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key path blues

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key path blues

Subject: key path blues
From: Dave Sopchak <email@hidden>
Date: Thu, 1 Feb 2007 10:55:38 -0800

Hi all,
	I love KVO until I start using key paths...

I have a top level object, KVC compliant, which is hooked to an NSObjectController in IB. I have some text fields set to the object's values. Everything works fine, I can receive changes made to the text fields and also set the text fields' value by invoking accessor methods from the top object.

I have a KVC compliant object in this top level object and have set key paths in other text fields to values in this object. I can receive changes from the text fields, but changing its values with accessor methods, either from the object itself, or from the top object, doesn't register a change.

Examples:

[self setTempSetpoint:135]; // this sets the bound text fields value and sets the value in the object [[self polCurve] setDwell:3.9]; // this doesn't, but it sets the value in the object [self setValue:[NSNumber numberWithFloat:3.14] forKeyPath:@"polCurve.dwell"]; // this has the same effect as the previous command


any help, much appreciated.

Dave

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