iOS开发 解决WKWebView加载的H5，无法调用拨打电话功

H5的拨打电话代码是

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UIWebView加载的H5，可以调用；但是WKWebView就是不行，找了半天，最后解决，在WKWebView的WKNavigationDelegate代理方法处理，代码如下：

// 处理拨打电话以及Url跳转等等  
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {  
    NSURL *URL = navigationAction.request.URL;  
    NSString *scheme = [URL scheme];  
    if ([scheme isEqualToString:@"tel"]) {  
        NSString *resourceSpecifier = [URL resourceSpecifier];  
        NSString *callPhone = [NSString stringWithFormat:@"telprompt://%@", resourceSpecifier];  
        /// 防止iOS 10及其之后，拨打电话系统弹出框延迟出现  
        dispatch_async(dispatch_get_global_queue(0, 0), ^{  
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:callPhone]];  
        });  
    }  
    decisionHandler(WKNavigationActionPolicyAllow);  
}