uiscrollview 的缩放不起作用-尊龙凯时

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;
}