WKWebView禁用捏合手势

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WKWebview本身不支持捏合手势，但是如果把WKWebview放到ScrollView上面，由于ScrollView支持捏合手势，导致WKWebview的内容会支持捏合手势。这种情况下要禁止WKWebview捏合手势就需要添加如下代码：

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- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation
{
    NSString *javascript = @"var meta = document.createElement('meta');meta.setAttribute('name', 'viewport');meta.setAttribute('content', 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no');document.getElementsByTagName('head')[0].appendChild(meta);";
    [webView evaluateJavaScript:javascript completionHandler:nil];
}

注意：下面的设置并不能有效禁止捏合手势

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//ScrollView
scrollView.pinchGestureRecognizer.enabled = NO;
scrollView.minimumZoomScale = 1;
scrollView.maximumZoomScale = 1;

//webView
webView.scrollView.pinchGestureRecognizer.enabled = NO;
webView.scrollView.minimumZoomScale = 1;
webView.scrollView.maximumZoomScale = 1;

//ScrollView Delegate
- (UIView*)viewForZoomingInScrollView:(UIScrollView*)scrollView
{
    return nil;
}