UIScrollView不显示滚动指示器 [英] UIScrollView not showing scroll indicator

问题描述

我有一个UIScrollView，我使用...动态创建和大小

  scrollView.contentSize = CGSizeMake .size.width，length）; 
  

然后将 subviews 添加到 UIScrollView 。
我有 scrollView.showsVerticalScrollIndicator = YES;

滚动时滚动指示器从不出现。 / p>

即使我调用 [scrollView flashScrollIndicators] 没有任何反应。

想法？

解决方案

遇到同样的问题，找不到原因。最后一个答案给出了最后的提示：每当我添加新的子视图，我首先从scrollview（和显然也滚动指标）删除所有现有的子视图。

循环，如果子视图真的是我想要删除的滚动指示器显示：

  for（NSObject * subview in [[viewView] [MySubView class]]）{
 [（MySubView *）subview removeFromSuperview]; {
 if（[subview isKindOfClass： 
} 
} 
  

更新：将代码更改为Nikolai的建议

I have a UIScrollView which I create and size dynamically using...

scrollView.contentSize = CGSizeMake(scrollView.frame.size.width , length);

I then add subviews to the UIScrollView. I do have scrollView.showsVerticalScrollIndicator = YES;

When scrolling the scroll indicator never appears.

Even if I call [scrollView flashScrollIndicators] nothing happens.

Ideas?

解决方案

Had the same problem and couldn't find the cause. The last answer gave the final hint: whenever I added new subviews I first removed all existing subviews from the scrollview (and apparently also the scroll indicators).

After checking in my loop, if the subview really was of the kind I wanted to be removed the scroll indicators showed up:

for (NSObject * subview in [[[scrollView subviews] copy] autorelease]) {
    if ([subview isKindOfClass:[MySubView class]]) {
       [(MySubView*)subview removeFromSuperview];
    }
}   

Update: changed code to Nikolai's suggestion

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