iphone - 如何使用滑块值更改放大缩小 UIimageView

Question

我有一个图像视图

我可以使用以下代码用两根手指放大和缩小图像

{
[super viewDidload]
 imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320 ,420)];      
      [imageScrollView addSubview:imgView];

      // imageScrollView.minimumZoomScale=0.75;
      imageScrollView.maximumZoomScale=6.0;

      imageScrollView.zoomScale = 0.29;
      imageScrollView.delegate=self;
      [self.view addSubview:imageScrollView];
}


 //UIScrollViewDelegate methods for Zoom

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
      return imgView;
}



- (CGRect)zoomRectForScrollView:(UIScrollView *)ImgscrollView withScale:(float)scale withCenter:(CGPoint)center 
{
      CGRect zoomRect;
      zoomRect.size.height = ImgscrollView.frame.size.height / scale;
      zoomRect.size.width  = ImgscrollView.frame.size.width  / scale;
      // choose an origin so as to get the right center.
      zoomRect.origin.x = center.x - (zoomRect.size.width  / 2.0);
      zoomRect.origin.y = center.y - (zoomRect.size.height / 2.0);
      return zoomRect;
}

但我的要求是使用滑动值而不是两指缩放来增加或减少缩放级别。

 - (IBAction) sliderValueChange:(UISlider *)sender
 {
     //--- ???????
  }

通过更改滑块值来增加图像增加的缩放级别，并通过减小滑块值来降低缩放级别

Answer 1

通过使用解决了我的问题

[imageScrollView setZoomScale:sender.value];

更改滑块时更新缩放。