一旦关闭,从UIWebView释放内存/cookie/缓存 [英] Release memory/cookie/cache from UIWebView once closed
问题描述
我有一个 UIViewController
,其中包含一个 UIWebView
.
I have a UIViewController
which contains a UIWebView
.
我使用UIViewController中的UIWebview登录到要说Facebook的网站,然后单击完成,这将关闭视图控制器,我想这将释放视图控制器.但是当我再次打开UIWebview(不退出应用程序,甚至不终止应用程序后)时,在加载Web视图后,该网页仍会登录Facebook.我应该如何释放Web视图,以便每次单击完成"并返回到Web视图时,Web视图将始终像全新",而不是登录到我以前登录过的任何网站.
i login to a website for say facebook using the UIWebview in the UIViewController then i click on done, which dismiss the view controller, which i suppose will release the view controller. but when i open the UIWebview again (without exiting the app and also even after terminating the app) the webpage is still log into Facebook after the web view loads. How should i release the web view so that every time i click on done and return back to the web view, the web view will always be like "brand new" not log-on to any website that i had previously log-on to.
- (void)viewDidLoad{
NSLog(@"webView viewDidLoad called");
appDelegate = (LoginDBAppDelegate *)[[UIApplication sharedApplication] delegate];
loginObj = [appDelegate.loginArray objectAtIndex:currentSelectedRow];
myWebView.delegate = self;
[super viewDidLoad];
[self showWebView];
}
-(void)showWebView{
NSLog(@"webView showWebView called");
NSURL *url = [NSURL URLWithString:loginObj.loginURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[myWebView loadRequest:request];
}
-(IBAction)done_Clicked:(id)sender{
NSLog(@"webView Done_Clicked");
//dismiss the controller
[self.navigationController dismissModalViewControllerAnimated:YES];
}
-(void)dealloc{
[myWebView release];
myWebView.delegate = nil;
[activity release];
[urlTextField release];
[super dealloc];
}
我已经尝试过了,但是没有用:
I have tried this but it didn't work:
-(IBAction)done_Clicked:(id)sender{
NSLog(@"webView Done_Clicked");
[[NSURLCache sharedURLCache] removeAllCachedResponses];
[myWebView stringByEvaluatingJavaScriptFromString:@"var body=document.getElementsByTagName('body')[0];body.style.backgroundColor=(body.style.backgroundColor=='')?'white':'';"];
[myWebView stringByEvaluatingJavaScriptFromString:@"document.open();document.close()"];
//dismiss the controller
[self.navigationController dismissModalViewControllerAnimated:YES];
}
我也尝试了此尝试,但没有成功:
I have also tried this without any success:
- (void) viewDidDisappear:(BOOL)animated {
NSLog(@"webView viewDidDisappear called");
[super viewDidDisappear:animated];
[self.myWebView removeFromSuperview];
self.myWebView.delegate = nil;
self.myWebView = nil;
[myWebView release];
}
推荐答案
从论坛上某人那里得到答案,所以要相信他...
Got the answer from someone on the forum, so credit to him...
将此代码放入viewDidLoad
Place this code in viewDidLoad
//Set Cache
NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
[NSURLCache setSharedURLCache:sharedCache];
//Clear All Cookies
for(NSHTTPCookie *cookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {
//if([[cookie domain] isEqualToString:someNSStringUrlDomain]) {
[[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:cookie];
}
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