iPhone Exception throw [duplicate] - iphone

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Closed 10 years ago.
Possible Duplicate:
this class is not key value coding-compliant for the key
I am facing this type of problem as when I am creating an application in XCode for iphone .
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x4d2eb20> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key singlePicker.'
*** Call stack at first throw:

Answer 1

you are setting a value for a NULL Key
Edit:
befor you start using the picker you need to:
in the .h file:
UIViewController<UIPickerViewDelegate,UIPickerViewDataSource>{
NSArray *array;
}
then in the .m file:
-(void)viewDidload{
[super viewDidload];
array = [[NSArray alloc]initWithObjects:#"Lake",#"Diana",#"Jone",#"Alice",#"Byber",#"Nuces",nil];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
return [array count];
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
/* do what you want if the picker selected */
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
return [array objectAtIndex:row];
}