if (@available(iOS 11.0,*)) {
self.webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
} else {
self.automaticallyAdjustsScrollViewInsets = NO;
}
黑边是因为scrollView发生了偏移。在iOS11上,automaticallyAdjustsScrollViewInsets被弃用了,取而代之的是为UIScrollView增加了contentInsetAdjustmentBehavior这个属性。