WKWebView crashes in acceleratedAnimationDidStart

You should create the webView in the main thread

- (void)createWebView{
    if (![NSThread isMainThread]) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [self createWebView];
        });
        return;
    }
    self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 320)];
    //Rest of my code
}