问题描述
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.
I don't understand why the scrollview isn't working, because I followed advices from tutorials.
我创建了包含 UIImageView 的 UIScrollView 并且还添加了方法
I created the UIScrollView that contains an UIImageView and I also added the method
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return imgv; }
和界面中的UIScrollViewDelegate,但它不起作用.
and the UIScrollViewDelegate in the interface, but it isn't working.
这是 UIScrollView 的代码:
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.
I would be thankful, if someone could figure out what the problem could be.
推荐答案
你需要在你的委托方法中返回 imgv viewForZoomingInScrollView::
You need to return imgv in your delegate method viewForZoomingInScrollView::
- (UIView *) viewForZoomingInScrollView:(UIScrollView *) view { return imgv; }