I did a cocoa application in which the file dialog box is opening when a button is tapped with the use of NSOpenPanel controller in cocoa applications.For ipad applications we are using UISplitViewController.
I want to know that for developing the applications in iphone,what controller to be used for opening a file dialog box when a button is tapped.
For example in composing a mail.In composing a mail,if we want to attach any files from the local drive,we click the "Attach a File" button. Then it will opens a file open dialog box for selection of file what we want.
Can any one help me or suggest me what controller to be used for opening a file in iphone applications?For opening a file dialog box ,in
cocoa applications --------- Controller used is NSOpenPanel
ipad applications --------- Controller used is UISplitViewController
Like wise for i phone applications ------- ??????
Please help me out of this?
iOS doesn't have a concept of browsing arbitrary local files.
It does have the ability to browse for images from the photo library — for that you can use UIImagePickerController.
Other than photos, the only files you can even open are ones that are inside your own sandbox folder (i.e. ones that you've put there yourself). There isn't a built in view controller that will display them — you'd have to write your own that will read the list of files using something like NSFileManager contentsOfDirectoryAtPath:error:, and display them in an appropriate UI.
Related
I am looking for way to receive opened file's URL from Finder of macOS.
I implemented ZIP document type association into info.plist of an Mac-Catalyst app. So If user once associated ZIP file to my app for default app, user can double click ZIP file and launch my app.
But currently my app can't receive that opened file URL because I don't know which place/delegate function is good to receive that URL.
I believe I should implement that delegate function in SceneDelegate or AppDelegate, and I should also implement launch first viewcontroller with Storyboard manually.
This app window launching chain (that is from file double-click, to end of call viewcontroller) is very difficult for me.
Is there any help document or sample code?
Thank you.
I want to make "Open in.." function in my iOS application.
Is there any way to check if any app on this device is associated with file extension that i want to share?
If there are no apps on current device to open file with such an extension than UIDocumentInteractionController will not be displayed after clicking on "Open in.." button, but i want not to show this button in such case.
So the question is: how to check if any app on device can open some file with specific extension?
Update:
For example UIDocumentInteractionController has NSArray property icons.
It contains images of all aplications that can open the file with my extension. But if there are no applications it contans image of empty application.
So i can't check it using docInteractionController.icons.count == 0 for example. I am looking for other tricks.'
Thanks, in advance.
Although UIDocumentInteractionController does not offer a way to discover in advance whether there are any applications that can handle a document, -presentOpenInMenuFromRect: will return a flag indicating whether there were any applications that could open a document. This requires you to have already set up and presented the controller, which is not optimal.
There is a workaround for this, a little hacky but is functional: Before you invoke the "real" interaction controller, create a dummy one using a dummy document, and present it from the rect of the window's bounds. This guarantees that it will "appear" offscreen, so your user won't see it. At that point, you have the flag returned from -present, and you can immediately dismiss the dummy controller, and the proceed to show your UI appropriately.
On OSX, you can get a list of application bundle identifiers capable of handling a specific content type using LSCopyAllRoleHandlersForContentType. But on iOS, I don't think there is such a way.
If I find, I'll edit my answer.
Considering you are looking for other tricks, you can check if that one image in the icons array is the generic document icon.
If it is then you know that there is no app associated to handle that file type. But this approach will be OS version dependent as generic file icon may change.
From the official documentation:
To declare its support for file types, your app must include the
CFBundleDocumentTypes key in its Info.plistproperty list file. (See
“Core Foundation Keys”.) The system adds this information to a
registry that other apps can access through a document interaction
controller.
To me this indicates that the registry can only be accessed through UIDocumentInteractionController and so no, you would not be able to know in advance if there are any available apps for the file format (which would be totally in line with Apple's philosophy of not letting apps interact directly with each other).
UPDATE:
as you said the icons property contains an image even with no applications present. I checked and all the other methods and properties of the controller do not give an hint about the apps that may open the current file format.
You said in case that no app can open the specified file format there is an "image of empty application". Maybe you can extract that icon and when the array icons only has one image check if the extracted image and the icon are the same?
I have a native iPhone app, which has a UIWebView component to it. I am trying to see if I can replicate the "Add to Home Screen" button that is present in the tab bar options in Safari.
Is this possible inside a UIWebView within a native app?
Thanks!
Brett
[I presume your question is about replicating the action associated with add to home screen, rather than replicating the appearance of the button itself (which being pedantic is what you actually wrote).]
As others have said this isn't possible.
What you could do is programatically launch Safari from within your app and give it the URL of a page to load which is your page.
When your page is loaded it has some sort of animation and shows the user where the add to home screen button is and tell them to press it after clicking a link which is displayed in your web page. When the users click on the link it takes them to whatever page it is that you would like saved to the desktop, and you hope they follow your instructions.
If you register your app to handle a proprietary url scheme the users can get back to your app from within Safari by clicking on a link using your app's url scheme.
The web pages that you seed Safari with must however be remote pages, you cannot give Safari a page in your app's bundle or that your app has downloaded as Safari cannot read pages from your app's sandbox.
The short answer is no, you can't. Apple does not let you.
Here's a similar question which may help you come up with other possibilities:
Javascript for "Add to Home Screen" on iPhone?
If I had to think of a work around off the top of my head, you could create an javascript pop-up which instructs them how to. It could say something like tap this button to go to mobile safari then tap action -> add to home screen.
Execute the Javascript with UIWebView's method:
- (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script
Hope this helps.
You can use UIActivityViewController with your url as the activity items
NSArray *activityItems = #[title, url];
And then you can exclude the activities that you don't want. I think it´s the only way for now.
My app is registered for certain file types, images + pdf etc, following the guidelines
provided by Apple. My app does show up("open in" option) when pdf files are encountered
in mobile-safari, but it is not the case with image files. In the default "Photos"
app provided by apple, the "open in" option does not show up. Probably this is because
it is implemented without using the document interaction controller. But is there any
way to make my app appear in the UIActionSheet button, which appears at the bottom left
corner ?
I do not want to use the UIImagePickerController for choosing the saved images.
the only thing you can do is add this key-value pair to your info.plist file. iPhone saves pictures in ".JPG", so that's what you should put as the file type.
(if it doesn't appear in Photos action sheet, that means that Apple doesn't want it to appear. You'll just have to hope that some day...)
p.s. more information and detailed instructions here:
Registering the File Types Your App Supports
Is it possible to Launch Safari without having the app close? Just like the in-app email compose window.
I'm aware of how to display a webpage in UIWebView. I'd like to use a full web browser, i.e. Safari.
You can use a UIWebView to display web content in your app.
You can create a UIWebView with the URL to display. It will follow any links that the user touches, but that won't give you the address bar, search, navigation buttons, bookmarks or the page (tab) control. Those you'll have to add yourself, but odds are you don't want all of that. (Do you really need Google searches in your app?)
Creating a controller to manage a UIWebView and as much or as little navigation as you need is pretty easy. With a little planning, your custom controller class will also a good thing to keep in your library for the next app.
No you can not make use of the full Safari from within your own application. Your application must terminate for Safari to open.
In iPhone OS 2.0 you also had to terminate in order to send e-mails, so some chance exists that Apple couls open up Safari in the same way for iPhone OS 4.0. Make sure to request it at http://bugreport.apple.com if you are eager.
The second best option currently available is to roll your own "Browser view controller" using UIWebView. Let it have back, forward, stop/reload buttons, and an extra button for opening in Safari if the user is not content. This is how many of the greatest apps our there, like Tweetie, does it.