I'm trying to add multiple objects to NSDictionary, like
var myDict: NSDictionary = [["fname": "abc", "lname": "def"], ["fname": "ghi", "lname": "jkl"], ...]
Is it even possible to do this? If not, please suggest a better way. I actually need to convert this NSDictionary to JSON string and send that to the server, so I need multiple objects in NSDictionary.
You can definitely make a dictionary of dictionaries. However, you need a different syntax for that:
var myDictOfDict:NSDictionary = [
"a" : ["fname": "abc", "lname": "def"]
, "b" : ["fname": "ghi", "lname": "jkl"]
, ... : ...
]
What you have looks like an array of dictionaries, though:
var myArrayOfDict: NSArray = [
["fname": "abc", "lname": "def"]
, ["fname": "ghi", "lname": "jkl"]
, ...
]
To get JSON that looks like this
{"Data": [{"User": myDict1}, {"User": myDict1},...]}
you need to add the above array to a dictionary, like this:
var myDict:NSDictionary = ["Data" : myArrayOfDict]
SWIFT 3.0
List item
Frist of all you can create NSArray and Then you can Set Array in NSMutableDictionary using setvalue(forKey:) default method.
var arrFname : NSArray!
arrFname = ["abc","xyz","mno"]
var arrLname : NSArray!
arrFname = ["tuv","xuv","swift"]
var dicSet : NSMutableDictionary!
dicSet.setObject(arrFname, forKey : "Fname")
dicSet.setObject(arrLname, forKey : "Lname")
print(dicSet)
var tempDict = NSMutableDictionary()
tempDict.setValue("sam", forKey : "one")
print(tempDict["one"] ?? "1")
Related
I 'm having an array of dictionary like so...
[
{
"id" : "3",
"sellingPrice" : "520",
"quantity" : "15"
},
{
"id" : "5",
"sellingPrice" : "499",
"quantity" : "-1"
},
{
"id" : "8",
"sellingPrice" : "500",
"quantity" : "79"
}
]
Now I want to add to the dictionary another key called remaining_balance with a value of 420,499 & 500 respectively. How can I achieve this..? Hope somebody can help...
It seems like you want to add a value to your dictionary that is an array:
var arrDict = Array<Dictionary<String,Any>>() //Your array
arrDict.append(["id":"3","sellingPrice":"520","quantity":"13"])
arrDict.append(["id":"5","sellingPrice":"43","quantity":"32"])
arrDict.append(["id":"8","sellingPrice":"43","quantity":"33"])
let arrValue = ["420","499","500"] //Your remaining value in array
print("Before ",arrDict)
for (index,dict) in arrDict.enumerated() {
var dictCopy = dict //assign to var variable
dictCopy["remaining_balance"] = arrValue[index]
arrDict[index] = dictCopy //Replace at index with new dictionary
}
print("After ",arrDict)
EDIT
If you are able keep an index of an array it would be possible,
Assuming that you have the index of an array
var dictCopy = arrDict[index]
dictCopy["remaining_balance"] = "666" //Your calculated value
arrDict[index] = dictCopy //Replace at index with new dictionary
var newKV = [["remaining_balance": "420"],["remaining_balance": "490"],["remaining_balance": "500"]]
let array = [["id":"3", "sellingPrice":"520", "quantity":"15"], ["id":"5", "sellingPrice":"520", "quantity":"15"], ["id":"8", "sellingPrice":"520", "quantity":"15"]]
let newArray = array.enumerated().map { (index : Int, value: [String: String]) -> [String: String] in
var dic = value
dic.merge(newKV[index]) { (_, new) -> String in
new
}
return dic
}
You could achieve it by mapping your array:
var myArray = [["id": "3", "sellingPrice": "520", "quantity" : "15"], ["id": "5", "sellingPrice": "499", "quantity" : "-1"], ["id": "8", "sellingPrice": "500", "quantity" : "79"]]
print(myArray)
/*
[["id": "3", "sellingPrice": "520", "quantity": "15"],
["id": "5", "sellingPrice": "499", "quantity": "-1"],
["id": "8", "sellingPrice": "500", "quantity": "79"]]
*/
print("___________________")
var remainingBalanceDesriedValue = 420
myArray = myArray.map { (dict: [String: String]) -> [String: String] in
var copyDict = dict
copyDict["remaining_balance"] = "\(remainingBalanceDesriedValue)"
remainingBalanceDesriedValue = (remainingBalanceDesriedValue == 420) ? 499 : (remainingBalanceDesriedValue == 499) ? 500 : 420
return copyDict
}
print(myArray)
/*
[["sellingPrice": "520", "quantity": "15", "id": "3", "remaining_balance": "420"],
["sellingPrice": "499", "quantity": "-1", "id": "5", "remaining_balance": "499"],
["sellingPrice": "500", "quantity": "79", "id": "8", "remaining_balance": "500"]]
*/
Let's assume you have an array of dictionaries like so:
var arrayOfDictionaries = [
[
"id": 3,
"sellingPrice": 520,
"quantity": 15
]
]
It is important that arrayOfDictionaries is not a let constant, otherwise it is considered immutable and you can not call append on it.
Now you init a new dictionary like:
let newDictionary = [
"id": 10,
"remaining_balance": 420,
"quantity": 15
]
Now add the newDictionary like
arrayOfDictionaries.append(newDictionary)
If the order is important
If the order is important there are a couple of ways to go about that.
When calling append the new value (in this case the new dictionary) will always be inserted at the bottom of the array.
If for some reason you can not call append in the correct order you could use insert, which inserts your dictionary at a specific position.
Yet another way is to append the values wildly and after you are done, call sort on the array.
Improvement Tips
Notice that for the values I did not use strings, as you only have numbers like "id" : 30.
Also, if you want the second key to be called remaining_balance you should call the first key selling_price instead of sellingPrice. Because of conistency.
Alternative approach
As far as I have understood you are trying to implement some software that is responsibly for selling some products.
I think you are tackling this problem from a completely wrong side.
I think you should read about database relationships. Selling products actually is a very common problem.
Maybe this will help you. I would offer a possible solution myself, but I think this misses the point of your question.
If you decide to use the database approach, you won't necessarily have to use a database. You can take the approach and implement it using simple structs/classes/arrays.
I noticed this question lacks an extension answer, yes.. I'm gonna be that guy, so here it is. This could be made more generic by supporting other types of dictionaries, feel free to pitch in ;)
Inspiration from #eason's answer.
var newKV = [["remaining_balance": "420"],["remaining_balance": "490"],["remaining_balance": "500"]]
var array = [["id":"3", "sellingPrice":"520", "quantity":"15"], ["id":"5", "sellingPrice":"520", "quantity":"15"], ["id":"8", "sellingPrice":"520", "quantity":"15"]]
extension Array where Element == [String: String] {
enum UniquingKeysStrategy {
case old
case new
}
mutating func merge(with target: Array<Element>, uniquingKeysWith: UniquingKeysStrategy = .new) {
self = self.merged(with: target)
}
func merged(with target: Array<Element>, uniquingKeysWith strategy: UniquingKeysStrategy = .new) -> Array<Element> {
let base = self.count > target.count ? self : target
let data = self.count > target.count ? target : self
return data.enumerated().reduce(into: base, {
result, data in
result[data.offset]
.merge(data.element, uniquingKeysWith: {
old, new in
if strategy == .new { return new }
return old
})
})
}
}
let mergedArrays = newKV.merged(with: array, uniquingKeysWith: .old)
array.merge(with: newKV)
Happy Coding :)
I have NSDictionary, now I am trying to add an object in a particular key.How can I do that ? below is my code.
let businessPhoneDic = ["locationname" : "",
"area" : "",
"number" : "",
"type" : "",
];
let emailDic:NSMutableDictionary? = ["email" : "",];
let businessPhoneDic2 = ["locationname" : "hello",
"area" : "",
"phonenumber" : "",
"type" : "",
];
var mainDictionary = ["businessPhone" : businessPhoneDic as AnyObject,"email" : emailDic as AnyObject,
];
Now I want to add "businessPhoneDic2" into mainDictionary for key "businessPhone".How can I do that into Swift 3
By definition, you can't have two values mapped to the same key. The following code will replace the old key:
Swift 3
mainDictionary["businessPhone"] = businessPhoneDic2
Just use a new key if you need both values in your dictionary, or maybe store an array of dictionaries as values as such:
var mainDictionary : [String : [NSDictionary]] = ["businessPhone" : [businessPhoneDic]]
Then:
mainDictionary["businessPhone"]?.append(businessPhoneDic2)
First of all do not use MSMutable... collection types in Swift.
Use native Swift Dictionary
let emailDic = ["email" : ""]
Second of all annotate a dictionary with different types as [String:Any]
var mainDictionary : [String:Any] = ["businessPhone" : businessPhoneDic, "email" : emailDic]
If the value for key businessPhone is an array you can append the value. If it's a single dictionary you have to create an array.
This code considers both cases:
let businessPhone = mainDictionary["businessPhone"]
if var phone = businessPhone as? [[String:Any]] {
phone.append(businessPhoneDic2)
mainDictionary["businessPhone"] = phone
} else if let phone = businessPhone as? [String:Any] {
mainDictionary["businessPhone"] = [phone, businessPhoneDic2]
}
Try this :
mainDictionary["your key"] = businessPhoneDic2 as AnyObject // cast as per suggestions
Swift 3.x
// Initialize the Dictionary
var dict = ["name": "Foo", "surname": "Bar"]
// Add a new key with a value
dict["email"] = "foo.bar#email.com"
print(dict)
I'm working with this kind of array.
var myArray : [[String:String]] = [["1" : "Arun", "2" : "Gupta"],["1" : "John", "2" : "Cena"],["1" : "James" , "2" : "Bond"],["1" : "Iron", "2" : "Man"],["1" : "Karthik","2" : "Keyan"]]
I could assign values directly to this array and access the values through object. For example,
To access values in index zero.
let obj = myArray[0]
print(obj["1"],obj["2"])
it prints values in myArray[0]
Output:
Arun Gupta.
Now what i want is, how to append values to this kind of array instead of directly assigning values in the declaration itself.
Try this :
var array1 = ["1" : "Arun", "2" : "Gupta"]
myArray.append(array1)
Try append()
var myArray = [[String:String]]()
myArray.append(["1" : "Arun", "2" : "Gupta"])
print(myArray)
I have a array of dictionary like this.
let arr = [["EmpName" : "Alex", "Designation" : "Jr. Developer"],
["EmpName" : "Bob", "Designation" : "Sr. Developer"],
["EmpName" : "Claire", "Designation" : "Jr. Developer"],
["EmpName" : "David", "Designation" : "Project Manager"]]
Now I want to fetch only the EmpName objects from this. How do I do this in swift? I basically want an array which have the following values.
["Alex", "Bob", "Claire", "David"]
This is what I do now. But I wonder if I could do that in a single like by using filter or map...
var employees = [String]()
for empRecord in arr {
employees.append(empRecord["EmpName"]!)
}
A simple way is to use flatMap:
let employees = arr.flatMap { $0["EmpName"] }
Result:
["Alex", "Bob", "Claire", "David"]
flatMap in Swift is like map but it also safely unwraps optionals, which is what we need here since Swift dictionaries always return Optionals.
Here's two ways to do it. If you're cool with using NSArray I'm a fan of that solution.
let arr = [["EmpName" : "Alex", "Designation" : "Jr. Developer"],
["EmpName" : "Bob", "Designation" : "Sr. Developer"],
["EmpName" : "Claire", "Designation" : "Jr. Developer"],
["EmpName" : "David", "Designation" : "Project Manager"]]
let names = arr.map { (dictionary) -> String? in
return dictionary["EmpName"]
}
// names now contains array of names as String?
// If you want to use NSArray
let newArray = arr as NSArray
let newNames = newArray.valueForKeyPath("EmpName")
// newNames now contains array of names as String
I'm having trouble creating a specific structure in JSON with Swift. I use Swifty JSON for parsing but I can't figure out how to create one.
I have this array which is filled by Id's and quantity Ints of products in a shopping basket . I need to get the array into my JSON but I don't know how.
If you could help me with this I would be very glad :)
var productArray = Array<(id: Int,quantity: Int)>()
let jsonObject: [String: AnyObject] = [
"order": 1,
"client" : 1,
"plats": [
for product in productArray
{
"id": product.id
"quantity": product.quantity
}
]
]
You can't just start looping through stuff while defining your dictionary. Here's another approach.
First, create your array:
var productArray = Array<(id: Int,quantity: Int)>()
Add some products (for testing):
productArray += [(123, 1000)]
productArray += [(456, 50)]
Map this array into a new array of dictionaries:
let productDictArray = productArray.map { (product) -> [String : Int] in
[
"id": product.id,
"quantity": product.quantity
]
}
Use the new mapped array in your JSON object:
let jsonObject: [String: AnyObject] = [
"order": 1,
"client" : 1,
"plats": productDictArray
]
You are not supposed to do any kind of looping/condition making block of codes while creating Array's or Dictionary. For that you need to execute that piece of code outside, create a variable and use it.
Do try this way.
var productArray = Array<(id: Int,quantity: Int)>()
var prods = [[String:Int]]()
for product in productArray
{
var eachDict = [String:Int]()
eachDict["id"] = product.id
eachDict["quantity"] = product.quantity
prods.append(eachDict)
}
let jsonObject: [String: AnyObject] = [
"order": 1,
"client" : 1,
"plats": prods
]