I am trying to get all characters in an array, when user types something.
In my codes; when I type “hello” and print it, I get:
arrRegular: [“h”]
arrRegular: [“e”]
arrRegular: [“l”]
arrRegular: [“l”]
arrRegular: [“o”]
How can I make all characters in one array, like [“h”, “e”, “l”, “l”, “o”]
My codes:
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
var arrRegular = [String]()
var arrBold = [String]()
var arrCombined = [String]()
if boldFont == false {
arrRegular.append(text)
} else {
arrBold.append(text)
}
arrCombined.append(contentsOf: arrRegular)
arrCombined.append(contentsOf: arrBold)
print(arrCombined)
return true
}
your var var arr = [String]() is local and is created every call of shouldChangeTextIn which is called every type of a character
You need to
let arr = Array(textView.text!)
or
let arr = textView.text.map { "\($0)" }
print(arr)
let text = textView.text ?? ""
let array = Array(text)
Related
I have an array of [(userID: String, friendBool: Bool)] that I want to filter AND convert to an array of userID's only [String] (removing the friendBool and therefore changing the element). Is there a function in Swift for doing this?
Currently, I am filtering on the array and then using a for loop on the filtered array [(userID: String, friendBool: Bool)] to convert it to an array of [String]. Is there a better way to do this?
Current Code:
let friendArray = [(userID: String, friendBool: Bool)]()
let excludeUsers = [String]()
//Updates with user actions
var userArrayForTableView = [String]()
//Filter friendArray
let newArray = friendArray.filter { (existingFriend) -> Bool in
return !excludeUsers.contains(existingFriend.userID)
}
//Convert array fro [(userID: String, friendBool: Bool)] to [String]
for existingFriend in newArray {
userArrayForTableView.append(existingFriend.userID)
}
What I'm trying to do:
//Loaded on ViewDidLoad
let friendArray = [(userID: String, friendBool: Bool)]()
let excludeUsers = [String]()
//Updates with user actions
var userArrayForTableView = [String]()
//Filter friendArray
/*
Below fitler returns an array of [(userID: String, friendBool: Bool)]...
but I want a filter to return an array of [String] for just userIDs
*/
let newArray = friendArray.filter { (existingFriend) -> Bool in
return !excludeUsers.contains(existingFriend.userID)
}
//ERROR HERE because 'newArray' is not [String]
userArrayForTableView.append(contentsOf: newArray)
What about using compactMap()?
In a certain way, it can be understood as a filter() (that you are already using) + map() (which is the loop for existingFriend in newArray in the first solution)
let userArrayForTableView = friendArray.compactMap({ (existingFriend) in
if excludeUsers.contains($0.userID) {
return nil
} else {
return existingFriend.id
}
})
In a shorter way:
let userArrayForTableView = friendArray.compactMap({ excludeUsers.contains($0.userID) ? nil : $0.userID })
My JSON data look like this image below. Now I wanna merge the value of Shop Type and Promotion into one to use as collection view data. How can I do that?
I just filter the response data from the server like this:
var dataBanDau: [SDFilterModel] = []
var quickData: [SDFilterModel] = []
let filters: [SDFilterModel] = data
self.filterEntries = filters
//let nsarray = NSArray(array: self.filterEntries! , copyItems: true)
// self.filterEntriesStoreConstant = nsarray as! Array
self.dataBanDau = filters
for i in 0..<self.dataBanDau.count {
if self.dataBanDau[i].search_key.count == 0 {
self.quickData.append(self.dataBanDau[i])
}
}
self.quickData = self.quickData.filter {
$0.type != "range"
}
DispatchQueue.main.async {
//Note: Reload TableView
self.quickFilterCollection.reloadData()
completed(true)
}
}
the class SDFilterModel:
class SDFilterModel: DSBaseModel {
var name = String()
var type = String()
var is_expanded = Int()
var search_key = String()
var filterEntries : [SDFilterModel]?
override func copy(with zone: NSZone? = nil) -> Any {
// This is the reason why `init(_ model: GameModel)`
// must be required, because `GameModel` is not `final`.
let copy = SDFilterModel(dict: self.dictionary)
if let arrAttribute = NSArray(array: self.value , copyItems: true) as? [AttributeValueModel] {
copy.value = arrAttribute
}
return copy
}
override init(dict: Dictionary<String, Any>) {
super.init(dict: dict);
value = self.valueParse()
name = dict.getString(forKey: "name")
type = dict.getString(forKey: "type")
search_key = dict.getString(forKey: "search_key")
is_expanded = dict.getInt(forKey: "is_expanded")!
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
var value: [AttributeValueModel] = [];
func valueParse()-> [AttributeValueModel] {
guard let childs = (self.dictionary["value"]) as? [Dictionary<String, AnyObject>]
else { return [] }
var output: [AttributeValueModel] = [];
for aDict in childs {
let item = AttributeValueModel(dict:aDict);
// if type == .Range && item.option_id == "0" {
// item.setRangeOptionID(aValue: item.option_name!)
// }
//
output.append(item);
}
return output;
}
Let be Assume you have let myArray = [1,2,3,4,5,6,7,8]
Now you wanted to square of each and every element in the array,
With for loop you do like this
for item in myArray {
print(item * item)
}
Now assume item = $0
With for map you jus do
myArray.map({ $0 * $0 })
Both will gave same output.
map : Use to do same operation on every element of array.
flatmap : It is used to flattern the array of array.
let myArr = [[1,2,3],[4,5,6,7]]
and you want o/p as [1,2,3,4,5,6,7]
So can get above output with myArr.flatMap({$0})
Now back to your question.
let reqArray = myModel.data.map({ $0.value }).flatMap({ $0 })
First, map gaves you array-of-array of key value but you need a single array, so for that you need to use flatmap.
You can take ref : https://medium.com/#Dougly/higher-order-functions-in-swift-sorted-map-filter-reduce-dff60b5b6adf
Create the models like this
struct Option {
let name: String
let searchKey: String
let id: String
}
struct Model {
let type: String
let name: String
let isExpanded: Bool
let value: [Option]
}
You should get the options array values and join all the arrays
let models:[Model] = //...
let collectionViewArray = models.map { $0.value }.reduce([Option](), +)
Using for loop
var collectionViewArray = [Option]()
for model in models {
collectionViewArray.append(contentsOf: model.value)
}
Ok, so I have an app that is designed for roleplaying. I have a guide that guides the user to creating the character. So the first thing the user has to do is put the character number. So I want it to search all the records for the attribute I have called characternumber and see what the largest number is.
Example: Lets say I have 5 characters. with character numbers 1,2,3,4,5. I want to cycle through all the records and see that 5 is the biggest number than automatically place a 6 in the character number text field.
This is what I have so far:
#IBOutlet var societyNumberTxt: UITextField!
#IBOutlet var characterNumberTxt: UITextField!
let managedObjectContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var characters: [NSManagedObject] = []
var societyNum: [NSManagedObject] = []
var charNum: [String] = []
override func viewDidLoad()
{
super.viewDidLoad()
//1
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
//2
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Characters")
//3
do {
societyNum = try managedContext.fetch(fetchRequest)
let entityDescription = NSEntityDescription.entity(forEntityName: "Characters", in: managedObjectContext)
let request: NSFetchRequest<Characters> = Characters.fetchRequest()
request.entity = entityDescription
var results = try managedObjectContext.fetch(request as! NSFetchRequest<NSFetchRequestResult>)
if societyNum.count > 0
{
let match = results[0] as! NSManagedObject
societyNumberTxt.text = (match.value(forKey: "societynumber") as? String)!
print(match)
if (match.value(forKey: "characternumber") != nil)
{
self.charNum = match.value(forKey: "characternumber") as! [String]
print(self.charNum)
}
else
{
print("empty array")
characterNumberTxt.text = "1"
}
}
else
{
societyNumberTxt.placeholder = "Society # not set"
}
} catch let error as NSError {
print("Could not fetch. \(error), \(error.userInfo)")
}
}
I am not sure how to cycle through every record and check the attribute and place in the array. I have tried something like this:
var i = 0
for i in results
{
var match = results[i] as? NSManagedObject
charNum[i] = match
}
I get the error:
cannot subscript a value of type '[Any]' with an index of type 'Any'
Now to test my code for the if statement:
if (match.value(forKey: "characternumber") != nil)
{
self.charNum = match.value(forKey: "characternumber") as! [String]
print(self.charNum)
}
It returned and error:
Could not cast value of type 'NSTaggedPointerString' (0x108578d10) to 'NSArray' (0x108578dd8).
Am I even on the right past?
Adjust your fetch request with a SortDescriptor instead of finding the highest characterNumber manually:
...
//2
// get all characters ...
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Characters")
// ... sorted by characternumber in acending order
let sortDescriptor = NSSortDescriptor(key: "characternumber", ascending: true)
let sortDescriptors = [sortDescriptor]
fetchRequest.sortDescriptors = sortDescriptors
//3
do {
let characters = try managedContext.fetch(fetchRequest) as! [Characters]
if let highestCharacterNumber = characters.last?.characternumber {
characterNumberTxt.text = String(highestCharacterNumber + 1) // assuming characternumber is of type Int
} else {
characterNumberTxt.text = "1"
}
} ...
I am trying to create an array of words from a string object retrieved from Parse. The object retrieved looks like this:
Then this line of code gives this.
let joinedWords = object["Words"] as! String
How do I convert joinedWords to an Array?
If you don't care about the order, you can use flatMap on the set:
var mySet = Set<String>()
for index in 1...5 {
mySet.insert("testwords\(index)")
}
let myArray = mySet.flatMap { $0 }
print(myArray) // "["testwords5", "testwords3", "testwords4", "testwords2", "testwords1"]"
If you want the list sorted alphabetically, you can make your array a var and use sortInPlace()
var myArray = mySet.flatMap { $0 }
myArray.sortInPlace()
print(myArray) // "["testwords1", "testwords2", "testwords3", "testwords4", "testwords5"]"
If object["Words"] is AnyObject, you will have to unwrap it.
if let joinedWordsSet = object["Words"] as? Set<String> {
var joinedWordsArray = joinedWordsSet.flatMap { $0 }
myArray.sortInPlace()
print(myArray)
}
Swift 3 note: sortInPlace() has been renamed sort().
Many thanks to #JAL for so much time on chat to solve this one. This is what we came up with. Its a bodge and no doubt there is a better way!
When uploading to Parse save the set as an array.
let wordsSet = (wordList?.words?.valueForKey("wordName"))! as! NSSet
let wordsArray = Array(wordsSet)
Then it saves to Parse - looking like a set, not an array or a dictionary.
let parseWordList = PFObject(className: "WordList")
parseWordList.setObject("\(wordsArray)", forKey: "Words")
parseWordList.saveInBackgroundWithBlock { (succeeded, error) -> Void in
if succeeded {
// Do something
} else {
print("Error: \(error) \(error?.userInfo)")
}
}
Then you can drop the [ ] off the string when its downloaded from Parse, and remove the , and add some "" and voila, there is an array that can be used e.g. to add to CoreData.
var joinedWords = object["Words"] as! String
joinedWords = String(joinedWords.characters.dropFirst())
joinedWords = String(joinedWords.characters.dropLast())
let joinedWordsArray = joinedWords.characters.split() {$0 == ","}.map{ String($0) } // Thanks #JAL!
Let say I have values like this
Apple(100)
Orange(300)
Pineapple(10)
Grape(50)
Banana(1000)
What I want to do is to create an array which was like that to each string
["Apple","100"]
["Orange","300"]
What i tried was like that,but it doesn't meet my answer well enough
var myNewFruits = "Apple(200)"
var newStr = myNewFruits.componentsSeparatedByString("(")
The Output was
["Apple","200)"]
What i really want was
["Apple","200"]
Is there any help with Swift?Thank you.Because I am creating search with that,so,i really need it.
You can use a custom NSCharacterSet and get the first two elements from the returned array:
let myNewFruits = "Apple(200)"
let newStr = myNewFruits.componentsSeparatedByCharactersInSet(NSCharacterSet(charactersInString: "()"))[0...1] // ["Apple", "200"]
You can do it this way:
func stringToArr(str: String) -> [String] {
var newArr = [String]()
var fullNameArr = split(str) {$0 == "("}
newArr.append(fullNameArr[0])
var last: String? = fullNameArr.count > 1 ? fullNameArr[1] : nil
newArr.append(last!.stringByReplacingOccurrencesOfString(")", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil))
return newArr
}
var string = "Apple(100)" //"Apple(100)"
let newArr = stringToArr(string) //["Apple", "100"]