1. Select the Xcode project in the lefthand browser.
2. Click on your test target in the Project&#39;s General tab.
3. Under &quot;General&quot; select your appropriate host application under &quot;Testing&quot;.

I am trying to test my route resolver and while testing I got `TypeError: ctor is not a constructor` and no idea why it happen while typescript compile time no error.

    TypeError: ctor is not a constructor
    TypeError: ctor is not a constructor
        at _createClass (http://localhost:9877/_karma_webpack_/vendor.bundle.js:42355:26)
        at _createProviderInstance$1 (http://localhost:9877/_karma_webpack_/vendor.bundle.js:42330:26)
        at resolveNgModuleDep (http://localhost:9877/_karma_webpack_/vendor.bundle.js:42315:17)
        at _createClass (http://localhost:9877/_karma_webpack_/vendor.bundle.js:42362:26)
        at _createProviderInstance$1 (http://localhost:9877/_karma_webpack_/vendor.bundle.js:42330:26)
        at resolveNgModuleDep (http://localhost:9877/_karma_webpack_/vendor.bundle.js:42315:17)
        at NgModuleRef_.webpackJsonp../node_modules/@angular/core/@angular/core.es5.js.NgModuleRef_.get (http://localhost:9877/_karma_webpack_/vendor.bundle.js:43401:16)
        at TestBed.webpackJsonp../node_modules/@angular/core/@angular/core/testing.es5.js.TestBed.get (http://localhost:9877/_karma_webpack_/vendor.bundle.js:48412:47)
        at http://localhost:9877/_karma_webpack_/vendor.bundle.js:48418:61
        at Array.map (native)

angular 4 unit testing error `TypeError: ctor is not a constructor`

I&#39;ve been testing my React.js application on internet explorer, and finding that some ES6/7 code like `Array.prototype.includes()` breaks it. 

I&#39;m using [create-react-app][1], and apparently they&#39;ve chosen not to include a lot of polyfills since not everyone needs them, and they slow down build times (see for example [here][2] and [here][3]). The documentation (at time of writing) suggests:

&gt; If you use any other ES6+ features that need runtime support (such as
&gt; Array.from() or Symbol), make sure you are including the appropriate
&gt; polyfills manually, or that the browsers you are targeting already
&gt; support them.

So... **what is the best way to &#39;manually&#39; include them?** 

  [1]: https://github.com/facebookincubator/create-react-app
  [2]: https://github.com/facebookincubator/create-react-app/issues/942
  [3]: https://github.com/facebook/create-react-app/issues/914#issuecomment-255336818

Best way to polyfill ES6 features in React app that uses create-react-app

I am receiving an error message when I try to use Xcode 8&#39;s Convert Wizard. After trying install KIF Framework.

Here is the error message:

&gt;Could not find test host for PresentrTests: TEST_HOST evaluates to &quot;/Users/mymacbook/Library/Developer/Xcode/DerivedData/MyApplication-akrziiobrmqfliboqlgonjeyvquu/Build/Products/Debug-iphoneos/MyApplication.xctest/MyApplication&quot;


Xcode - Could not find test host

I am receiving an error message when I try to use Xcode 8's Convert Wizard. After trying install KIF Framework.
Here is the error message:
>Could not find test host for PresentrTests: TEST_HOST evaluates to "/Users/mymacbook/Library/Developer/Xcode/DerivedData/MyApplication-akrziiobrmqfliboqlgonjeyvquu/Build/Products/Debug-iphoneos/MyApplication.xctest/MyApplication"

After installing Xcode 9 beta, Xcode 8 gives me an error when compiling a project:
 
&gt;Cannot find cdtool at &#39;/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Agents/cdtool&#39;: Cannot find a simulator runtime for platform `&lt;DVTPlatform:0x7fd67af0a930:&#39;com.apple.platform.iphonesimulator&#39;:&lt;DVTFilePath:0x7fd67af0a7c0:&#39;/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform&#39;&gt;&gt;`.
 
I suspect Xcode 9 modified some shared state with Xcode 8 (set a path, overwrote a file, etc.). But I&#39;ve tried deleting and both Xcodes to no avail.
 
The project uses Core Data and it&#39;s clearly failing when trying to compile the xcdatamodel.
 
I can still compile and run under Xcode 9.


Xcode 9 Bug: Cannot find cdtool

When using Xcode 9, there are some compiler warnings saying `This function declaration is not a prototype`. It suggests to add `void` to the method body, which will resolve it. The issue I am having is that those warnings are also thrown for system-API&#39;s like `UIApplication` delegate-methods:

    - (void)application:(UIApplication *)application
        handleActionWithIdentifier:(NSString *)identifier
             forRemoteNotification:(NSDictionary *)userInfo
                  withResponseInfo:(NSDictionary *)responseInfo
                 completionHandler:(void (^)())completionHandler

This could be resolved by the following:

    - (void)application:(UIApplication *)application
        handleActionWithIdentifier:(NSString *)identifier
             forRemoteNotification:(NSDictionary *)userInfo
                  withResponseInfo:(NSDictionary *)responseInfo
                 completionHandler:(void (^)(void))completionHandler


Now I am wondering if the delegate methods will still work on the long-term or Apple will insert the `void` in later iOS 11 Beta versions. I am curious because if I include the `void` body, Xcode will complain about mismatching method-selectors (which makes sense). Did someone experience the same issue so far? 

&quot;This function declaration is not a prototype&quot; warning in Xcode 9

I have a prototype ready to go and the project is jammed with build:
&gt; error: Can&#39;t find &#39;node&#39; binary to build React Native bundle If you
&gt; have non-standard nodejs installation, select your project in Xcode,
&gt; find &#39;Build Phases&#39; - &#39;Bundle React Native code and images&#39; and change
&gt; NODE_BINARY to absolute path to your node executable (you can find it
&gt; by invoking &#39;which node&#39; in the terminal)

this feedback is helpless for me, i do have node with nvm. is this something related to bash?

React Native ios build : Can&#39;t find node

While exploring **Xcode9 Beta** Found **Safe Area** on Interface builders View hierarchy viewer. Got curious and tried to know about Safe Area on Apples documentation, in gist the doc says *&quot;The the view area which directly interacts with Auto layout&quot;* But it did not satisfy me, I want to know Practical use of this new thing. 

Do any one have some clue? 

[![enter image description here][1]][1]

**Conclusion paragraph from Apple doc for Safe area.**

&gt;The UILayoutGuide class is designed to perform all the tasks previously performed by dummy views, but to do it in a safer, more efficient manner. Layout guides do not define a new view. They do not participate in the view hierarchy. Instead, they simply define a rectangular region in their owning view’s coordinate system that can interact with Auto Layout.


  [1]: https://i.stack.imgur.com/qif1w.png

Safe Area of Xcode 9

In previous Xcode version , I could jump to definition with simple 
**Cmd + click** on that method/variable . 
But in Xcode 9, I feel uncomfortable to jump to definition . 

Does anyone has a better solution for jumping to definition in Xcode 9 ?

I am tired of selecting options from dropdown list.

iOS - Shortcut for jumping to definition in Xcode 9?

I&#39;m trying to display an image from the photo library in a UIImageView

The full error is:

&gt; 2017-06-09 21:55:59.063307+0200 firstapp2.0[12873:1120778] PhotoPicker
&gt; discovery error: Error Domain=PlugInKit Code=13 &quot;query cancelled&quot;
&gt; UserInfo={NSLocalizedDescription=query cancelled}

My code is included below: 

    import UIKit

    class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate{
        
        @IBOutlet weak var pic: UIImageView!
        @IBOutlet weak var text: UILabel!
    
        var chosenImage : UIImage!
        
        override func viewDidLoad() {
            super.viewDidLoad()        
            pic.isUserInteractionEnabled = true;
        }
    
        override func didReceiveMemoryWarning() {
            super.didReceiveMemoryWarning()
            // Dispose of any resources that can be recreated.
        }
    
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [AnyHashable: Any]) {
            var chosenImage = info[UIImagePickerControllerEditedImage]
            self.pic!.image = chosenImage as! UIImage
            picker.dismiss(animated: true, completion: nil)
        }
    
        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            picker.dismiss(animated: true, completion: nil)
        }
        
        @IBAction func tap(_ sender: Any) {        
            self.text.text = &quot;Kreason&quot;
            let imagePicker = UIImagePickerController()    
            imagePicker.delegate = self        
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            imagePicker.allowsEditing = false    
            self.present(imagePicker, animated: true, completion: nil)
        }
    }






PhotoPicker discovery error: Error Domain=PlugInKit Code=13

Here is my JSON

    {
        &quot;id&quot;: 1,
        &quot;user&quot;: {
            &quot;user_name&quot;: &quot;Tester&quot;,
            &quot;real_info&quot;: {
             	&quot;full_name&quot;:&quot;Jon Doe&quot;
            }
        },
        &quot;reviews_count&quot;: [
            {
                &quot;count&quot;: 4
            }
        ]
    }
    

Here is the structure I want it saved to (incomplete)

    struct ServerResponse: Decodable {
    	var id: String
    	var username: String
    	var fullName: String
    	var reviewCount: Int
    	
    	enum CodingKeys: String, CodingKey {
           case id, 
	       // How do i get nested values?
    	}
    }

I have looked at [Apple&#39;s Documentation][1] on decoding nested structs, but I still do not understand how to do the different levels of the JSON properly. Any help will be much appreciated.


  [1]: https://developer.apple.com/documentation/foundation/archives_and_serialization/encoding_and_decoding_custom_types

How to decode a nested JSON struct with Swift Decodable protocol?

Should the use of class inheritance break the Decodability of class.  For example, the following code 



    class Server : Codable {
        var id : Int?
    }

    class Development : Server {
        var name : String?
        var userId : Int?
    }

    var json = &quot;{\&quot;id\&quot; : 1,\&quot;name\&quot; : \&quot;Large Building Development\&quot;}&quot;
    let jsonDecoder = JSONDecoder()
    let item = try jsonDecoder.decode(Development.self, from:json.data(using: .utf8)!) as Development

    print(item.id ?? &quot;id is nil&quot;)
    print(item.name ?? &quot;name is nil&quot;) here


output is: 


    1
    name is nil



Now if I reverse this, name decodes but id does not.

    class Server {
        var id : Int?
    }

    class Development : Server, Codable {
        var name : String?
        var userId : Int?
    }

    var json = &quot;{\&quot;id\&quot; : 1,\&quot;name\&quot; : \&quot;Large Building Development\&quot;}&quot;
    let jsonDecoder = JSONDecoder()
    let item = try jsonDecoder.decode(Development.self, from:json.data(using: .utf8)!) as Development

    print(item.id ?? &quot;id is nil&quot;)
    print(item.name ?? &quot;name is nil&quot;)

output is:

    id is nil
    Large Building Development


And you can&#39;t express Codable in both classes. 

Using Decodable in Swift 4 with Inheritance

Swift 4 added the new `Codable` protocol. When I use `JSONDecoder` it seems to require all the non-optional properties of my `Codable` class to have keys in the JSON or it throws an error.

Making every property of my class optional seems like an unnecessary hassle since what I really want is to use the value in the json or a default value. (I don&#39;t want the property to be nil.)

Is there a way to do this?

    class MyCodable: Codable {
        var name: String = &quot;Default Appleseed&quot;
    }

    func load(input: String) {
        do {
            if let data = input.data(using: .utf8) {
                let result = try JSONDecoder().decode(MyCodable.self, from: data)
                print(&quot;name: \(result.name)&quot;)
            }
        } catch  {
            print(&quot;error: \(error)&quot;)
            // `Error message: &quot;Key not found when expecting non-optional type
            // String for coding key \&quot;name\&quot;&quot;`
        }
    }

    let goodInput = &quot;{\&quot;name\&quot;: \&quot;Jonny Appleseed\&quot; }&quot;
    let badInput = &quot;{}&quot;
    load(input: goodInput) // works, `name` is Jonny Applessed
    load(input: badInput) // breaks, `name` required since property is non-optional


With JSONDecoder in Swift 4, can missing keys use a default value instead of having to be optional properties?

When trying to submit my app, iTunes Connect says

&gt; Missing Marketing Icon. iOS Apps must include a 1024x1024px Marketing Icon in PNG format. Apps that do not include the Marketing Icon cannot be submitted for App Review or Beta App Review.


I do have a 1024x1024px PNG in my submission in iTunes Connect, under `General App Information` and `App Icon`. So I guess they want me to add it as an Asset to the bundle, in Xcode. But when I drag and drop my PNG to this `Unassigned` placeholder, nothing happens.

[![Unassigned placeholder for Marketing 1024x PNG][1]][1]

  [1]: https://i.stack.imgur.com/SeYI7.png

This error started appearing after WWDC 2017 and I installed XCode 9 Beta. This issue is occuring in Version 8.3.1 (8E1000a) too though.

Missing Marketing Icon

I&#39;ve been facing an issue (frequently) with the recent major release of the iOS application development tool - Xcode 9-beta.

It&#39;s showing me the following error frequently while running/debugging app in Simulator (iOS 11).

&gt; **Could not attach to pid : “2370”**
&gt; &lt;br&gt;Ensure &lt;*project title*&gt; is not already running, and &lt;*system username*&gt; has permission to debug it.

Here is a snapshot for the same issue:

[![error message - Could not attach to pid][1]][1]

What would be permanent solution of this issue, as it&#39;s disturbing frequently?

  [1]: https://i.stack.imgur.com/ubQMW.png

Xcode 9: Could not attach to pid

Where are the Provisioning Profiles located in Xcode 8.3.3 within the project and/or file directory?  



Xcode Provisioning Profiles Location

When trying to upload an App to iTunes connect in Xcode 8.3.3, I get the error:

&gt; iTunes Connect access for &quot;Team-Name&quot; is required. Add an account in the  Accounts preference plane.

[![Screenshot][1]][1]


The account already exists and (in some cases) has been working without incident previously.  

How do I get around this issue with Xcode so that I can upload my app to the AppStore?

  [1]: https://i.stack.imgur.com/6rkHm.png

Content Type	Original Author	Original Content on Stackoverflow
Question	Irwan Madness	View Question on Stackoverflow
Solution 1 - Ios	spfursich	View Answer on Stackoverflow

Xcode - Could not find test host

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Best way to polyfill ES6 features in React app that uses create-react-app

angular 4 unit testing error `TypeError: ctor is not a constructor`

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