The shortcut is ^6 (a.k.a. Control+6). To change the shortcut go to Xcode--&gt;Preferences...-&gt;Key Bindings, and look for the View Menu list. It is called &quot;Standard editor -&gt; Show Document items&quot;

**control+6**. Pres control and 6 together. :)

&gt; **Possible Duplicate:**  
&gt; [Serializing to JSON in jQuery](https://stackoverflow.com/questions/191881/serializing-to-json-in-jquery)  

&lt;!-- End of automatically inserted text --&gt;

I&#39;m using jquery as a library in my javascript code. But sometimes I have to `JSON.stringify()`.

When I want to keep my code IE compatible I use &lt;br&gt; 
`$(&quot;head&quot;).append(&#39;&lt;script type=&quot;text/javascript&quot; src=&quot;../Includes/json2.js&quot;&gt;&lt;/script&gt;&#39;);` &lt;br&gt; to get my `JSON.stringify()` to work. Isn&#39;t there a equivalent in `jquery` for `JSON.stringify()`?

jquery equivalent for JSON.stringify

In case of `ifstream` in C++, under what conditions are `failbit` and `badbit` flags set ?

C++ ifstream failbit and badbit

I am looking for a way to open the method popup that shows up when you click the navigation-bar in XCode.

is there a way to do this by using a shortcut?


![enter image description here][1]


  [1]: http://i.stack.imgur.com/qZxtM.png

shortcut to open method dropdown in xcode

I am looking for a way to open the method popup that shows up when you click the navigation-bar in XCode.
is there a way to do this by using a shortcut?
<img src="http://i.stack.imgur.com/qZxtM.png" alt="enter image description here">

I am new to Xcode (using 4.3) and am not sure how to save an image to the device&#39;s camera roll.  All that I have done so far is set up an IBAction for the button to save the image. What library method or function can I use to save an image to the user&#39;s camera roll?

How can I save an image to the camera roll?

Ok, here is the deal, I **hate** putting out questions about my debugging and crashes. Because I usually handle them myself, but I just **cannot** get my way around this, even after **viewing multiple questions already**.

Ok so here is the problem, I find my app randomly on and off crashing with this stack trace:


    *** -[ViewController respondsToSelector:]: message sent to deallocated instance 0x1e5d2ef0

Where `ViewController` can vary, sometimes the place where my code crashes, has **NO** relevance to that particular `ViewController` and doesn&#39;t own or call it.

Also, to get that console trace, I have enabled Zombies, otherwise I would get no console print at all, I would only get: `objc_msgSend`, which I know means I am messaging something that is released. But I cannot find where that is... I am really stuck! Usually I **always** debug my crashes, so I am really stuck on this.

Again, this crashes in different places at different times, on and off. And the place it crashes has almost **no** relevance to the `ViewController`. And I find this very confusing. 

Do you need any of my code? I have **a lot** of files and since it is crashing in different places, distributing my code will be a mess!

I have tried to add symbolic breakpoints with no luck, and Zombies is not available on the Instruments application for iOS. I cannot run my app on the simulator as it has unsupportive architecture frameworks for it.

Thanks everyone...

ViewController respondsToSelector: message sent to deallocated instance (CRASH)

Note, for the below question:  All assets are local on the device -- no network streaming is taking place.  The videos contain audio tracks.

I&#39;m working on an iOS application that requires playing video files with minimum delay to start the video clip in question.  Unfortunately we do not know what specific video clip is next until we actually need to start it up.  Specifically: When one video clip is playing, we will know what the next set of (roughly) 10 video clips are, but we don&#39;t know which one exactly, until it comes time to &#39;immediately&#39; play the next clip.

What I&#39;ve done to look at actual start delays is to call `addBoundaryTimeObserverForTimes` on the video player, with a time period of one millisecond to see when the video actually started to play, and I take the difference of that time stamp with the first place in the code that indicates which asset to start playing.

From what I&#39;ve seen thus-far, I have found that using the combination of `AVAsset` loading, and then creating an `AVPlayerItem` from that once it&#39;s ready, and then waiting for `AVPlayerStatusReadyToPlay` before I call play, tends to take between 1 and 3 seconds to start the clip.

I&#39;ve since switched to what I think is roughly equivalent: calling `[AVPlayerItem playerItemWithURL:]` and waiting for `AVPlayerItemStatusReadyToPlay` to play.  Roughly same performance.

One thing I&#39;m observing is that the first AVPlayer item load is slower than the rest.  Seems one idea is to pre-flight the AVPlayer with a short / empty asset before trying to play the first video might be of good general practice. [https://stackoverflow.com/questions/900461/slow-start-for-avaudioplayer-the-first-time-a-sound-is-played]

I&#39;d love to get the video start times down as much as possible, and have some ideas of things to experiment with, but would like some guidance from anyone that might be able to help.

**Update: idea 7, below, as-implemented yields switching times of around 500 ms.  This is an improvement, but it it&#39;d be nice to get this even faster.**

**Idea 1:  Use N AVPlayers (won&#39;t work)**

Using ~ 10 `AVPPlayer` objects and start-and-pause all ~ 10 clips, and once we know which one we really need, switch to, and un-pause the correct `AVPlayer`, and start all over again for the next cycle.

I don&#39;t think this works, because I&#39;ve read there is roughly a limit of 4 active `AVPlayer&#39;s` in iOS.  There was someone asking about this on StackOverflow here, and found out about the 4 AVPlayer limit: [fast-switching-between-videos-using-avfoundation](https://stackoverflow.com/questions/7406300/fast-switching-between-videos-using-avfoundation)

**Idea 2: Use AVQueuePlayer (won&#39;t work)**

I don&#39;t believe that shoving 10 `AVPlayerItems` into an `AVQueuePlayer` would pre-load them all for seamless start.  `AVQueuePlayer` is a queue, and I think it really only makes the next video in the queue ready for immediate playback.  I don&#39;t know which one out of ~10 videos we do want to play back, until it&#39;s time to start that one. [ios-avplayer-video-preloading](https://stackoverflow.com/questions/8354210/ios-avplayer-video-preloading)

**Idea 3: Load, Play, and retain `AVPlayerItems` in background (not 100% sure yet -- but not looking good)**

I&#39;m looking at if there is any benefit to load and play the first second of each video clip in the background (suppress video and audio output), and keep a reference to each `AVPlayerItem`, and when we know which item needs to be played for real, swap that one in, and swap the background AVPlayer with the active one.  Rinse and Repeat.

The theory would be that recently played `AVPlayer/AVPlayerItem`&#39;s may still hold some prepared resources which would make subsequent playback faster.  So far, I have not seen benefits from this, but I might not have the `AVPlayerLayer` setup correctly for the background.  I doubt this will really improve things from what I&#39;ve seen.

**Idea 4: Use a different file format -- maybe one that is faster to load?**  

I&#39;m currently using .m4v&#39;s (video-MPEG4) H.264 format.  H.264 has a lot of different codec options, so it&#39;s possible that some options are faster to seek than others.  I have found that using more advanced settings that make the file size smaller increase the seek time, but have not found any options that go the other way.

**Idea 5: Combination of lossless video format + AVQueuePlayer**

If there is a video format that is fast to load, but maybe where the file size is insane, one idea might be to pre-prepare the first 10 seconds of each video clip with a version that is bloated but faster to load, but back that up with an asset that is encoded in H.264.  Use an AVQueuePlayer, and add the first 10 seconds in the uncompressed file format, and follow that up with one that is in H.264 which gets up to 10 seconds of prepare/preload time.  So I&#39;d get &#39;the best&#39; of both worlds:  fast start times, but also benefits from a more compact format.

**Idea 6: Use a non-standard AVPlayer / write my own / use someone else&#39;s**

Given my needs, maybe I can&#39;t use AVPlayer, but have to resort to AVAssetReader, and decode the first few seconds (possibly write raw file to disk), and when it comes to playback, make use of the raw format to play it back fast.  Seems like a huge project to me, and if I go about it in a naive way, it&#39;s unclear / unlikely to even work better.  Each decoded and uncompressed video frame is 2.25 MB.  Naively speaking -- if we go with ~ 30 fps for the video, I&#39;d end up with ~60 MB/s read-from-disk requirement, which is probably impossible / pushing it.  Obviously we&#39;d have to do some level of image compression (perhaps native openGL/es compression formats via PVRTC)... but that&#39;s kind crazy.  Maybe there is a library out there that I can use?

**Idea 7: Combine everything into a single movie asset, and seekToTime**

One idea that might be easier than some of the above, is to combine everything into a single movie, and use seekToTime.  The thing is that we&#39;d be jumping all around the place.  Essentially random access into the movie.  I think this may actually work out okay: [avplayer-movie-playing-lag-in-ios5](https://stackoverflow.com/questions/7882621/avplayer-movie-playing-lag-in-ios5)


Which approach do you think would be best?  So far, I&#39;ve not made that much progress in terms of reducing the lag.


How to reduce iOS AVPlayer start delay

This is a **WEB APP** not a native app. Please no Objective-C NS commands.

So I need to detect &#39;pinch&#39; events on iOS. Problem is every plugin or method I see for doing gestures or multi-touch events, is (usually) with jQuery and is a whole additional pluggin for every gesture under the sun. My application is huge, and I am very sensitive to deadwood in my code. All I need is to detect a pinch, and using something like jGesture is just way to bloated for my simple needs.

Additionally, I have a limited understanding of how to detect a pinch manually. I can get the position of both fingers, can&#39;t seem to get the mix right to detect this. Does anyone have a simple snippet that JUST detects pinch?

Simplest way to detect a pinch

I was wondering if it&#39;s possible to determine what kind of iPhone (for example) the currentdevice is? I know it&#39;s possible to get the model through  
    `NSString *deviceType = [[UIDevice currentDevice] model];`  
which will just return whether I have an &quot;iPhone&quot; or an &quot;iPod&quot;, BUT I was wondering if it&#39;s possible to detect/know if I have an iPhone 3GS vs. and iPhone 4 vs. an iPhone 4S _(in actuality, all I really want to do is determine if I have a 3G or not, because I&#39;m doing fairly graphics intensive stuff)_. 

So yeah, let me know, thank you!

How to get device make and model on iOS?

I am trying to monitor calls from an app to my server just like Firebug does.
I could not find a way to see that in iOS Simulator or in xCode.

Is there a way to do that without sniffing all the traffic?
If no, what tool would you suggest?

How to monitor network calls made from iOS Simulator

This is a weird crash I am getting. The crash happens when I press a button that goes to a certain ViewController. The line which it crashes on is:

    DestinationInformationViewController *info = [[DestinationInformationViewController alloc] init];
    [info setModalTransitionStyle: UIModalTransitionStyleCrossDissolve];
    [self presentViewController:info animated:YES completion: nil]; // CRASHES HERE
    [info release];


 The crash trace is:

`*** Terminating app due to uncaught exception &#39;NSInvalidUnarchiveOperationException&#39;, reason: &#39;Could not instantiate class named NSLayoutConstraint&#39;
*** First throw call stack:
(0x3758288f 0x35287259 0x37582789 0x375827ab 0x3153d54d 0x3153d6bb 0x3153d423 0x314ce001 0x3143c3c7 0x31319c59 0x3128fc17 0x3129a267 0x3129a1d5 0x3133959b 0x31338367 0x84091 0x374dc3fd 0x31271e07 0x31271dc3 0x31271da1 0x31271b11 0x31272449 0x3127092b 0x31270319 0x31256695 0x31255f3b 0x33c9822b 0x37556523 0x375564c5 0x37555313 0x374d84a5 0x374d836d 0x33c97439 0x31284cd5 0x82bb3 0x71200)
terminate called throwing an exception(gdb) Could not instantiate class named NSLayoutConstraint`



NOTE: This crashes on my iPhone 4 iOS 5.1 but not on my iPhone 4S iOS 6 Beta 2

presentViewController: crash on iOS &lt;6 (AutoLayout)

I created first my TestViewController.h and *.m. Afterwards my TestView.xib. 

Now I need to tell my xib: &quot;Yes, please take the class TestViewController as my File&#39;s Owner&quot;.

I open up my xib, go to the Identity Inspector of its fileOwner and choose under &quot;Custom Class&quot; TestViewController.

But this seems not enough - as when I open up the TestView.xib, and then choose the &quot;Assistent Editor View&quot; it should bring up the corresponding ViewController on the right part of the split screen - in my case the &quot;TestViewController.h&quot;. But it doesn&#39;t !

Is it necessary to bind the xib in any way to its viewcontroller by dragging lines to files like you do it with outlets and actions?



Xcode - How to connect XIB to ViewController Class

When I try to submit my app on the App Store through Xcode I got this&#160;error.

&gt; A server with the specified hostname could not be found.

Is this temporary error at Apple or something to do with&#160;Xcode?

Is anyone else facing this problem?

A server with the specified hostname could not be found

By default it is not possible to see .gitignore files in osx. What is command to reveal these files?

Show system files / Show git ignore in osx

On Linux, I have a --parents option available for the cp command so I can do 

    cp --parents test/withintest/go.rb test2

http://www.gnu.org/software/coreutils/manual/html_node/cp-invocation.html

On Mac, I do not have this option available. Is there a way to do this on Mac? Why is this option not available?

PS. The purpose of --parents is the following:

&gt; ‘--parents’ Form the name of each destination file by appending to the
&gt; target directory a slash and the specified name of the source file.

&gt; The last argument given to cp must be the name of an existing
&gt; directory. 

&gt; For example, the command:

&gt;           cp --parents a/b/c existing_dir 

&gt; copies the file a/b/c to existing_dir/a/b/c, creating any missing intermediate directories.

cp --parents option on mac

Currently I am using Node.js v0.6.16 on Mac OS X 10.7.4. Now I want to upgrade it to the latest Node.js v0.8.1. But after downloading and installing the latest package file from nodejs.org, I found that system is still using v0.6.16 instead of v0.8.1 when I typed &quot;node -v&quot; in a terminal. Is there any step that I have missed? Or, should I thoroughly uninstall the old version before installing the latest one?

BTW, I know that nvm can help to manage the nodejs package

https://github.com/creationix/nvm/

Is there any way to upgrade the Node.js without using it?

I have googled this problem, but it seems to me that there is no very clear answer to this question for the latest Node.js.

Upgrade Node.js to the latest version on Mac OS

I have a pkg file created by Install Maker for Mac.
I want to replace one file in pkg. But I must do this under Linux system, because this is a part of download process. When user starts to download file server must replace one file in pkg.
I have a solution how unpack pkg and replace a file but I dont know how pack again to pkg.
http://emresaglam.com/blog/1035
[http://ilostmynotes.blogspot.com/2012/06/mac-os-x-pkg-bom-files-package.html][1]



  [1]: http://ilostmynotes.blogspot.com/2012/06/mac-os-x-pkg-bom-files-package.html

How to unpack and pack pkg file?

I&#39;m getting a really annoying side effect happening in osx that I can&#39;t seem to find a way to fix: for some reason the full screen applications keep switching positions. For example, if I have Safari, Mail and Xcode open in full screen, in exactly that order, every once in a while they will swap positions (eg. Xcode will sometimes move to the left, so the that swiping left will bring me to Safari instead of mail). The order of these applications is important for productivity purposes, and it gets really confusing when you have 6 of them open and all of a sudden Mail goes from spot 6 to spot 2.

Any ideas how to get this switching of places to stop?

Full screen apps keep switching places

Is there any keyboard shortcut to move the cursor between methods in Visual Studio? Is there any plugins that can do the same job?

All the time when I program, I want to go at the end of the current method and if I could have a shortcut that can move the cursor at the beginning of the next method and then just have to type a couple of up arrow to be where I want would be fantastic.

Thank you.

Is there a keyboard shortcut to move the cursor between methods in Visual Studio 2010?

I want to comment out a block of code in sublime text.

I see it in RailsCasts, but don&#39;t think he uses sublime text ... to do the following ...

    if (uncommented)
      some uncommented example
      # if (commented) 
      #   some commented example code
      # end
    end

Is there a shortcut in sublime text that I can use to insert the block of #&#39;s?

Shortcut to comment out a block of code with sublime text

Is there a shortcut or a command to select word under cursor in Sublime Text or Atom? I want a replacement for double-click. So I could press shortcut instead and get selection on a current word and start typing to replace it or get in quotes etc...

Is there a shortcut for selecting word under cursor in Sublime Text, Atom

There is a behavior in my mac that I&#39;m trying to disable.

When I&#39;m in any text editor and typing a key combination using the `alt`/`option`+any letter, the output will be special characters.

_For example:_  
the combination `alt+a` will generate `&#229;`.  
the combination `alt+x` will generate `≈`.  

I want to cancel this behavior.  
I&#39;m a programmer and when I use my code editor I want to map some keybinding (keyboard shortcuts) to the `alt` key (`⌥+a` for example) but when I do that it doesn&#39;t execute because it generates the special characters.  
I guess that the special character has a priority over my code editor shortcuts.

Do you know how can I disable this default behavior?

Thank you

How to disable generating special characters when pressing the `alt+a`/`option+a` keybinding in Mac OS (`⌥+a` )?

In VS2010 I had a shortcut set up &lt;kbd&gt;Alt&lt;/kbd&gt;+&lt;kbd&gt;Up/Down&lt;/kbd&gt; to move lines of code up or down, just like I used to have in Eclipse in my Java days.

Now since Power Tools and macros (which is how I set up this shortcut in VS2010) are not available in VS2012, how do I get this to work?

I&#39;ve seen somebody mentioned that Resharper can do this, but for the love of fire and water, I can&#39;t find the command names in the list of commands that can do that.
I have tried ReSharper_MoveUp/MoveDown and that does not move lines up/down:

![Move_Up command did not do the trick](http://i.stack.imgur.com/NHRPQ.png)

This moves blocks of text up and down. I just want line-by-line up or down, no fancy logic there.
Before

![What I have][1]

After &lt;kbd&gt;ALT&lt;/kbd&gt;+&lt;kbd&gt;Up&lt;/kbd&gt; (when cursor is on WriteLine line)  I would like to see this:

![Line moved one up, inside the bracket, indented][2]
    


I have seen these threads: https://stackoverflow.com/questions/4526715/whats-the-equivalent-for-eclipses-altup-down-move-line-in-visual-studio, https://stackoverflow.com/questions/313462/visual-studio-hotkeys-to-move-line-up-down-and-move-through-recent-changes, but none of the suggested solutions work in VS2012. 

Any other ideas?


**UPD 7 Nov 2012:** . Extensions are catching up with Visual Studio 2012. Now I know at least 3 extensions that provide this functionality:

 - [MoveLine Extension][3]. Link provided by [Carl G][4]
 - [Move Line Extension][5] with modifications to 2010 version. By [gius][6]
 - [Productivity Power Tools 2012][7]. Have not actually tried this, but [this blog post][8] states it does the line move up/down

**UPD 15 Nov 2012:** Just stumbled across another extension that claims it does what is required here. Have not tried it though: [LineMan Extension][9]


**UPD 10 May 2015** Just installed VS2015 RC and this is built-in already:
[![MoveLineUp/Down][10]][10]


  [1]: http://i.stack.imgur.com/C8E7c.png
  [2]: http://i.stack.imgur.com/CLe3u.png
  [3]: http://visualstudiogallery.msdn.microsoft.com/b3ee08dc-a28f-4aec-9efa-69215ab5ee52
  [4]: https://stackoverflow.com/a/12696202/809357
  [5]: http://visualstudiogallery.msdn.microsoft.com/814eb3c4-7d5e-4217-9711-e20117b20649
  [6]: https://stackoverflow.com/a/12530141/809357
  [7]: http://visualstudiogallery.msdn.microsoft.com/3a96a4dc-ba9c-4589-92c5-640e07332afd
  [8]: http://blogs.msdn.com/b/visualstudio/archive/2012/11/07/productivity-power-tools-2012.aspx
  [9]: http://visualstudiogallery.msdn.microsoft.com/92ef7620-d7f6-493f-825a-ba52d07d56c2?SRC=VSIDE
  [10]: http://i.stack.imgur.com/VhhJt.png

Content Type	Original Author	Original Content on Stackoverflow
Question	choise	View Question on Stackoverflow
Solution 1 - Ios	Thermometer	View Answer on Stackoverflow
Solution 2 - Ios	san	View Answer on Stackoverflow

shortcut to open method dropdown in xcode

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

C++ ifstream failbit and badbit

jquery equivalent for JSON.stringify

Attributions