When updating to Xcode 10, iOS static library target fails to build. Way how I am trying to build it is following:

    xcodebuild -target TargetName -configuration Release clean build

With Xcode 9 everything runs smoothly, but when Xcode 10 is used for build, I am getting following error (after clean runs smoothly):

&gt; note: Using new build system
&gt; 
&gt; note: Planning build
&gt; 
&gt; note: Constructing build description Build system information error:
&gt; unable to attach DB: error: accessing build database
&gt; &quot;/Users/uerceg/random-path/build/XCBuildData/build.db&quot;: database is
&gt; locked Possibly there are two concurrent builds running in the same
&gt; filesystem location.
&gt; 
&gt; ** BUILD FAILED **
&gt; 
&gt; 
&gt; ** BUILD FAILED **
&gt; 
&gt; 
&gt; The following build commands failed: 	PhaseScriptExecution
&gt; MultiPlatform\ Build
&gt; /Users/uerceg/random-path/build/Library.build/Release-iphoneos/LibraryTarget.build/Script-9DE7C9021AE68FA5001556E5.sh
&gt; (1 failure)

This probably unrelated, but I noticed that new Xcode 10 build system flags duplicated `Copy Bundle Resource` Info.plist files as errors, so I did make sure that there&#39;re no duplicated entries, but probably this error is not related to this fact.

Does anyone have any idea what might be wrong?

Xcode 10: unable to attach DB error

In my app i have three screens login , verifyotp , generatepass. I know how to move from one page to other page eg: `Navigator.pushNamed(context, &quot;/theNameOfThePage&quot;);`.
I have a flow in which i move from login-&gt;verifyotp-&gt;generatepass my question is now how can i move from generatepass  to login page and clearing all the stack.
I am an android developer so in android we have `intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);`.
How can i achieve same result in flutter!

Navigator routes Clear the stack of flutter

I have a made a protocol in my VC in which i&#39;m getting the location placemark from one my my swift file class. In my swift class i have declare the protocol like this,

     weak var delegate: HandleMapSearch?
But the xcode is showing me error `&#39;weak&#39; must not be applied to non-class-bound &#39;HandleMapSearch&#39;; consider adding a protocol conformance that has a class bound` . It was working fine before but now when i run the app it shows this error. What is this for and how can i remove this error? This is how i have created protocol in my VC class. 

    protocol HandleMapSearch {
    func dropPinZoomIn(placemark:MKPlacemark)
    }

Weak&#39; must not be applied to non-class-bound consider adding a protocol conformance that has a class bound

I have a made a protocol in my VC in which i'm getting the location placemark from one my my swift file class. In my swift class i have declare the protocol like this,
<pre><code class="hljs language-csharp"> weak var delegate: HandleMapSearch?
</code></pre>
But the xcode is showing me error <code>'weak' must not be applied to non-class-bound 'HandleMapSearch'; consider adding a protocol conformance that has a class bound</code> . It was working fine before but now when i run the app it shows this error. What is this for and how can i remove this error? This is how i have created protocol in my VC class.
<pre><code class="hljs language-swift">protocol HandleMapSearch {
func dropPinZoomIn(placemark:MKPlacemark)
}
</code></pre>

I&#39;m using [Apple&#39;s Swift iOS Tutorial](https://developer.apple.com/library/archive/referencelibrary/GettingStarted/DevelopiOSAppsSwift/WorkWithViewControllers.html#//apple_ref/doc/uid/TP40015214-CH6-SW1). Which is throwing an error,

&gt; Cannot subscript a value of type &#39;[String : Any]&#39; with an index of type &#39;UIImagePickerController.InfoKey&#39;

The function they defined is below.

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    
        // The info dictionary may contain multiple representations of the image. You want to use the original.
        guard let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage else {
            fatalError(&quot;Expected a dictionary containing an image, but was provided the following: \(info)&quot;)
        }
    
        // Set photoImageView to display the selected image.
        photoImageView.image = selectedImage
    
        // Dismiss the picker.
        dismiss(animated: true, completion: nil)
    }

I&#39;m using Xcode Version 10.0 beta 3, which includes Swift 4.2.

I&#39;d like to understand how to traverse the docs to understand what might have changed or broken.

Cannot subscript a value of type &#39;[String : Any]&#39; with an index of type &#39;UIImagePickerController.InfoKey&#39;

Same code like this

    collectionLayout.estimatedItemSize = CGSize(width: 50, height: 25)
    collectionLayout.itemSize = UICollectionViewFlowLayoutAutomaticSize
    collectionLayout.minimumInteritemSpacing = 10 
    
    for _ in 0 ..&lt; 1000 {
        let length = Int(arc4random() % 8)
        let string = randomKeyByBitLength(length)
        array.append(string!)
    }
    collectionView.reloadData()

cell constraints:

[![enter image description here][1]][1]

when I run it on iOS 12, it&#39;s different.
left simulator is iOS 11, and right is iOS 12:

[![enter image description here][2]][2]

But, when I scroll it, cells&#39;s frames will be normal.

---
Sample project to reproduce the issue: https://github.com/Coeur/StackOverflow51375566

  [1]: https://i.stack.imgur.com/jvQpt.jpg
  [2]: https://i.stack.imgur.com/fqAhC.jpg

In iOS 12, when does the UICollectionView layout cells, use autolayout in nib

I am trying to rebuild an ios app, that previously had no issues (first rebuild in 6 months or so). Environment is OSX 10.13.5 with all the latest updates, Xcode 9.4.1, Ionic is 3.20.0. Local cordova, ionic and node modules have been updated.

These plugins:

cordova-plugin-device&lt;br&gt;
cordova-plugin-file&lt;br&gt;
cordova-plugin-file-transfer&lt;br&gt;
cordova-plugin-splashscreen&lt;br&gt;
cordova-plugin-whitelist&lt;br&gt;
cordova-plugin-x-socialsharing

Configured for manual signing. Provisioning profiles have been regenerated, with new certs, downloaded and installed (numerous times).

I cannot make this error go away in either debug or release builds:

&gt; Check dependencies Code Signing Error: No profile for team
&gt; ‘8SEBNER3XM’ matching ‘ABM 2018 Dev’ found: Xcode couldn’t find any
&gt; provisioning profiles matching ‘8SEBNER3XM/ABM 2018 Dev’. Install the
&gt; profile (by dragging and dropping it onto Xcode’s dock item) or select
&gt; a different one in the General tab of the target editor. Code Signing
&gt; Error: Code signing is required for product type ‘Application’ in SDK
&gt; ‘iOS 11.4’
&gt; 
&gt; ** ARCHIVE FAILED **
&gt; 
&gt; The following build commands failed: Check dependencies (1 failure)
&gt; Error: Error code 65 for command: xcodebuild with args:
&gt; -xcconfig,/Users/kerickhowlett/Documents/PhoneProjects/ABM/platforms/ios/cordova/build-debug.xcconfig,-workspace,Cocktail
&gt; Pro.xcworkspace,-scheme,Cocktail
&gt; Pro,-configuration,Debug,-destination,generic/platform=iOS,-archivePath,Cocktail
&gt; Pro.xcarchive,archive,CONFIGURATION_BUILD_DIR=/Users/kerickhowlett/Documents/PhoneProjects/ABM/platforms/ios/build/device,SHARED_PRECOMPS_DIR=/Users/kerickhowlett/Documents/PhoneProjects/ABM/platforms/ios/build/sharedpch

Despite what the message says, there is what seems to be perfectly valid provisioning profiles in both Xcode project General tab, and Build Settings (ie &#39;ABM 2018 Dev&#39;). They match the files in Library/MobileDevice/Provisioning Profiles folder. The team id is verified as correct. The profiles been regenerated / re-installed many times. Xcode thinks they are valid from within Xcode (does not complain). Running as ‘ionic cordova build ios’ seems to have a different opinion, and complains about the profiles. Similar error with --release added to the command. Based on trial and error, it is the PROVISIONING_PROFILE_SPECIFIER that seems to be the issue. I&#39;ve tried a number of variations but always get the same error, which seems bogus. I have tried both profile names and UUID&#39;s. 

What am I missing?

Xcode couldn&#39;t find any provisioning profiles matching

I am trying to display the current `DateTime` in a `Text` widget after tapping on a button. The following works, but I&#39;d like to change the format.

**Current approach**

    DateTime now = DateTime.now();
    currentTime = new DateTime(now.year, now.month, now.day, now.hour, now.minute);
     Text(&#39;$currentTime&#39;), 



**Result**

`YYYY-MM-JJ  HH-MM:00.000`

**Question**

How can I remove the `:00.000` part?




How to format DateTime in Flutter

Updating from Xcode 10.0 beta 2 to **Xcode 10.0 beta 3** I now get this error at build time for an iOS project:

&gt;sourcekit: [1:connection-event-handler:10499: 0.0000] Connection interruptsourcekit: [1:updateSemanticEditorDelay:10499: 0.0007] disabling semantic editor for 10 secondssourcekit: [1:pingService:10499: 0.0007] pinging servicesourcekitten: connection to SourceKitService restored!  
&gt;Connection interrupted  
&gt;Never call this for file that sourcekitd fails.: file File+Cache.swift, line 127  
&gt;/Users/Coeur/Library/Developer/Xcode/DerivedData/My-App-eloayqptodupvfhbyegtkncnhcpu/Build/Intermediates.noindex/My-App.build/UAT-iphonesimulator/My-App-Debug.build/Script-379156A71D62F5C100574D04.sh: line 2: 34382 Abort trap: 6           &quot;${PODS_ROOT}/SwiftLint/swiftlint&quot;  
&gt;Command PhaseScriptExecution failed with a nonzero exit code

Swift 4.1  
CocoaPods 1.5.3  
SwiftLint 0.26.0  


&quot;${PODS_ROOT}/SwiftLint/swiftlint&quot; causes &quot;Command PhaseScriptExecution failed with a nonzero exit code&quot; with Xcode 10

First it said that 

&gt; &#39;UIApplicationDidEnterBackground&#39; has been renamed to
&gt; &#39;UIApplication.didEnterBackgroundNotification&#39;

 and when I dot it,it said 

&gt; Type &#39;Notification.Name&#39; (aka &#39;NSNotification.Name&#39;) has no member
&gt; &#39;UIApplication&#39;


    func listenForBackgroundNotification() {
        observer = NotificationCenter.default.addObserver(forName: Notification.Name.UIApplicationDidEnterBackground, object: nil, queue: OperationQueue.main) { [weak self] _ in
            if let weakSelf = self {
                if weakSelf.presentedViewController != nil {
                    weakSelf.dismiss(animated: true, completion: nil)
                }
                weakSelf.descriptionTextView.resignFirstResponder()
                
            }
        }
    }

Type &#39;Notification.Name&#39; (aka &#39;NSNotification.Name&#39;) has no member &#39;UIApplication&#39;

    [1, 2, 3, -1, -2].filter({ $0 &gt; 0 }).count // =&gt; 3
    
    [1, 2, 3, -1, -2].lazy.filter({ $0 &gt; 0 }).count // =&gt; 3

What is the advantage of adding `lazy` to the second statement. As per my understanding, when `lazy` variable is used, memory is initialized to that variable at the time when it used. How does it make sense in this context?

[![enter image description here][1]][1]

Trying to understand the the use of `LazySequence` in little more detail. I had used the `map`, `reduce` and `filter` functions on sequences, but never on `lazy` sequence. Need to understand why to use this?

  [1]: https://i.stack.imgur.com/kx3L9.png

Why and when to use lazy with Array in Swift?

I want to config Firebase Firestore. I followed all the steps, but at the last step, I got the error link below I mention.

After Executing this **pod install** command below error I got

&gt; [!] Automatically assigning platform `ios` with version `11.4` on
&gt; target `testing_gowtham` because no platform was specified. Please
&gt; specify a platform for this target in your Podfile. See
&gt; `https://guides.cocoapods.org/syntax/podfile.html#platform`.


My podfile:

    # Uncomment the next line to define a global platform for your project
    # platform :ios, &#39;9.0&#39;
    
    target &#39;testing_gowtham&#39; do
      # Comment the next line if you&#39;re not using Swift and don&#39;t want to use dynamic frameworks
      use_frameworks!
    
    
      # Pods for testing_gowtham
    
      target &#39;testing_gowthamTests&#39; do
        inherit! :search_paths
        # Pods for testing
      end
    
      target &#39;testing_gowthamUITests&#39; do
        inherit! :search_paths
        # Pods for testing
      end
    
        pod &#39;Firebase/Core&#39;
        pod &#39;Firebase/Firestore&#39;
    end

I saw this https://guides.cocoapods.org/syntax/podfile.html#platform but I did not find which line I need to change .

How to solve this issue?

Please specify a platform for this target in your Podfile?

There are a lot of topics about the [HTTP/2][1] protocol, but I wonder if there is a working website with this protocol.

I.e.

We can decide to use `http://` or `https://`, but how can we write a HTTP/2 request?

I am aware that this protocol depends on the server capability, but I can not find a way to check if a website, e.g. `google.com`, has HTTP/2 support enabled.

[![HTTP/2 browser support][2]][2]

As I can see in this picture, all modern browsers support this protocol.
I have not seen any link that could look like a new generation protocol.

Are we using the HTTP/2 protocol without knowing or it is just a fairy tale?

  [1]: https://en.wikipedia.org/wiki/HTTP/2
  [2]: https://i.stack.imgur.com/pyhyL.png


How to check if a website has HTTP/2 protocol support

I&#39;m implementing a *very* custom NavigationLink called `MenuItem` and would like to reuse it across the project. It&#39;s a struct that conforms to `View` and implements `var body : some View` which contains a `NavigationLink`.
I need to somehow store the view that shall be presented by `NavigationLink` in the body of `MenuItem` but have yet failed to do so.

I have defined `destinationView` in `MenuItem`&#39;s body as `some View` and tried two initializers:

This seemed too easy:
```Swift
struct MenuItem: View {
    private var destinationView: some View
    
    init(destinationView: View) {
        self.destinationView = destinationView
    }

    var body : some View {
        // Here I&#39;m passing destinationView to NavigationLink...
    }
}
```
**--&gt; Error:** Protocol &#39;View&#39; can only be used as a generic constraint because it has Self or associated type requirements.

2nd try:
```Swift
struct MenuItem: View {
    private var destinationView: some View
    
    init&lt;V&gt;(destinationView: V) where V: View {
        self.destinationView = destinationView
    }

    var body : some View {
        // Here I&#39;m passing destinationView to NavigationLink...
    }
}
```
**--&gt; Error:** Cannot assign value of type &#39;V&#39; to type &#39;some View&#39;.

Final try:
```Swift
struct MenuItem: View {
    private var destinationView: some View
    
    init&lt;V&gt;(destinationView: V) where V: View {
        self.destinationView = destinationView as View
    }

    var body : some View {
        // Here I&#39;m passing destinationView to NavigationLink...
    }
}
```

**--&gt; Error:** Cannot assign value of type &#39;View&#39; to type &#39;some View&#39;.

I hope someone can help me. There must be a way if NavigationLink can accept some View as an argument.
Thanks ;D

Weak' must not be applied to non-class-bound consider adding a protocol conformance that has a class bound

Ios Problem Overview

Ios Solutions

Navigator routes Clear the stack of flutter

Xcode 10: unable to attach DB error

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