Hi,
correct me if I'm wrong, but what you're doing is a calculation with
the pointers ( * of NSNumber) not the values. You have to calculate it
like this:
NSInteger fieldOne = [ [ managedObject valueForKey:@"key1"]
intValue]; // if it's an integer
NSInteger fieldTwo = [ [ managedObject valueForKey:@"key2"] intValue];
NSInteger fieldThree = [ [ managedObject valueForKey:@"key3"]
intValue];
if ( fieldTwo > 0 )
{
NSNumber *answer = [ NSNumber numberWithInt:fieldTwo - fieldOne +
fieldThree];
[ self.managedObject setValue:answer forKey:@"key4"];
// maybe you need to this instead
[ self.managedObject setValue:[ answer stringValue] forKey:@"key4"];
}
Don't know if intValue in this context works, if not then use this
alternative, which must work in any way:
Your code and change the following lines:
NSNumber *answer = [ NSNumber numberWithInt: [fieldTwo intValue] -
[fieldOne intValue] + [fieldThree intValue] ];
[ self.managedObject setValue:answer forKey:@"key4"];
//or
[ self.managedObject setValue:[ answer stringValue] forKey:@"key4"];
//stringValue to present it in a textfield
Hope that helped... MacMeideln
Am 22.04.2010 um 17:36 schrieb Arnold Nefkens:
Hello list,
Im quite new, and probably missing something.
I want to do a calculation of three fields inside of a entity in
CoreData.
Below is the code, what is wrong?
NSNumber *fieldOne = [managedObject valueForKey:@"key1"];
NSNumber *fieldTwo = [managedObject valueForKey:@"key2"];
NSNumber *fieldThree = [managedObject valueForKey:@"key3"];
if (fieldTwo > 0) {
NSNumber *answer = ((fieldTwo - fieldOne) + fieldThree);
[self.managedObject setValue:[answer intValue] forKey:@"key4"];
}
If I debug the right values are being shown in the fieldOne,
fieldTwo and fieldThree. But the calculation answer is all the time
out of scope.....
What am I missing?
hope someone can help...
Arnold Nefkens_______________________________________________
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