wkwebview白屏

解决方案

在viewDidAppear回调进行遍历WKWebView的subviews，查找WKCompositingView是否存在来判断是否白屏；出现白屏可以关闭页面或者重新构造WKWebView页面，经过测试reload，loadRequest没有效果；

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    BOOL isblank = [self isBlankView:self.webView];

    if (isblank)

        {

            [self performSelector:@selector(dismissViewController) withObject:nil afterDelay:0.1];

        }

}



- (void)dismissViewController
{
    [self.navigationController popViewControllerAnimated:YES];
}

/*
 * 判断是否白屏(WKCompositingView不存在)
 * YES：blank
 */
- (BOOL)isBlankView:(UIView*)view
{
    //NSLog(@"root:%@", NSStringFromClass(view.class));
    Class wkCompositingView = NSClassFromString(@"WKCompositingView");
    if ([view isKindOfClass:[wkCompositingView class]])
    {
        return NO;
    }
    for (UIView *subView in view.subviews)
    {
        //NSLog(@"child:%@", NSStringFromClass(subView.class));
        if (![self isBlankView:subView])
        {
            return NO;
        }
    }
    return YES;
}