objective c - How do I make iPhone vibrate? -

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i using code buy getting compile errors audio line. know why?

- (void)handletimer:(nstimer *)timer  {     self.counter--;     self.timerlabel.text = [nsstring stringwithformat:@"%ld", self.counter];     if (self.counter == 0)     {         audioservicesplaysystemsound(ksystemsoundid_vibrate);     } }

you forgot import framework 

#import <audiotoolbox/audiotoolbox.h>

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