blocks|key|1409982|text|现在，我不得不暂时禁用Firebase+(和GoogleSignIn)来使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409983|在我的例子中，我使用Cocoapods，因此我注释掉了Podfile中的库：|1409984|#++pod+'Firebase/Analytics'
#++pod+'Firebase/Crashlytics'
#++pod+'Firebase/Messaging'
#++pod+'GoogleSignIn'|code-block|syntax|javascript|1409985|然后$+pod+install暂时删除它们。|offset|length|style|CODE|1409986|最后，在需要的地方使用#if+canImport(Firebase)+(和#if+canImport(GoogleSignIn))预处理宏。|1409987|#if+canImport(Firebase)
import+Firebase
#endif
#if+canImport(GoogleSignIn)
import+GoogleSignIn
#endif

//+...

func+application(_+application:+UIApplication,+didFinishLaunchingWithOptions+launchOptions:+[UIApplication.LaunchOptionsKey:+Any]?)+->+Bool
{
++++//+...

++++#if+canImport(Firebase)
++++FirebaseApp.configure()
++++#endif|1409988|这并不是最优的，但在Xcode+12修复它或Google更新其框架之前，没有别的办法。|1409989|entityMap^0|0|0|0|2|D|0|B|N|11|R|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$K|10|L|11|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@$K|13|L|14|M|N]|$K|15|L|16|M|N]]|9|@]|A|$]]|$1|Q|3|R|5|F|7|17|8|@]|9|@]|A|$G|H]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|V|$]]

For now I have to temporarily disable Firebase (and GoogleSignIn) to work with SwiftUI's Live Previews.

In my case I use Cocoapods, so I comment out the libraries from my Podfile:

<pre><code># pod 'Firebase/Analytics'
# pod 'Firebase/Crashlytics'
# pod 'Firebase/Messaging'
# pod 'GoogleSignIn'
</code></pre>

Then <code>$ pod install</code> to temporarily remove them.

And finally use <code>#if canImport(Firebase)</code> (and <code>#if canImport(GoogleSignIn)</code>) preprocessor macros where needed.

<pre><code>#if canImport(Firebase)
import Firebase
#endif
#if canImport(GoogleSignIn)
import GoogleSignIn
#endif

// ...

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -&gt; Bool
{
 // ...

 #if canImport(Firebase)
 FirebaseApp.configure()
 #endif
</code></pre>

Not optimal, but until Xcode 12 fixes it or Google updates its frameworks no other way around it.

blocks|key|1410045|text|尝试禁用方案的代码覆盖率。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1410046|这对我有用。|1410047|1410048|+On+Xcode+11.3通过简单地禁用为我的方案收集的代码覆盖率，我已经能够构建SwiftUI预览。上面的解决方案不起作用，因为我仍然收到了Firebase的"failedToBuildDylib“错误。事实上，至少在我的情况下，上面的修正似乎根本没有必要。希望这能帮上忙。|blockquote|1410049|1410050|1410051|贷记：https://twitter.com/dannypier/status/1190312160557068293|1410052|entityMap|0|LINK|mutability|MUTABLE|url|https://twitter.com/dannypier/status/1190312160557068293^0|2|4|0|0|0|0|0|0|3|1K|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|11|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|12|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|13|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|P|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]]]

Try Disable Code Coverage for the scheme.

This worked for me.

<blockquote>
 On Xcode 11.3 I've been able to get SwiftUI Previews building by simply disabling Code Coverage gathering for my scheme. The above solutions weren't working as I was still getting "failedToBuildDylib" errors for Firebase. In fact, the above fixes don't seem to be necessary at all, at least on my case. Hope this helps someone.
</blockquote>

Credits to: <a href="https://twitter.com/dannypier/status/1190312160557068293" rel="noreferrer">https://twitter.com/dannypier/status/1190312160557068293</a>

blocks|key|487474|text|使用SPM安装firebase+(使用beta分支，因为到目前为止它仍然是测试版)，并删除CocoPods。预览将再次完美地运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|487475|下面是通过SPM+https://github.com/firebase/firebase-ios-sdk/blob/master/SwiftPackageManager.md安装防火墙的链接|offset|length|487476|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/firebase/firebase-ios-sdk/blob/master/SwiftPackageManager.md^0|0|9|27|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Install firebase using SPM (use the beta branch because its still beta until now) and remove CocoPods .. and previews will work again perfectly
Here is the link for installing firebase via SPM
<a href="https://github.com/firebase/firebase-ios-sdk/blob/master/SwiftPackageManager.md" rel="nofollow noreferrer">https://github.com/firebase/firebase-ios-sdk/blob/master/SwiftPackageManager.md</a>

Since I added Firebase to my project Live Previews no longer work. Regular builds do work, just no live previews.

I tried following all of this <a href="https://stackoverflow.com/q/42292090/1049134">answer</a> solutions and comments with no luck (that question has the same errors although unrelated to SwiftUI).

Diagnostics:

linker command failed with exit code 1 (use -v to see invocation)

<hr>

LinkDylibError: Failed to build UserViews.swift

Linking failed: linker command failed with exit code 1 (use -v to see invocation)

<pre><code>ld: warning: directory not found for option '-F/Applications/Xcode.app/Contents/SharedFrameworks-iphonesimulator'
Undefined symbols for architecture x86_64:
 "___llvm_profile_runtime", referenced from:
 ___llvm_profile_runtime_user in FirebaseCore(FIRAppAssociationRegistration.o)
 ___llvm_profile_runtime_user in FirebaseCore(FIRComponentType.o)
 ___llvm_profile_runtime_user in FirebaseCore(FIRConfiguration.o)
 ___llvm_profile_runtime_user in FirebaseCore(FIRCoreDiagnosticsConnector.o)
 ___llvm_profile_runtime_user in FirebaseCore(FIRDiagnosticsData.o)
 ___llvm_profile_runtime_user in FirebaseCore(FirebaseCore-dummy.o)
 ___llvm_profile_runtime_user in FirebaseCore(FIROptions.o)
 ...
 (maybe you meant: ___llvm_profile_runtime_user)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
</code></pre>

Problems with Firebase and SwiftUI Live Previews

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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因为我将Firebase添加到我的项目Live中，所以它不再工作了。常规的构建是可行的，只是没有现场预览。我尝试跟踪所有这些解决方案和注释，但都没有结果(这个问题有相同的错误，尽管与SwiftUI无关)。诊断：退出代码1的链接器命令失败(使用-v查看调用)LinkDylibError:未能构建UserViews.swi...

问Firebase和SwiftUI实况预览的问题
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