iphone - UIScrollView 不响应 setZoomScale :

Question

我做错了什么？这是我如何创建+填充我的scrollView

    -(void)viewDidAppear:(BOOL)animated {

    UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bigimage.jpg"]];
    imgView.contentMode = UIViewContentModeScaleAspectFit;

    scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];
    scrollView.contentSize = imgView.frame.size;

    scrollView.minimumZoomScale =  scrollView.frame.size.width / scrollView.contentSize.width * 0.99;
    scrollView.maximumZoomScale =  2;

    [self.view addSubview:scrollView];


[scrollView addSubview:imgView];

    [scrollView setZoomScale:0.5 animated:YES];
    NSLog(@"current zoomScale: %f", scrollView.zoomScale);
    [imgView release];
}

NSLogged ZoomScale为1.0，图像以全尺寸清晰显示。双指缩放没有任何作用。我几乎尝试了网上能找到的所有方法，但似乎每个人都在这样做，而且这对他们有用。

非常感谢您的帮助!

Answer 1

UIScrollView 不会缩放，除非将其 delegate 属性设置为响应的有效 UIScrollViewDelegate

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;

查看   the documentation 。