How can I pass values from obj-C to a quartz composer view?

In a .xib for an application I'm working on, I have a quartz composer viewer object (QCView) in the window. I also have a patch controller (QCPatchController). The patch controller has its own class files in xCode, but they aren't doing anything right now. Following the apple docs, I was able to bind some values within the .nib file so if I edited a text field, it would pass this value to a published input on the QC document. Unfortunately, these docs say nothing abo开发者_Go百科ut how to pass values programatically. How can I pass values (in code) to a QC patch?

Thanks in advance!

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You should be able to use -setValue:forKeyPath:. For example:

[patchController setValue:@"foo" forKeyPath:@"patch.stringinput.value"];