position

css 居中 方法1：table-cell html结构： <div class="box box1"> <span>垂直居中</span> </div> css： .box1{ display: table-cell; vertical-align: middle; text-align: center; } 方法2：display:flex .box2{ display: flex; justify-content:center; align-items:Center; } 方法3：绝对定位和负边距 .box3{position:relative;} .box3 span{ position: absolute; width:100px; height: 50px; top:50%; left:50%; margin-left:-50px; margin-top:-25px; text-align: center; } 方法4：绝对定位和0 .box4 span{ width: 50%; height: 50%; background: #000; overflow: auto; margin: auto; position: absolute; top: 0; left: 0; bottom: 0; right: 0; } 这种方法跟上面的有些类似，但是这里是通过margin

It seems that with position:absolute in use an element cannot be centred using justifyContent or alignItems . There's a workaround to use marginLeft but does not display the same for all devices even using dimensions to detect height and width of device. bottom: { position: 'absolute', justifyContent: 'center', alignItems: 'center', top: height*0.93, marginLeft: width*0.18, }, bottomNav: { flexDirection: 'row', }, Stephen Horvath Wrap the child you want centered in a View and make the View absolute. <View style={{position: 'absolute', top: 0, left: 0, right: 0, bottom: 0, justifyContent:

ヽ(●´ω｀●)ﾉ styled-components: const ControlCenter = styled.img` position: absolute; left: 50%; top: 50%; margin-left: -20px; margin-top: -20px; width: 40px; height: 40px; `; JSX: <div style={{position:'relative'}}> <video /> <ControlCenter src={ImgPlay} /> </div> 效果: ヽ(●´ω｀●)ﾉ 来源： https://www.cnblogs.com/su0tiuqibu/p/11751216.html

效果图： 代码如下： <div class="row" style="width:100%; position:relative;z-index:1;margin:0 auto; background: #000;"> <img src="~/images/touxiang.jpg" style="width:100%; opacity:0.6; filter: alpha(opacity=60);"/> <div style="width:100%;position:absolute;z-index:2;top:50%; text-align:center;"> <h2 style="color:#fff">文字浮动在图片上方</h2> </div> </div> 来源： https://www.cnblogs.com/yechangzhong-826217795/p/11751192.html

I am trying to create a very simple effect where the navigation sticks to the top of the page as you scroll down the page. All I should have to do is set "position: fixed" to the header, which I currently have. For some reason, it's treating it more like a "position: absolute" element vs. fixed. I tried it on other elements on the page with the same effect, so I must have something that in my HTML or CSS code that is causing the issue. Any ideas? http://jsfiddle.net/apautler/yDhXG/1/embedded/result/ Header CSS .nav-main {overflow: visible; position: fixed; top: 0; left: 0; right: 0; height:

2019独角兽企业重金招聘Python工程师标准>>> 如果LayoutManager用的是LinearLayoutManager，强烈推荐下面的方法获取滑动距离 private int getScollYDistance() { LinearLayoutManager layoutManager = (LinearLayoutManager) mRecylerview.getLayoutManager(); int position = layoutManager.findFirstVisibleItemPosition(); View firstVisiableChildView = layoutManager.findViewByPosition(position); int itemHeight = firstVisiableChildView.getHeight(); return (position) * itemHeight - firstVisiableChildView.getTop(); } 转载于:https://my.oschina.net/u/1177694/blog/740455 来源： CSDN 作者： weixin_33989780 链接： https://blog.csdn.net/weixin_33989780/article/details

项目里有一个功能是根据RecyclerView的滑动距离来刷新一些组件的UI，搜了一下常用的方法，记录一个比较靠谱的办法： public int getScollYDistance() { LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager(); int position = layoutManager.findFirstVisibleItemPosition(); View firstVisiableChildView = layoutManager.findViewByPosition(position); int itemHeight = firstVisiableChildView.getHeight(); return (position) * itemHeight - firstVisiableChildView.getTop(); } 这个方法使用position * 该position的view高度 来计算已经滑动的距离，其实是默认了每个被划过的item view的高度是一致的，有点偷懒之嫌，不过假如我们项目中每个item View的高度确实一致的，直接这么使用也无妨，在每个item view 高度不一致的情况下

I'm kind of new to positioning divs how I want them in a website, so I hope someone can help here. What I'm trying to get is a sandwich-type set up with a scrolling content in the middle of two divs. Such that I have a header div and a footer div, both of which have to stay static on the page. Then, between them, I have to have a content div that fills the space between the two fixed divs and have the ability to scroll on it's own. How would I go about building something simple like this? Or is this not simple at all? Update: I created a fiddle that I think is ALMOST what I want. I have the

1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Title</title> 6 </head> 7 8 <style> 9 *{ 10 margin: 0; 11 padding: 0; 12 } 13 .main{ 14 width:300px; 15 height:400px; 16 position: relative; 17 top:0; 18 left:0; 19 background-color: antiquewhite; 20 } 21 .center{ 22 position: absolute; 23 width:100px; 24 height:100px; 25 top:50%; 26 left:50%; 27 background-color: red; 28 transform: translate(-50%,-50%); 29 } 30 31 </style> 32 <body> 33 34 35 <div class="main"> 36 <div class="center"> 37 </div> 38 </div> 39 </body> 40 </html> 效果： 第二种：flex布局垂直居中 1 <!DOCTYPE html> 2