Launch the app in simulator. Then Press &lt;kbd&gt;Cmd&lt;/kbd&gt;+&lt;kbd&gt;Shift&lt;/kbd&gt;+&lt;kbd&gt;4&lt;/kbd&gt; followed by &lt;kbd&gt;space&lt;/kbd&gt; and then click on the simulator to take the screenshot with the simulator frame.

if you hold the Option key while you shoot the image, it will save the screenshot without shadows around the beze

On the [AppStore Resource Center][1] you can find Apple Product images that can be used to promote your app. There&#39;s also some [guidelines][2] on how to use the resources correctly.

UPDATE: 
Guidelines apart, a friend found a service today that does exactly what you want:
[PlaceIt][3]


  [1]: http://developer.apple.com/appstore/resources/marketing/index.html
  [2]: https://developer.apple.com/appstore/AppStoreMarketingGuidelines.pdf
  [3]: http://placeit.breezi.com/

If you launch the iPhone Simulator in Xcode you can just capture that window on a Mac using the built-in application called Grab. Outputs to a number of your favorite graphics formats.

Here&#39;s my problem. I implemented a small script that does some heavy calculation, as a node.js module. So, if I type &quot;node myModule.js&quot;, it calculates for a second, then returns a value.
Now, I want to use that module from my main Node.JS program. I could just put all the calculation in a &quot;doSomeCalculation&quot; function then do:

    var myModule = require(&quot;./myModule&quot;);
    myModule.doSomeCalculation();

But that would be blocking, thus it&#39;d be bad. I&#39;d like to use it in a non-blocking way, like DB calls natively are, for instance. So I tried to use child_process.spawn and exec, like this:

    var spawn = require(&quot;child_process&quot;).spawn;
    var ext = spawn(&quot;node ./myModule.js&quot;, function(err, stdout, stderr) { /* whatevs */ });
    ext.on(&quot;exit&quot;, function() { console.log(&quot;calculation over!&quot;); });

But, of course, it doesn&#39;t work. I tried to use an EventEmitter in myModule, emitting &quot;calculationDone&quot; events and trying to add the associated listener on the &quot;ext&quot; variable in the example above. Still doesn&#39;t work.

As for forks, they&#39;re not really what I&#39;m trying to do. Forks would require putting the calculation-related code in the main program, forking, calculating in the child while the parent does whatever it does, and then how would I return the result?

So here&#39;s my question: can I use a child process to do some non-blocking calculation, when the calculation is put in a Node file, or is it just impossible? Should I do the heavy calculation in a Python script instead? In both cases, how can I pass arguments to the child process - for instance, an image?

How can I execute a node.js module as a child process of a node.js program?

Ok, so I have heard different opinions on this subject and just want to make sure I understand it correctly.

## For C++

Declarations `void f();` and `void f(void);` mean precisely the same thing, the function `f` does not take any parameters. Ditto for definitions.

## For C

Declaration `void f(void);` means that `f` does not take any parameters. 

Declaration `void f();` means that function `f` may or may not have parameters, and if it does, we don&#39;t know what kind of parameters those are, or how many there is of them. Note that it is NOT the same as ellipsis, we can&#39;t use `va_list`.

Now here is where things get interesting. 

### Case 1

Declaration:

    void f();

Definition:

    void f(int a, int b, float c)
    {
       //...
    }

### Case 2

Declaration:

    void f();

Definition:

    void f()
    {
       //...
    }

### Question:

What happens at compile time in cases 1 and 2 when we call `f` with the correct arguments, wrong arguments and no arguments at all? What happens at run time?

### Additional question:

If I declare `f` with arguments, but define it without them, will it make a difference? Should I be able to address the arguments from the function body?


Understanding the difference between f() and f(void) in C and C++ once and for all

I want to [take screenshots](https://stackoverflow.com/questions/7092613/take-screenshots-in-the-ios-simulator?rq=1) of my iOS apps running from Xcode in the iPhone Simulator and iPad Simulator.

However, when I take screenshots, only the screen is captured. The device frame (which *is* shown on my desktop surrounding the iOS Simulator window) is not included in the screenshot.

How can I take screenshots of Xcode&#39;s iOS Simulator app and include the bounding hardware device frame?

Take iOS Simulator screenshots including device frame?

I want to <a href="https://stackoverflow.com/questions/7092613/take-screenshots-in-the-ios-simulator?rq=1" target="_blank" rel="noopener noreferrer">take screenshots</a> of my iOS apps running from Xcode in the iPhone Simulator and iPad Simulator.
However, when I take screenshots, only the screen is captured. The device frame (which is shown on my desktop surrounding the iOS Simulator window) is not included in the screenshot.
How can I take screenshots of Xcode's iOS Simulator app and include the bounding hardware device frame?

**What&#39;s happening**

Currently I have an application that uses two `UICollectionViews` inside a `UITableView`. This way I create a Pulse News look like application. My problem with this is that sometimes the 6th and 11th row disappears completely, leaving a blank space where it should be the cell. I wouldn&#39;t actually mind, if all the cells were like this (and this way I could assume that I wasn&#39;t doing things correctly), but the thing is, is just happening with those specific ones.

**My theory**

The 6th and 11th rows are the ones that appears when I start scrolling, so by default I am able to see 5 cells, and when I do the first horizontal scrolling the 6th comes up (blank space sometimes). 

**What I have**

The only thing I am doing at the moment is this:

     [self.collectionView registerNib:[UINib nibWithNibName:CELL_NIB_NAME bundle:nil] forCellWithReuseIdentifier:CELL_IDENTIFIER];

On the `viewDidLoad`. And on the creation of the cell:

    - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
    {
        MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CELL_IDENTIFIER forIndexPath:indexPath];
        
        NSMutableDictionary *dictionary = [self.DataSource objectAtIndex:[indexPath row]];
        
        [cell buildViewWithDictionary:dictionary withReferenceParent:self.referenceViewController];
        
        return cell;
    }

So on my understating nothing fancy going on here. I though there was something wrong on the data source (a dummy JSON file), but sometimes it works ok and the cell shows, so I guess from that part is ok. 

So my &quot;question&quot;: Does anyone knows what&#39;s going on? I don&#39;t really like to say that it&#39;s a bug from iOS, but I can&#39;t think of anything else.


----------

**Edit 1.0**

The amazing part is that this method

    -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath;

Is going from `indexPath` [0,4] to [0,6] without calculating the [0,5]. First time I actually see this happening in iOS.


----------

**Edit 2.0**

I have switched the way I am creating the cells, and instead of dequeuing I am using the old way:


    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:CELL_NIB_NAME owner:self options:nil];
    MyCell *cell = (MyCell *)[nib objectAtIndex:0];

Still the same sad result.


UICollectionView&#39;s cell disappearing

I&#39;m working on a Phonegap-based iOS app, which is already done for Android. The following lines are working fine for Android but not for iOS. Why?

    var d = new Date(&quot;2015-12-31 00:00:00&quot;);
    console.log(d.getDate() + &#39;. &#39; + d.getMonth() + &#39; &#39; + d.getFullYear();

Result for Android:

    31.11 2015

Result on iOS:

    NaN. NaN NaN

Where is the difference coming from?

Javascript date is invalid on iOS

I have several `UIViewControllers` in one Storyboard.
Now I want to move some `UIViewControllers` to another Storyboard. Is it possible?

Move or copy view controller from one storyboard to another

I&#39;m not talking about the frame property, because from that you can only get the view&#39;s size in the xib. I&#39;m talking about when the view is resized because of its constraints (maybe after a rotation, or in response to an event). Is there a way to get its current width and height?

I tried iterating through its constraints looking for width and height constraints, but that&#39;s not very clean and fails when there are intrinsic constraints (since I can&#39;t differentiate between the two). Also, that only works if they actually have width and height constraints, which they don&#39;t if they rely on other constraints to resize.

Why is this so difficult for me. ARG!

How can I get a view&#39;s current width and height when using autolayout constraints?

The app [Snapchat][1], on the App Store, is an app that lets you share pictures with a self-destruct on them. You can only view the pics for X seconds. If you attempt to take a screenshot while the picture is showing using the home-power key combo, it will tell the sender you tried to take a screenshot.

What part of the SDK lets you detect that the user is taking a screenshot? I did not know this was possible.


  [1]: https://itunes.apple.com/us/app/snapchat/id447188370?mt=8

iOS Detection of Screenshot?

Currently I&#39;m trying to capture a screenshot using the Selenium WebDriver. But I can only obtain the whole page screen shot. However, what I wanted is just to capture a part of the page or perhaps just on specific element based on ID or any specific element locator. (For example, I wish to capture the picture with image id = &quot;Butterfly&quot;)

Is there any way to capture a screenshot by selected item or element?

How to capture the screenshot of a specific element rather than entire page using Selenium Webdriver?

Basically, I am doing what the heading states, attempting to save the contents of a div as an image.

I plan on making a small online application for the iPad.

One function that is a must is having a &#39;Save&#39; button that can save the full webpage as an image, and save that image to the iPad&#39;s camera roll. I wish to save the full contents of a div, not just the visible area.

I have searched briefly online, but couldn&#39;t find much documentation on anything. I found a lot on HTML5 Canvas. Here is some code I put together:

    &lt;script&gt;
    function saveimg()
    {
    	var c = document.getElementById(&#39;mycanvas&#39;);
    	var t = c.getContext(&#39;2d&#39;);
    	window.location.href = image;
    	
    	window.open(&#39;&#39;, document.getElementById(&#39;mycanvas&#39;).toDataURL());
    }
    &lt;/script&gt;
    
    &lt;div id=&quot;mycanvas&quot;&gt;
    This is just a test&lt;br /&gt;
    12344&lt;br /&gt;
    &lt;/div&gt;
    
    &lt;button onclick=&quot;saveimg()&quot;&gt;Save&lt;/button&gt;

Although, I am getting this error:

    TypeError: c.getContext is not a function

This application will be built only with HTML, CSS and jQuery (or other Javascript libraries).

How to save the contents of a div as a image?

I need to prevent screen capture by users of my app, for security reasons.  The contents I display are confidential and should not be copied onto the device.  I saw [one answer on Stack Overflow, but for Android](https://stackoverflow.com/questions/6764568/prevent-screen-capture-in-android-apps).

Is it possible somehow in iOS to prevent screen capture? 

While capturing the screenshot into the gallery by the click of few buttons is a very useful feature for the user, there is a limited requirement to prevent it too. Any pointers?

Prevent screen capture in an iOS app

I&#39;ve found [this code][1]:

    func screenShotMethod() {
        //Create the UIImage
        UIGraphicsBeginImageContext(view.frame.size)
        view.layer.renderInContext(UIGraphicsGetCurrentContext())
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        //Save it to the camera roll
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
    }

What do I need to do to get all the other elements, like the navigation bar, into the screenshots?


  [1]: https://stackoverflow.com/a/25445629

Content Type	Original Author	Original Content on Stackoverflow
Question	Kieran	View Question on Stackoverflow
Solution 1 - Ios	Sapan Diwakar	View Answer on Stackoverflow
Solution 2 - Ios	Marcelo	View Answer on Stackoverflow
Solution 3 - Ios	Cameron Lowell Palmer	View Answer on Stackoverflow

Take iOS Simulator screenshots including device frame?

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

Solution 3 - Ios

Understanding the difference between f() and f(void) in C and C++ once and for all

How can I execute a node.js module as a child process of a node.js program?

Attributions