Re: change in model not reflected in interface
Re: change in model not reflected in interface
- Subject: Re: change in model not reflected in interface
- From: Edward Hillenbrand <email@hidden>
- Date: Sat, 30 Jul 2005 11:17:11 -0700
On Jul 29, 2005, at 5:25 PM, mmalcolm crawford wrote:
You should change attributes in a key-value observing compliant
manner. Typically this simply means using accessor methods that
follow standard naming conventions
Here is a simplified version of what I'm trying to do:
@interface Model : NSObject {
float foo;
float bar;
}
- (float)foo;
- (void)setFoo:(float)value;
- (float)bar;
- (void)setBar:(float)value;
@end
@implementation Model
- (float)foo { return foo; }
- (void)setFoo:(float)value { foo = value; }
- (float)bar { return bar; }
- (void)setBar:(float)value { bar = value; }
- (void)didChangeValueForKey:(NSString *)key {
if ( [key isEqualToString:@"foo"] ) {
[self setBar:[self foo] * 2]; // this change is not
reflected in the interface???
NSLog(@"%f", [self bar]);
}
}
@end
AFAIK, the object above is KVO complaint. I have an interface with
two text fields, one bound to foo and the other bound to bar. When I
change the value in the text field bound to foo the value in the text
field bound to bar doesn't change.
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