问题描述
我正在调整详细视图控制器的状态,就在它被推到 navigationController
之前:
I am adjusting a detail view controller's state, just before it is pushed on a navigationController
:
[self.detailViewController detailsForObject:someObject];
[self.navigationController pushViewController:self.detailViewController
animated:YES];
在 DetailViewController
中,scrollView驻留。我根据传递的对象调整了哪些内容:
In the DetailViewController
a scrollView resides. Which content I resize based on the passed object:
- (void)detailsForObject:(id)someObject {
// set some textView's content here
self.contentView.frame = <rect with new calculated size>;
self.scrollView.contentSize = self.contentView.frame.size;
self.scrollView.contentOffset = CGPointZero;
}
现在,这一切都有效,但scrollView会调整它的 contentOffset 。 contentOffset
将设置为最后一个contentSize与新计算的一个之间的差异。这意味着第二次打开detailsView时,详细信息将滚动到某个不需要的位置。即使我明确地将 contentOffset
设置为 CGPointZero
。
Now, this all works, but the scrollView adjusts it's contentOffset
during the navigationController's slide-in animation. The contentOffset
will be set to the difference between the last contentSize and the new calculated one. This means that the second time you open the detailsView, the details will scroll to some unwanted location. Even though I'm setting the contentOffset
to CGPointZero
explicitly.
我发现重置中的
无效。我能想到的最好的方法是重置 contentOffset
- viewWillAppear viewDidAppear
中的contentOffset,导致内容显着上下移动:
I found that resetting the contentOffset
in - viewWillAppear
has no effect. The best I could come up with is resetting the contentOffset in viewDidAppear
, causing a noticeable up and down movement of the content:
- (void)viewDidAppear:(BOOL)animated {
self.scrollView.contentOffset = CGPointZero;
}
有没有办法阻止 UIScrollView
在 contentSize
更改后调整 contentOffset
?
Is there a way to prevent a UIScrollView
from adjusting its contentOffset
when its contentSize
is changed?
推荐答案
在推送包含 UIScrollView
的 UIViewController
时发生使用 UINavigationController
。
Occurs when pushing a UIViewController
containing a UIScrollView
using a UINavigationController
.
iOS 7
解决方案1(代码)
设置到否
。
解决方案2(故事板)
取消选中调整滚动视图插入
iOS 6
解决方案(代码)
设置 UIScrollView
的属性 contentOffset
和 contentInset
在 viewWillLayoutSubviews
中。示例代码:
Set the UIScrollView
's property contentOffset
and contentInset
in viewWillLayoutSubviews
. Sample code:
- (void)viewWillLayoutSubviews{
[super viewWillLayoutSubviews];
self.scrollView.contentOffset = CGPointZero;
self.scrollView.contentInset = UIEdgeInsetsZero;
}
这篇关于当contentSize更改时,UIScrollView会调整contentOffset的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!