Hi,
I have a NSSecureTextField combined with bindings I need to filter for
"allowed" formats like ['0'-'9']* or ['0'-'9''a'-'f']*.
The filter is set up like below and according to the NSLog working fine.
According to the documentation "Bindings Message Flow", the following
should occur:
[12] The validation result, value, and a possible error are returned
by the controller’s validateValue:forKeyPath:error:method to the view.
[13] If the validation result is YES, then the valid or coerced value
are returned to Step 5, otherwise proceed to Step 14.
[5] The view object invokes setValue:forKeyPath: on the controller
object, passing the new, possibly transformed, object value and the
binding’s key path as arguments.
However, when e.g. "12xxx" is coerced to "12", in the TextField still
five bullets remain and entering another digit invokes the method with
"12xxx1". How can I force the documented behavior?
- (BOOL) validateValue:(id *) ioValue forKey:(NSString *) anKey error:
(NSError **)outError
{
if( [anKey isEqualTo:@"myKey"] )
{
NSString *value = *ioValue;
unichar *buffer = (unichar *) malloc( [value length] *
sizeof( unichar) );
unichar *dest = buffer;
for( NSInteger i = 0; i < [value length]; ++i )
{
if( [oValidator inputMethodAllowsCharacter:[value
characterAtIndex:i]] )
{
*dest = [value characterAtIndex:i];
++dest;
}
}
NSUInteger len = (dest - buffer);
NSString *coercedValue = [NSString stringWithCharacters:buffer
length:len];
free( buffer );
*ioValue = coercedValue;
NSLog( @"%s %...@->%@", __PRETTY_FUNCTION__, value,
coercedValue );
return (coercedValue != nil);
}
return YES;
}
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