問題描述
我在 Interface Builder 中有一個(gè) UIViewController，我在 UIView 中添加了一個(gè) UIScrollView.它的 contentOffset 屬性等于 0.0，但是當(dāng)我將 UIScrollView 滾動(dòng)到最底部并推送另一個(gè)視圖時(shí)，contentOffset 會(huì)發(fā)生變化.
I have a UIViewController in Interface Builder, and I add a UIScrollView to the UIView. It has a contentOffset property equal to 0.0, but when I scroll the UIScrollView to the very bottom and push another view the contentOffset changes.
NSLog 給了我以下值:
//View just loaded
2013-09-09 16:19:27.455 my_app[24588:907] Scroll View content offset is 0.000000
//We came back from another view
2013-09-09 16:19:30.957 my_app[24588:907] Scroll View content offset is 108.000000
這種行為的原因是什么?我剛剛在 IB 中添加了一個(gè) UIScrollView 并且在代碼中什么也沒做.
What's the reason of this behaviour? I've just added a UIScrollView in IB and did nothing in code at all.
scrollView的contentHeight大于self.view.height.scrollView 的 frame 保持不變.
The contentHeight of the scrollView is bigger than self.view.height. The frame of the scrollView stays the same.
推薦答案
查看我的回答類似的問題.
您需要在 viewWillAppear: 和 viewWillDisappear: 中適當(dāng)?shù)卦O(shè)置滾動(dòng)視圖的 contentOffset.
You need to set the scrollview's contentOffset appropriately in viewWillAppear: and viewWillDisappear:.
另外，請參閱:
- 這個(gè)答案問題UIScrollView 彈回 UIViewController 后原點(diǎn)發(fā)生變化.
- 這個(gè)相關(guān)問題，UIScrollview 自動(dòng)布局問題.
這篇關(guān)于推送另一個(gè)視圖后 UIScrollView contentOffset 更改的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！