I have been attempting for a while now to add in an extra dictionary value into a NSMutableArray containing NSDictionaries at each index.
I have tried several approaches detailed below.
func findDistanceAndSortArray(offers : NSMutableArray){
for (index, offer) in enumerate(offers) {
var json = JSON(offer)
if let location = json["company"]["address"]["location"].dictionary {
//Not important Location code is here <-----
var distance = self.calculateDistance(newLat, longitude: newLngg)
var newDistance = ["totalDistance" : distance]
// I have tried these ....
// offers.insertObject(newDistance, atIndex: index)
// offer[newDistance]
// json["totalDistance"] = "" <-- this inserts the dictionary but I cannot add a string into ANYOBJECT
}
println("MORE inside \(json)")
println("MORE inside \(offers)")
}
}
The closest I got was using json["totalDistance"] = "" which inserted the value alongside its key but when I tried to add in the string it produced a error saying can't add string to value type JSON (As I am using SwiftyJson for parsing)
Can't seem to figure this one out but I'm sure its simple.
Thirst: you must not change an array while iterating thru the same array. Because you tried to:
// I have tried these ....
// offers.insertObject(newDistance, atIndex: index)
And the solution should be:
json["totalDistance"].string = distance
Please try, I currently have no compiler to test it.
Related
I'm looking to filter an array of arrays by specific value of one of the keys located within each array. Each nested array is read in from Firestore.
As an object, each nested array would look like this:
struct Video {
var url: String
var submissionDate: Timestamp
var submittingUser: String
}
I'm reading it in like this:
videos = document.get("videos") as? [[String : Any]] ?? nil
So far so good, but when I filter it like this:
filteredVideos = videos.filter { $0[2].contains(self.userIdentification) }
I can't do it without getting the error "Reference to member 'contains' cannot be resolved without a contextual type," an error which I was unable to find any relevant information on SO about.
I have read that some people say "Don't use arrays in Firestore!" but this is a build requirement.
Anyone have any ideas? Basically just need all arrays within the array where userId == submittingUser.
Reference Article:
I tried the answer from here: How to filter out a Array of Array's but no luck for this situation.
It's actually an array of dictionaries, not an array of arrays. All you need to do is construct the right predicate for the filter.
This is basically what your Firestore data looks like:
let videos: [[String: Any]] = [
["url": "http://www...", "submittingUser": "user1"],
["url": "http://www...", "submittingUser": "user2"]
]
This is the user you're looking for:
let userIdentification = "user2"
This is the predicate for the filer:
let filteredVideos = videos.filter { (video) -> Bool in
if let submittingUser = video["submittingUser"] as? String,
submittingUser == userIdentification {
return true
} else {
return false
}
}
You can shorthand this down to a single line if you're okay with force-unwrapping the dictionary (if you're 100% certain every video will have a valid submittingUser value):
let filteredVideos = videos.filter({ $0["submittingUser"] as! String == userIdentification })
Ok, I am working in an iMessage app and am trying to parse more than 1 url query item from the selected message here- I have been successful getting/sending just 1 value in a query:
override func willBecomeActive(with conversation: MSConversation) {
// Called when the extension is about to move from the inactive to active state.
// This will happen when the extension is about to present UI.
if(conversation.selectedMessage?.url != nil) //trying to catch error
{
let components = URLComponents(string: (conversation.selectedMessage?.url?.query?.description)!)
//let val = conversation.selectedMessage?.url?.query?.description
if let queryItems = components?.queryItems {
// process the query items here...
let param1 = queryItems.filter({$0.name == "theirScore"}).first
print("***************=> GOT IT ",param1?.value)
}
}
When I just have 1 value, just by printing conversation.selectedMessage?.url?.query?.description I get an optional with that 1 value, which is good. But with multiple I cant find a clean way to get specific values by key.
What is the correct way to parse a URLQueryItem for given keys for iMessage?
When you do conversation.selectedMessage?.url?.query?.description it simply prints out the contents of the query. If you have multiple items then it would appear something like:
item=Item1&part=Part1&story=Story1
You can parse that one manually by splitting the string on "&" and then splitting the contents of the resulting array on "=" to get the individual key value pairs in to a dictionary. Then, you can directly refer to each value by key to get the specific values, something like this:
var dic = [String:String]()
if let txt = url?.query {
let arr = txt.components(separatedBy:"&")
for item in arr {
let arr2 = item.components(separatedBy:"=")
let key = arr2[0]
let val = arr2[1]
dic[key] = val
}
}
print(dic)
The above gives you an easy way to access the values by key. However, that is a bit more verbose. The way you provided in your code, using a filter on the queryItems array, is the more compact solution :) So you already have the easier/compact solution, but if this approach makes better sense to you personally, you can always go this route ...
Also, if the issue is that you have to write the same filtering code multiple times to get a value from the queryItems array, then you can always have a helper method which takes two parameters, the queryItems array and a String parameter (the key) and returns an optional String value (the value matching the key) along the following lines:
func valueFrom(queryItems:[URLQueryItem], key:String) -> String? {
return queryItems.filter({$0.name == key}).first?.value
}
Then your above code would look like:
if let queryItems = components?.queryItems {
// process the query items here...
let param1 = valueFrom(queryItems:queryItems, key:"item")
print("***************=> GOT IT ", param1)
}
You can use iMessageDataKit library. It makes setting and getting data really easy and straightforward like:
let message: MSMessage = MSMessage()
message.md.set(value: 7, forKey: "user_id")
message.md.set(value: "john", forKey: "username")
message.md.set(values: ["joy", "smile"], forKey: "tags")
print(message.md.integer(forKey: "user_id")!)
print(message.md.string(forKey: "username")!)
print(message.md.values(forKey: "tags")!)
(Disclaimer: I'm the author of iMessageDataKit)
I am trying to search through a indexed dictionary to return a specific client based on the client's last name. Below are the data structures I am using. Each client object has a name property which is a String.
var clients = Client.loadAllClients() //Returns client array
var contacts = [String: [Client]]() //Indexed clients in a dictionary
var letters: [String] = []
var filteredClient = [Client]()
var shouldShowSearchResults = false
var searchController : UISearchController!
When I do my indexing, the contacts dictionary returns:
{A: [Client("Andrew")]}
Letters array returns:
[A]
I am using the UISearchController to display the filtered array of clients.
func updateSearchResults(for searchController: UISearchController) {
// how to filter the dictionary
self.tableView.reloadData()
}
However, I have no idea how to filter the dictionary to return the correct list of clients. I have tried to use
contacts.filter(isIncluded: ((key: String, value: [Client])) throws -> Bool((key: String, value: [Client])) throws -> Bool)
But I was very confused about the implementation. I am using Xcode 8.0 and Swift 3.0.
If anyone could point me in the right direction, that would be much appreciated. Please let me know if I need to clarify anything. Thank you in advance. The full code can be found at my Github
The main problem is that you are using a dictionary as data source array.
My suggestion is to use a custom struct as model
struct Contact {
let letter : String
var clients : [Client]
init(letter: String, clients : [Client] = [Client]()) {
self.letter = letter
self.clients = clients
}
mutating func add(client : Client) {
clients.append(client)
}
}
Then create your data source array
var contacts = [Contact]()
and the letter array as computed property
var letters : [String] = {
return contacts.map{ $0.letter }
}
It's easy to sort the array by letter
contacts.sort{ $0.letter < $1.letter }
Now you can search / filter this way (text is the text to be searched for)
filteredClient.removeAll()
for contact in contacts {
let filteredContent = contact.clients.filter {$0.name.range(of: text, options: [.anchored, .caseInsensitive, .diacriticInsensitive]) != nil }
if !filteredContent.isEmpty {
filteredClient.append(filteredContent)
}
}
You can even keep the sections (letters) if you declare filteredClient also as [Contact] and create temporary Contact instances with the filtered items.
Of course you need to change all table view data source / delegate methods to conform to the Contact array, but it's worth it. An array as data source is more efficient than a dictionary.
I'm saving lists in a dictionary. These lists need to be updated. But when searching for an item, I need [] operator. When I save the result to a variable, a copy is used. This can not be used, to change the list itself:
item = dicMyList[key]
if item != nil {
// add it to existing list
dicMyList[key]!.list.append(filename)
// item?.list.append(filename)
}
I know, that I need the uncommented code above, but this accesses and searches again in dictionary. How can I save the result, without searching again? (like the commented line)
I want to speed up the code.
In case you needn't verify whether the inner list was actually existing or not prior to adding element fileName, you could use a more compact solution making use of the nil coalescing operator.
// example setup
var dicMyList = [1: ["foo.sig", "bar.cc"]] // [Int: [String]] dict
var key = 1
var fileName = "baz.h"
// "append" (copy-in/copy-out) 'fileName' to inner array associated
// with 'key'; constructing a new key-value pair in case none exist
dicMyList[key] = (dicMyList[key] ?? []) + [fileName]
print(dicMyList) // [1: ["foo.sig", "bar.cc", "baz.h"]]
// same method used for non-existant key
key = 2
fileName = "bax.swift"
dicMyList[key] = (dicMyList[key] ?? []) + [fileName]
print(dicMyList) // [2: ["bax.swift"], 1: ["foo.sig", "bar.cc", "baz.h"]]
Dictionaries and arrays are value types. So if you change an entry you'll need to save it back into the dictionary.
if var list = dicMyList[key] {
list.append(filename)
dicMyList[key] = list
} else {
dicMyList[key] = [filename]
}
It's a little bit late, but you can do something like this:
extension Optional where Wrapped == Array<String> {
mutating func append(_ element: String) {
if self == nil {
self = [element]
}
else {
self!.append(element)
}
}
}
var dictionary = [String: [String]]()
dictionary["Hola"].append("Chau")
You can try this in the Playground and then adapt to your needs.
I have a stored NSMutableDictionary in NSUSerDefaluts and i have retrieve that successfully.
if var tempFeed: NSDictionary = NSUserDefaults.standardUserDefaults().dictionaryForKey("selectedFeeds") {
println("selected Feed: \(tempFeed)")
savedDictionary = tempFeed.mutableCopy() as NSMutableDictionary
The Question is How can i convert that MutableDictionary into an array/MuatableArray and iterate it so i can get the values of it.Here is the Dictionary. i want to get the values for all URL in that.
{
4 = {
URL = "myurl1";
};
5 = {
URL = "myurl3";
};
6 = {
URL = "myurl3";
};
}
I have tried number of options with failure.
Thank you.
If you want to add all the urls into an array, iterate over it and add append all values to some array.
for (_,urlDict) in savedDictionary {
for(_,url) in urlDict {
urlArr.append(url) // create empty urlArr before
}
}
urlArr now contains all the urls (not ordered)
You can use .values.array on your dictionary to get the values unordered.
as an array
Then, you can just add your NSArray to your NSMutableArray.
var mutableArray:NSMutableArray = NSMutableArray(array: savedDictionary .values.array)
If all you want to do is iterate over it, you don’t have to convert it to an array. You can do that directly:
for (key,value) in savedDictionary {
println("\(key) = \(value)")
}
(if you’re not interested in the key at all, you can replace that variable name with _ to ignore it).
Alternatively, instead of making tempFeed of type NSDictionary, just leave it as the type dictionaryForKey returns, which is a Swift dictionary. This has a .values property, which is a lazy sequence of all the values in the dictionary. You can convert that to an array (so tempFeed.values.array) or perform operations on it directly (use it in for…in, map it such as tempFeeds.values.map { NSURL(string: toString($0)) } etc.)