离线UIWebView查看旧图像

Question

我创建了一个在iOS应用中离线运行的UIWebView。我正在利用某个javascript库来显示虚拟游览，这就是我需要使用UIWebView的原因。

我现在遇到运行应用程序的问题：很多时候它显示旧图像，即使它们不在资源中或已经更新。我已经尝试了很多方法来解决这个问题，包括设置缓存策略：

NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"splash2" ofType:@"html"]isDirectory:NO];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[self.webView loadRequest:request];

在viewDidLoad的最顶部，我尝试设置缓存容量：

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
    [NSURLCache setSharedURLCache:sharedCache];

这在我的应用程序上有了FininLaunchingWithOptions：

[[NSURLCache sharedURLCache] removeAllCachedResponses];

目前我的viewDidLoad

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
    [NSURLCache setSharedURLCache:sharedCache];


    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"splash2" ofType:@"html"]isDirectory:NO];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
    [self.webView loadRequest:request];

    webView.frame = CGRectMake(0, 0, 1024, 768);

    webView.scalesPageToFit = NO;

    webView.multipleTouchEnabled = YES;

    for (id subview in webView.subviews)
        if ([[subview class] isSubclassOfClass: [UIScrollView class]])
            ((UIScrollView *)subview).bounces = NO;


    [super viewDidLoad];

我也试过viewDidLoad：

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"splash2" ofType:@"html"]isDirectory:NO]];

    webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];


    NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
    [NSURLCache setSharedURLCache:sharedCache];


    [webView loadRequest:request];
    [self.view addSubview:webView];


    webView.scalesPageToFit = NO;

    webView.multipleTouchEnabled = YES;

    for (id subview in webView.subviews)
        if ([[subview class] isSubclassOfClass: [UIScrollView class]])
            ((UIScrollView *)subview).bounces = NO;


    [super viewDidLoad];

此外，我不确定它是否与html5清单有关。总而言之，我只是需要它来关闭缓存并始终阅读我资源中当前存在的内容。