Exchangeable in practice, while the documentation makes these subtle theoretical distinctions:

 1. `SRCROOT`  
&gt;Directory path. Identifies the directory containing the *target’s* source files: contains the path to the **project** file that defines the **target**.  

  `SOURCE_ROOT` is an undocumented alias to `SRCROOT`
 2. `PROJECT_DIR`  
  Identifies the directory containing the **project** (`.xcodeproj`)  
  `$(PROJECT_DIR)/build` is used as the create the default value for:
  - Intermediate Build Files Path `OBJROOT`  
  - Build Products Path `SYMROOT`

  &gt;Typically these paths are not set per target, but are set per-project or per-user.

 3. `PROJECT_FILE_PATH`  
  Identifies the project itself.  
Equivalent to `$(PROJECT_DIR)/$(PROJECT_NAME).xcodeproj`

Conceptually different (#1 is about the project which defines the **target** while #2 is about the project *independently* of any target), they are always pointing to the same location since you are, in essence, always building a target.

**References**

[Xcode 8.3 Build Settings reference][1]  
[Xcode Build System Guide][2] (Retired 2016-09-29)


  [1]: http://help.apple.com/xcode/mac/8.3/#/itcaec37c2a6
  [2]: https://developer.apple.com/legacy/library/documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html#//apple_ref/doc/uid/TP40003931-CH3-SW49

`SRCROOT` &amp; `PROJECT_DIR` are same macros have same effect.`PROJECT_DIR` makes more sense when talking about frameworks.



`$ (SRCROOT)` represents the project root directory. like this is a relative path, SRCROOT should be used

[![enter image description here][1]][1]

[![enter image description here][2]][2]

`$ (PROJECT_DIR)` represents the entire project. should use PROJECT_DIR to the first test01, which represents the outermost folder of the project

[![enter image description here][3]][3]

When adding files to the project, such as .a, etc., first showinfinder, copy it to the project, and then drag it to the xcode project


  [1]: https://i.stack.imgur.com/RID0P.png
  [2]: https://i.stack.imgur.com/86iEI.png
  [3]: https://i.stack.imgur.com/De4P6.png

I have a component whose template looks something like this:

    &lt;div [my-custom-directive]&gt;Some content here&lt;/div&gt;

I need access to the `MyCustomDirective` class instance used here. When I want to get access to a child component, I use a `ViewChild` query.

Is there an equivalent feature to get access to a child directive?

Get reference to a directive used in a component

In MongoDB, is it possible to dump a database and restore the content to a different database? For example like this:

    mongodump --db db1 --out dumpdir
    mongorestore --db db2 --dir dumpdir

But it doesn&#39;t work. Here&#39;s the error message:

&gt;   building a list of collections to restore from dumpdir dir
&gt;
&gt;   don&#39;t know what to do with subdirectory &quot;dumpdir/db1&quot;, skipping...
&gt;
&gt;   done


Mongorestore to a different database

In Xcode, we have to configure many paths in the **Build Settings**, then we will deal with the **$(SRCROOT)** and **$(PROJECT_DIR)** , But what the difference between them, can you show me an example, thx a lot.

What the different between SRCROOT and PROJECT_DIR?

In Xcode, we have to configure many paths in the Build Settings, then we will deal with the $(SRCROOT) and $(PROJECT_DIR) , But what the difference between them, can you show me an example, thx a lot.

I have a protocol RequestType and it has associatedType Model as below.

    public protocol RequestType: class {
    
        associatedtype Model
        var path: String { get set }
           
    }

    public extension RequestType {
        
        public func executeRequest(completionHandler: Result&lt;Model, NSError&gt; -&gt; Void) {
            request.response(rootKeyPath: rootKeyPath) { [weak self] (response: Response&lt;Model, NSError&gt;) -&gt; Void in
                completionHandler(response.result)
                guard let weakSelf = self else { return }
                if weakSelf.logging { debugPrint(response) }
            }
        }
        
    }

Now I am trying to make a queue of all failed requests.

    public class RequestEventuallyQueue {
        
        static let requestEventuallyQueue = RequestEventuallyQueue()
        let queue = [RequestType]()
        
    }

But I get the error on line `let queue = [RequestType]()` that Protocol RequestType can only be used as a generic constraint because it has Self or associatedType requirements.


Protocol can only be used as a generic constraint because it has Self or associatedType requirements

I need to download the dSYM file so, as I usually do, I went to iTunes connect -&gt; My app -&gt; Activity -&gt; All builds -&gt; latest version. 

&quot;Include symbols&quot; is Yes, but there is no link to download the dSYM file. 

The app was uploaded 3 weeks ago, so also it&#39;s not like it&#39;s processing. Am I missing something stupid? Any idea?

[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/FPRf2.png

Can&#39;t download dSYM file from iTunes connect

I have a `UILabel` I&#39;ve made programmatically as:

    var label = UILabel()

I&#39;ve then declared some styling for the label, including a font, such as:

    label.frame = CGRect(x: 20, y: myHeaderView.frame.height / 2, width: 300, height: 30)
    label.font = UIFont(name: &quot;Typo GeoSlab Regular Demo&quot;, size: 15)
    label.textColor = UIColor(hue: 0/360, saturation: 0/100, brightness: 91/100, alpha: 1)

The first part of the label will always read : `&quot;Filter:&quot;` then followed by another part of the string, for example, &quot;Most popular&quot; 

I would like the word filter to be in bold, so the whole thing would look like:

**Filter:** Most popular

I want to simplest way of creating this effect. I&#39;ve been searching the internet for how to achieve this and there are so many ways, some which just look like pages of code. And most of it seems to be in Objective-C. I would like it in Swift please :)

I don&#39;t know if i&#39;m on the right lines, but is this what `NSRange` can help achieve? Thanks in advance

**Update**

I use a series of `if` statements to change my `label` variable. Such as:

    if indexArray == 1 {

        label.text = &quot;Filter: Film name&quot;
                
    } else if indexArray == 2 {
                
        label.text = &quot;Filter: Most popular&quot;
                
    } else if indexArray == 3 {
                
        label.text = &quot;Filter: Star rating&quot;
                
    }

Make part of a UILabel bold in Swift

I&#39;m working on a project for iOS and I&#39;m doing the programming with Visual Studios and it connects to a mac server using Xamarin. I recently tried to add more views to the storyboard and an additional class. When I tried to build the code, I received this error. http://pastebin.com/Ub5s89aa This is what the output from the console. http://pastebin.com/fhWDy2cJ

I don&#39;t know what this error means and when I tried to look up any part of the error, nothing helped. I cleaned my builded and tried to rebuild, and I also closed Visual Studios and reopen it to see if that help, but it didn&#39;t. Has anyone else had this problem before?

Failed to find or create execution context for description &lt;IBCocoaTouchPlatformToolDescription: 0x7fa8bad9a6f0&gt;

What is the Swift equivalent of Java `toString()` to print the state of a class instance?

Swift equivalent of Java toString()

I am trying to install `fastlane`. I have Xcode installed. I installed `fastlane` using the command `sudo gem install fastlane`. I now go into my project folder and type `fastlane init` and get the error: 

&gt; -bash: fastlane: command not found.

I see that `fastlane` is installed and can see it here

&gt;/Users/username/.gem/ruby/2.0.0/gems/fastlane-1.70.0/bin

on my Mac.
 
I tried adding this to my `PATH`, but I still get the same error.  My path is

&gt;/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:./Users/username/.gem/ruby/2.0.0/gems/

What am I missing here? 

Fastlane command not found

I am just starting out with React-native and have a pretty decent grasp on React for creating web apps... I am running into a confusing issue here that never occured when working with react for the web.

Basically I am rendering a component whose image is being dynamically generated by mapping over an array of objects in its parent component.

    export default class ImageComponent extends React.Component {
      render() {
        return (
            &lt;Image source={this.props.source}/&gt;
        );
      }
    };

And its parent component:

    export default class MainComponent extends React.Component {
      constructor(props) {
        super(props);
       this.state = {
          images:[
            { src: &#39;./src/images/1.png&#39;},
            { src: &#39;/src/images/2.png&#39;},
            { src: &#39;./src/images/3.png&#39;}
          ]
        }
       }
    
      render() {
        let images = this.state.images.map((image) =&gt; {
          return(&lt;ImageComponent source={image.src}  /&gt;);
        })
    
        return (
          &lt;View&gt;
            {images}
          &lt;/View&gt;
        );
      }
    };
&lt;b&gt;
In device simulator I am getting the following error:

&quot;Warning: Failed propType:Invalid prop &#39;source&#39; supplied to &#39;Image&#39; check the render method of &#39;BasicComponent&#39;&quot;
&lt;/b&gt;

Does anyone know what could be going on here?


React-native failed propType on Image component

I&#39;m trying to generate a UItest in Xcode. When I try to swipe UIview I get 
an error:

    Timestamped Event Matching Error: Failed to find matching element

[error window][1]

[![enter image description here][2]][2]

This also happens if I try to tap UIView.


  [1]: http://i.stack.imgur.com/bGlWq.png
  [2]: https://i.stack.imgur.com/bGlWq.png

Timestamped Event Matching Error: Failed to find matching element

I&#39;m trying to get an image to display as the launch screen from my Launch Screen.storyboard file, however the image never displays. I have labels that show up fine, but the image doesn&#39;t appear.

This is how the launch screen looks in the Launch Screen.storyboard file: 
[![enter image description here][1]][1]


However when I run the app on the simulator (as well as on the physical device) this is what shows up:

[![enter image description here][2]][2]

As you can see, the label &quot;Test&quot; shows up fine, however the image does not display. I&#39;m really not sure why this is happening and nothing I try seems to work. If anyone has any ideas of how to fix this it would be greatly appreciated. 


  [1]: http://i.stack.imgur.com/Vjy5B.png
  [2]: http://i.stack.imgur.com/kjUeh.png

Launch Screen storyboard not displaying image

A while ago I started coding a new iOS app. After a long break from it, I&#39;m working on it again and have it almost complete.

I tested it on the simulator but when I tried to install it on my iPhone 6 (something I have already done in the past), I got an error telling me that my app cannot be installed since the certificate that was used to sign this app expired or has been revoked.

I tried many things:

 1. I deleted all certificates and provisioning profiles from Xcode, keychain, and apple developer and let Xcode create me new ones
 2. I deleted Xcode and did the whole process from the beginning

But this didn&#39;t fix my issue.

Any idea what might be the problem?

Certificate has either expired or has been revoked

I have a package.json with following (simplified) content in the scripts key:

    ...
    scripts: {
       &quot;start&quot;: &quot;NODE_ENV=${NODE_ENV:=production} node start-app.js&quot;,
	   &quot;poststart&quot;: &quot;echo $NODE_ENV&quot;
    }
    ...

From the command line I can run:

    npm start

This will run my start-app.js script and set the process.env.NODE_ENV  environment variable to &quot;production&quot;. See [here][1] for syntax explanation.

The poststart will automatically run after start as described [here][2].

However poststart will not &quot;inherit&quot; the NODE_ENV shell environment variable, so the echo command will not echo anything.

My producation code is a little more complex, but what I am trying to accomplish is passing down the NODE_ENV variable from the &quot;starting point&quot; to dependent scripts. Any suggestions/best practices on how to do that?

I dont want to hardcode the NODE_ENV in the poststart, because I might want to do:
     
    NODE_ENV=development npm start
and I want everyting &quot;down the chain&quot; inherit the same environment.

  [1]: https://stackoverflow.com/a/2013589/228450
  [2]: https://docs.npmjs.com/misc/scripts &quot;here&quot;

Passing environment variables in npm-scripts

I want to &quot;activate&quot; a virtualenv in a systemd service file.

I would like to avoid having a shell process between the systemd process and the python interpreter.

My current solution looks like this:


    [Unit]
    Description=fooservice
    After=syslog.target network.target
    
    [Service]
    Type=simple
    User=fooservice
    WorkingDirectory={{ venv_home }}
    ExecStart={{ venv_home }}/fooservice --serve-in-foreground
    Restart=on-abort
    EnvironmentFile=/etc/sysconfig/fooservice.env
    
    [Install]
    WantedBy=multi-user.target

/etc/sysconfig/fooservice.env



    PATH={{ venv_home }}/bin:/usr/local/bin:/usr/bin:/bin
    PYTHONIOENCODING=utf-8
    PYTHONPATH={{ venv_home }}/...
    VIRTUAL_ENV={{ venv_home }}

But I am having trouble. I get ImportErrors since some entries in `sys.path` are missing.


How to enable a virtualenv in a systemd service unit?

I&#39;ve a problem that Jupyter can&#39;t see env variable in bashrc file, is there a way to load these variables in jupyter or add custome variable to it?

How to set env variable in Jupyter notebook

I have two GPUs and would like to run two different networks via ipynb simultaneously, however the first notebook always allocates both GPUs. 

Using CUDA_VISIBLE_DEVICES, I can hide devices for python files, however I am unsure of how to do so within a notebook.

Is there anyway to hide different GPUs in to notebooks running on the same server?

Tensorflow set CUDA_VISIBLE_DEVICES within jupyter

I need to display all configured environment variables in a PowerShell script at runtime. Normally when displaying environment variables I can just use one of the following at the shell (among other techniques, but these are simple):

    gci env:*
    ls Env:

However, I have a script being called from another program, and when I use one of the above calls in the script, instead of being presented with environment variables and their values, I instead get a list of `System.Collections.DictionaryEntry` types instead of the variables and their values. Inside of a PowerShell script, how can I display all environment variables?


Content Type	Original Author	Original Content on Stackoverflow
Question	childrenOurFuture	View Question on Stackoverflow
Solution 1 - Ios	SwiftArchitect	View Answer on Stackoverflow
Solution 2 - Ios	Baig	View Answer on Stackoverflow
Solution 3 - Ios	Paresh Mangukiya	View Answer on Stackoverflow

What the different between SRCROOT and PROJECT_DIR?

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

Solution 3 - Ios

Mongorestore to a different database

Get reference to a directive used in a component

Attributions