Question

I have create a demo project in which i have add button. On button action i am calling a custom view. On that custom view i have add a picker view, a toolbar and bar button. On action of button i am calling that custom view. I have used this code…

-(IBAction)Picker{

mpv_object  = [[MyPickerView alloc] initWithNibName:@"MyPickerView" bundle:nil];
[self.view addSubview:mpv_object];
[mpv_object release];

}

But i give error which i given below…

2011-09-26 09:49:00.236 Web[440:207] -[MyPickerView initWithNibName:bundle:]: unrecognized selector sent to instance 0x4b4dcb0
2011-09-26 09:49:00.287 Web[440:207] * Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[MyPickerView initWithNibName:bundle:]: unrecognized selector sent to instance 0x4b4dcb0’
* Call stack at first throw:
(
0 CoreFoundation 0x00daebe9 exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f035c2 objc_exception_throw + 47
2 CoreFoundation 0x00db06fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00d20366 __forwarding + 966
4 CoreFoundation 0x00d1ff22 _CF_forwarding_prep_0 + 50
5 Web 0x0000223a -[WebViewController Picker] + 102
6 UIKit 0x002b7a6e -[UIApplication sendAction:to:from:forEvent:] + 119
7 UIKit 0x003461b5 -[UIControl sendAction:to:forEvent:] + 67
8 UIKit 0x00348647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
9 UIKit 0x003471f4 -[UIControl touchesEnded:withEvent:] + 458
10 UIKit 0x002dc0d1 -[UIWindow _sendTouchesForEvent:] + 567
11 UIKit 0x002bd37a -[UIApplication sendEvent:] + 447
12 UIKit 0x002c2732 _UIApplicationHandleEvent + 7576
13 GraphicsServices 0x016e4a36 PurpleEventCallback + 1550
14 CoreFoundation 0x00d90064 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION + 52
15 CoreFoundation 0x00cf06f7 __CFRunLoopDoSource1 + 215
16 CoreFoundation 0x00ced983 __CFRunLoopRun + 979
17 CoreFoundation 0x00ced240 CFRunLoopRunSpecific + 208
18 CoreFoundation 0x00ced161 CFRunLoopRunInMode + 97
19 GraphicsServices 0x016e3268 GSEventRunModal + 217
20 GraphicsServices 0x016e332d GSEventRun + 115
21 UIKit 0x002c642e UIApplicationMain + 1160
22 Web 0x00001f80 main + 102
23 Web 0x00001f11 start + 53
)
terminate called after throwing an instance of ‘NSException’
What is error in this?

Answer 1

It sounds like MyPickerView is a UIView subclass. initWithNibName:bundle is not a method that exists on UIView subclasses. It is a method that exists on UIViewController subclasses. That is what the error message means.