* The children of a row-flexbox container automatically fill the container&#39;s vertical space. 

* Specify `flex: 1;` for a child if you want it to fill the remaining horizontal space: 

&lt;!-- begin snippet: js hide: false console: false babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .wrapper {
      display: flex;
      flex-direction: row;
      align-items: stretch;
      width: 100%;
      height: 5em;
      background: #ccc;
    }

    .wrapper&gt;.left {
      background: #fcc;
    }

    .wrapper&gt;.right {
      background: #ccf;
      flex: 1;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;wrapper&quot;&gt;
      &lt;div class=&quot;left&quot;&gt;Left&lt;/div&gt;
      &lt;div class=&quot;right&quot;&gt;Right&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;



* Specify `flex: 1;` for both children if you want them to fill equal amounts of the horizontal space: 

&lt;!-- begin snippet: js hide: false console: false babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .wrapper {
      display: flex;
      flex-direction: row;
      align-items: stretch;
      width: 100%;
      height: 5em;
      background: #ccc;
    }

    .wrapper&gt;div {
      flex: 1;
    }

    .wrapper&gt;.left {
      background: #fcc;
    }

    .wrapper&gt;.right {
      background: #ccf;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;wrapper&quot;&gt;
      &lt;div class=&quot;left&quot;&gt;Left&lt;/div&gt;
      &lt;div class=&quot;right&quot;&gt;Right&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;



Is it possible to get the size (width and height) of a certain view? For example, I have a view showing the progress:

    &lt;View ref=&#39;progressBar&#39; style={{backgroundColor:&#39;red&#39;,flex:this.state.progress}} /&gt; 

I need to know the actual width of the view to align other views properly. Is this possible?


Get size of a View in React Native

I am starting to learn Swift, and have been following the very good Stanford University video lectures on YouTube. Here is a link if you are interested or it helps (although it isn&#39;t required to understand my problem):

[Developing iOS 8 Apps with Swift - 2. More Xcode and Swift, MVC](https://itunes.apple.com/ca/course/2.-more-xcode-and-swift-mvc/id961180099?i=333886879&amp;mt=2)

While following the lectures I got to a point where (as far as I could tell) my code was identical to the code in the video but on my system I got a compiler error. After a lot of trial and error I have managed to reduce my code to two examples, one of which generates an error, the other or which doesn&#39;t, but I have no idea what is actually causing the error or how to resolve it.

The code which creates the error is:

    import UIKit
    
    class BugViewController: UIViewController
    {
        func perform(operation: (Double) -&gt; Double) {
        }
    
        func perform(operation: (Double, Double) -&gt; Double) {
        }
    }

This creates the following compiler error:

&gt;Method &#39;perform&#39; with Objective-C selector &#39;perform: &#39; conflicts with previous declaration with the same Objective-C selector

By simply removing the sub-classing of UIViewController the code compiles:

    import UIKit
    
    class BugViewController
    {
        func perform(operation: (Double) -&gt; Double) {
        }
    
        func perform(operation: (Double, Double) -&gt; Double) {
        }
    }

Some other information which may or may not be relevant:

- I have recently upgraded to Yosemite.
- When I installed Xcode, I ended up with a Beta version (Version 6.3 (6D543q)) because (if I remember correctly) this was the version I needed to run on my version of OS X.

I am half hoping this is a bug in the compiler because otherwise this doesn&#39;t make any sense to me. Any help very gratefully received!

Compiler error: Method with Objective-C selector conflicts with previous declaration with the same Objective-C selector

I have a left-right flexbox:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;wrapper&quot;&gt;
      &lt;div class=&quot;left&quot;&gt;Left&lt;/div&gt;
      &lt;div class=&quot;right&quot;&gt;Right&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- language: lang-css --&gt;

    .wrapper {
      display: flex;
      flex-direction: row;
      align-items: stretch;
      width: 100%;
      height: 70vh;
      min-height: 325px; 
      max-height:570px; 
    }

&lt;!-- end snippet --&gt;

The problem is that the right child is not behaving responsively. To be specific, I want it to fill the height of the wrapper.

How to accomplish this?

How to stretch children to fill cross-axis?

I have a left-right flexbox:


<pre><code class="hljs language-css">&#x3C;div class="wrapper">
 &#x3C;div class="left">Left&#x3C;/div>
 &#x3C;div class="right">Right&#x3C;/div>
&#x3C;/div>
</code></pre>

<pre><code class="hljs language-css">.wrapper {
 display: flex;
 flex-direction: row;
 align-items: stretch;
 width: 100%;
 height: 70vh;
 min-height: 325px; 
 max-height:570px; 
}
</code></pre>

The problem is that the right child is not behaving responsively. To be specific, I want it to fill the height of the wrapper.
How to accomplish this?

I want to use flexbox that has some number of items that are all the same width. I&#39;ve noticed that flexbox distributes the space around evenly, rather than the space itself.

For example:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    .header {
      display: flex;
    }

    .item {
      flex-grow: 1;
      text-align: center;
      border: 1px solid black;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;header&quot;&gt;
      &lt;div class=&quot;item&quot;&gt;asdfasdfasdfasdfasdfasdf&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;z&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;

The first item is a lot bigger than the second. If I have 3 items, 4 items, or n items, I want them all to appear on the same line with an equal amount of space per item.

Any ideas?

http://codepen.io/anon/pen/gbJBqM


How to make flexbox items the same size?

Is it possible to use calc() to multiply or divide with unit-based values (like 100%, 5px, etc).

For example I was hoping to do something like this:

    width: calc(100% * (.7 - 120px / 100%));

Hoping it resolved to something like (assuming 100% = 500px):

    width: calc(500px * (.7 - 120px / 500px));
    width: calc(500px * (.7 - .24));
    width: calc(500px * .46);
    width: calc(230px);

However after some experimenting it looks like I can&#39;t have a unit-based value as the denominator for division. 

I also don&#39;t seem to be able to multiple two values together like `5px * 10px` or `5px * 100%`.

I know it doesn&#39;t make sense in 100% of the cases to allow this, but in my use-case, I&#39;d like to know what percentage 120px is of the overall width, which I then feed in to the rest of my calculation.

Either that, or if someone could figure out a different way to write it, that would work as well. I&#39;ve racked my brain and couldn&#39;t come up with anything.

CSS calc() - Multiplication and Division with unit-ed values

I would like to put a white bar which would take all of the width at the bottom of the screen. To do so I thought about using `absolute` positioning with the inherited `flexbox` parameters. 

With the following code it renders something like [this][1]. 

Here is my code :

    var NavigationBar = React.createClass({
      render: function() {
        return(
        &lt;View style={navigationBarStyles.navigationBar}&gt;
          //Icon 1, Icon 2...
        &lt;/View&gt;
        );
      }
    });
    
    var Main = React.createClass({
      render: function() {
        return(
          &lt;View style={mainStyles.container}&gt;
              &lt;NavigationBar /&gt;
          &lt;/View&gt;
        );
      }
    });
    
    var mainStyles = StyleSheet.create({
      container: {
        flex: 1,
        backgroundColor: &#39;#456783&#39;,
      }
    });
    
    var navigationBarStyles = StyleSheet.create({
      navigationBar: {
        backgroundColor: &#39;#FFFFFF&#39;,
        height: 30,
        position: &#39;absolute&#39;, 
        flexDirection: &#39;row&#39;,
        bottom: 0,
        justifyContent: &#39;space-between&#39;
      },
    });

I&#39;m new to styling in CSS and not all the properties are available in React-Native. So any help is appreciated, thanks :)

  [1]: http://img11.hostingpics.net/pics/494574Capturedcran20150409164910.png

Absolute and Flexbox in React Native

I&#39;m using a flex box to display 8 items that will dynamically resize with my page. How do I force it to split the items into two rows? (4 per row)?

Here is a relevant snip:

(Or if you prefer jsfiddle - http://jsfiddle.net/vivmaha/oq6prk1p/2/)

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    .parent-wrapper {
      height: 100%;
      width: 100%;
      border: 1px solid black;
    }
    .parent {
      display: flex;
      font-size: 0;
      flex-wrap: wrap;
      margin: -10px 0 0 -10px;
    }
    .child {
      display: inline-block;
      background: blue;
      margin: 10px 0 0 10px;
      flex-grow: 1;
      height: 100px;
    }

&lt;!-- language: lang-html --&gt;

    &lt;body&gt;
      &lt;div class=&quot;parent-wrapper&quot;&gt;
        &lt;div class=&quot;parent&quot;&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
          &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/body&gt;

&lt;!-- end snippet --&gt;



Flexbox: 4 items per row

I have html as:-

    &lt;footer&gt;
    &lt;div class=&quot;container&quot;&gt;
        &lt;div class=&quot;row&quot;&gt;
            &lt;div class=&quot;col-xs-12 col-sm-6 text-left&quot;&gt;
                &lt;p&gt;
                    &amp;copy; 2015 example.com. All rights reserved.
                &lt;/p&gt;
            &lt;/div&gt;
            &lt;div class=&quot;col-xs-12 col-sm-6 text-right&quot;&gt;
                &lt;p&gt;
                    &lt;a href=&quot;#&quot;&gt;&lt;i class=&quot;fa fa-facebook&quot;&gt;&lt;/i&gt;&lt;/a&gt; 
                    &lt;a href=&quot;#&quot;&gt;&lt;i class=&quot;fa fa-twitter&quot;&gt;&lt;/i&gt;&lt;/a&gt; 
                    &lt;a href=&quot;#&quot;&gt;&lt;i class=&quot;fa fa-google-plus&quot;&gt;&lt;/i&gt;&lt;/a&gt;
                &lt;/p&gt;
            &lt;/div&gt;
        &lt;/div&gt;
    &lt;/div&gt;
    &lt;/footer&gt;

From the code you can see that the column&#39;s text are left and right aligned respectively. However in the xs mode I like them to be center aligned. How can I do this using twitter bootstrap?

How can I align text center on small screens with Bootstrap?

Is there a way to make a line break in multiple line flexbox?

For example to break after each 3rd item in [this CodePen][1].

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-css --&gt;

    .container {
      background: tomato;
      display: flex;
      flex-flow: row wrap;
      align-content: space-between;
      justify-content: space-between;
    }
    .item {
      width: 100px;
      height: 100px;
      background: gold;
      border: 1px solid black;
      font-size: 30px;
      line-height: 100px;
      text-align: center;
      margin: 10px;
    }
    .item:nth-child(3n) {
      background: silver;
    }

&lt;!-- language: lang-html --&gt;

    &lt;div class=&quot;container&quot;&gt;
      &lt;div class=&quot;item&quot;&gt;1&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;2&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;3&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;4&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;5&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;6&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;7&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;8&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;9&lt;/div&gt;
      &lt;div class=&quot;item&quot;&gt;10&lt;/div&gt;
    &lt;/div&gt;

&lt;!-- end snippet --&gt;

Like

    .item:nth-child(3n){
      /* line-break: after; */    
    }


  [1]: https://codepen.io/asvirskyi/pen/bdbLNz

How to specify line breaks in a multi-line flexbox layout?

CodePen: http://codepen.io/anon/pen/RPNpaP.

I want the red box to be only 25 em wide when it&#39;s in the side-by-side view - I&#39;m trying to achieve this by setting the CSS inside this media query:

    @media all and (min-width: 811px) {...}

to:

    .flexbox .red {
      width: 25em;
    }

But when I do that, this happens:

http://i.imgur.com/niFBrwt.png

Any idea what I&#39;m doing wrong?

How to set a fixed width column with CSS flexbox

On the homepage of http://www.shopifyexperte.de/ there are two flex-box modules, one under &quot;Kundenstimmen&quot; and one under &quot;Neueste Beitr&#228;ge...&quot;. The inner boxes are supposed to wrap when they go below 220px and not grow above 30% width. This works in latest Chrome, FF and Opera (all on Mac), but in Safari 8.0.5 (Mac) and any iOS browser the boxes never form a row even if there&#39;s enough room. They always wrap, each one on a row of its own.

The CSS for the container:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    .homepage-testimonial-container {
    	display: flex;
    	display: -webkit-flex;
    	-webkit-flex: 1;
    	flex: 1;
    	-webkit-flex-direction: row;
    	flex-direction: row;
    	-webkit-flex-wrap: wrap;
    	flex-wrap: wrap;
    	-webkit-justify-content: space-between;
    	justify-content: space-between;
    	-webkit-align-items: flex-start;
    	align-items: flex-start;
    	margin-top: 1em;
    }

&lt;!-- end snippet --&gt;

The CSS for the boxes inside the container:

&lt;!-- begin snippet: js hide: false --&gt;

&lt;!-- language: lang-css --&gt;

    .homepage-testimonial {
    	margin-bottom: 1em;
    	min-width: 220px;
    	max-width: 30%;
    	-webkit-flex: 1 1 auto;
    	flex: 1 1 auto;
    }

&lt;!-- end snippet --&gt;

If I disable -webkit-flex-wrap (effectively setting it to nowrap), all boxes line up in a row but eventually overflow the container when the browser window gets too narrow.

Is this some kind of bug in Safari/Webkit or am I doing something wrong here?

Content Type	Original Author	Original Content on Stackoverflow
Question	Deborah Cole	View Question on Stackoverflow
Solution 1 - Css	Alex Shesterov	View Answer on Stackoverflow

How to stretch children to fill cross-axis?

Css Problem Overview

Css Solutions

Solution 1 - Css

Compiler error: Method with Objective-C selector conflicts with previous declaration with the same Objective-C selector

Get size of a View in React Native

Attributions