WEBKIT crash with Xcode 11.5 Fixed.

Question

Created May ’20

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Just installed Xcode 11.5. Now I get a hard crash. No build errors. No runtime errors. Here's the error output.

2020-05-20 18:43:50.479256-0700 Web_Test[42330:11982154] *** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named WKWebView because no class named WKWebView was found; the class needs to be defined in source code or linked in from a library (ensure the class is part of the correct target)'

Fixed the crash. Had to add WebKit.framework to Build Phases/Link Binary With Libraries.

Is this a bug with Xcode 11.5?

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Answer 1

DTS Engineer OP

Apple

May ’20

Had to add WebKit.framework to Build Phases/Link Binary With Libraries.

See this thread.

Is this a bug with Xcode 11.5?

That depends. The crash you were seeing is caused by UIKit trying to decode a nib that references

WKWebView

in a process where that class isn’t registered with the Objective-C runtime. That registration is based on whether you link to the WebKit framework. There are two ways this can happen:

Explicitly, as you’ve described above
Implicitly, based on your use of the framework

The implicit approach requires that you:

Set the Link Frameworks Automatically (
```
CLANG_MODULES_AUTOLINK
```
) build setting
Set the Enable Modules (
```
CLANG_ENABLE_MODULES
```
) build setting
Use C, Objective-C, or Swift (modules are not supported in C++)
Import the framework, for example, in Swift, with a line like this:
```
import WebKit
```
.

If you meet all of these requirements and you still see the problem, that’s definitely worth filing a bug about.

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Apple Developer Relations, Developer Technical Support, Core OS/Hardware

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