I have an application that contains a NSTableView of Card data types.
The NSTableView gets its data from an NSArray of Card instances.
I want to allow the user to be able to filter the view based on the
Card fields. I know I need to use a NSPredicateEditor to present the
UI for the user, and to create the NSPredicate instances. However, I
cannot wrap my head around how this works, and cannot get a simple
example working (with a single rule). I have spent the last two days
reading up on it, and it is just not clicking for me.
So, does anyone have a very simple example of how to use
NSPredicateEditor programmatically?
I want to be able to allow the user to potentially filter on multiple
fields, but would be happy if I can get a single field to work right
now.
Here is the current predicate I am using with a NSSearchField:
NSPredicate *namePredicate = [NSPredicate
predicateWithFormat:@"cardName contains[c] %@", searchString];
[filteredCards filterUsingPredicate:namePredicate];
Card has a property (NSString) named "cardName".
I have tried to programmatically add a NSPredicateEditorRowTemplate,
but when I do this, nothing shows up in the editor at runtime.
NSPredicateEditorRowTemplate *template = [[NSPredicateEditorRowTemplate alloc]
initWithLeftExpressions:[NSArray arrayWithObjects:[NSExpression
expressionForKeyPath:@"cardName"], nil]
rightExpressions:[NSArray arrayWithObjects:[NSExpression
expressionForConstantValue:@"Foo"], nil]
modifier:NSDirectPredicateModifier
operators:[NSArray arrayWithObject:[NSNumber
numberWithInt:NSContainsPredicateOperatorType]]
options:NSCaseInsensitivePredicateOption
];
predicateEditor.rowTemplates = [NSArray arrayWithObject:template];
I am really stumped on this one, and would appreciate it if someone
could help nudge me in the right direction. Does anyone have a simple
example of how to construct NSPredicateEditorRowTemplate that will
create a filter like so:
cardName contains USER_INPUT
I think if I can get that working, then it will put me over the hump
and I can figure out the rest.
mike
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