ios - Calling method from different UIViewController -

i attempting clear uibezierpath uiview. have class called linearsig has drawing functionality. (from tutorial followed) have following method inside linearsig:

- (void)clearsig {     nslog(@"clear");     path = nil;       incrementalimage = nil;     path = [uibezierpath bezierpath];      [self setneedsdisplay]; } 

when call method sigviewcontroller nslog statements gets called , prints console, path not cleared. if call method within linearsig, lets after touches method, method works perfect. gets erased.

i calling method different view controller because inside custom uialertview.

this how i'm calling method

- (ibaction)clearsig:(id)sender {     self.ls = [[linearsig alloc] init];     [self.ls clearsig]; } 

ls property have declared. idea why not working?

you're creating new instance of linearsig clearing that. need point instance of linearsig you're trying clear graph off of.