How can I call the iPhone Photo Library when an HTML button element (e.g., <input type="button">) is clicked in a WebView? Any help will be appreciated.
One way would be to call a custom url like
open:\\imageBrowser
Then in the UIwebViewDelegate catch this URL and open the Photo library picker:
- (BOOL) webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if ([[[request URL] absoluteURL] isEqualToString:#"open:\\imageBrowser"] {
// open the image picker
}
}
Related
I am relatively new to Xcode and I have started building an app that uses UIWebView. To make it compliant for App Store submission, Apple prefers you use Safari. To overcome this problem I want to add a button to my UIWebView navigation that, when clicked, will open the same url in Safari. An example of this can be seen in the Twitter app; they have a button that opens the currently viewed UIWebView in a Safari window.
You can use the UIWebViewDelegate's method
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if iWantToOpenThisURLInSafari([request URL]) {
[UIApplication openUrl:[request URL]];
return NO; // tell the webView to not navigate to the URL, I'm handling it
} else {
return YES;
}
}
- (BOOL)iWantToOpenThisURLInSafari:(NSURL* url) [
// you just have to fill in this method.
return NO;
}
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIWebViewDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intf/UIWebViewDelegate
EDIT: more details as requested by #PaulGraham
// You have a pointer to you webView somewhere
UIWebView *myWebView;
// create a class which implements the UIWebViewDelegate protocol
#interface MyUIWebViewDelegate:NSObject<UIWebViewDelegate>
// in this class' #implementation, implement the shouldStartLoad..method
#implementation
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if iWantToOpenThisURLInSafari([request URL]) {
[UIApplication openUrl:[request URL]];
return NO; // tell the webView to not navigate to the URL, I'm handling it
} else {
return YES;
}
}
// then, set the webView's delegate to an instance of that class
MyUIWebViewDelegate* delegate = [[MyUIWebViewDelegate alloc] init];
webView.delegate = delegate;
// your delegate will now recieve the shouldStartLoad.. messages.
HI am making a application in which the the user enter data into text field(url) and that url is opened in the webview below that .Now when the user clicks on any link in the webview that we have opened then can i get the address of the clicked url (the url which user clicked on the webview) as i need to update(display) that url into texfiled above , so that user can come to know which url is being opened.
you can use
- (BOOL)webView:(UIWebView *)theWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
delegate for your purpose.
like
- (BOOL)webView:(UIWebView *)theWebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL *requestedUrl = [request URL];
//use requestedURL methods
// like yourtextbox.text = [requestedUrl absoluteURL];
//don't forget to return YES :)
return YES;
}
Yes there is an undocumented method. See my answer in the post Show alert view when click on a link
Yes, UIWebView has some delegate methods which can help you with this:
Check this one
– webView:shouldStartLoadWithRequest:navigationType:
I've got a UIWebView which shows up a couple of screens into a UINavigationController:
First View > Second View > View with UIWebView + UILabel
Now, I display a certain page in that web view, which has a link back to my app....
myapp://foofoo
I know you can set up a custom URL with (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url and some info.plist poking, but how would change the UILabel, which is one the same screen as UIWebView, by simply clicking the myapp://foofoo link?
The best way to do this would be through a custom link, and then use the UIWebView delegate method -webView:shouldStartLoadWithRequest:navigationType: to trap requests. When you see a request come through with your link in it, you know your action has been triggered.
UIWebView Expose Objective C to JavaScript
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSLog(#"scheme = %#",[[request URL] scheme]);
if([[[request URL] scheme]isEqualToString:#"myscheme"])
{
[messageLabel setText:#"HELLO!"];
return NO;
}
else return YES;
}
Make sure your view controller conforms to the UIWebViewDelegate protocol for this to work.
I have an small embedded UIWebView for my about-section of the app. When the user taps a link in there, the link opens in that small embedded UIWebView which of course has no navigation controls and isn't full-screen. I don't like that. Can I force it to open links with Safari instead?
You can implement the shouldStartLoadWithRequest method of the UIWebViewDelegate protocol to intercept link clicks. Inside that method you can use UIApplication's openURL method to cause the url to be opened in the appropriate application (ie. Safari for HTTP/HTTPS).
- (BOOL) webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL *url = [request URL];
if ([url isEqual:YOUR_HOME_URL_CONTSTANT])
return YES;
[[UIApplication sharedApplication] openURL:url];
return NO;
}
You should implement shouldStartLoadWithRequest of the UIWebViewDelegate. In here you can see when the UIWebView will start loading a URL. Then you can handle which should be loaded in this webView and which should be loaded by Safari.
My code looks like:
-(BOOL) webView:(UIWebView *)inWeb shouldStartLoadWithRequest:(NSURLRequest *)inRequest navigationType:(UIWebViewNavigationType)inType
{
if (inType != UIWebViewNavigationTypeLinkClicked)
{
//This was not a clicked link, so is probably the initial load
//and should be loaded in the UIWebView
return YES;
}
//This was a clicked link, so load using Safari
[[UIApplication sharedApplication] openURL:[inRequest URL]];
return NO;
}
Here I am using UIWebViewNavigationType to determine whether it was a link click, and responding appropriately.
So i have an app that is not so much a webapp but more uses UIViewControllers and UIViews for most screens. On one particular controller i have a UIWebView control that only occupies a small portion of the UIViewController screen real estate that i load html from a web service as a string.
[self.webView loadHTMLString:marketingBlurb baseURL:nil];
what i'm wondering is if the html links in this string can open up on the browser and not in the UIWebView in my app???? How can i do this?? Is this even possible ?
Set the delegate of the webview to self, and intercept all links using webView:shouldStartLoadWithRequest:navigationType:
You can then call [UIApplication openURL] to open Safari.
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if (navigationType == UIWebViewNavigationTypeLinkClicked) {
[[UIApplication sharedApplication] openURL:[request URL]];
return NO;
}
return YES;
}
I didn't test this code, but it will get you started.