I am using Parse and have created a subclass of PFObject. When creating objects it makes things much easier. Once objects are created, I am experimenting with querying the database and accessing the custom properties I created. What I am finding is that I cannot use dot notation to access the properties when I am working the the PFObjects returned from the query. Is this normal?
Here is subclass I created.
import Foundation
import UIKit
import Parse
class MessagePFObject: PFObject
{
#NSManaged var messageSender : String
#NSManaged var messageReceiver : String
#NSManaged var messageMessage : String
#NSManaged var messageSeen : Bool
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Custom Query method.
override class func query() -> PFQuery?
{
let query = PFQuery(className: MessagePFObject.parseClassName())
query.includeKey("user")
query.orderByDescending("createdAt")
return query
}
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
init(messageSenderInput: String?, messageReceiverInput: String?, messageMessageInput: String?)
{
super.init()
self.messageSender = messageSenderInput!
self.messageReceiver = messageReceiverInput!
self.messageMessage = messageMessageInput!
self.messageSeen = false
}
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
override init()
{
super.init()
}
}
//++++++++++++++++++++++++++++++++++++ EXTENSION +++++++++++++++++++++++++++++++++++++++++++++++++++
extension MessagePFObject : PFSubclassing
{
class func parseClassName() -> String
{
return "MessagePFObject"
}
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
override class func initialize()
{
var onceToken: dispatch_once_t = 0
dispatch_once(&onceToken) {
self.registerSubclass()
}
}
}
Here is my query and what I am required to do to access the properties. createdAt, updatedAt, etc are all available with dot notation but none of my custom properties are. You can see I access messageSeen with element.objectForKey("messageSeen").
let predicate = NSPredicate(format: "messageSender == %# OR messageReceiver == %#", self.currentUser!.username!, self.currentUser!.username!)
let query = messagePFObject.queryWithPredicate(predicate)
query!.findObjectsInBackgroundWithBlock ({ (objects, error) -> Void in
if error == nil && objects!.count > 0
{
for element in objects!
{
print(element)
print(element.parseClassName)
print(element.objectId)
print(element.createdAt)
print(element.updatedAt)
print(element.objectForKey("messageSeen"))
}
}
else if error != nil
{
print(error)
}
})
If this is normal then that is fine. I just want to make sure I am not missing something.
Take care,
Jon
Your object subclass has to implement the PFSubclassing protocol and you need to call MessagePFObject.registerSubclass() in your app delegate.
The parse documentation is very good : https://parse.com/docs/ios/guide#objects-subclasses
I have a class which will perform a search. Once complete I want the search class to pass back the results to which ever instance (of another class) started the search. My thinking was to pass a reference to the class which instantiates the search class and use that reference to call a function. Here's a basic example of what I'm trying to do. How can I get this to work, or is there another/better way?
Search Class (I've tried AnyObject and UITableViewContoller):
class SearchClass : NSObject, NSURLConnectionDelegate, NSURLConnectionDataDelegate {
var callingClass : AnyObject? = nil //To store reference to the "other" class
var searchResults : [[String : AnyObject]]? = nil
init(callingClass: AnyObject) { //I don't know the name of the ViewController class which will instantiates this as it will be called by several different classes
self.callingClass = callingClass
}
func startSearch(searchString: String) {
//NSURLConnection etc
}
func connectionDidFinishLoading(connection: NSURLConnection) {
//more code
searchResults = ...
callingClass!.searchCompleted(searchResults) //Pass the search results back to the class instance which started the search
}
}
Other Classes:
class RandomViewController : UITableViewController {
//The casting on the next line fails
let Searcher = SearchClass(callingClass: self as! UITableViewController) //OR AnyObject
func randomFunction() {
searcher.startSearch("search query")
}
func searchComplete(searchResults: [[String : AnyObject]]) {
self.searchResults = searchResults
tableView.reloadData()
}
}
You can add a closure parameter to your startSearch function in your search class:
typealias SearchResultHandler = (result: [String : AnyObject]) -> ()
func startSearch(query: String, resultHandler: SearchResultHandler) {
// send the search request and in the completion handler of the request call your result handler:
resultHandler(result: searchResult)
}
Which you would then call from any class:
let searcher = SearchClass()
searcher.startSearch("query") { (result) -> () in
self.searchResults = results
tableView.reloadData()
}
You can use generics when you don't know what the class is going to be:
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Generics.html
However....
This seems like something that you should use protocol / delegates for.
// NOTE: weak references must be class type
protocol SearchClassDelegate: class {
func searchComplete(results: [[String: AnyObject]?])
}
// This is where you define T as the generic class
class SearchClass {
weak var delegate: SearchClassDelegate? // This is your "callingClass"
// NOTE: make sure it's weak
// ...
func connectionDidFinishLoading() {
// ...
self.delegate?.searchComplete(results)
}
}
// Set to the delegate
class ViewController: UIViewController, SearchClassDelegate {
// ...
// Make sure you set the delegate
// Here is where you implement this function
func searchComplete(results: [[String : AnyObject]?]) {
// Do whatever
// ...reloadData() etc.
}
}
So I have a protocol, and in it I want a variable that is a class type. That way I can init that class from the variable.
Keep in mind that there will be many different classes. I made a quick example.
I get the error "type 'CashRegister' does not conform to protocol 'RegisterProtocol'"
This example isn't exactly what I'm doing, but it gets the point across. Thanks for the help.
protocol RegisterProtocol {
var currentBill: DollarBillProtocol {get set}
func makeNewBill()->DollarBillProtocol
}
extension RegisterProtocol {
func printCurrentBill() {
Swift.print(currentBill)
}
}
class CashRegister: RegisterProtocol {
var currentBill = OneDollarBill.self
func makeNewBill() -> DollarBillProtocol {
return currentBill.init()
}
}
protocol DollarBillProtocol {
// protocol that all bills have in common
}
class OneDollarBill: DollarBillProtocol {
required init(){
}
}
class FiveDollarBill: DollarBillProtocol {
required init(){
}
}
The way you declare currentBill in CashRegister makes it a var of type class. But the protocol RegisterProtocol requires this variable to be of type DollarBillProtocol in any class that implements the protocol. The compile error is because of this mismatch.
To make this more clear, you could declare the var with the explicit type, as follows:
class CashRegister: RegisterProtocol {
var currentBill: DollarBillProtocol = OneDollarBill() // or other initial value
}
Currently I'm working on my new App written with Swift 2.0. Today I faced two strange errors in Xcode beta 5. I'd love if someone with a previous beta version of Xcode can confirm if I'm right or not. I also could misunderstand something, so I'll appreciate any feedback.
Here is some example code that made me struggle a while:
// Frist bug
protocol SomeProtocol {
var someArray: [String] { get set } // #1 bug
}
extension SomeProtocol {
func someFunction(someString: String) {
self.someArray.append(someString) // #1: Immutable value of type '[String]' only has mutating members named 'append'
}
}
// Second bug
protocol SomeInterfaceProtocol {
var someBool: Bool { get set } // #2 bug
}
class SomeClass: SomeInterfaceProtocol {
var someBool: Bool = false
func returnInterface() -> SomeInterfaceProtocol {
return self
}
}
let someInstance = SomeClass()
// can't set the value
someInstance.returnInterface().someBool = true // #2: Cannot assign to property: function call returns immutable value
The first error can be solved if you add the modifier mutating before the extension func declaration like this:
mutating func someFunction(someString: String) {
I suspect that's a change in the language.
The other one puzzles me as well. At least, here's a work-around:
var c = someInstance.returnInterface()
c.someBool = true
I think the second one isn't a bug as well for the same reason that you can't modify an item in a dictionary directly, or that you can't change elem in for elem in array { ... }.
Something has to be saved to be able to change it. Because you're returning the protocol type, the compiler can't know whether it's a struct or a class, whereas if it's a struct the operation of changing it would have no effect because it's not persisted in any way and structs aren't passed by reference. That's why Thomas' workaround works. Maybe it'll work too if returnInterface returned a class instance, instead of the protocol type.
EDIT: Just tried it out: Indeed it works either if you return SomeClass instead of SomeInterfaceProtocol or if you change the protocol to a class protocol, as it can't be a struct
protocol SomeInterfaceProtocol : class {
var someBool: Bool { get set }
}
class SomeClass: SomeInterfaceProtocol {
var someBool: Bool = false
func returnInterface() -> SomeInterfaceProtocol {
return self
}
}
or
protocol SomeInterfaceProtocol {
var someBool: Bool { get set }
}
class SomeClass: SomeInterfaceProtocol {
var someBool: Bool = false
func returnInterface() -> SomeClass {
return self
}
}
both work
How does one go about making a delegate, i.e. NSUserNotificationCenterDelegate in swift?
Here's a little help on delegates between two view controllers:
Step 1: Make a protocol in the UIViewController that you will be removing/will be sending the data.
protocol FooTwoViewControllerDelegate:class {
func myVCDidFinish(_ controller: FooTwoViewController, text: String)
}
Step2: Declare the delegate in the sending class (i.e. UIViewcontroller)
class FooTwoViewController: UIViewController {
weak var delegate: FooTwoViewControllerDelegate?
[snip...]
}
Step3: Use the delegate in a class method to send the data to the receiving method, which is any method that adopts the protocol.
#IBAction func saveColor(_ sender: UIBarButtonItem) {
delegate?.myVCDidFinish(self, text: colorLabel.text) //assuming the delegate is assigned otherwise error
}
Step 4: Adopt the protocol in the receiving class
class ViewController: UIViewController, FooTwoViewControllerDelegate {
Step 5: Implement the delegate method
func myVCDidFinish(_ controller: FooTwoViewController, text: String) {
colorLabel.text = "The Color is " + text
controller.navigationController.popViewController(animated: true)
}
Step 6: Set the delegate in the prepareForSegue:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "mySegue" {
let vc = segue.destination as! FooTwoViewController
vc.colorString = colorLabel.text
vc.delegate = self
}
}
And that should work. This is of course just code fragments, but should give you the idea. For a long explanation of this code you can go over to my blog entry here:
segues and delegates
If you are interested in what's going on under the hood with a delegate I did write on that here:
under the hood with delegates
Delegates always confused me until I realized that a delegate is just a class that does some work for another class. It's like having someone else there to do all the dirty work for you that you don't want to do yourself.
I wrote a little story to illustrate this. Read it in a Playground if you like.
Once upon a time...
// MARK: Background to the story
// A protocol is like a list of rules that need to be followed.
protocol OlderSiblingDelegate: class {
// The following command (ie, method) must be obeyed by any
// underling (ie, delegate) of the older sibling.
func getYourNiceOlderSiblingAGlassOfWater()
}
// MARK: Characters in the story
class BossyBigBrother {
// I can make whichever little sibling is around at
// the time be my delegate (ie, slave)
weak var delegate: OlderSiblingDelegate?
func tellSomebodyToGetMeSomeWater() {
// The delegate is optional because even though
// I'm thirsty, there might not be anyone nearby
// that I can boss around.
delegate?.getYourNiceOlderSiblingAGlassOfWater()
}
}
// Poor little sisters have to follow (or at least acknowledge)
// their older sibling's rules (ie, protocol)
class PoorLittleSister: OlderSiblingDelegate {
func getYourNiceOlderSiblingAGlassOfWater() {
// Little sis follows the letter of the law (ie, protocol),
// but no one said exactly how she had to respond.
print("Go get it yourself!")
}
}
// MARK: The Story
// Big bro is laying on the couch watching basketball on TV.
let bigBro = BossyBigBrother()
// He has a little sister named Sally.
let sally = PoorLittleSister()
// Sally walks into the room. How convenient! Now big bro
// has someone there to boss around.
bigBro.delegate = sally
// So he tells her to get him some water.
bigBro.tellSomebodyToGetMeSomeWater()
// Unfortunately no one lived happily ever after...
// The end.
In review, there are three key parts to making and using the delegate pattern.
the protocol that defines what the worker needs to do
the boss class that has a delegate variable, which it uses to tell the worker class what to do
the worker class that adopts the protocol and does what is required
Real life
In comparison to our Bossy Big Brother story above, delegates are often used for the following practical applications:
Communication: one class needs to send some information to another class.
Code example 1: sending data from one view controller to another
Code example 2: sending text input from a custom keyboard to a text field
Customization: one class wants to allow another class to customize it.
The great part is that these classes don't need to know anything about each other beforehand except that the delegate class conforms to the required protocol.
I highly recommend reading the following two articles. They helped me understand delegates even better than the documentation did.
What is Delegation? – A Swift Developer’s Guide
How Delegation Works – A Swift Developer’s Guide
One more note
Delegates that reference other classes that they do not own should use the weak keyword to avoid strong reference cycles. See this answer for more details.
It is not that different from obj-c.
First, you have to specify the protocol in your class declaration, like following:
class MyClass: NSUserNotificationCenterDelegate
The implementation will look like following:
// NSUserNotificationCenterDelegate implementation
func userNotificationCenter(center: NSUserNotificationCenter, didDeliverNotification notification: NSUserNotification) {
//implementation
}
func userNotificationCenter(center: NSUserNotificationCenter, didActivateNotification notification: NSUserNotification) {
//implementation
}
func userNotificationCenter(center: NSUserNotificationCenter, shouldPresentNotification notification: NSUserNotification) -> Bool {
//implementation
return true
}
Of course, you have to set the delegate. For example:
NSUserNotificationCenter.defaultUserNotificationCenter().delegate = self;
I got few corrections to post of #MakeAppPie
First at all when you are creating delegate protocol it should conform to Class protocol. Like in example below.
protocol ProtocolDelegate: class {
func myMethod(controller:ViewController, text:String)
}
Second, your delegate should be weak to avoid retain cycle.
class ViewController: UIViewController {
weak var delegate: ProtocolDelegate?
}
Last, you're safe because your protocol is an optional value. That means its "nil" message will be not send to this property. It's similar to conditional statement with respondToselector in objC but here you have everything in one line:
if ([self.delegate respondsToSelector:#selector(myMethod:text:)]) {
[self.delegate myMethod:self text:#"you Text"];
}
Above you have an obj-C example and below you have Swift example of how it looks.
delegate?.myMethod(self, text:"your Text")
Here's a gist I put together. I was wondering the same and this helped improve my understanding. Open this up in an Xcode Playground to see what's going on.
protocol YelpRequestDelegate {
func getYelpData() -> AnyObject
func processYelpData(data: NSData) -> NSData
}
class YelpAPI {
var delegate: YelpRequestDelegate?
func getData() {
println("data being retrieved...")
let data: AnyObject? = delegate?.getYelpData()
}
func processYelpData(data: NSData) {
println("data being processed...")
let data = delegate?.processYelpData(data)
}
}
class Controller: YelpRequestDelegate {
init() {
var yelpAPI = YelpAPI()
yelpAPI.delegate = self
yelpAPI.getData()
}
func getYelpData() -> AnyObject {
println("getYelpData called")
return NSData()
}
func processYelpData(data: NSData) -> NSData {
println("processYelpData called")
return NSData()
}
}
var controller = Controller()
DELEGATES IN SWIFT 2
I am explaining with example of Delegate with two viewControllers.In this case, SecondVC Object is sending data back to first View Controller.
Class with Protocol Declaration
protocol getDataDelegate {
func getDataFromAnotherVC(temp: String)
}
import UIKit
class SecondVC: UIViewController {
var delegateCustom : getDataDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func backToMainVC(sender: AnyObject) {
//calling method defined in first View Controller with Object
self.delegateCustom?.getDataFromAnotherVC(temp: "I am sending data from second controller to first view controller.Its my first delegate example. I am done with custom delegates.")
self.navigationController?.popViewControllerAnimated(true)
}
}
In First ViewController Protocol conforming is done here:
class ViewController: UIViewController, getDataDelegate
Protocol method definition in First View Controller(ViewController)
func getDataFromAnotherVC(temp : String)
{
// dataString from SecondVC
lblForData.text = dataString
}
During push the SecondVC from First View Controller (ViewController)
let objectPush = SecondVC()
objectPush.delegateCustom = self
self.navigationController.pushViewController(objectPush, animated: true)
First class:
protocol NetworkServiceDelegate: class {
func didCompleteRequest(result: String)
}
class NetworkService: NSObject {
weak var delegate: NetworkServiceDelegate?
func fetchDataFromURL(url : String) {
delegate?.didCompleteRequest(result: url)
}
}
Second class:
class ViewController: UIViewController, NetworkServiceDelegate {
let network = NetworkService()
override func viewDidLoad() {
super.viewDidLoad()
network.delegate = self
network.fetchDataFromURL(url: "Success!")
}
func didCompleteRequest(result: String) {
print(result)
}
}
Very easy step by step (100% working and tested)
step1: Create method on first view controller
func updateProcessStatus(isCompleted : Bool){
if isCompleted{
self.labelStatus.text = "Process is completed"
}else{
self.labelStatus.text = "Process is in progress"
}
}
step2: Set delegate while push to second view controller
#IBAction func buttonAction(_ sender: Any) {
let secondViewController = self.storyboard?.instantiateViewController(withIdentifier: "secondViewController") as! secondViewController
secondViewController.delegate = self
self.navigationController?.pushViewController(secondViewController, animated: true)
}
step3: set delegate like
class ViewController: UIViewController,ProcessStatusDelegate {
step4: Create protocol
protocol ProcessStatusDelegate:NSObjectProtocol{
func updateProcessStatus(isCompleted : Bool)
}
step5: take a variable
var delegate:ProcessStatusDelegate?
step6: While go back to previous view controller call delegate method so first view controller notify with data
#IBAction func buttonActionBack(_ sender: Any) {
delegate?.updateProcessStatus(isCompleted: true)
self.navigationController?.popViewController(animated: true)
}
#IBAction func buttonProgress(_ sender: Any) {
delegate?.updateProcessStatus(isCompleted: false)
self.navigationController?.popViewController(animated: true)
}
Simple Example:
protocol Work: class {
func doSomething()
}
class Manager {
weak var delegate: Work?
func passAlong() {
delegate?.doSomething()
}
}
class Employee: Work {
func doSomething() {
print("Working on it")
}
}
let manager = Manager()
let developer = Employee()
manager.delegate = developer
manager.passAlong() // PRINTS: Working on it
Delegates are a design pattern that allows one object to send messages to another object when a specific event happens.
Imagine an object A calls an object B to perform an action. Once the action is complete, object A should know that B has completed the task and take necessary action, this can be achieved with the help of delegates!
Here is a tutorial implementing delegates step by step in swift 3
Tutorial Link
Here is real life delegate scenario
Lets make our own UITextField and UITextFieldDelegate
// THE MYSTERIOUS UITEXTFIELD
protocol UITextFieldDelegate {
func textFieldDidChange(_ textField: UITextField) -> Void
}
class UITextField {
var delegate: UITextFieldDelegate?
private var mText: String?
var text: String? {
get {
return mText
}
}
init(text: String) {
}
init() {
}
func setText(_ text: String) {
mText = text
delegate?.textFieldDidChange(self)
}
}
// HERE IS MY APP
class Main {
let textfield = UITextField()
func viewDidLoad() {
print("viewDidLoad")
textfield.delegate = self
textfield.setText("Hello")
}
}
extension Main: UITextFieldDelegate {
func textFieldDidChange(_ textField: UITextField) {
print(textField.text ?? "No string")
}
}
let main = Main()
main.viewDidLoad()
Here Simple Code Example of Delegate:
//MARK: - Protocol ShowResult
protocol ShowResult: AnyObject {
func show(value: Int)
}
//MARK: - MyOperation Class
class MyOperation {
weak var delegate: ShowResult?
func sum(fNumber: Int, sNumber: Int) {
delegate?.show(value: fNumber + sNumber)
}
}
//MARK: - ViewController Class
class ViewController: UIViewController,ShowResult {
var myOperation: MyOperation?
override func viewDidLoad() {
super.viewDidLoad()
loadMyOperation()
myOperation?.delegate = self
myOperation?.sum(fNumber: 100, sNumber: 20)
}
private func loadMyOperation() {
if myOperation == nil {
myOperation = MyOperation()
}
}
func show(value: Int) {
print("value: \(value)")
}
}
The solutions above seemed a little coupled and at the same time avoid reuse the same protocol in other controllers, that's why I've come with the solution that is more strong typed using generic type-erasure.
#noreturn public func notImplemented(){
fatalError("not implemented yet")
}
public protocol DataChangedProtocol: class{
typealias DataType
func onChange(t:DataType)
}
class AbstractDataChangedWrapper<DataType> : DataChangedProtocol{
func onChange(t: DataType) {
notImplemented()
}
}
class AnyDataChangedWrapper<T: DataChangedProtocol> : AbstractDataChangedWrapper<T.DataType>{
var base: T
init(_ base: T ){
self.base = base
}
override func onChange(t: T.DataType) {
base.onChange(t)
}
}
class AnyDataChangedProtocol<DataType> : DataChangedProtocol{
var base: AbstractDataChangedWrapper<DataType>
init<S: DataChangedProtocol where S.DataType == DataType>(_ s: S){
self.base = AnyDataChangedWrapper(s)
}
func onChange(t: DataType) {
base.onChange(t)
}
}
class Source : DataChangedProtocol {
func onChange(data: String) {
print( "got new value \(data)" )
}
}
class Target {
var delegate: AnyDataChangedProtocol<String>?
func reportChange(data:String ){
delegate?.onChange(data)
}
}
var source = Source()
var target = Target()
target.delegate = AnyDataChangedProtocol(source)
target.reportChange("newValue")
output: got new value newValue
In swift 4.0
Create a delegate on class that need to send some data or provide some functionality to other classes
Like
protocol GetGameStatus {
var score: score { get }
func getPlayerDetails()
}
After that in the class that going to confirm to this delegate
class SnakesAndLadders: GetGameStatus {
func getPlayerDetails() {
}
}
In swift 5
I am a beginner, I think this is easiest way to understand in practical scenario
Note:Any improvisations are most appreciated
protocol APIService {
func onSuccessResponse() -> AnyObject
func onFailureResponse() -> AnyObject
}
class APIHelper{
var delegate : APIService?
func postUsersDataAPI() {
//assuming API communication is success
if(success){
let _: AnyObject? = delegate?.onSuccessResponse()
}else if(failure){
let _: AnyObject? = delegate?.onFailureResponse()
}
}
func getAllUsersAPI() {
//assuming API communication is success
if(success){
let _: AnyObject? = delegate?.onSuccessResponse()
}else if(failure){
let _: AnyObject? = delegate?.onFailureResponse()
}
}
}
class ViewController:UIViewController,APIService {
func onSuccessResponse() -> AnyObject {
print("onSuccessResponse") as AnyObject
}
func onFailureResponse() -> AnyObject {
print("onFailureResponse") as AnyObject
}
#IBAction func clickBtnToPostUserData(_ sender: Any) {
let apiHelper = APIHelper()
apiHelper.delegate = self
apiHelper.postAPI()
}