I'm sure what I'm trying to do is not that difficult but I've been pulling my
hair out for a while now on this problem.
I have an application whose model could be updated without the user directly
doing anything. So bindings seems like the perfect fit b/c the interface will
reflect these sorts of changes when they occur. But I can't seem to get
updates in my model to appear in the interface. My model is an NSMutableSet
that contains NSMutableDictionaries. I then have a NSTableView with several
columns. I want each column in the table to display a value from each
NSMutableDictionary.
@interface MyController : NSObject
{
NSMutableSet *myset;
}
//I initialize the NSMutableSet in this method.
- (void)awakeFromNib;
//Setter and Getter to ensure KVC compliance.
- (void)setMyset:(NSMutableSet *)set;
- (NSMutableSet *)myset;
//This method is here for testing. A button in the UI is connected to the
method.
//When executed this method creates a new NSMutableDictionary. Adds some
key/value
//pairs to it then adds the NSMutableDictionary to the NSMutableSet (myset).
- (IBAction)addValueToSet:(id)sender;
In Interface Builder I have dragged out an NSObject and set its type to be
"MyController". I then dragged out an NSObjectController and set its "Content"
connection to the MyController object. I then dragged out an NSArrayController
and bound its Content Array binding to the Object Controller with a Controller
Key of "selection" and a Model Key Path of "myset". I also set the
NSArrayController's Class Name to NSMutableDictionary since that is what is
held by my NSMutableSet. I setup a NSTableView in my application's window and
then bound its first table column's "Value" binding to the NSArrayController
using "arrangedObjects" as the Controller Key and "Caption" as the Model Key
Path. "Caption" is the key to a key/value pair in the NSMutableDictionary that
is held by the NSMutableSet (myset).
In the addValueToSet: method I have the following code:
- (IBAction)addValueToSet:(id)sender
{
NSString *newString = @"New Value";
NSMutableDictionary *dict = [[[NSMutableDictionary alloc]
initWithCapacity:1] autorelease];
[dict setValue:newString forKey:@"Caption"];
[myset addObject:dict];
}
When I click the button in my interface nothing happens. I know the
addValueToSet: method is being called however I would expect the interface to
update based upon my updating the model. Can anybody tell me what I'm doing
wrong?
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