Iphone screenshot
https://i.stack.imgur.com/zQ06M.png
I'm trying to make it so that my textLabel and my detailTextLabel show two different things but for some reason they both say the same thing. There should be just one cell here with the top label displaying the number 2 and the bottom label displaying the ;slakdfj(random typing for now). Refer to the links above for screenshot.
here is the main vc:
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
import FirebaseStorage
class ListViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var tableViewProducts: UITableView!
var delegate: ListViewController?
var ref:DatabaseReference?
var databaseHandle: DatabaseHandle?
var postData = [productsList]()
override func viewDidLoad() {
super.viewDidLoad()
ref = Database.database().reference().child("0")
loadProducts()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return postData.count
}
func loadProducts() {
ref?.observe(DataEventType.value, with: { (snapshot) in
var newSweets = [productsList]()
for post in snapshot.children {
let postObject = productsList(snapshot: post as! DataSnapshot)
newSweets.append(postObject)
print(self.postData)
}
self.postData = newSweets
self.tableViewProducts.reloadData()
}) { (error:Error) in
print(error)
}
}
//This places the text on the ViewControllerTableViewCell
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let sweet = postData[indexPath.row]
cell.textLabel?.text = sweet.id
cell.detailTextLabel?.text = sweet.p_name
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "showDetails", sender: self)
}
}
here is the structure:
import Foundation
import UIKit
import FirebaseDatabase
struct productsList {
let id: String!
let p_name: String!
init(id: String, p_name: String) {
self.id = id
self.p_name = p_name
}
init (snapshot:DataSnapshot) {
id = snapshot.value as! String
p_name = snapshot.value as! String
}
}
Data Structure(is pretty basic for now):
[ {
"id" : "2",
"p_name" : ";slakdfj"
} ]
Here you set the same value into id and p_name.
That's the reason.
init (snapshot:DataSnapshot) {
id = snapshot.value as! String
p_name = snapshot.value as! String
}
You need to change this code something like this:
init (snapshot:DataSnapshot) {
var dict = snapshot.value as! [String: AnyObject]
id = dict["id"] as! String
p_name = dict["p_name"] as! String
}
Here you need to change "id" and "p_name" to fit your firebase database.
Related
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var hero = [HeroStruct]()
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
navigationController?.navigationBar.barTintColor = UIColor.systemYellow
navigationController?.navigationBar.titleTextAttributes = [.foregroundColor: UIColor.systemYellow ]
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 100
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: UITableViewCell.CellStyle.subtitle, reuseIdentifier: nil)
cell.textLabel?.text = ""
cell.backgroundColor = .systemYellow
return cell
}
func getJsonData(completion: #escaping () -> () ) {
let url = URL(string: "https://api.opendota.com/api/heroStats")
let task = URLSession.shared.dataTask(with: url!) { data, response, error in
if error != nil {
print(error?.localizedDescription)
}else {
do {
let result = try JSONDecoder().decode(HeroStruct.Type, from: data!)
}catch {
print(error)
}
}
}
}
}
import Foundation
struct HeroStruct : Decodable {
let localized_name : String
let primary_attr : String
let attack_type : String
let legs : Int
let img : String
}
First code block is my ViewController.swift page,
second code block is my HeroStruct.swift page,
I tried to get data from Json but i got error like this:
Type 'HeroStruct.Type' cannot conform to 'Decodable'
How can i solve this?
let result = try JSONDecoder().decode([HeroStruct].Type, from: data!)`
I tried write like this but doesn't work. Need help ,thanks.
Replace [HeroStruct].Type with [HeroStruct].self. Whenever you want to decode something, always use .self & not .Type.
Guys i want to get all names from JSON (screenshot below) and put them to tableView. The problem is...i got dictionary with this code. Now, how i can get each name value and put them on tableView.
func getDataFromApi(){
Alamofire.request("https://api.coinmarketcap.com/v2/listings/").responseJSON{ response in
if let locationJSON = response.result.value{
let locationObject: Dictionary = locationJSON as! Dictionary<String, Any>
for (key, value) in locationObject {
print("id:\(key), value:\(value)")
}
}
}
}
I would suggest convert the dictionaries response to a Currency object:
class Currency: NSObject {
var id: Int!
var name: String!
var symbol: String!
var websiteSlug: String!
init(id: Int, name: String, symbol: String, websiteSlug: String) {
super.init()
self.id = id
self.name = name
self.symbol = symbol
self.websiteSlug = websiteSlug
}
}
Then under the variables' section define the currencies array:
var currencies = [Currency]()
Finaly change the getDataFromApi implementation to this:
func getDataFromApi() {
Alamofire.request("https://api.coinmarketcap.com/v2/listings/").responseJSON{ response in
if let locationJSON = response.result.value as? [String: Any] {
let data = locationJSON["data"] as! [[String: Any]]
for dataItem in data {
let currency = Currency(id: dataItem["id"] as! Int,
name: dataItem["name"] as! String,
symbol: dataItem["symbol"] as! String,
websiteSlug: dataItem["website_slug"] as! String)
self.currencies.append(currency)
}
print(self.currencies)
}
}
}
I always suggest model the responses to objects because it allows you to do a better managing of the data you need to display on screen and keep your code structure organised.
Now you can easily show the data in a UITableView object from the currencies array.
I would suggest convert the Array In dictionaries response un a Currency object:
var dataArray = NSArray()
#IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a
nib.
self.getDataFromApi()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func getDataFromApi(){
Alamofire.request("https://api.coinmarketcap.com/v2/listings/").responseJSON{ response in
if let locationJSON = response.result.value{
let locationObject: Dictionary = locationJSON as! Dictionary<String, Any>
self.dataArray = locationObject["data"]as! NSArray
self.tableView.reloadData()
// for (key, value) in locationObject {
// print("id:\(key), value:\(value)")
// }
}
}
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dataArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier:"cell") as! UITableViewCell
cell.textLabel?.text = (dataArray.object(at:indexPath.row) as! NSDictionary).value(forKey:"name") as! String
cell.detailTextLabel?.text = (dataArray.object(at:indexPath.row) as! NSDictionary).value(forKey:"symbol") as! String
return cell
}
var nameArray = [String]()
override func viewDidLoad() {
super.viewDidLoad()
getData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return nameArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! tableCell
cell.nameLabel.text = nameArray[indexPath.row]
return cell
}
func alamofire() {
Alamofire.request("https://api.coinmarketcap.com/v2/listings/", method: .get, parameters: nil, encoding: URLEncoding.default, headers: nil).responseJSON { (response:DataResponse<Any>) in
switch(response.result) {
case .success(_):
guard let json = response.result.value as! [String:Any] else{ return}
guard let data = ["data"] as! [[String: Any]] else { return}
for item in data {
if let name = item["name"] as? String {
self.nameArray.append(name)
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
break
case .failure(_):
print(response.result.error as Any)
break
}
}
}
Here i have created table view with labelName and labelUsername,
and i have downloaded Json data and saving it in core data entity called Details which contains attributes name and username..
here table view showing its data in online...
but how can i show fetched data in table view while in offline..
please help me in the code...
import UIKit
import CoreData
struct JsonData {
var nameS: String
var usernameS: String
init(name: String, username: String) {
self.nameS = name
self.usernameS = username
}
}
class ViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
var iteamsArray = [JsonData]()
override func viewDidLoad() {
downloadJson()
}
func downloadJson(){
let urlStr = "https://jsonplaceholder.typicode.com/users"
let url = URL(string: urlStr)
URLSession.shared.dataTask(with: url!, completionHandler: {(data, response, error) in
guard let respData = data else {
return
}
guard error == nil else {
print("error")
return
}
do{
let jsonObj = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [[String: Any]]
for items in jsonObj {
let nameJson = items["name"] as? String
let usernameJson = items["username"] as? String
let coreData = NSEntityDescription.insertNewObject(forEntityName: "Details", into: self.context) as! Details
coreData.name = nameJson
coreData.username = usernameJson
self.iteamsArray.append(JsonData(name: nameJson!, username: usernameJson!))
}
try self.context.save()
//fetching from core data
let fetchRequest : NSFetchRequest<Details> = Details.fetchRequest()
let details = try self.context.fetch(fetchRequest)
if details.count > 0 {
for detail in details as [NSManagedObject] {
let nameCore = detail.value(forKey: "name")
let usernameCore = detail.value(forKey: "username")
}
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
catch {
print("catch error")
}
}).resume()
}
}
// MARK: - TableView
extension ViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return iteamsArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "JsonCell", for: indexPath) as! JsonTableViewCell
let aData = iteamsArray[indexPath.row]
cell.labelName.text = aData.nameS
cell.labelUsername.text = aData.usernameS
cell.selectionStyle = .none
return cell
}
}
First of all forget the custom struct. Use the NSManagedObject class as data source array.
var iteamsArray = [Details]()
In viewDidLoad first fetch the data, if the array is empty load it from the web service
override func viewDidLoad() {
let fetchRequest : NSFetchRequest<Details> = Details.fetchRequest()
do {
iteamsArray = try self.context.fetch(fetchRequest)
if iteamsArray.isEmpty {
downloadJson()
} else {
self.tableView.reloadData()
}
} catch { print(error) }
}
In downloadJson() replace
self.iteamsArray.append(JsonData(name: nameJson!, username: usernameJson!))
with
self.iteamsArray.append(coreData)
and remove these lines
//fetching from core data
let fetchRequest : NSFetchRequest<Details> = Details.fetchRequest()
let details = try self.context.fetch(fetchRequest)
if details.count > 0 {
for detail in details as [NSManagedObject] {
let nameCore = detail.value(forKey: "name")
let usernameCore = detail.value(forKey: "username")
}
}
In cellForRow get the values directly from the NSManagedObject objects
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "JsonCell", for: indexPath) as! JsonTableViewCell
let aData = iteamsArray[indexPath.row]
cell.labelName.text = aData.name
cell.labelUsername.text = aData.userName
cell.selectionStyle = .none
return cell
}
I'm trying to save the data from func getCoinData to an array sympolsCoin and array sympolsCoin to use it in my TableView
I create this class in the same ViewController.swift file :
struct Coin: Decodable {
let symbol : String
let price_usd : String }
And this in my View controller class :
var coins = [Coin]()
var sympolsCoin = [String]()
var priceUSDcoin = [String]()
func getCoinData(completion: #escaping () -> ()) {
let jsonURL = "https://api.coinmarketcap.com/v1/ticker/"
let url = URL(string: jsonURL)
URLSession.shared.dataTask(with: url!) { (data, response, error) in
do {
self.coins = try JSONDecoder().decode([Coin].self, from: data!)
for info in self.coins {
self.sympolsCoin.append(info.symbol)
self.priceUSDcoin.append(info.price_usd)
print("\(self.sympolsCoin) : \(self.priceUSDcoin)")
completion()
}
}
catch {
print("Error is : \n\(error)")
}
}.resume()
}
And when i use the array in my TableView i got blank table !
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "BitcoinTableViewCell", for: indexPath) as! BitcoinTableViewCell
cell.coinNameLable.text = sympolsCoin[indexPath.row]
cell.priceLable.text = priceUSDcoin[indexPath.row]
return cell
}
Since you are using JSONDecoder the entire logic to create and populate sympolsCoin and priceUSDcoin is pointless and redundant.
struct Coin: Decodable {
private enum CodingKeys: String, CodingKey {
case symbol, priceUSD = "price_usd"
}
let symbol : String
let priceUSD : String
}
var coins = [Coin]()
The completion handler is redundant, too. Just reload the table view on the main thread after receiving the data:
func getCoinData() {
let jsonURL = "https://api.coinmarketcap.com/v1/ticker/"
let url = URL(string: jsonURL)
URLSession.shared.dataTask(with: url!) { [unowned self] (data, response, error) in
guard let data = data else { return }
do {
self.coins = try JSONDecoder().decode([Coin].self, from: data)
DispatchQueue.main.async {
self.tableView.reloadData()
}
} catch {
print("Error is : \n\(error)")
}
}.resume()
}
In viewDidLoad load the data
override func viewDidLoad() {
super.viewDidLoad()
getCoinData()
}
In cellForRow update the UI
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "BitcoinTableViewCell", for: indexPath) as! BitcoinTableViewCell
let coin = coins[indexPath.row]
cell.coinNameLable.text = coin.symbol
cell.priceLable.text = coin.priceUSD
return cell
}
Create an Outlet of tableView in ViewController Class and give it name "tableView" then
Try this code: Swift 4
func getCoinData() {
let jsonURL = "https://api.coinmarketcap.com/v1/ticker/"
let url = URL(string: jsonURL)
URLSession.shared.dataTask(with: url!) { (data, response, error) in
do {
self.coins = try JSONDecoder().decode([Coin].self, from: data!)
for info in self.coins {
self.sympolsCoin.append(info.symbol)
self.priceUSDcoin.append(info.price_usd)
print("\(self.sympolsCoin) : \(self.priceUSDcoin)")
self.tableView.reloadData()
}
}
catch {
print("Error is : \n\(error)")
}
}.resume()
}
Call this function in ViewDidLoad like this
override func viewDidLoad() {
super.viewDidLoad()
getCoinData()
}
You need to update the tableView from the main thread. As a good lesson to learn: Always update the UI from the Main Thread. Always.
do {
self.coins = try JSONDecoder().decode([Coin].self, from: data!)
for info in self.coins {
self.sympolsCoin.append(info.symbol)
self.priceUSDcoin.append(info.price_usd)
DispatchQueue.main.async {
self.tableView.reloadData()
}
print("\(self.sympolsCoin) : \(self.priceUSDcoin)")
completion()
}
}
There is, however another problem with your code the way you have your labels setup won't work. TableViewCells get reused so I'm guessing you have #IBOutlets for them somewhere else. What you should do is declare a label constant in cellForRowAt:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
let coinNameLabel = cell.viewWithTag(100) as! UILabel
coinNameLabel.text = sympolsCoin[indexPath.row]
let priceNameLabel = cell.viewWithTag(101) as! UILabel
priceNameLabel.text = priceUSDcoin[indexPath.row]
}
The above code assumes you've setup two labels with the tags 100 and 101 in your storyboard(assuming your using one)
**
// First View Controller
//
//
//
import UIKit
struct Countory : Decodable {
let name: String
let capital: String
let region: String
let alpha2Code: String
}
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var listArr = [Countory]()
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
let url = "https://restcountries.eu/rest/v2/all"
let urlObj = URL(string: url)!
URLSession.shared.dataTask(with: urlObj) {(data, responds, Error) in
do {
self.listArr = try JSONDecoder().decode([Countory].self, from: data!)
for country in self.listArr {
print("Country",country.name)
print("###################")
print("Capital",country.capital)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
} catch {
print(" not ")
}
}.resume()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.listArr.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell") as! TableViewCell
cell.label1.text = "Name: \(listArr[indexPath.row].name)"
cell.lable2.text = listArr[indexPath.row].capital
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let homeView = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
homeView.res = listArr[indexPath.row].region
homeView.alpha = listArr[indexPath.row].alpha2Code
self.navigationController?.pushViewController(homeView, animated: true)
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
}
// SecondViewController
class SecondViewController: UIViewController {
#IBOutlet weak var label4: UILabel!
#IBOutlet weak var label3: UILabel!
var res = ""
var alpha = ""
override func viewDidLoad() {
super.viewDidLoad()
self.label3.text = res
self.label4.text = alpha
}
}
**
I have a (large amount) of data that I want to send to Table View with alamofire and siftyJSON
web request :
let postEndPoint :String = "http://jsonplaceholder.typicode.com/posts/"
code Alamofire and SwiftyJSON:
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, postEndPoint).responseJSON { response in
// handle json
guard response.result.error == nil else{
print("error calling Get on /posts/1")
print(response.result.error)
return
}
if let value: AnyObject = response.result.value{
let post = JSON(value)
// for i in 0...post.count{
if let title = post["data"].arrayValue as? [JSON]{
self.datas = title
self.tableView.reloadData()
print("the title is :\(title)" )
}else{
print("eror parsing /post/1 ")
}
// }
}
}
}
code table view :
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell : UITableViewCell = tableView.dequeueReusableCellWithIdentifier("Cell")!
var dict = datas[indexPath.row]
cell.textLabel?.text = dict["userId"] as? String
cell.detailTextLabel?.text = dict["id"] as? String
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return datas.count
}
}
web request :enter link description here
I am trying to post some json data to table view but when I send the data it returns nothing . why??
this is the code working for me. main thing is you have to reload the table at the end of api calling. and you are printing nuber as a string so you have to convert it to string
my code is here
import UIKit
class customcell: UITableViewCell {
#IBOutlet weak var lbl1: UILabel!
#IBOutlet weak var lbl2: UILabel!
}
class ViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {
#IBOutlet weak var tabledata: UITableView!
let postEndPoint :String = "http://jsonplaceholder.typicode.com/posts/"
var arr:NSMutableArray = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
web()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("customcell") as! customcell
let dict = arr[indexPath.row] as! NSDictionary
print(dict)
print(dict["userId"])
cell.lbl1?.text = String (dict["userId"]! )
cell.lbl2?.text = String (dict["id"]! )
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arr.count
}
func web()
{
request(.GET, postEndPoint, parameters: nil, encoding:
.JSON).responseJSON { (response:Response<AnyObject, NSError>) -> Void in
print(response.result.value)
if (response.result.value != nil)
{
self.arr = (response.result.value) as! NSMutableArray
}
self.tabledata.reloadData()
}
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if (tableView == tabledata)
{
let cell = tableView.dequeueReusableCellWithIdentifier("customcell") as! customcell
let dict = arr[indexPath.row] as! NSDictionary
cell.lbl1?.text = String (dict["userId"]! )
cell.selectionStyle = .None
return cell
}
else if(tableView == tablefactoryoption)
{
let cell1:Facturyoptioncell = tableView.dequeueReusableCellWithIdentifier("Facturyoptioncell") as! Facturyoptioncell
let dict = arr[indexPath.row] as! NSDictionary
cell1.lbl2?.text = String (dict["Id"]! )
cell1.selectionStyle = .None
cell1.selectionStyle = .None
return cell1
}
else
{
let cell2:Technicalcell = tableView.dequeueReusableCellWithIdentifier("Technicalcell") as! Technicalcell
let dict = arr[indexPath.row] as! NSDictionary
cell2.lbl3?.text = String (dict["userId"]! )
return cell2
}
}
This is how you can use multiple tableview for display data.