I'm currently developing a custom keyboard app and am having trouble parsing what the keyboard has outputted onto the text document proxy. How does one go about this? I feel like I'm losing my mind. Currently I'm looping:
for letter in (proxy.documentContextBeforeInput?.characters)!
However, this is only getting the text on the line the cursor is currently on, before the cursor, such that if my textDocumentProxy contains:
Some text above
Some text below (cursor position)
My loop only iterates throught the "Some text below" portion.
Is there any way to loop through the entirety of a UITextDocumentProxy? Thank you.
documentContextBeforeInput, as its name mentions, only returns the text before the input. To get the full text string, you should do something like:
let entireText = (proxy.documentContextBeforeInput ?? "") + (proxy.documentContextAfterInput ?? "")
if let chars = entireText.characters {
for letter in chars {
//DO something useful
}
}
Related
I have a UILabel that dynamically gets updated every time I click a button, the data will be fetched from firebase and displayed on the uilabel.I am able to display the text as shown below. I would like to insert a line break when a specific delimiter(say '.' PERIOD) is encountered in the text. I have looked into many solutions about UIlabel line break but couldn't find one what exactly I am looking for, every solution deals with static text that we provide in the storyboard itself. Any help will be appreciated. Thank you.
)
Created an outlet for the label and have taken a string which has three sentences separated by ".". The content in the image attached will be this string. Try using replacingOccurences() function as given below.
#IBOutlet weak var trialLabel: UILabel!
var string = "This is a trial text.Let us jump to a new line when the full stop is encountered.Hope it helps."
string = string.replacingOccurrences(of: ".", with: ".\n")
trialLabel.text = string
Check https://developer.apple.com/documentation/foundation/nsstring/1412937-replacingoccurrences for further reference. Happy Coding!!
You can achieve this with the attributed text property of UILabel. Try to find and replace the character with html line break and then assign this text to the UILabel attributed text.
You can replace string by
let str = "This is the string to be replaced by a new string"
let replacedStr = str.replacingOccurrences(of: "string", with: "str")
use below code
// HTML Tag Remove Method
extension String{
func removeHtmlFromString(inPutString: String) -> String{
return inPutString.replacingOccurrences(of: ".", with: ".\n", options: .regularExpression, range: nil)
}
}
let str = "Lorem Ipsum is simply dummy text.Lorem Ipsum has been the industry's standard dummy text ever since the 1500."
let postDiscription = str!.removeHtmlFromString(inPutString: str!)
You can add a \n in the text string to where you want to create a line break.
I am developing a IOS custom keyboard. I was wondering if there was a way to fetch the current text inside of the text field and how it would work.
For example, we can use textDocumentProxy.hasText() to see if the textfield has text inside but I want to know the exact string that is inside the textfield.
The closest things would be textDocumentProxy.documentContextBeforeInput and textDocumentProxy.documentContextAfterInput. These will respect sentences and such, which means if the value is a paragraph, you will only get the current sentence. Users have been known to retrieve the entire string by repositioning the cursor multiple times until everything is retrieved.
Of course, you generally do not have to worry about this if the field expects a single value like a username, email, id number, etc. Combining the values of both before and after input contexts should suffice.
Sample Code
For the single phrase value, you would do:
let value = (textDocumentProxy.documentContextBeforeInput ?? "") + (textDocumentProxy.documentContextAfterInput ?? "")
For values that might contain sentence ending punctuation, it will be a little more complicated as you need to run it on a separate thread. Because of this, and the fact that you have to move the input cursor to get the full text, the cursor will visibly move. It is also unknown whether this will be accepted into the AppStore (after all, Apple probably did not add an easy way to get the full text on purpose in order to prevent official custom keyboards from invading a user's privacy).
Note: the below code is based off of this Stack Overflow answer except modified for Swift, removed unnecessary sleeps, uses strings with no custom categories, and uses a more efficient movement process.
func foo() {
dispatch_async(dispatch_queue_create("com.example.test", DISPATCH_QUEUE_SERIAL)) { () -> Void in
let string = self.fullDocumentContext()
}
}
func fullDocumentContext() {
let textDocumentProxy = self.textDocumentProxy
var before = textDocumentProxy.documentContextBeforeInput
var completePriorString = "";
// Grab everything before the cursor
while (before != nil && !before!.isEmpty) {
completePriorString = before! + completePriorString
let length = before!.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
textDocumentProxy.adjustTextPositionByCharacterOffset(-length)
NSThread.sleepForTimeInterval(0.01)
before = textDocumentProxy.documentContextBeforeInput
}
// Move the cursor back to the original position
self.textDocumentProxy.adjustTextPositionByCharacterOffset(completePriorString.characters.count)
NSThread.sleepForTimeInterval(0.01)
var after = textDocumentProxy.documentContextAfterInput
var completeAfterString = "";
// Grab everything after the cursor
while (after != nil && !after!.isEmpty) {
completeAfterString += after!
let length = after!.lengthOfBytesUsingEncoding(NSUTF8StringEncoding)
textDocumentProxy.adjustTextPositionByCharacterOffset(length)
NSThread.sleepForTimeInterval(0.01)
after = textDocumentProxy.documentContextAfterInput
}
// Go back to the original cursor position
self.textDocumentProxy.adjustTextPositionByCharacterOffset(-(completeAfterString.characters.count))
let completeString = completePriorString + completeAfterString
print(completeString)
return completeString
}
I'm replacing the selected text in a textView with the new one. To accomplish this, I'm using this code based on this answer of beyowulf. All works well, the replaced text becomes selected, the problem arises when in the text there is one ore more special characters (like emoji etc). In this case the selected text misses one ore more characters at the end of the selection.
mainTextField.replaceRange((theRange), withText: newStr) // replace old text with the new one
selectNewText(theRange, newStr: newStr) // select the new text
func selectNewText(theRange: UITextRange, newStr: String) {
let newStrLength = newStr.characters.count // let's see how long is the string
mainTextField.selectedTextRange = mainTextField.textRangeFromPosition(theRange.start, toPosition: mainTextField.positionFromPosition(theRange.start, offset: newStrLength)!)
mainTextField.becomeFirstResponder()
}
OK, after I read the answers and comments to this question, I fixed this problem by replacing this statement (which returns the "human-perceptible" number of characters):
let newStrLength = newStr.characters.count
With this one:
let newStrLength = newStr.utf16.count
PS
By the way, here is some test I done with different implementations:
let str = "Abc😬"
let count = str.characters.count
print(count) // 4
let count2 = str.utf16.count
print(count2) // 5
let count3 = str.utf8.count
print(count3) // 7
In a UITableView, I'm listing a bunch of languages to be selected. And to put a section index view to the right like in Contacts app, I'm getting all first letters of languages in the list and then use it to generate the section index view.
It works almost perfect, Just I encountered with a problem in getting first letter of some strings in Hebrew. Here a screenshot from playground, one of the language name that I couldn't get the first letter:
Problem is, the first letter of the name of the language that has "ina" language code, isn't "א", it's an empty character; it's not a space, it's just an empty character. As you can see, it's actually 12 characters in total, but when I get count of it, it says 13 characters because there is an non-space empty character in index 0.
It works perfectly if I use "eng" or "ara" languages with putting these values in value: parameter. So maybe the problem is cause of system that returns a language name with an empty character in some cases, I don't know.
I tried some different methods of getting first letter, but any of it didn't work.
Here "א" isn't the first letter, it's the second letter. So I thought maybe I can find a simple hack with that, but I want to try solving it before trying workarounds.
Here is the code:
let locale = NSLocale(localeIdentifier: "he")
let languageName = locale.displayNameForKey(NSLocaleIdentifier, value: "ina")!
let firstLetter = first(languageName)!
println(countElements(languageName))
for character in languageName {
println(character)
}
You could use an NSCharacterSet.controlCharacterSet() to test each character. I can't figure out how to stay in Swift-native strings, but here's a function that uses NSString to return the first non-control character:
func firstNonControlCharacter(str: NSString) -> String? {
let controlChars = NSCharacterSet.controlCharacterSet()
for i in 0..<str.length {
if !controlChars.characterIsMember(str.characterAtIndex(i)) {
return str.substringWithRange(NSRange(location: i, length: 1))
}
}
return nil
}
let locale = NSLocale(localeIdentifier: "he")
let languageName = locale.displayNameForKey(NSLocaleIdentifier, value: "ina")!
let firstChar = firstNonControlCharacter(languageName) // Optional("א")
I'm playing around with emojis in Swift using Xcode playground for some simple iOS8 apps. For this, I want to create something similar to a unicode/emoji map/description.
In order to do this, I need to have a loop that would allow me to print out a list of emojis. I was thinking of something along these lines
for i in 0x1F601 - 0x1F64F {
var hex = String(format:"%2X", i)
println("\u{\(hex)}") //Is there another way to create UTF8 string corresponding to emoji
}
But the println() throws an error
Expected '}'in \u{...} escape sequence.
Is there a simple way to do this which I am missing?
I understand that not all entries will correspond to an emoji. Also, I'm able create a lookup table with reference from http://apps.timwhitlock.info/emoji/tables/unicode, but I would like a lazy/easy method of achieving the same.
You can loop over those hex values with a Range: 0x1F601...0x1F64F and then create the Strings using a UnicodeScalar:
for i in 0x1F601...0x1F64F {
guard let scalar = UnicodeScalar(i) else { continue }
let c = String(scalar)
print(c)
}
Outputs:
😁😂😃😄😅😆😇😈😉😊😋😌😍😎😏😐😑😒😓😔😕😖😗😘😙😚😛😜😝😞😟😠😡😢😣😤😥😦😧😨😩😪😫😬😭😮😯😰😱😲😳😴😵😶😷😸😹😺😻😼😽😾😿🙀🙁🙂🙃🙄🙅🙆🙇🙈🙉🙊🙋🙌🙍🙎🙏
If you want all the emoji, just add another loop over an array of ranges:
// NOTE: These ranges are still just a subset of all the emoji characters;
// they seem to be all over the place...
let emojiRanges = [
0x1F601...0x1F64F,
0x2702...0x27B0,
0x1F680...0x1F6C0,
0x1F170...0x1F251
]
for range in emojiRanges {
for i in range {
guard let scalar = UnicodeScalar(i) else { continue }
let c = String(scalar)
print(c)
}
}
For those asking, the full list of available emojis can be found here: https://www.unicode.org/emoji/charts/full-emoji-list.html
A parsable list of unicode sequences for all emojis can be found in the emoji-sequences.txt file under the directory for the version you're interested in here: http://unicode.org/Public/emoji/
As of 9/15/2021 the latest version of the emoji standard available on Apple devices is 13.1.