UIView+AlertPulse

-(void)alertPulse {
  // ios7+-style UIAlertView drop-and-bounce. if starting hidden, fade in from quite big & fade in until completion,
  //  otherwise pulse up then back with default ease-in/-out to look springy, no fading
  BOOL wasHidden = NO;
  if (self.hidden == YES) {
    wasHidden = YES;
    self.alpha = 0.0;
    self.transform = CGAffineTransformMakeScale(1.5, 1.5);
  }
  self.hidden = NO;
  [UIView animateWithDuration:0.2
                   animations:^{
                     self.transform = CGAffineTransformMakeScale(1.05, 1.05);
                     if (wasHidden) { self.alpha = 0.8; }
                   }
                   completion:^(BOOL finished) {
                     [UIView animateWithDuration:1/7.5
                                      animations:^{
                                        self.transform = CGAffineTransformIdentity;
                                        self.alpha = 1.0;
                                      }];
                   }];

#if 0
  // pre-ios7-style UIAlertView grow-and-bounce. if starting hidden, fade in from quite small & fade in until completion,
  //  otherwise pulse up then back with default ease-in/-out to look springy, no fading
  if (self.hidden == YES) {
    wasHidden = YES;
    self.alpha = 0.0;
    self.transform = CGAffineTransformMakeScale(0.6, 0.6);
  }
  self.hidden = NO;
  [UIView animateWithDuration:0.2
                   animations:^{
                     self.transform = CGAffineTransformMakeScale(1.05, 1.05);
                     if (wasHidden) { self.alpha = 0.8; }
                   }
                   completion:^(BOOL finished){
                     [UIView animateWithDuration:1/15.0
                                      animations:^{
                                        self.transform = CGAffineTransformMakeScale(0.9, 0.9);
                                        if (wasHidden) { self.alpha = 0.9; }
                                      }
                                      completion:^(BOOL finished) {
                                        [UIView animateWithDuration:1/7.5
                                                         animations:^{
                                                           self.transform = CGAffineTransformIdentity;                                                                                             self.alpha = 1.0;
                                                         }
                                         ];
                                      }
                      ];
                   }
   ];
#endif
}