Question

The implementation file looks like this:

#import "MovieViewController.h"
#import "Movie.h"
#import "MovieEditorViewController.h"

@implementation MovieViewController

@synthesize titleLabel;
@synthesize boxOfficeGrossLabel;
@synthesize summaryLabel;
@synthesize movie;

but i’m thinking my problem is not adding @synthesize statements for the MovieEditorViewController header file. If it’s not this then I’ve included the debugging log below.

I’m really new to programming and I really can’t seem to figure out whats going wrong. When I run the iOS simulator and click the button to display editable text fields the program terminates and goes back to the homescreen. The debugger shows as follows:

[Session started at 2011-06-04
13:00:00 +0100.] 2011-06-04
13:00:05.568 Movie[6678:207]
-[MovieViewController editingViewController]: unrecognized
selector sent to instance 0x8a3bd10
2011-06-04 13:00:05.572
Movie[6678:207] * Terminating app
due to uncaught exception
‘NSInvalidArgumentException’, reason:
‘-[MovieViewController
editingViewController]: unrecognized
selector sent to instance 0x8a3bd10’
* Call stack at first throw: ( 0 CoreFoundation
0x00dc95a9 exceptionPreprocess + 185
1 libobjc.A.dylib
0x00f1d313 objc_exception_throw + 44
2 CoreFoundation
0x00dcb0bb -[NSObject(NSObject)
doesNotRecognizeSelector:] + 187 3
CoreFoundation
0x00d3a966 __forwarding + 966 4
CoreFoundation
0x00d3a522 _CF_forwarding_prep_0 + 50
5 Movie
0x000021b4 -[MovieViewController edit]
+ 62 6 UIKit 0x002b94fd -[UIApplication
sendAction:to:from:forEvent:] + 119 7
UIKit
0x00349799 -[UIControl
sendAction:to:forEvent:] + 67 8
UIKit
0x0034bc2b -[UIControl(Internal)
_sendActionsForEvents:withEvent:] + 527 9 UIKit
0x0034a7d8 -[UIControl
touchesEnded:withEvent:] + 458 10
UIKit
0x002ddded -[UIWindow
_sendTouchesForEvent:] + 567 11 UIKit
0x002bec37 -[UIApplication sendEvent:]
+ 447 12 UIKit 0x002c3f2e _UIApplicationHandleEvent +
7576 13 GraphicsServices
0x01721992 PurpleEventCallback + 1550
14 CoreFoundation
0x00daa944
CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION
+ 52 15 CoreFoundation 0x00d0acf7 __CFRunLoopDoSource1 + 215
16 CoreFoundation
0x00d07f83 __CFRunLoopRun + 979 17
CoreFoundation
0x00d07840 CFRunLoopRunSpecific + 208
18 CoreFoundation
0x00d07761 CFRunLoopRunInMode + 97 19
GraphicsServices
0x017201c4 GSEventRunModal + 217 20
GraphicsServices
0x01720289 GSEventRun + 115 21 UIKit
0x002c7c93 UIApplicationMain + 1160
22 Movie
0x00001b40 main + 102 23 Movie
0x00001ad1 start + 53 24 ???
0x00000001 0x0 + 1 ) terminate called
after throwing an instance of
‘NSException’

If anyone could point me in the right direction i’d be very grateful…

Thanks!

Answer 1

Looks like you’re in the iPhone SDK Development book. Have you made it to section 4.8 yet? The error says that your MovieViewController doesn’t have a property named editingViewController, which is something you add in 4.8. The project won’t build and run until you get through section 4.9, which is where you make some connections.