I have dictionary like this
var dict : [String : Array<String>] = ["Fruits" : ["Mango", "Apple", "Banana"],"Flowers" : ["Rose", "Lotus","Jasmine"],"Vegetables" : ["Tomato", "Potato","Chilli"]]
I want to get values in array for each key How to get it in swift?
2½ years and no-one mentioned map?
ok, set aside that Dictionary has a property values(as ameenihad shows) which will do what you asking for, you could do:
let values = dict.map { $0.value }
try this:
for (key, value) in dict {
println("key=\(key), value=\(value)")
}
Try to get values as like following code
let fruits = dict["Fruits"]
let flowers = dict["Flowers"]
let vegetables = dict["Vegetables"]
Try:
var a:Array = dict["Fruits"]! ;
println(a[0])//mango
println(a[1])//apple
for val in dict.values {
print("Value -> \(val)")
}
EDIT:
Try Something like this,
var dict : [String : Array<String>] = [
"Fruits" : ["Mango", "Apple", "Banana"],
"Flowers" : ["Rose", "Lotus","Jasmine"],
"Vegetables" : ["Tomato", "Potato","Chilli"]
]
var myArray : Array<String> = []
// You can access the dictionary(dict) by the keys(Flowers, Flowers, Vegetables)
// Here I'm appending the array(myArray), by the accessed values.
myArray += dict["Fruits"]!
myArray += dict["Vegetables"]!
print("myArray \(myArray)")
Above is how to get values of dictionay in swift,
If you want to get contatenated array of all the values of
dictionary(*only values),
Try something like below.
print("values array : \(dict.map{$0.value}.flatMap{$0})")
values array : ["Rose", "Lotus", "Jasmine", "Tomato", "Potato",
"Chilli", "Mango", "Apple", "Banana"]
Related
Swift Xcode version 13.2.1
Here we have two Arrays,(1)var dicSearch=String and (2)var searchingDic: [[String: Any]]=[] I want to assign searchingDic to dicSearch when i implement it than it show error like, Cannot assign value of type '[String]' to type '[[String : Any]]'
here's my code, please anyone help!
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
searchingDic = dicSearch.filter{filtering in
let filterService = filtering["fName"] as? String
return((filterService?.lowercased().contains(searchText.lowercased()))!)
}
It looks like you are trying to create a filtered list based on a search term, but your dicSearch type is an array of strings (i.e: [String]), while your searchingDic is an array of dictionaries (i.e: [[String : Any]]).
This might be confusing when coming from a different language, but in Swift, the following declaration is a dictionary:
var dict: [String: Any] = [
"key1": "value1",
"key2": "value2",
]
so the following:
var arrayOfdicts: [[String: Any]] = [
["foo": "bar"],
["apples": "oranges"],
dict
]
is actually an array, containing a list of dictionaries, notice how I've put the dict declared above in the second array.
The compiler is telling you that you cannot assign a '[String]' to type '[[String : Any]]'
because this:
// example to an array of strings
var fullList: [String] = [
"apples",
"bananas",
"cucumbers"
]
// is not the same as
var arrayOfdicts: [[String: Any]] = [
["foo": "bar"],
["apples": "oranges"],
dict
]
The Array#filter method, iterates the array itself, and returns a new array with only the elements that return true in the return statement.
so either both your arrays need to be [String] or both your arrays need to be [[String:Any]]
example for String arrays:
// array
var fullList: [String] = [
"apples",
"bananas",
"cucumbers"
]
var filteredList: [String] = []
var searchTerm = "b"
filteredList = fullList.filter{ item in
let value = item
return value.lowercased().contains(searchTerm)
}
print(filteredList) // prints ["bananas", "cucumbers"]
an example for filtering with array of dictionaries:
var people: [[String: Any]] = [
["name": "Joe"],
["name": "Sam"],
["name": "Natalie"],
["name": "Eve"]
]
var filteredPeople: [[String: Any]] = []
var nameFilter = "a"
filteredPeople = people.filter{ item in
let value = item["name"] as! String
return value.lowercased().contains(nameFilter)
}
print(filteredPeople) // prints [["name": "Sam"], ["name": "Natalie"]]
Hope this helps :)
I've two cases where I need to convert strings to different formats.
for ex:
case 1:
string inputs: abc, xyz, mno, & llr // All Strings from a dictionary
output: ["abc","xyz", "mno", "llr"] //I need to get the String array like this.
But when I use this code:
var stringBuilder:[String] = [];
for i in 0..<4 {
stringBuilder.append("abc"); //Appends all four Strings from a Dictionary
}
print(stringBuilder); //Output is 0: abc, 1:xyz like that, how to get desired format of that array like ["abc", "xyz"];
Real usage:
let arr = Array(stringReturn.values);
//print(arr) // Great, it prints ["abc","xyz"];
let context = JSContext()
context?.evaluateScript(stringBuilder)
let testFunction = context?.objectForKeyedSubscript("KK")
let result = testFunction?.call(withArguments:arr); // Here when I debugger enabled array is passed to call() like 0:"abc" 1:"xyz". where as it should be passed as above print.
Secondly how to replace escape chars in swift: I used "\" in replaceOccurances(of:"\\'" with:"'"); but its unchanged. why and how to escape that sequnce.
case 2:
string input: \'abc\'
output: 'abc'
To get all values of your dictionary as an array you can use the values property of the dictionary:
let dictionary: Dictionary<String, Any> = [
"key_a": "value_a",
"key_b": "value_b",
"key_c": "value_c",
"key_d": "value_d",
"key_e": 3
]
let values = Array(dictionary.values)
// values: ["value_a", "value_b", "value_c", "value_d", 3]
With filter you can ignore all values of your dictionary that are not of type String:
let stringValues = values.filter({ $0 is String }) as! [String]
// stringValues: ["value_a", "value_b", "value_c", "value_d"]
With map you can transform the values of stringValues and apply your replacingOccurrences function:
let adjustedValues = stringValues.map({ $0.replacingOccurrences(of: "value_", with: "") })
// adjustedValues: ["a", "b", "c", "d"]
Why not try something like this? For part 1 of the question that is:
var stringReturn: Dictionary = Dictionary<String,Any>()
stringReturn = ["0": "abc","1": "def","2": "ghi"]
print(stringReturn)
var stringBuilder = [String]()
for i in stringReturn {
stringBuilder.append(String(describing: i.value))
}
print(stringBuilder)
Also, part 2 seems to be trivial unless I'm not mistaken
var escaped: String = "\'abc\'"
print(escaped)
case 1:
I have Implemented this solutions, Hope this will solve your problem
let dict: [String: String] = ["0": "Abc", "1": "CDF", "2": "GHJ"]
var array: [String] = []
for (k, v) in dict.enumerated() {
print(k)
print(v.value)
array.append(v.value)
}
print(array)
case 2:
var str = "\'abc\'"
print(str.replacingOccurrences(of: "\'", with: ""))
I have a collection view made up of 4 sections.
Each section is an array of strings, like this:
var picList: [String] = ["Bird", "Cat", "Cow", "Dog", "Duck", "Elephant", "Fish", "Giraffe", "Lion", "Mouse", "Sheep", "Snake" ]
var vehiclesList: [String] = ["Airplane", "Ambulance", "Boat", "Bus", "Car", "Fire_Engine", "Helicopter", "Motorcycle", "Tank", "Tractor", "Train", "Truck" ]
var fruitsList: [String] = ["Apple", "Banana", "Grapes", "Mango", "Orange", "Peach", "Pineapple", "Strawberry", "Watermelon" ]
var bodyPartsList: [String] = ["Arm", "Ear", "Eye", "Face", "Feet", "Hand", "Hair", "Legs", "Mouth", "Nose" ]
I created a UITapGestureRecognizer for the cell, that when I click on the cell, I get the index.
Here is the tapMethod
func handleTap(sender: UITapGestureRecognizer) {
print("tap")
if let indexPath = self.collectionView?.indexPathForItem(at: sender.location(in: self.collectionView)) {
let cell = collectionView?.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PicViewCell
print("index path: + \(indexPath)")
} else {
print("")
}
}
Now the index prints like this [0,0] (if I press on the first item, ie bird). [2,4] if I press on the 4th item in the 2nd secion (ie mango). But I don't know how to translate the index, to get the corresponding string value. I mean something like this:
var itemName: String = [2,4] (and itemName would be mango)
I'm new to swift, so any help would be great.
Thanks so much.
What you need is an array of arrays, aka a 2D array - [[String]].
var array = [picList, vehicleList, fruitsList, bodyPartsList]
Then, you can access this with 2 indices like this:
var itemName = array[2][4]
You can create a two dimensional array, and add there your lists, indexpath.section will be the index of list and indexpath.item will be the index in thst list
In Swift 3 playground, I want to create a mutable array with numbers at some indices and Strings at others. I get errors doing this:
var playerInfo = [[String]]()
playerInfo[0][2] = "Adam" //Error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_1386_INVOP, subcode=0x0)
playerInfo[0][3] = "Martinez"
playerInfo[0][1] = "00"
EDIT:
Something like this?
var playerInfo: [[String:Any]] = [
[
"playerNumber" : "00",
"playerFirstName" : "Adam",
"playerLastName" : "Martinez"
]
]
You are not using the syntax correctly.
Try this:
var playerInfo = [[String]]()
playerInfo.append(["00","Adam","Martinez"])
EDIT
For your edit, you need a Dictionary:
var playerInfo = Dictionary<String, Any>()
playerInfo["playerNumber"] = "00"
playerInfo["playerFirstName"] = "Adam"
playerInfo["playerLastName"] = "Martinez"
I have a dictionary, which looks like this:
var dict = [["number" : "1" ], ["number" : "2" ], ["number" : "3" ]]
Now I would like to add new value "level" : "(number of level)" to each index in my dictionary, and it should looks like that:
var dict = [["number" : "1", "level" : "one"], ["number" : "2", "level" : "two" ], ["number" : "3", "level" : "three" ]]
How can I add some value inside existing dictionary in this case?
What you have listed as a dictionary is actually an array of dictionaries. You can add an element to each of the directories by simply iterating the array.
You can use an NSNumberFormatter to convert the digits you have into equivalent words:
var anArray=[["number":"1"],["number":"2"],["number":"3"]]
let numberFormatter=NSNumberFormatter()
numberFormatter.numberStyle=NSNumberFormatterStyle.SpellOutStyle
for i in 0..<anArray.count {
if let numberString=anArray[i]["number"] {
if let number=Int(numberString) {
anArray[i]["level"]=numberFormatter.stringFromNumber(number)
}
}
}
As Paulw11 pointed out, you could use NSNumberFormatter to convert the digits to words:
let dictArray = [["number" : "1" ], ["number" : "2" ], ["number" : "3" ]]
let numberFormatter = NSNumberFormatter()
numberFormatter.numberStyle = NSNumberFormatterStyle.SpellOutStyle
let mappedDictArray = dictArray.map { var d = $0; d["level"] = numberFormatter.stringFromNumber(number); return d; }
However, if you're interested in using the level key only for UI purposes, you'd be better writing a Dictionary extension, as there's no point is storing a redundant value:
extension Dictionary {
func levelString() -> String {
let numberFormatter = NSNumberFormatter()
numberFormatter.numberStyle = NSNumberFormatterStyle.SpellOutStyle
return numberFormatter.stringFromNumber(self["number"] as? Int ?? 0)
}
}
which can be used like this:
dictArray[0].level()