UIwebView 解决返回自动刷新问题

    [[NSUserDefaults standardUserDefaults] setInteger:2 forKey: @"WebKitCacheModelPreferenceKey"];

    [[NSUserDefaults standardUserDefaults] setInteger:1 forKey: @"WebKitMediaPlaybackAllowsInline"];

    id webView = [self.webView valueForKeyPath:@"_internal.browserView._webView"];

    id preferences = [webView valueForKey:@"preferences"];

    [preferences performSelector:@selector(_postCacheModelChangedNotification)];