storyboard:This class is not key value coding-compliant for the key -


i use storyboard layouts.the process this：

a[uiviewcontroller] ----modal--->[uinavigationcontroller]-----root view controller----->b[uiviewcontroller]

and need value b；so wrote following code in a：

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {      [segue.destinationviewcontroller setvalue:@"test" forkey:@"type"];  }

but @ time of execution, appear [* terminating app due uncaught exception 'nsunknownkeyexception', reason: '[ setvalue:forundefinedkey:]: class not key value coding-compliant key type.']

can seen value arrived uinavigationcontroller. how pass parameters uinavigationcontroller root view[b]?

- (void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     uinavigationcontroller * nav = segue.destinationviewcontroller;     [[nav.viewcontrollers objectatindex:0] setvalue:@"test" forkey:@"type"]; }

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