might sound like a basic question--but I'm not seeing where I am going wrong..
I end up with either of these two scenarios:
I keep getting the error "Could not cast value of type __NSCFNumber to NSSTring". if I use extractedSku = skuList[i]!.value["sku"] as! String
If I remove as! String it saves it, but it isn't saved as a string. How do I get this to be saved as a string?
I have appended data from firebase into an array
skuArray = [AnyObject?]()
in viewDidLoad, I am iterating skuArray to extract the 'sku' and store into a variable.
var skuArray = [AnyObject?]()
var productDetailArray = [AnyObject?]()
data stored in Sku Array is:
[Optional(Snap (aRandomKey) {
active = 1;
sku = 888888;
})]
viewDidLoad:
let skuList = self.skuArray
for var i = 0; i < skuList.count ; ++i{
let extractedSku = skuList[i]!.value["sku"] as! String
// go into database and extract "products" details by sku
self.databaseRef.child("products/\(extractedSku)").observeEventType(.ChildAdded, withBlock: { (snapshot:FIRDataSnapshot) in
self.productDetailArray.append(snapshot)
})
Since the underlying type is NSNumber, use the stringValue property to get a String:
if let extractedSku = (skuList[i]?.value["sku"] as? NSNumber)?.stringValue {
// use extractedSku which is of type String
}
Related
I have an array of custom objects but when I add items to array it creates duplicate of last item add in array.
Below is my code, please suggest where is the mistake, this small thing not able to get it.
var tempArr:[AnimalViewModel] = [AnimalViewModel]()
do {
var objAnimal = Animal()
var result = try managedContext.fetch(fetchRequest)
for ds in result as! [NSManagedObject] {
objAnimal.name = (ds.value(forKey: "name")) as! String
objAnimal.type = (ds.value(forKey: “type”)) as! String
Var objAVM = AnimalViewModel(aniModel: objAnimal)
tempArr.append(objAVM)
}
} catch {
print(" Error ")
}
The array tempArr contains all duplicate element as last inserted element even objAnimal contains different values.
Thanks,
First of all never print a meaningless literal string like "Error" in a catch block. Print always the error instance.
Animal is obviously a class (reference type). You are creating one instance and the properties are updated in the loop. As always the same instance is used the values are overwritten and you get result.count items with the same contents.
Create new instances inside the loop and replace Entity with the real entity name
var tempArr = [AnimalViewModel]()
do {
let result = try managedContext.fetch(fetchRequest) as! [Entity] // let !
for ds in result {
let objAnimal = Animal() // let !
objAnimal.name = ds.name
objAnimal.type = ds.type
let objAVM = AnimalViewModel(aniModel: objAnimal) // let !
tempArr.append(objAVM)
}
} catch {
print(error)
}
And please notice and fix the warnings about never mutated variables
I just want to create a dictionary with the help of for loop
sample code :
var counter: Int = 1;
var pageCountDict = [String:Any]();
for filterCount in counter..<6
{
if let count = "page_\(filterCount)_vtime" as? String
{
pageCountDict = [count: timeInterval_Int];
}
}
print(pageCountDict);
This print command give me only last value of forloop
I just want all the value of this variable pageCountDict in a dictonary
The way to assign to a dictionary is first use the subscript and assign the value to it:
pageCountDict[YourKey] = YourValue
Also, you can see many examples and explanations in Apple documentation regarding dictionaries.
With each loop, you are replacing the dictionary with one that contains only one element. What you want to do is this :
pageCountDict[count] = timeInterval_Int
Also, you shouldn't need the as? String part. This should be sufficient :
for filterCount in counter..<6
{
pageCountDict[count] = "page_\(filterCount)_vtime"
}
var pageCountDict = [String:Any]()
You can add values to this dictionary by merging previous contents and new data as follows...
let counter: Int = 1
var pageCountDict = [String:Any]()
for filterCount in counter..<6
{
let value = 9
let count = "page_\(filterCount)_vtime" //'if' is not needed as it is always true
pageCountDict.merge([count: timeInterval_Int], uniquingKeysWith:{ (key, value) -> Any in
//assign value for similar key
timeInterval_Int
})
}
print(pageCountDict)`
I want to create a dictionary with key as date & array of events.A date can have multiple events so i want to map one date as key of dictionary to the array of string.I will be dynamic a date can have no events or a date can have multiple events.I am getting data from array of dates i need to map it with events.
I have tried below code:
func addEventToDictionary(eventModal:CalenderEventModal,date:Date) {
var key:String = self.dateFormatter().string(from: date)
if let val = dict_events[key] {
} else {
dict_events[key] = [Any]()
}
dict_events[key] = eventModal
}
Here Event modal is an Object of Event.
Assuming dict_events is a dictionary with a declared type of [String: [Any]], then I believe all you're missing is appending to this array instead of assigning it. The value portion of the dictionary is Optional, so you need to append the value to a non-Optional array, then assign this back into your dictionary's key. Also, if you know you're only going to be storing CalenderEventModal objects, you could change the type of dict_events to [String: [CalenderEventModal]]. The fix for your code would look like this:
var dict_events: [String: [CalenderEventModal]] = [:]
func addEventToDictionary(eventModal: CalenderEventModal, date: Date) {
var key: String = self.dateFormatter().string(from: date)
if var val = dict_events[key] {
val.append(eventModal)
dict_events[key] = val
} else {
let events = [CalenderEventModal]()
events.append(eventModal)
dict_events[key] = events
}
}
I'm new in swift and I'd know how to do that in php, but I'm lost with all those dictionaries and I have no idea how to do that in swift 2. I've been googling for a while and didn't found what I need.
I'm parsing a jSon and storing it's values in an NSMutableDictionary in a loop and at the end of the loop I store the NSMutableDictionary in an NSMutableArray, so at the end I have an NSMutableArray with 43 elements, and each element have about 10 keys with their values. I need to sort those 43 elements from their "distance" key and sort them descending. I don't know if that is posible with this current approach. The value of the key "distance" is an int number (meters). I don't know if to use an NSMutableDictionary inside an NSMutable Array is the correct approach to do this but I'm using it because it is possible to have string keys, and not numbers indexes, so for me it's easier to access the key "distance" than the index 8...
First I load the jSon content:
private func parseJson(json : NSMutableArray, tableView : UITableView){
var c : Int = 0
for j in json {
var jsonValues = NSMutableDictionary()
//Create main value
guard let value = j.valueForKey("value")?.valueForKey("value")! else{
continue
}
//Get name
guard let Name : String = (value.valueForKey("Name")?.valueForKey("en") as? String) else {
continue
}
jsonValues["name"] = Name
//more code like this....
TableData.append(Name)
nsDict.insertObject(jsonValues, atIndex: c)
c += 1
}
this is my NSMutableArray content after being loaded:
And this is the code I have this far. Im trying to load the sorted content in a new array, but in this new array some keys are missing.
//Reorder Array by shop distance from user...
var sortDescriptor:NSSortDescriptor = NSSortDescriptor(key: "distance", ascending: true)
var sortedArray : NSArray = nsDict.sortedArrayUsingDescriptors([sortDescriptor])//Crashes
print(sortedArray)
I've managed to sort the array with this technique:
created a new class with for my array
import Foundation
class JsonArrayValues {
init(){
}
var name = String()
var distance = Float()
var lat = Float()
var lng = Float()
var openingTime = String()
var country = String()
var code = String()
var address = String()
var categories = String()
var city = String()
var type = String()
var brands = String()
}
I instantiated one before the loop:
var jsonArrData : [JsonArrayValues] = []
And another one inside the loop, in which I've added the values:
var c : Int = 0
for j in json {
var jsonValues : JsonArrayValues = JsonArrayValues()
//Get name
guard let Name : String = (value.valueForKey("Name")?.valueForKey("en") as? String) else {
continue
}
jsonValues.name = Name
//more code...
jsonArrData.append(jsonValues)
c += 1
}
And finally I've been able to call the function to reorder the array:
//Reorder Array by shop distance from user...
jsonArrData.sortInPlace({$0.distance < $1.distance})
One of your first steps in any non-trivial project really should be to spend some time looking around on github for tools that simplify your problem. In this case, you'd find there are so very many tools to simplify working with JSON in Swift. I'd suggest you look at EVReflection and Gloss particularly, although there are also many people who use SwiftyJSON.
You don't mention how you're accessing the network; you could look at AFNetworking or Alamofire. The latter also has AlamofireJsonToObjects to help.
I also found JSONExport to be incredibly useful.
You'd be spending a lot less time futzing with details as in this unfortunate question and more getting on with your larger goal.
{
ac = 0;
storeLocation = "<null>";
storeSizeSqFt = 1000;
tinNumber = testdummy4y58;
wirelessInternet = 0;
}
for the above written response I have written code
func StoreInfo(notification : NSNotification){
if let result = notification.userInfo{
print(result)
if let particularStoreInfo = result["data"] as? NSDictionary{
print(particularStoreInfo)
if let temp = particularStoreInfo["store"] as? NSDictionary{
print(temp)
}
}
}
}
I have successfully traversed inside the dictionary but Now guide me how to save and access details inside Store Dictionary.
To access data from inside an NSDictionary, you can use this method, assuming temp in your question is the dictionary you want to retrieve information from.
temp.objectForKey("ac") // Key can be of type AnyObject
The above will retrieve the information saved under the key "ac".
To store data in an NSDictionary, you must use NSMutableDictionary instead, which contains the method setObject.
Example of saving information:
var value = "This is the string I will save in the dictionary"
var dictionary = NSMutableDictionary()
dictionary.setObject(value, forKey: "Name of the Key")
UPDATED: Changed setValue example to setObject. See #vadian's comment for details.