AXWebViewController
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cleanCache时崩溃
NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes]; NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0]; [[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:nil];
websiteDataTypes为nil时崩溃