iOS WKWebView 禁止长按和选择

NSMutableString*javascript = [NSMutableString string];
[javascript appendString:@"document.documentElement.style.webkitTouchCallout='none';"];//禁止长按
[javascript appendString:@"document.documentElement.style.webkitUserSelect='none';"];//禁止选择
WKUserScript*noneSelectScript = [[WKUserScript alloc] initWithSource:javascript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];