1

我的应用程序显示了一个表格视图，其中包含来自 RSS 提要的文章列表。当用户选择一行时，它会打开一个 Web 视图控制器来显示文章。这一切都很好。我遇到的唯一问题是，当用户返回表格视图并选择另一篇文章时，Web 视图最初会显示旧文章，直到加载新文章。如何让它从 Web 视图中删除旧数据？

这是我在 tableview 中的 didSelectRowAtIndexPath 方法：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self.navigationController pushViewController:webViewController animated:NO];

    // Grab the selected item
    RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]];

    // Construct a URL with the link string of the item
    NSURL *url = [NSURL URLWithString:[entry link]];

    // Construct a request object with that URL
    NSURLRequest *req = [NSURLRequest requestWithURL:url];

    // Load the request into the web view
    [[webViewController webView]loadRequest:req];
    webViewController.hackyURL = url;
}

这是网络视图控制器：

#import "WebViewController.h"
#import "TUSafariActivity.h"
#import "SVProgressHUD.h"

@implementation WebViewController
@synthesize webView=webView, hackyURL=hackyURL;

- (void)loadView
{
    // Create an instance of UIWebView as large as the screen
    CGRect screenFrame = [[UIScreen mainScreen]applicationFrame];
    UIWebView *wv = [[UIWebView alloc]initWithFrame:screenFrame];
    webView = wv;
    NSLog(@"%@",webView.request.URL);
    // Tell web view to scale web content to fit within bounds of webview
    [wv setScalesPageToFit:YES];

    [self setView:wv];
}

- (UIWebView *)webView
{ 
    return (UIWebView *)[self view];
}

- (void) showMenu
{
    NSURL *urlToShare = hackyURL;
    NSArray *activityItems = @[urlToShare];
    TUSafariActivity *activity = [[TUSafariActivity alloc] init];

    __block UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:@[activity]];
    activityVC.excludedActivityTypes = @[UIActivityTypeAssignToContact, UIActivityTypePostToWeibo, UIActivityTypeSaveToCameraRoll];

    [self presentViewController:activityVC animated:YES completion:^{activityVC.excludedActivityTypes = nil; activityVC = nil;}];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    UIBarButtonItem *systemAction = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(showMenu)];
    self.navigationItem.rightBarButtonItem = systemAction;
}

@end
4

2 回答 2

4

您可以通过将空白文档作为第一行加载到 Web 视图中来清除 Web 视图didSelectRowAtIndexPath：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [[webViewController webView] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"about:blank"]]];

    ...
于 2013-08-12T13:56:53.493 回答
0

最好在 "Tableview did select" 方法中保持一个标签值，并在 Web 视图加载视图控制器中保持相同的标签值。

于 2013-08-12T13:46:26.300 回答