Question

我可以滚动图像视图，但是缩放以放大/缩小不起作用。出了什么问题？

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *chosenImage = info[UIImagePickerControllerOriginalImage];

    UIImageView *imageView = [[UIImageView alloc] init];
    [self.scrollView addSubview:imageView];
    imageView.frame = CGRectMake(0, 0, chosenImage.size.width, chosenImage.size.height);

    imageView.image = chosenImage;

    self.scrollView.maximumZoomScale = 4;
    self.scrollView.minimumZoomScale = 0.1;
    self.scrollView.showsVerticalScrollIndicator=YES;
    self.scrollView.delegate = self;
    self.scrollView.scrollEnabled=YES;
    self.scrollView.userInteractionEnabled=YES;

    self.scrollView.contentSize = CGSizeMake(chosenImage.size.width, chosenImage.size.height);

    [picker dismissViewControllerAnimated:YES completion:NULL];
}

Answer 1

首先要确保您的视图已实现正确的委托。例如，在.m文件中

@interface myViewController () <UIGestureRecognizerDelegate, UIScrollViewDelegate>

UIScrollView类可以有一个必须采用UIScrollViewDelegate协议的委托。要使缩放和平移工作，委托必须实现viewForZoomingInScrollView：和scrollViewDidEndZooming：withView：atScale：;此外，最大（maximumZoomScale）和最小（minimumZoomScale）缩放比例必须不同。

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
  return self.fullScreenView;
}




-(void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
    {
    }

缩放缩放在scrollview中不起作用

1 个答案: