What is the need of undo manager in iphone? I never see such buttons in sample programs. I know the meaning and the use of undo & redo. But my question here is, For which purpose, i need it? How to use it in my application? Also suggest a good example code link if you know...
Thank you
Undo is used in many apps, including most or all of the Apple built-in ones wherever text editing occurs. Type or change some text in Mail or Safari and then shake your phone; you'll see an AlertView pop up asking you if you'd like to undo your text change.
There's a pretty good tutorial here:
Mobile Orchard: Shake To Undo/Redo, NSUndoManager
Related
I'm not sure of the correct name, but I am wondering how to create (in Objective-C) a transparent notification "window/panel", such as is shown when you change the volume intensity, or keyboard illumination, or display brightness. I want to put my own icon/text on it, for my own notification.
I don't know the words to Google for, so I'm asking here.
Thanks for any suggestions.
Matt Gemmell's RoundedFloatingPanel component on his sample code page may do just what you're looking for.
After looking into using the solutions provided by the other two given answers, I found that they would not work for my purposes. So, I wrote up my own library:
BHBezelNotification
Growl is a widely-used implementation of this. By default, it doesn't look exactly like the system overlays, though it is skinnable - you probably want the Bezel notification:
See the Growl Developer Documentation for more.
I've seen that this question has been asked a few times, but no one seems to have an answer. I am trying to create an autocorrect feature on a custom keyboard, but I am completely lost as to how to do so. Apple gives some documentation, but it's not very detailed. I know it has something to do with UILexicon data, but I'm not sure what to do with it and how to use it to correct strings of text the user is typing.
Any help would be greatly appreciated.
What I have found so far:
let controller = UIInputViewController()
controller.requestSupplementaryLexiconWithCompletion({
lexicon in
println(lexicon.description)
})
But this is as far as I've gotten. Not sure what to do from here.
You are asking a very difficult question. In short, there is no built in access to autocorrect on iOS8; there is also no access to the APIs on iOS that allow the system to do things like show the red 'possible error' underline effect, or to other aspects of the system autocorrect behaviour, such as the in-place suggestion dialog (on iOS 7, or if you do not have the suggestions bar visible) or the 'will correct' blue background (on iOS 8).
things you can't do:
in-place error indicator
in-place autocorrect dialog
suggestions bar autocorrect indicator
what you can do is write your own autocorrect engine, from scratch, including both your own text processing and analysis and your own user-interface idioms. This has to all be done with the limitation that you are not able to draw outside of your keyboard's bounds, and you cannot modify anything else on screen. A number of third-party keyboards do this, such as minuum and swiftkey (disclaimer: I work on minuum) but it is a non-incidental amount of work. If you're interested in playing around with this, a good place to start might be the built in UITextChecker class, although auto-correction is ultimately a problem distinct from spell-checking.
UILexicon is only useful once you've already implemented things; all that it really offers you is a list of words that you can use to supplement whatever dictionary you're using, as well as to implement any text shortcuts your user might have added in their system settings. It is not, on its own, enough to build an auto-correction system from.
addendum:
How to Write a Spelling Corrector is a great little essay / tutorial by Peter Norvig that you might find interesting, and that I would recommend even if you're not trying to write auto-correct.
In my app I want the user to type names into a UITextField (or equivalent) and then when they press return, it will put that word(s) in a blue bubble that's usually associated with tags. The cursor then moves to the end where they can add more "tags".
This can be seen when adding contacts in the To, CC & BCC fields in the Mail app, and also when selecting contacts in the Messages app.
How is this done? Is it something that's provided in the UIKit or available somewhere else?
Many thanks,
Michael
Venmo just open sourced their token field.
https://github.com/venmo/VENTokenField.git
edited:
The equivalent control in desktop Cocoa is an NSTokenField, but there doesn't seem to be an equivalent for Cocoa Touch.
Since iOS 13 there exists UISearchTextField.
https://developer.apple.com/documentation/uikit/uisearchtextfield
You can see that component in action in the Photos App.
That should fit for many use cases. By removing the leftView you can also get rid of the search icon.
But be aware: You can‘t mix text and tokens at various positions.
From the docs:
Tokens always occur contiguously before any text in the search field.
Adding this here for reference:
Feel free to check out TaggerKit (a library I made), it's more or less what OP was talking about. You can basically add tags functionality to your app by just adding a view and a couple of properties.
I dont think you can do it with any built in functionality in the SDK, never seen such a feature. What you could do however is implement it yourself, have some custom blue button with some text over it, and when the user hits return you can have some code that takes the text and returns you the button that you need, shouldnt be too bad to implement
I am wondering how Amazon did the highlight/note popup buttons in the Kindle app. After reading about UIPasteboard, UIMenuController, UIResponder, and UIResponderStandardEditActions, I am able to turn on or off standard edit actions (i.e. copy, cut, paste, select, and selectAll). However I haven't found a way to add a custom action yet. I would really appreciate it if I could get a pointer.
Thanks in advance!
Chris
(source: sampletheweb.com)
Edited by balexandre (added image instead link)
It looks like Amazon implemented their own custom view that mimicked the appearance of UIMenuController. I believe they did this rather than use SPI because if you click and hold on the Highlight cell, the arrow does not highlight, when it does in the real UIMenuController.
I don’t think there is a public interface to these controls, you’d probably have to code them yourself. (Or maybe figure out the private API, but that’s a slippery slope.) I am not sure about that, though, maybe somebody will prove me wrong.
That's a good point about the arrow part of the Notes/Highlight popup menu not highlighting, so they must be implementing their own.
However they are also obviously using a UIWebView, because it's recognizing tap and hold and they can highlight the text, and you can't get touch events from a UIWebView, much less get the information about what's selected. So how are they doing that?
This would be very useful for us to be able to do as well.
Use DTMenuController http://www.drobnik.com/touch/2010/01/dr-touchs-parts-store/
Costs 100 EUR ^_^
Custom menu items can be added via the UIMenuController's menuItems property. See Apple's UIMenuController docs.
the javascript part can be managed with jQuery, that's a fair simple and powerful library. i'm using it for resizing and rearranging things in a webview and it works great :)
In my app I want the user to type names into a UITextField (or equivalent) and then when they press return, it will put that word(s) in a blue bubble that's usually associated with tags. The cursor then moves to the end where they can add more "tags".
This can be seen when adding contacts in the To, CC & BCC fields in the Mail app, and also when selecting contacts in the Messages app.
How is this done? Is it something that's provided in the UIKit or available somewhere else?
Many thanks,
Michael
Venmo just open sourced their token field.
https://github.com/venmo/VENTokenField.git
edited:
The equivalent control in desktop Cocoa is an NSTokenField, but there doesn't seem to be an equivalent for Cocoa Touch.
Since iOS 13 there exists UISearchTextField.
https://developer.apple.com/documentation/uikit/uisearchtextfield
You can see that component in action in the Photos App.
That should fit for many use cases. By removing the leftView you can also get rid of the search icon.
But be aware: You can‘t mix text and tokens at various positions.
From the docs:
Tokens always occur contiguously before any text in the search field.
Adding this here for reference:
Feel free to check out TaggerKit (a library I made), it's more or less what OP was talking about. You can basically add tags functionality to your app by just adding a view and a couple of properties.
I dont think you can do it with any built in functionality in the SDK, never seen such a feature. What you could do however is implement it yourself, have some custom blue button with some text over it, and when the user hits return you can have some code that takes the text and returns you the button that you need, shouldnt be too bad to implement