'Completion handler passed to -[ArticleDetailViewController webView:decidePolicyForNavigationActi...

今天在做WKWebView下载文件的时候报了个错

'Completion handler passed to -[ArticleDetailViewController webView:decidePolicyForNavigationAction:decisionHandler:] was not called'

后来发现decidePolicyForNavigationAction这个代理在写if else的时候decisionHandler

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