iOS WKWebview打开PDF和网页

//打开PDF
WKWebView *web = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, kScreen_Width, kScreen_Height-kHTMI_NavigationBarHeight-kHTMI_MoreTabBarHeight)];
web.backgroundColor = [UIColor whiteColor];
[self.view addSubview:web];
NSURL *url = [NSURL fileURLWithPath:self.pdfFilePath];
[web loadFileURL:url allowingReadAccessToURL:[url URLByDeletingLastPathComponent]];

//打开网页
WKWebView web = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, kScreen_Width, kScreen_Height-kHTMI_NavigationBarHeight-kHTMI_MoreTabBarHeight)];
web.backgroundColor = [UIColor whiteColor];
[self.view addSubview:web];
/ 加载服务器url的方法*/
NSString *url = @"https://www.baidu.com";
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
[webview loadRequest:request];