UIView-animateKeyframesWithDuration-example.m

[UIView animateKeyframesWithDuration:5.0 delay:0.0 options:0 animations:^{        
        [UIView addKeyframeWithRelativeStartTime:0.0 relativeDuration:0.5 animations:^{
            self.verticalPosition.constant = 200.0;
            [self.view layoutIfNeeded];
        }];
        [UIView addKeyframeWithRelativeStartTime:0.5 relativeDuration:0.25 animations:^{
            self.verticalPosition.constant = 50.0;
            [self.view layoutIfNeeded];
        }];
        [UIView addKeyframeWithRelativeStartTime:0.75 relativeDuration:0.125 animations:^{
            self.verticalPosition.constant = 200.0;
            [self.view layoutIfNeeded];
        }];
        [UIView addKeyframeWithRelativeStartTime:0.875 relativeDuration:0.0625 animations:^{
            self.verticalPosition.constant = 50.0;
            [self.view layoutIfNeeded];
        }];
        [UIView addKeyframeWithRelativeStartTime:0.9375 relativeDuration:0.03125 animations:^{
            self.verticalPosition.constant = 200.0;
            [self.view layoutIfNeeded];
        }];
        [UIView addKeyframeWithRelativeStartTime:0.96875 relativeDuration:0.015625 animations:^{
            self.verticalPosition.constant = 50.0;
            [self.view layoutIfNeeded];
        }];
    } completion:nil];