**As of now this is only for Debugging on iOS device, not Simulator**

Xcode 8 could not support unless you have the DeviceSupport folder for the iOS 11 version.

1. You can download a Xcode 9 beta (latest Xcode 9) or get an DeviceSupport folder from other user.

2. Simply copy it to your folder or create an symbolic link

`sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0\ \(15A372\) /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0`

reference: https://stackoverflow.com/questions/37945376/use-xcode-7-with-ios-10

Check this out: **As of now this is only for Debugging on iOS device not Simulator**



1. Download the SDK [from Apple][1]
2. Copy this **iOS 11.0 image** file to: **/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/**
3. Restart Xcode.


  [1]: https://developer.apple.com/download/

I did this and it&#39;s fine, I still work both on comercial app using Xcode 8 + Swift 3 and exploring Xcode 9 beta with Swift 4. Just download the Xcode 9 and, inside Xcode 8 preferences, set the Command Line Tools to use the 9.0.

[![Xcode Preferences &gt; Locations][1]][1]


  [1]: https://i.stack.imgur.com/U8iNH.png

I preferred to copy ALL the folder:

    /Volumes/**HighSierra**/Applications/Xcode-**beta.app**/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/11.0\ \(15A5278f\)

to:

     /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/**11** 


I can confirm I can run on my iPhone 7 with iOS 11



I&#39;m trying to find the best way to Encode/Decode an array of structs conforming to a swift protocol using the new JSONDecoder/Encoder in Swift 4.

I made up a little example to illustrate the problem:

First we have a protocol Tag and some Types that conform to this protocol.

    protocol Tag: Codable {
        var type: String { get }
        var value: String { get }
    }
    
    struct AuthorTag: Tag {
        let type = &quot;author&quot;
        let value: String
    }
    
    struct GenreTag: Tag {
        let type = &quot;genre&quot;
        let value: String
    }


Then we have a Type Article which has an Array of Tags.


    struct Article: Codable {
        let tags: [Tag]
        let title: String
    }

Finally we encode or decode the Article 


    let article = Article(tags: [AuthorTag(value: &quot;Author Tag Value&quot;), GenreTag(value:&quot;Genre Tag Value&quot;)], title: &quot;Article Title&quot;)
    
    
    let jsonEncoder = JSONEncoder()
    let jsonData = try jsonEncoder.encode(article)
    let jsonString = String(data: jsonData, encoding: .utf8)
    
And this is the JSON structure that I like to have.

    {
     &quot;title&quot;: &quot;Article Title&quot;,
     &quot;tags&quot;: [
         {
           &quot;type&quot;: &quot;author&quot;,
           &quot;value&quot;: &quot;Author Tag Value&quot;
         },
         {
           &quot;type&quot;: &quot;genre&quot;,
           &quot;value&quot;: &quot;Genre Tag Value&quot;
         }
     ]
    }

The problem is that at some point I have to switch on the type property to decode the Array but to Decode the Array I have to know its type.

**EDIT:**

It&#39;s clear to me why Decodable can not work out of the box but at least Encodable should work. The following modified Article struct compiles but crashes with the following error message.

    fatal error: Array&lt;Tag&gt; does not conform to Encodable because Tag does not conform to Encodable.: file /Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-900.0.43/src/swift/stdlib/public/core/Codable.swift, line 3280

    struct Article: Encodable {
        let tags: [Tag]
        let title: String
        
        enum CodingKeys: String, CodingKey {
            case tags
            case title
        }
        
        func encode(to encoder: Encoder) throws {
            var container = encoder.container(keyedBy: CodingKeys.self)
            try container.encode(tags, forKey: .tags)
            try container.encode(title, forKey: .title)
        }
    }
    
    let article = Article(tags: [AuthorTag(value: &quot;Author Tag&quot;), GenreTag(value:&quot;A Genre Tag&quot;)], title: &quot;A Title&quot;)
    
    let jsonEncoder = JSONEncoder()
    let jsonData = try jsonEncoder.encode(article)
    let jsonString = String(data: jsonData, encoding: .utf8)

And this is the relevant part from Codeable.swift

    guard Element.self is Encodable.Type else {
        preconditionFailure(&quot;\(type(of: self)) does not conform to Encodable because \(Element.self) does not conform to Encodable.&quot;)
    }

Source: https://github.com/apple/swift/blob/master/stdlib/public/core/Codable.swift

Encode/Decode Array of Types conforming to protocol with JSONEncoder

I have following case: there is a list of objects - ProductData which contains several fields:

    public class ProductData
    {
    ....
      private String name;
      private String xref;
      
      //getters
      //setters
    }


and there is API which returns list of following objects:


    public class RatingTableRow
    {
      private String planName;
      private String planXref;
      private int fromAge;
      private int toAge;
      private int ratingRegion;

     //constructor
     //getters
     //setters

    }


but it returns objects with empty plan name field because it&#39;s not allowed during extraction of this object. I need to link product data with RatingTableRow by the xref in order to set plan name into the RatingTableRow because I need to use this object later so I created following code to do that:


      
    Map&lt;String, ProductData&gt; productByXref = plans.stream()
            .collect(toMap(ProductData::getInternalCode, Function.identity()));
          
    return getRatingTableRows(...).stream
            .filter(ratingRow -&gt; productByXref.containsKey(ratingRow.getPlanXref()))
            .peek(row -&gt; {
                    ProductData product = productByXref.get(row.getPlanXref());
                    row.setPlanName(product.getName());
            })....;


I know that java docs say that `peek` doesn&#39;t fit these needs but want to get your suggestions on how to make this task in more correct way.

Java 8 peek vs map

I want to use Xcode 8 with iOS 11.

 should I upgrade my Xcode. However, my code can&#39;t be built by the new compiler, so I want to stay with Xcode 8.

[![enter image description here][1]][1]

How can I achieve that?

**Apple revealed several new iOS 11 features at WWDC 2017.** 


  [1]: https://i.stack.imgur.com/l84Gj.png

Use Xcode 8 with iOS 11

I want to use Xcode 8 with iOS 11.
should I upgrade my Xcode. However, my code can't be built by the new compiler, so I want to stay with Xcode 8.
<a href="https://i.stack.imgur.com/l84Gj.png" target="_blank" rel="noopener noreferrer"><img src="https://i.stack.imgur.com/l84Gj.png" alt="enter image description here"></a>
How can I achieve that?
Apple revealed several new iOS 11 features at WWDC 2017.

Wireless debugging was recently added as a feature in Xcode 9, iOS 11, and tvOS 11. Apple TV 4K doesn&#39;t have a USB port, so it requires wireless debugging. How do you perform this wireless debugging in Xcode?

How do you perform wireless debugging in Xcode 9 with iOS 11, Apple TV 4K, etc?

Now in iOS 11, the `sizeThatFits` method is not called from `UINavigationBar` subclasses. Changing the frame of `UINavigationBar` causes glitches and wrong insets.
So, any ideas how to customize navbar height now?

iOS 11 navigation bar height customizing

I just started compiling up to iOS 11 and noticed that Apple now declared the property

    var automaticallyAdjustsScrollViewInsets: Bool { get set }

as being deprecated:

https://developer.apple.com/documentation/uikit/uiviewcontroller/1621372-automaticallyadjustsscrollviewin

[![enter image description here][1]][1]

Is there another property to fix this warning in iOS 11?

Will the default value stay true or how will this be handled in future?


  [1]: https://i.stack.imgur.com/U6a9K.png

&#39;automaticallyAdjustsScrollViewInsets&#39; was deprecated in iOS 11.0

Xcode 9 (iOS 11) showing me an error/warning while registering for Push (remote) notification.

Here is error message

[![enter image description here][1]][1]

And here is code, I&#39;ve tried:

    let center  = UNUserNotificationCenter.current()
    center.delegate = self
    center.requestAuthorization(options: [.sound, .alert, .badge]) { (granted, error) in
            if error == nil{
                  UIApplication.shared.registerForRemoteNotifications()
            }
     }

**Error/Warning Line:**

&gt; UIApplication.shared.registerForRemoteNotifications()

How to resolve this?


  [1]: https://i.stack.imgur.com/GY0iw.png

UIApplication.registerForRemoteNotifications() must be called from main thread only

After updating to Xcode 9, I tried to build one of my projects.

I use the **FacebookLogin** pod.
I have a compiler error in FacebookLogin/LoginButton.swift

    @testable import FacebookCore
    ❌ Module compiled with Swift 3.1 cannot be imported in Swift 4.0

In my target&#39;s build settings, the Swift language version is set to **Swift 3.2**.

[![Screenshot added][1]][1]

I guess I need to wait for Facebook to update their pod ? Or any other suggestion ?

Thanks !


  [1]: https://i.stack.imgur.com/6jYoK.png

Xcode 9 : Module compiled with Swift 3.1 cannot be imported in Swift 4.0

I do not have Apple Developer Premium Account and I need Xcode Beta (recent major release of Application Development tool by Apple).

How can I download Xcode (beta) version without Premium Apple Developer Account?

Is there any way that I can get the Xcode beta or stable release? 


Download &amp; Install Xcode version without Premium Developer Account

I&#39;m trying to convert my project&#39;s source code from Swift 3 to Swift 4. One warning Xcode is giving me is about my selectors.

For instance, I add a target to a button using a regular selector like this:

    button.addTarget(self, action: #selector(self.myAction), for: .touchUpInside)

This is the warning it shows:

&gt;Argument of &#39;#selector&#39; refers to instance method &#39;myAction()&#39; in &#39;ViewController&#39; that depends on &#39;@objc&#39; attribute inference deprecated in Swift 4
&gt;
&gt; Add &#39;@objc&#39; to expose this instance method to Objective-C

Now, hitting `Fix` on the error message does this to my function:

    // before
    func myAction() { /* ... */ }

    // after
    @objc func myAction() { /* ... */ }

I don&#39;t really want to rename all of my functions to include the `@objc` mark and I&#39;m assuming that&#39;s not necessary.

How do I rewrite the selector to deal with the deprecation?

---

**Related question:**

- https://stackoverflow.com/questions/44379348/the-use-of-swift-3-objc-inference-in-swift-4-mode-is-deprecated

How can I deal with @objc inference deprecation with #selector() in Swift 4?

I am having trouble finding the menu item to switch branch using Xcode 9. The working copies menu seems to have disappeared. Any ideas?

**Xcode 9**

[![enter image description here][1]][1]


**Xcode 8**

[![enter image description here][2]][2]


  [1]: https://i.stack.imgur.com/5hCA7.png
  [2]: https://i.stack.imgur.com/u1YUt.png

Switching branch on Xcode 9

I usually use custom UIColors on iOS using extensions with Swift, but now with iOS 11/ Xcode 9 we can create Colors Sets. How can we use them?

**Update - Tip**

As @Cœur says we can drag&amp;drop de color, and use it like a UIColor object and a possible solution could be use it as a extension:

[![UIColor as an extension][1]][1] 

 Or as a constant:

[![UIColor as a constant][2]][2]

Now I wanna know if we can access them like an UIImage access to an Asset Image or not, like:

    UIImage(named: &quot;image-name&quot;) -&gt; UIColor(named: &quot;color-name&quot;)
    


  [1]: https://i.stack.imgur.com/2bJpe.png
  [2]: https://i.stack.imgur.com/3cpV9.png

How can we use Assets Catalog Color Sets?

iOS 11 Beta 1 uses the increased navigation-bar title for almost all system-apps (it started doing this in iOS 10 and the Music app). I am wondering if Apple has a public API for this coming in iOS 11, or whether it will stay private for now. 

The behavior is that the title has an increased font-size, is left aligned and will move to the navigation-bar once the user scrolls down. I&#39;ve attached some screens showing this behavior in the Messages app here:

[![enter image description here][1]][1]

Although I could not find any reference in the `UINavigationController` and `UINavigationBar` so far, maybe someone knows some more details!


  [1]: https://i.stack.imgur.com/vOITO.png

Use the increased navigation-bar title in iOS 11

I just rebuilt my app with the iOS 11 SDK in an attempt to remove the `blue banner` that is now always appearing. I thought - &quot;Brilliant, that worked&quot;, only to discover that location services are now not working at all.

The application used to work with iOS 10 - Has anybody heard anything? 

Content Type	Original Author	Original Content on Stackoverflow
Question	Nazmul Hasan	View Question on Stackoverflow
Solution 1 - Ios	yudun1989	View Answer on Stackoverflow
Solution 2 - Ios	Sour LeangChhean	View Answer on Stackoverflow
Solution 3 - Ios	Daniel Bonates	View Answer on Stackoverflow
Solution 4 - Ios	ingconti	View Answer on Stackoverflow

Use Xcode 8 with iOS 11

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

Solution 3 - Ios

Solution 4 - Ios

Java 8 peek vs map

Encode/Decode Array of Types conforming to protocol with JSONEncoder

Attributions