test.swift

 //清除cookies
 NSHTTPCookie *cookie;
 NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
 for (cookie in [storage cookies]){
     [storage deleteCookie:cookie];
 }
//清除UIWebView的缓存
[[NSURLCache sharedURLCache] removeAllCachedResponses];
NSURLCache * cache = [NSURLCache sharedURLCache];
[cache removeAllCachedResponses];
[cache setDiskCapacity:0];
[cache setMemoryCapacity:0];

[UIView setAnimationsEnabled:NO];

self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:[self createWKWebApp]];

[self.view addSubview: self.webView];

[self.webView setNavigationDelegate:self];
[self.webView setUIDelegate:self];
[self.webView.configuration.preferences setValue:@YES forKey:@"allowFileAccessFromFileURLs"];
self.webView.scrollView.bounces = NO;
[self.webView setContentMode:UIViewContentModeScaleAspectFit];

NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" inDirectory:@"www/engageapp"]];

if (@available(iOS 11.0, *)) { //適配IphoneX機型
    self.webView.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;

    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    self.globalRequestForIos11 = request;
    [self.webView loadRequest:request];

} else {

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:180];
    [request setHTTPMethod:@"POST"];
    self.globalRequest = request;
    [self.webView loadRequest:request];
}