`@dynamic` means “my class will figure out how to respond to this at runtime.” Uses a runtime mechanism for an object to intercept messages it normally wouldn’t respond to. In the case where a Core Data db is used to store persistent data, NSManagedObject turns these into calls to `-valueForKey:` and `-setValueForKey:`.

Take a look at [Lecture 12][1] (Fall 2010) of Stanford&#39;s iPhone development course.


  [1]: http://www.stanford.edu/class/cs193p/cgi-bin/drupal/system/files/lectures/Lecture%2012.pdf

**Answer**: `var option_user_selection = element.options[element.selectedIndex].text`

I am trying to build a form that fills in a person&#39;s order.

    &lt;form name=&quot;food_select&quot;&gt;
        &lt;select name=&quot;maincourse&quot; onchange=&quot;firstStep(this)&quot;&gt;
            &lt;option&gt;- select -&lt;/option&gt;
            &lt;option text=&quot;breakfast&quot;&gt;breakfast&lt;/option&gt;
            &lt;option text=&quot;lunch&quot;&gt;lunch&lt;/option&gt;
            &lt;option text=&quot;dinner&quot;&gt;dinner&lt;/option&gt;
        &lt;/select&gt;
    &lt;/form&gt;

What I&#39;m trying to do is send in the select object, pull the name and the text/value from the option menu AND the data in the option tag. 

    function firstStep(element) {
        //Grab information from input element object
        /and place them in local variables
        var select_name = element.name;
        var option_value = element.value;
    }

I can get the name and the option value, but I can&#39;t seem to get the text=&quot;&quot; or the value=&quot;&quot; from the select object. I only need the text/value from the option menu the user selected. I know I can place them in an array, but that doesn&#39;t help

    var option_user_selection = element.options[ whatever they select ].text 

I also need to use the passed in select reference as that is how it&#39;s set up in the rest of my code. 

Later on, that text/value is going to be used to pull the XML document that will populate the next select form dynamically. 

Getting an option text/value with JavaScript

So I have extended VideoView&#39;s onMeasure to scale up the video to fit inside a fullscreen view.

here is how:

    public void setVideoAspect(int w,int h){
		wVideo=w;
		hVideo=h;
		onMeasure(w, h);
	}
	 @Override
     protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec)
     {
		 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		 if(wVideo!=0 &amp;&amp; hVideo!=0)
		 setMeasuredDimension(wVideo,hVideo);
     }

I call setVideoAspect() with the display metrics (width, hight) of the screen.  The problem is that this method stretches the video to fit inside the screen. I want to be able to keep the aspect ratio. (I have 4:3 video and 3:2 screen size.)  I used the folowing code to give the retained ratio measurements to the view:

    int height =  (int) (metrics.widthPixels*3/(float)4);
					        int width=  metrics.widthPixels;   
					        mVideoView.setVideoAspect(width,height);

So this does the job but there is an issue: it gives me a 4:3 video with the width of the screen and scales the height correctly, but it doesn&#39;t center the video. (It just crops the bottom part of the video instead of the top and the bottom equally.) I have a relative layout containing the VideoView with the gravity of the VideoView set to center.

Position Video Inside a VideoView

Objective-C has a feature called @dynamic.

Google only lists results about dynamic typing.

I rarely see this in code and I don&#39;t understand what it is used for. Can anyone explain me this? Thanks.

What does @dynamic do in Objective-C?

Objective-C has a feature called @dynamic.
Google only lists results about dynamic typing.
I rarely see this in code and I don't understand what it is used for. Can anyone explain me this? Thanks.

how can I check if this exists?:

    [[dataArray objectAtIndex:indexPathSet.row] valueForKey:@&quot;SetEntries&quot;]

I want to know whether this key exists or not. How can I do that?

Thank you very much :)

**EDIT:
dataArray has Objects in it. And these objects are NSDictionaries.**

Check key exists in NSDictionary

Lets say we have a custom UITableViewCell

So whenever I click custom button on cell.. it should expand to the some extent (you can say 40 height more...) and when i click again to the same custom button it should collapse to the previous height.

Developer&#39;s please guide me.. how can I achieve this task

UITableViewCell expand on click

I would like to know in what situation did you use `-retainCount` so far, and eventually the problems that can happen using it.

Thanks.

When to use -retainCount?

I have difficulty adding a subview (UIView) from within the viewDidLoad method of a UITableViewController

This works:

    [self.view addSubview:self.progView];

But you can see the table cell lines bleed through the UIView progView.

I&#39;ve tried this approach:

    [self.view.superview insertSubview:self.progView aboveSubview:self.view];

Which is an attempt to add the progView, UIView to the superview, above the current view. When I try this, the UIView never appears.

-- UPDATE --

Following is the latest attempt:

    UIView *myProgView = (UIView *)self.progView; //progView is a method that returns a UIView

    [self.tableView insertSubview:myProgView aboveSubview:self.tableView]; 
    [self.tableView bringSubviewToFront:myProgView];

Result is the same as [self.view addSubview:self.progView]; The UIView appears but seemingly behind the Table. 







How to add a UIView above the current UITableViewController

How do I go about creating a custom keyboard/keypad that will show up when some one taps on a UITextField?  I would like to display a keypad with a, b, c, 1, 2, 3 and an enter button, nothing else.  The keypad should work and behave like the standard keyboard does (in behavior) but it will definitely look different.

I can&#39;t find any example and the best I&#39;ve found is to filter characters with existing keyboard which is an unacceptable solution.


How to create a custom keyboard

I would like to dynamically add properties to a ExpandoObject at runtime. So for example to add a string property call NewProp I would like to write something like

    var x = new ExpandoObject();
    x.AddProperty(&quot;NewProp&quot;, System.String);

Is this easily possible?



Dynamically adding properties to an ExpandoObject

I&#39;d like to access the value of a `dynamic` c# property with a string:

`dynamic d = new { value1 = &quot;some&quot;, value2 = &quot;random&quot;, value3 = &quot;value&quot; };`

How can I get the value of d.value2 (&quot;random&quot;) if I only have &quot;value2&quot; as a string? In javascript, I could do d[&quot;value2&quot;] to access the value (&quot;random&quot;), but I&#39;m not sure how to do this with c# and reflection. The closest I&#39;ve come is this:

`d.GetType().GetProperty(&quot;value2&quot;)` ... but I don&#39;t know how to get the actual value from that.

As always, thanks for your help!

Get value of c# dynamic property via string

How to construct two regex patterns into one?

For example I have one long pattern and one smaller, I need to put smaller one in front of long one.

    var pattern1 = &#39;:\(|:=\(|:-\(&#39;;
    var pattern2 = &#39;:\(|:=\(|:-\(|:\(|:=\(|:-\(&#39;
    str.match(&#39;/&#39;+pattern1+&#39;|&#39;+pattern2+&#39;/gi&#39;);

This doesn&#39;t work. When I&#39;m concatenating strings, all slashes are gone.


Javascript Regexp dynamic generation from variables?

One thing I like very much is reading about different programming languages. Currently, I&#39;m learning Scala but that doesn&#39;t mean I&#39;m not interested in Groovy, Clojure, Python, and many others. All these languages have a unique look and feel and some characteristic features. In the case of Clojure I don&#39;t understand one of these design decisions. As far as I know, Clojure puts great emphasis on its functional paradigm and pretty much forces you to use immutable &quot;variables&quot; wherever possible. So if half of your values are immutable, why is the language dynamically typed?

The Clojure website says:

&gt; First and foremost, Clojure is dynamic. That means that a Clojure program is not just something you compile and run, but something with which you can interact.

Well, that sounds completely strange. If a program is compiled you can&#39;t change it anymore. Sure you can &quot;interact&quot; with it, that&#39;s what UIs are used for but the website certainly doesn&#39;t mean a neat &quot;dynamic&quot; GUI.

**How does Clojure benefit from dynamical typing**

I mean the special case of Clojure and not general advantages of dynamic typing.

**How does the dynamic type system help improve functional programming**

Again, I know the pleasure of not spilling &quot;int a;&quot; all over the source code but type inference can ease a lot of the pain. Therefore I would just like to know how dynamic typing supports the concepts of a functional language.

Why is Clojure dynamically typed?

I&#39;m getting the following error:

&gt; &#39;object&#39; does not contain a definition for &#39;RatingName&#39;

When you look at the anonymous dynamic type, it clearly does have RatingName.

![Screenshot of Error][1]

I realize I can do this with a Tuple, but I would like to understand why the error message occurs.

  [1]: http://i.stack.imgur.com/nafnk.png

Content Type	Original Author	Original Content on Stackoverflow
Question	user142019	View Question on Stackoverflow
Solution 1 - Objective C	Penang	View Answer on Stackoverflow

What does @dynamic do in Objective-C?

Objective C Problem Overview

Objective C Solutions

Solution 1 - Objective C

Position Video Inside a VideoView

Getting an option text/value with JavaScript

Attributions