I got a UITabBarController and one of the bar items is a Navigation Controller with some buttons on it.
One of the buttons opens up a urlRequest and load it in a UIWebView.
NSURL * url = [NSURL URLWithString:myUrl];
NSURLRequest * urlRequest = [NSURLRequest requestWithURL:url];
UIWebView * web = [tView wView];
[web setScalesPageToFit:YES];
[web loadHTMLString:#"Loading" baseURL:nil];
[web loadRequest:urlRequest];
[self.navigationController pushViewController:tView animated:YES];
For some reason when i click the button for the first time nothing happens.
I used the UIWebViewDelegate protocol to debug it like so:
- (void)webViewDidStartLoad:(UIWebView *)webView
{
NSLog(#"webViewDidStartLoad");
}
When i click the button nothing happens, and i don't see the NSLog message.
When i hit back and click the button again, i see the debug and everything works just find.
Any idea what causing this ?
P.S if i put the :
[self.navigationController pushViewController:tView animated:YES];
in the webViewDidStarLoad method the application just hang, since it's not loading it on the first click.
You need to make sure that tView's view has been loaded. When a viewController is instantiated, its view (and all of it's IBOutlets) are all nil, and remain that way until the view is loaded.
You have two options: move your load stuff into tView's -viewDidLoad method, or force the view to load before calling [tView wView] by, for example, calling [tView view] (this will force the XIB file to be loaded, and all outlets to be connected.
Related
I have a tabbed application, with a tab that contains a UIWebView and a second tab with a Table View Controller.
I'm trying to make it so that when I click on a row in the table it takes me to my other tab and loads a web page.
Here's my storyboard:
This is in my implementation for the web view:
-(void)loadAViewer:(NSURL*)viewerURL
{
NSURLRequest *requestObj = [NSURLRequest requestWithURL:viewerURL];
[sfnViewer loadRequest:requestObj];
}
And then in the table view controller:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//Get the URL from plist
...
//Generate url, pass it in and switch to web view tab
viewerURL = [NSURL URLWithString:[NSString stringWithFormat:#"%#%#/viewer?username=%#&pw=%#&%#", web, loc, user, pass, params]];
ViewerFirstViewController *viewerWebView = [[ViewerFirstViewController alloc] init];
[viewerWebView loadAViewer:viewerURL];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[self.tabBarController setSelectedIndex:0];
}
Currently nothing happens. I'm taken to the other tab but with a blank UIWebView - no page loads but it doesn't crash either.
//Edit - Changes made based on answer from Steve
Based on this I've added
#property (strong, nonatomic) NSURL viewerUrl;
in my .h file for the UIWebView tab.
I've synthesized it in the .m and added this to my viewDidLoad method.
NSURLRequest *requestObj = [NSURLRequest requestWithURL:viewerURL];
[sfnViewer loadRequest:requestObj];
In the Table View Controller I'm now doing this.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//Get the URL from plist
...
//Generate url, pass it in and switch to web view tab
viewerURL = [NSURL URLWithString:[NSString stringWithFormat:#"%#%#/viewer?username=%#&pw=%#&%#", web, loc, user, pass, params]];
ViewerFirstViewController *viewerWebView = [[ViewerFirstViewController alloc] init];
[viewerWebView setViewerUrl:viewerURL];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[self.tabBarController setSelectedIndex:0];
}
Still to no avail.
It's probably not loading because when you call loadAViewer: the view itself hasn't been loaded yet so the sfnViewer outlet won't be hooked up to the UIWebView in your storyboard.
You can confirm this by checking if sfnViewer is nil in loadAViewer:.
If this is the case you will have to define an NSURL property on the ViewerFirstViewController and assign to that instead of calling loadAViewer:. Then in the viewWillAppear: method you should load the URL into sfnViewer.
However this will result in the web view being reloaded each time the tab is accessed, you could avoid this by checking if viewerURL is different from the URL currently in use in the web view: [sfnViewer.request.URL isEqual:self.viewerURL], if it is the same then don't create/load the request.
I'm trying create a subclass of UIActivity to add a custom button to a UIActivityViewController. I want this custom button to be able to open a link without leaving the application. I've found numerous solutions that allow for opening things in safari, but I can't figure out if it is possible to just open a UIWebview inside my app (Modal view perhaps?).
I've tried creating a `UIWebview in the delegate method to handle the click, but since this isn't a viewcontroller I can't add it to the view hierarchy.
- (void)prepareWithActivityItems:(NSArray *)activityItems{
UIWebView *webView=[[UIWebView alloc] initWithFrame:CGRectMake(0,0,320,480)];
NSURLRequest *urlRequest;
NSURL *urlforWebView;
urlforWebView=[NSURL URLWithString:#"http://www.google.com"];
urlRequest=[NSURLRequest requestWithURL:urlforWebView];
[webView loadRequest:urlRequest];
}
// example:Need to add your webview to your mainview first
UIWebView *webView = [[UIWebView alloc] init];
[webView setFrame:CGRectMake(0, 0, 320, 460)];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://google.com"]]];
[[self view] addSubview:webView];
I believe this project implements just what you would like to do but it opens in safari: https://github.com/davbeck/TUSafariActivity Good for starting point.
The activity itself cannot open the view as it is not connected to the controller view hierarchy. You need some way to tell the host controller that the user has selected your activity. The easiest way to do this is through notifications:
The view controller registers for notifications with a given identifier.
The activity posts this notification if performed.
The notification is processed by the activity in the handler method and it opens the web view.
Don't forget to unregister the view controller from the notification center if the controller is being removed from the navigation stack.
There are lots of examples for using notifications, like this Send and receive messages through NSNotificationCenter in Objective-C?
Try this
UIPlainViewController here is just a custom UIViewController with a WebView added to it. Implement (UIViewController *)activityViewController in your derived UIActivity class as such:
(UIViewController *)activityViewController {
NSString *page = #"some url";
NSURL *url = [[NSURL alloc] initWithString:page];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[((UIPlainViewController*)self.plainViewController).webView loadRequest:request];
return self.plainViewController;
}
My webpage will not load it shows nothing I have 3 viewcontrollers in firstviewcontroller you click the button which loads the next page thirdviewcontroller up to this point all is good but the webpage doesnt load
code from firstviewcontroller
-(IBAction)moveToViewSiteView:(id)sender{
self.third = [[[SecondViewController alloc]initWithNibName:#"ThirdViewController" bundle:nil]autorelease];
[self.navigationController pushViewController:self.third animated:YES];
}
code in thirdviewcontroller
- (void)viewDidLoad {
NSString *urlAddress=#"http://www.apple.com/";
NSURL *url=[NSURL URLWithString:urlAddress];
NSURLRequest *requestObj= [NSURLRequest requestWithURL:url];
[self.cscsPage loadRequest:requestObj];
[super viewDidLoad];
}
the uiwebview i have called webview in the document window in ib if i drag from files owner to the webview then when i run it the app crashes.
hope all is clear
thanks
Move [super viewDidLoad]; to the top of viewDidLoad method. You should invoke the super class implementation of it first.
im making an application where i have to load my database from html file which is in my resource folder. i have a table view and when i click on a certain cell it will open html file based on that click. can any one help me how to do this. thanks
// create a web view in "cellForRowAtIndexPath"
UIWebView *wv = [[UIWebView alloc] initWithFrame:CGRectMake(0,0,320,480)];
[wv loadHTMLString: << your html >> baseURL: nil];
wv.delegate = self;
// implement the webView delegate
- (void) webViewDidFinishLoad:(UIWebView *)webView {
[self.view addSubView:webView]; // or push onto the naviation controller
}
I think when you 'didSelectCellAtIndex' in the table view will open a new view controller with the webview. And you have also mapping of each cell with the corresponding html file name. Then in the viewDidLoad method of your next VC, you can use this code, while webView is the outlet pointing to your UIWebView. And htmlFileName is the html file's name.
[webView loadRequest:[NSURLRequest requestWithURL:
[NSURL fileURLWithPath:[[NSBundle mainBundle]
pathForResource:htmlFileName
ofType:#"html"]
isDirectory:NO] ] ];
From my Objective C iPhone app, I want a user to click on a "Register" for account button and then open up a registration page on my website. What is the code on the iPhone to open up a website in response to a user action?
Create a UIButton and assign the action to a method like this:
- (IBAction)register:(id)sender {
//you'll want to subclass UIViewController
SomeViewController *webViewController = [[SomeViewController alloc]init];
[self presentModalViewController:webViewController animated:YES];
[webViewController release];
}
Your SomeViewController will have a webview that load's your register page. Then in your "SomeViewController"'s viewDidLoad, do something like this:
- (void)viewDidLoad
{
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://mysite.com/register"]];
//this is a webview that you either created in -loadView or IB
[self.webView loadRequest:request];
}