放大缩小动画

transform.m

  [UIView animateWithDuration:0.1
                   animations:^{
                     self.testView.transform = CGAffineTransformMakeScale(1.2,1.2);
                   }
                   completion:^(BOOL finished) {
                     [UIView animateWithDuration:0.05
                                      animations:^{
                                        self.testView.transform = CGAffineTransformMakeScale(0.9,.9);
                                      } 
                                      completion:^(BOOL finished) {
                                        [UIView animateWithDuration:0.05
                                                         animations:^{
                                                           self.testView.transform = CGAffineTransformMakeScale(1.0,1.0);
                                                         }];
                                      }];
                   }];