通过slider调整图片的大小

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要实现的效果

关键代码

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- (void)sliderAction:(UISlider *)sender {
  sender.value += 0.01;
  CGFloat mumValue = 0.01;
  _currentImage.transform =
      self.upValue > sender.value
          ? CGAffineTransformMakeScale(sender.value - mumValue,
                                       sender.value - mumValue)
          : _currentImage.transform;
  _currentImage.transform =
      self.upValue < sender.value
          ? _currentImage.transform = CGAffineTransformMakeScale(
                sender.value + mumValue, sender.value + mumValue)
          : _currentImage.transform;
  self.upValue = sender.value;
}