I found the solution for this build error, for anybody else having the same issue with Xcode 10 build system, follow the following steps to fix it:

&gt;  1. In Xcode, go to File-&gt;Project/Workspace settings.
&gt;  2. Change the build system to Legacy Build system.

[![enter image description here][1]][1]

It will resolve the build issue with the new Xcode 10.

If you want to work with the new build system, then you can find the troubleshooting help [from this apple Xcode help page][2].

&gt; Edit:
&gt; 
&gt; I was able to resolve the issue with the new Xcode build system by
&gt; removing the duplicate info.plist from the Pod by following steps:
&gt; 
&gt; Solution - Open target &gt; Build phase &gt; Copy Bundle Resource/Compile
&gt; Sources &gt; removed info.plist from here


  [1]: https://i.stack.imgur.com/9dSK8.png
  [2]: https://help.apple.com/xcode/mac/current/#/dev621201fb0

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 am trying to use a supplier&#39;s library in combination with my C++ application. The library is largely based on C, which is normally not a problem with the `extern &quot;C&quot;` option, but I ran into an issue that the C++ compiler does not accept. 

I simplified my code into the following example files. header.h represents a header from the suppier library, main.c/cpp are my own files. My real application is a C++ application, so I want to get it to work with main.cpp. 

header.h (note the line `u64 u64;`):

    #ifndef HEADER_H
    #define HEADER_H

    #include &lt;stdint.h&gt;

    typedef uint64_t u64;

    union teststruct {
        u64 u64;
        struct {
            u64 x:32;
            u64 y:32;
        } s;
    };

    #endif

main.c:

    #include &lt;stdio.h&gt;
    #include &quot;header.h&quot;

    int main() {
        union teststruct a;
        a.u64=5;
        printf(&quot;%x\n&quot;, a.u64);
    
        return 0;
    }

main.cpp (same as main.c but with an extra `extern &quot;C&quot;` statement): 

    #include &lt;stdio.h&gt;

    extern &quot;C&quot; {
    #include &quot;header.h&quot;
    }

    int main() {
        union teststruct a;
        a.u64=5;
        printf(&quot;%x\n&quot;, a.u64);
        
        return 0;
    }

Compiling main.c using the line

    gcc -o test main.c

compiles without problems. However, compiling the C++ version using the g++ compiler with the command 

    g++ -o test main.cpp

gives the following compiler errors:

    In file included from main.cpp:12:0:
    header.h:11:9: error: ‘u64’ does not name a type
             u64 x:32;
             ^
    header.h:12:9: error: ‘u64’ does not name a type
             u64 y:32;
             ^

The issue is that the supplier used the same name (u64) for both the type and the variable name, which seems like a bad idea to begin with, but gcc apparently accepts it. I do not want to change the library (i.e. header.h) as it is very large,this occurs a lot in the code, and I occasionally get updates for it. Is there a way to make g++ accept this combination, or a way to modify main.cpp to make it compile _without_ changing header.h?

C vs C++ compilation incompatibility - does not name a type

I am working on an iOS app. It is working fine in Xcode 9.4.1, but when I build it in Xcode 10 it gives me following error:

    :-1: Multiple commands produce &#39;/Users/.../Library/Developer/Xcode/DerivedData/.../Build/Products/Dev-iphonesimulator/TLYShyNavBar/TLYShyNavBar.framework/Info.plist&#39;:
    1) Target &#39;TLYShyNavBar&#39; has copy command from &#39;/Users/.../Desktop/Workspace/iOS/.../Pods/TLYShyNavBar/TLYShyNavBar/Info.plist&#39; to &#39;/Users/.../Library/Developer/Xcode/DerivedData/.../Build/Products/Dev-iphonesimulator/TLYShyNavBar/TLYShyNavBar.framework/Info.plist&#39;
    2) Target &#39;TLYShyNavBar&#39; has process command with input &#39;/Users/.../Desktop/Workspace/iOS/.../Pods/Target Support Files/TLYShyNavBar/Info.plist&#39;

I tried the solutions from [this post][1] but they didn&#39;t work.
Any help provided is appreciated. Thanks!


  [1]: https://stackoverflow.com/q/50718018/3824808

Multiple commands produced error xcode 10

I am working on an iOS app. It is working fine in Xcode 9.4.1, but when I build it in Xcode 10 it gives me following error:
<pre><code class="hljs language-python">:-1: Multiple commands produce '/Users/.../Library/Developer/Xcode/DerivedData/.../Build/Products/Dev-iphonesimulator/TLYShyNavBar/TLYShyNavBar.framework/Info.plist':
1) Target 'TLYShyNavBar' has copy command from '/Users/.../Desktop/Workspace/iOS/.../Pods/TLYShyNavBar/TLYShyNavBar/Info.plist' to '/Users/.../Library/Developer/Xcode/DerivedData/.../Build/Products/Dev-iphonesimulator/TLYShyNavBar/TLYShyNavBar.framework/Info.plist'
2) Target 'TLYShyNavBar' has process command with input '/Users/.../Desktop/Workspace/iOS/.../Pods/Target Support Files/TLYShyNavBar/Info.plist'
</code></pre>
I tried the solutions from <a href="https://stackoverflow.com/q/50718018/3824808" target="_blank" rel="noopener noreferrer">this post</a> but they didn't work.
Any help provided is appreciated. Thanks!

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

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

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

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

I&#39;d like to use the new build system of Xcode 10 for development, but our build in our continuous integration system fails since the `xcarchive` produced has an issue: the `Info.plist` in the `xcarchive` is missing the `ApplicationProperties` key and the information therein!

It turns out switching back to the legacy build system fixes this. This can be done in the workspace settings (File &gt; Workspace Settings… &gt; Build System). But I would prefer to keep the new build system for development and only use the legacy build system for CI builds.

Is there a way to make `xcodebuild` use the legacy build system without modifying the workspace?

How can I use the legacy build system with Xcode 10&#39;s `xcodebuild`?

When I am trying to `sourceCpp`, it gives a warning: 

&gt; ld: warning: text-based stub file
&gt; /System/Library/Frameworks//CoreFoundation.framework/CoreFoundation.tbd
&gt; and library file
&gt; /System/Library/Frameworks//CoreFoundation.framework/CoreFoundation
&gt; are out of sync. Falling back to library file for linking.

But the function actually works. Just wondering how to solve this warning.

ld: warning: text-based stub file are out of sync. Falling back to library file for linking

&gt; Xcode 10 Release Notes: &quot;Code Completion for Swift image literals has been removed in Xcode 10&quot;

So it&#39;s not a bug that I couldn&#39;t add images in the code (and run older projects). How do we then add images from now on in the code as just typing `UIImageView(image: ` won&#39;t accept any png or jpeg.

    let cellImage: UIImageView = {
        let image = UIImageView(image: ???))
        
        return image
    }()

System: macOS Mojave  
Xcode: Xcode 10 Beta 4


Xcode 10 - image literals no longer available

&gt; ***Update at 2018.10.31***  
&gt;
&gt; *This bug has been fixed in iOS 12.1, have a good day~*

I found a problem with Array&#39;s value state in the newly released iOS&amp;nbsp;12 Safari, for example, code like this:

    &lt;!DOCTYPE html&gt;
    &lt;html&gt;
    &lt;head&gt;
        &lt;meta charset=&quot;utf-8&quot;&gt;
        &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0&quot;&gt;
        &lt;title&gt;iOS 12 Safari bugs&lt;/title&gt;
        &lt;script type=&quot;text/javascript&quot;&gt;
        window.addEventListener(&quot;load&quot;, function ()
        {
            let arr = [1, 2, 3, 4, 5];
            alert(arr.join());

            document.querySelector(&quot;button&quot;).addEventListener(&quot;click&quot;, function ()
            {
                arr.reverse();
            });
        });
        &lt;/script&gt;
    &lt;/head&gt;
    &lt;body&gt;
        &lt;button&gt;Array.reverse()&lt;/button&gt;
        &lt;p style=&quot;color:red;&quot;&gt;test: click button and refresh page, code:&lt;/p&gt;
    &lt;/body&gt;
    &lt;/html&gt;

After refreshing the page, the array&#39;s value is still reversed. Is this a bug or a feature of new Safari?

----------

Here is a demo page. Try to use it with iOS 12 Safari:
[https://abelyao.github.io/others/ios12-safari-bug.html][1]

  [1]: https://abelyao.github.io/others/ios12-safari-bug.html


Array state will be cached in iOS 12 Safari. Is it a bug or feature?

On iOS 12.2, while using `UIAlertController`&#39;s `actionSheet`, Xcode gives constraint error. Anyone having this problem?

This same code runs on iOS 12.1 with no error.

I have tested this code on Xcode 10.2 and 10.1.

``` Swift
class ViewController: UIViewController {
    
    let Click : UIButton = {
        let button = UIButton(type: UIButton.ButtonType.system)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle(&quot;OK&quot;, for: .normal)
        button.tintColor = UIColor.blue
        button.addTarget(self, action: #selector(click(_:)), for: UIControl.Event.touchUpInside)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(Click)
        Click.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        Click.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
    }

    
    @objc func click(_ sender: UIButton) {
        let optionMenu = UIAlertController(title: nil, message: &quot;Choose Option&quot;, preferredStyle: .actionSheet)
        
        let deleteAction = UIAlertAction(title: &quot;Delete&quot;, style: .default)
        let saveAction = UIAlertAction(title: &quot;Save&quot;, style: .default)
    
        let cancelAction = UIAlertAction(title: &quot;Cancel&quot;, style: .cancel)
        
        optionMenu.addAction(deleteAction)
        optionMenu.addAction(saveAction)
        optionMenu.addAction(cancelAction)
        
        self.present(optionMenu, animated: true, completion: nil)
    }

}
```

```
[LayoutConstraints] Unable to simultaneously satisfy constraints.
	Probably at least one of the constraints in the following list is one you don&#39;t want. 
	Try this: 
		(1) look at each constraint and try to figure out which you don&#39;t expect; 
		(2) find the code that added the unwanted constraint or constraints and fix it. 
(
    &quot;&lt;NSLayoutConstraint:0x6000001b6ee0 UIView:0x7fe3b6513020.width == - 16   (active)&gt;&quot;
)

Will attempt to recover by breaking constraint 
&lt;NSLayoutConstraint:0x6000001b6ee0 UIView:0x7fe3b6513020.width == - 16   (active)&gt;
```

PS: 

Just to make sure that the problem is on `UIAlertController`, I removed everything and updated the code as below, but I received the same error:

```Swift
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        let optionMenu = UIAlertController(title: &quot;Test&quot;, message: &quot;Choose Option&quot;, preferredStyle: .actionSheet)
        
        let deleteAction = UIAlertAction(title: &quot;Delete&quot;, style: .default)
        let saveAction = UIAlertAction(title: &quot;Save&quot;, style: .default)
        
        let cancelAction = UIAlertAction(title: &quot;Cancel&quot;, style: .cancel)
        
        optionMenu.addAction(deleteAction)
        optionMenu.addAction(saveAction)
        optionMenu.addAction(cancelAction)
        
        self.present(optionMenu, animated: true, completion: nil)
    }
    
}
```

UIAlertController&#39;s actionSheet gives constraint error on iOS 12.2 / 12.3

If I have an app made with SwiftUI, will it work for iOS below iOS 13?

Content Type	Original Author	Original Content on Stackoverflow
Question	Akshay Sunderwani	View Question on Stackoverflow
Solution 1 - Ios	Akshay Sunderwani	View Answer on Stackoverflow

Multiple commands produced error xcode 10

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

C vs C++ compilation incompatibility - does not name a type

Navigator routes Clear the stack of flutter

Attributions