.o
  "___CFConstantStringClassReference", referenced from:
      CFString in AppDelegate.o
      CFString in AppDelegate.o
      CFString in AppDelegate.o
      CFString in AppDelegate.o
      CFString in MainViewController.o
      CFString in MainViewController.o
      CFString in MainViewController.o
      ...
  "_OBJC_CLASS_$_UIAlertView", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_METACLASS_$_UIViewController", referenced from:
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_NSSQLiteStoreType", referenced from:
      -[AppDelegate persistentStoreCoordinator] in AppDelegate.o
  "_objc_autoreleasePoolPush", referenced from:
      _main in main.o
  "_NSStringFromClass", referenced from:
      _main in main.o
  "_NSLog", referenced from:
      -[AppDelegate saveContext] in AppDelegate.o
      -[AppDelegate persistentStoreCoordinator] in AppDelegate.o
  "_OBJC_CLASS_$_NSManagedObjectModel", referenced from:
      objc-class-ref in AppDelegate.o
  "_OBJC_CLASS_$_NSURL", referenced from:
      objc-class-ref in MainViewController.o
  "_OBJC_METACLASS_$_NSObject", referenced from:
      _OBJC_METACLASS_$_AppDelegate in AppDelegate.o
      _OBJC_METACLASS_$_MainViewController in MainViewController.o
      _OBJC_METACLASS_$_FlipsideViewController in FlipsideViewController.o
  "_OBJC_CLASS_$_NSPersistentStoreCoordinator", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

You are missing symbols like __objc_msgSend which are fundamental parts of the Objective-C runtime. These symbols are found in libobjc.dylib, which Xcode should link with automatically for any Objective-C project. Furthermore, you’re missing symbols from the Foundation framework (e.g. _OBJC_CLASS_$_NSBundle) and UIKit (e.g. _OBJC_CLASS_$_UIView). These frameworks are automatically included when you create a new Objective-C project in Xcode.

The fact that you are getting these errors indicates that your project is seriously messed up. While it is probably possible for an expert to fix your problem, you probably don’t have an expert around.

So the simplest solution for you is to just create a new project in Xcode and copy your source files over to the new project. And in the new project, be careful not to change or delete build settings unless you understand what they are for. It is easy to accidentally change a build setting, without even realizing it, and start getting inscrutable error messages.

If that doesn’t fix your problem, then it is possible that your Xcode installation is damaged, and you may have to reinstall Xcode.