Wkwebview crashes at start in beta 340007

cvp

@mikael WKebView.py crashes at start with _objc_exception.txt containing

The app was terminated due to an Objective-C exception. Details below:

2023-03-14 15:32:08.098719
Completion handler passed to -[CustomNavigationDelegate webView:decidePolicyForNavigationAction:decisionHandler:] was not called

Something similar?

Edit: issue opened in GitHub

bosco

@cvp I found a work around for this that seems to work for me.

Run this script once after a cold start of Pythonista.

#coding: utf-8
import sys
from objc_util import  *

class MyWebView():
    
    WKWebView = ObjCClass('WKWebView')
    
    def __init__(self):

        self.create_webview()

    @on_main_thread
    def create_webview(self):

        self.webview = MyWebView.WKWebView.alloc().\
            initWithFrame_(
            ((0,0), (100, 100))).autorelease()

    
if __name__ == '__main__':

    v = MyWebView()
    print(v)
    print('ok')

Remove the @on_main_thread decorators from 2 eval_js functions.

    #@on_main_thread
    def _eval_js_sync_callback(self, value):
        self.eval_js_queue.put(value)

    #@on_main_thread
    def eval_js_async(self, js, callback=None):

It seems like it's a timing issue.

cvp

@bosco I have tested with your modification, but not with your script, with the WkWebView.py it-self and it still crashes but without writing anything in _objc_exception.txt. Then, I have restarted Pythonista and reset old code and retried. Also crash without writing in _objc_exception.txt.
Weird, isn'iit? I did not try your code yet.

Edit: I have tried your little script with original WkWebView, thus with main_thread, without crash.

bosco

@cvp I'm running beta 340007 on my iPhone 12 mini, but I haven't upgraded my iPad. In the past, my iPhone has been more likely to crash with code that runs fines on my iPad.

cvp

@bosco I run on iPad Air 5 (M1) with beta 340007. I have opened an issue in Github and @mikael will check it. No urgence, but perhaps he would be interested by your workaround. Wait and see. Thanks for helping.

bosco

@cvp Thanks for ALL your help on this forum!

cvp

@bosco you are too kind