通过 UIWebView 点击传递 URL 不正确

Question

好的，我目前拥有的是一个带有五个选项卡的 TabBarController。这些选项卡中的每一个都是 UINavigationControllers。与选项卡关联的每个视图都链接到一个 XIB 文件，该文件包含一个带有 UIWebView 的视图。我想要发生的是，当在 UIWebView 中单击一个链接时，一个新的导航视图（带有后退按钮）被推送到堆栈上，并且内容被单击的链接填充，实际发生的是关闭但没有雪茄。它加载了我离开的原始页面，例如：我在 www.example.com 上，然后单击一个链接，新视图加载（带有后退按钮），然后重新加载 www.example.com :(

另外，我在 viewDidLoad 方法中进行了检查，以确定选择了哪个选项卡，而哪个选项卡又告诉了需要显示哪些内容。

这是我的代码：

- (void)viewDidLoad {
// Allows webView clicks to be captured.
webView.delegate = self;
// Places statsheet image centered into the top nav bar.
UIImage *image = [UIImage imageNamed: @"header.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage: image];
self.navigationItem.titleView = imageView;
[imageView release];

// Loads webpage according to the tab selected.
if (self.tabBarController.selectedIndex == 0) {
     [webView loadRequest: [ NSURLRequest requestWithURL: [ NSURL URLWithString: @"http://mobile.example.com" ] ] ];
}
else if (self.tabBarController.selectedIndex == 1) {
    [webView loadRequest: [ NSURLRequest requestWithURL: [ NSURL URLWithString: @"http://mobile.example.com/schedule" ] ] ];    
}
else if (self.tabBarController.selectedIndex == 2) {
    [webView loadRequest: [ NSURLRequest requestWithURL: [ NSURL URLWithString: @"http://mobile.example.com/roster" ] ] ];  
}
else if (self.tabBarController.selectedIndex == 3) {
    [webView loadRequest: [ NSURLRequest requestWithURL: [ NSURL URLWithString: @"http://mobile.example.com/stats" ] ] ];   
}
else if (self.tabBarController.selectedIndex == 4) {
    [webView loadRequest: [ NSURLRequest requestWithURL: [ NSURL URLWithString: @"http://mobile.example.com/about" ] ] ];   
}

// Loads the super class.
[super viewDidLoad];

}

- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {

NSURL *url = request.URL;
NSString *urlString = url.absoluteString;
NSRange page = [ urlString rangeOfString: @"/?page=" ];
NSRange post = [ urlString rangeOfString: @"/posts/" ];
NSRange notBlog = [ urlString rangeOfString: @"example" ];
// Allow webapge to load if next or prev button is clicked.
if ( page.location != NSNotFound ) {
    return YES;
}
// Pass post link to new view with a back navigation button. 
else if ( post.location != NSNotFound) {
    NavigationViewController *newView = [[NavigationViewController alloc] initWithNibName:@"NavigationView" bundle:nil];
    // ^^^^^^^^^^^^^^^^^^ Here is where the new view is pushed but doesnt load the correct page
    [self.navigationController pushViewController:newView animated:YES];
    UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc]
    initWithTitle:@"Back"
    style:UIBarButtonItemStyleBordered
    target:nil
    action:nil];
    self.navigationItem.backBarButtonItem = backBarButtonItem;
    [backBarButtonItem release];
    [newView release];
    return NO;
}
// Allow all links that are a part of the five main pages to be loaded.
else if ( notBlog.location != NSNotFound) {
    return YES;
}
//Allows everything else to be loaded into a new view with a back navigation button.
else {
    NavigationViewController *newView = [[NavigationViewController alloc] initWithNibName:@"NavigationView" bundle:nil];
// ^^^^^^^^^^^^^^^^^^ Here is where the new view is pushed but doesnt load the correct page
    [self.navigationController pushViewController:newView animated:YES];
    UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc]
    initWithTitle:@"Back"
    style:UIBarButtonItemStyleBordered
    target:nil
    action:nil];
    self.navigationItem.backBarButtonItem = backBarButtonItem;
    [backBarButtonItem release];
    [newView release];
    return NO;
}

}

Answer 1

在 webView:shouldStartLoadWithRequest 您永远不会将 URL 传递给您创建的“NavigationViewController”实例。它不能工作......

因此，每次调用 viewDidLoad 时，您都会根据 tabBar 状态调用 4 个 URL 之一。

这是你应该做的：

在 NavigationViewController 中：

• 添加“NSURL *pageURL”属性
• 创建一个好的初始化方法：

-(id)initWithURL:(NSURL *)url
{
    if ([super initWithNibName:@"NavigationView" bundle:nil])
    {
       _pageURL = [url retain];
    }
    return self;
}

在 viewDidLoad 中：

if (_pageURL == nil) {
// Loads webpage according to the tab selected.
if (self.tabBarController.selectedIndex == 0) {
     [webView loadRequest: [ NSURLRequest requestWithURL: [ NSURL URLWithString: @"http://mobile.example.com" ] ] ];
}
else if (self.tabBarController.selectedIndex == 1) {
    _pageURL = [ NSURL URLWithString: @"http://mobile.example.com/schedule" ];    
}
else if (self.tabBarController.selectedIndex == 2) {
    _pageURL = [ NSURL URLWithString: @"http://mobile.example.com/roster" ];  
}
else if (self.tabBarController.selectedIndex == 3) {
    _pageURL = [ NSURL URLWithString: @"http://mobile.example.com/stats" ];   
}
else if (self.tabBarController.selectedIndex == 4) {
    _pageURL = [NSURL URLWithString:@"http://mobile.example.com/about" ];   
}
}

[webView loadRequest:[NSURLRequest requestWithURL:_pageURL]];

// Loads the super class.
[super viewDidLoad];

然后在 webView:shouldStartLoadWithRequest 中正确初始化您的实例

NavigationViewController *newView = [[NavigationViewController alloc] initWithURL:request.URL];

添加到顶部

-(BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {

NSURL *url = request.URL;

NSString *urlString = url.absoluteString;

if ([urlString isEqualToString:_pageURL.absoluteString]){return YES;}

...