Binding inside a NSTableCellView

Question

I'm using a NSOutlineView view based and i want to bind a NSSlider and a NSTextfield to a NSDictionary key (@""duration"). The dictionary is a property of my NSTableCellView subclass. I'm facing an error when trying to setup the binding :

The error :

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSApplication 0x100506400> addObserver:<NSTextValueBinder 0x102609a90> forKeyPath:@"info.duration" options:0 context:0x10260c820] was sent to an object that is not KVC-compliant for the "info" property.'

.h:

#import <Cocoa/Cocoa.h>

@interface ObjectFileTableCellView : NSTableCellView {
    NSTextField *_textFieldFilePath;
    NSTextField *_textFieldDesription;
    NSButton *_checkBox;
    NSDictionary* _info;

    NSSlider*  _slider;
    NSTextField* _labelStartTime;
}


@property(retain) IBOutlet NSTextField *textFieldFilePath;
@property(retain) IBOutlet NSTextField *textFieldDescription;
@property(retain) IBOutlet NSTextField *labelStartTime;
@property(retain) IBOutlet NSSlider *slider;
@property(retain) IBOutlet NSButton *checkBox;

@property(retain) NSDictionary* info;

@end

.m :

- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item{
    if ([[tableColumn identifier] isEqualToString:@"Files"]) {

        if ([item isKindOfClass:[OMN_Object class]])
        {

//DONE - (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item{ if ([[tableColumn identifier] isEqualToString:@"Files"]) {

    if ([item isKindOfClass:[OMN_Object class]])
    {
        OMN_Object *o = item;

        ObjectFileTableCellView *v = [outlineView makeViewWithIdentifier:@"FileCell" owner:self]; // File'S owner


                hide = NO;
                NSString* d = [o.fileInfoDetails valueForKey:@"duration"];
                [v.slider setMinValue:0];
                [v.slider setMaxValue:[d doubleValue]];

                NSString *val = [NSString stringWithFormat:@"%f", v.slider.doubleValue];
                [v.labelStartTime setStringValue:val];
                [o.fileInfoDetails setValue:val forKey:@"startTime"];
                v.info = o.fileInfoDetails;

    ...

My NSOutlineView view:

NSTableColumn:

NSTextField Binding Setup:

The wanted result :

How to setup the binding to get what i want ?

Answer 1

As Said before, File's Owner.info.duration Make no sense because File's Owner is kind off class outlineview. The dictionary Info is a property off ObjectFileTableCellView.

I bound programmatically the NSTextfield to info.duration and it work great !

Answer 2

You're attempting to bind info.duration to the cell itself, not the text field, assuming that "File's Owner" is indeed your ObjectFileTableCellView.

Use labelStartTime as the controller key when you configure the binding.

Double-check your bindings configuration for the slider as well; you may have made a similar mistake.