0

我不明白为什么滚动视图不起作用,因为我遵循了教程中的建议。

我创建了UIScrollView包含一个UIImageView并且我还添加了方法

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

UIScrollViewDelegate在界面中,但它不起作用。

这是代码UIScrollView

 imgv = [[UIImageView alloc]
                     initWithFrame:CGRectMake(0, 0, 1000, 500)];
 imgv.image = [UIImage imageWithData:retrievedData];

 scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 800, 800)];
 scrollView setContentSize:CGSizeMake(imgv.image.size.width, imgv.image.size.height)];
 scrollView.maximumZoomScale = 4;
 scrollView.minimumZoomScale = 1;
 [scrollView setScrollEnabled:YES];
 scrollView.clipsToBounds = YES;
 scrollView.delegate = self;

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(hideImageView)];

 [scrollView addSubview:imgv];
 [view addSubview:scrollView];

如果有人能找出问题所在,我将不胜感激。

4

3 回答 3

1

您需要imgv在委托方法viewForZoomingInScrollView:中返回:

- (UIView *) viewForZoomingInScrollView:(UIScrollView *) view {
    return imgv;
}
于 2012-11-26T15:28:49.503 回答
0

我相信您忘记正确设置 imageView 的框架

self.imageView.frame=CGRectMake(0, 0, self.imageView.image.size.width, self.imageView.image.size.height);
于 2012-11-27T01:36:04.720 回答
0

您必须将 imageView 作为子视图添加到滚动视图

[scrollView addSubview:imgv];
于 2012-11-26T15:33:00.393 回答