I have a small chat app here.
I can have 2 types of messages:
- text
- video
I am using polymorphism while decoding the JSON like so:
import Foundation
enum MessageType: Int, Decodable {
case text
case video
}
protocol Message: Decodable {
static var type: MessageType { get }
var id: String { get }
var user: User { get}
var timestamp: String { get }
}
struct TextMessage: Message {
static var type: MessageType = .text
var id: String
var user: User
var timestamp: String
let text: String
}
struct VideoMessage: Message {
static var type: MessageType = .video
var id: String
var user: User
var timestamp: String
let text: String
let link: String
let poster: String
}
enum MessageWrapper: Decodable {
enum CodingKeys: String, CodingKey {
case type
}
case text(TextMessage)
case video(VideoMessage)
var item: Message {
switch self {
case .text(let item): return item
case .video(let item): return item
}
}
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
let type = try values.decode(Int.self, forKey: .type)
switch type {
case MessageType.text.rawValue: self = .text(try TextMessage(from: decoder))
case MessageType.video.rawValue: self = .video(try VideoMessage(from: decoder))
default:
throw DecodingError.dataCorruptedError(forKey: .type,
in: values,
debugDescription: "Invalid type")
}
}
}
I am also using the MVVM approach like so:
struct ChatViewModel {
enum ViewModelType {
case loading
case text(TextMessageViewModel)
case video(VideoMessageViewModel)
case failure(ErrorViewModel)
}
enum State {
case initialized
case loading
case loaded([Message])
case failed(Error)
}
let state: State
let viewModels: [ViewModelType]
init(with state: State) {
self.state = state
switch state {
case .initialized:
viewModels = []
case .loading:
viewModels = [
.loading,
]
......
}
}
In order to be able to use a Diffing library like Differ, the ChatViewModel should conform to the Equatable protocol.
extension ChatViewModel: Equatable {
static func == (lhs: ChatViewModel, rhs: ChatViewModel) -> Bool {
return lhs.state == rhs.state
}
}
extension ChatViewModel.State: Equatable {
static func == (lhs: ChatViewModel.State, rhs: ChatViewModel.State) -> Bool {
switch (lhs, rhs) {
case (.initialized, .initialized): return true
case (.loading, .loading): return true
case let (.loaded(l), .loaded(r)): return l == r
case let (.failed(l), .failed(r)): return l.localizedDescription == r.localizedDescription
default: return false
}
}
}
The problem here is for the case let (.loaded(l), .loaded(r)): return l == r, Message, as a protocol, doesn't conform to Equatable.
Making it conform to Equatable like
protocol Message: Decodable, Equatable {
static var type: MessageType { get }
var id: String { get }
var user: User { get}
var timestamp: String { get }
}
produce an error Protocol 'Message' can only be used as a generic constraint because it has Self or associated type requirements for the MessageWrapper:
enum MessageWrapper: Decodable {
...
var item: Message { // Protocol 'Message' can only be used as a generic constraint because it has Self or associated type requirements
switch self {
case .text(let item): return item
case .video(let item): return item
}
}
...
}
Any idea or suggestion to have a clean way to solve this? I saw some post about Type Erasure but after some tests I am not sure that it is actually solving the problem.
You don't have to conform to Equatable in order to be able to use the == operator. You can just define an operator like that yourself, without conforming to Equatable.
For convenience's sake, I'll assume that TextMessage and VideoMessage already conforms to Equatable.
First, write a method that compares Messages:
func messageEqual(m1: Message, m2: Message) -> Bool {
if let textMessage1 = m1 as? TextMessage, let textMessage2 = m2 as? TextMessage {
return textMessage1 == textMessage2
}
if let videoMessage1 = m1 as? VideoMessage, let videoMessage2 = m2 as? VideoMessage {
return videoMessage1 == videoMessage2
}
return false
}
Then a the == operator for [Message]:
func ==(messages1: [Message], messages2: [Message]) -> Bool {
return messages1.count == messages2.count &&
zip(messages1, messages2).allSatisfy(messageEqual)
}
Now l == r should compile.
What I want to achieve is to wait for all service calls to complete. I know that it can be done with GCD, but I'm looking for more Object Oriented Approach. Here is what I've so far:
First services should notify delegate for their completion, so we will need a protocol for that:
protocol ParallelServiceDelegate: class {
func serviceDidCompleted()
}
Services are Alamofire requests and we are getting their response as:
enum ServiceResult {
case Success(NSDictionary)
case Failure(NSError)
}
My design is to add Facade (wrapper) over this methods. This is the abstract:
import ObjectMapper
protocol ParallelService: class {
associatedtype ItemType: Mappable
var item: ItemType? { get }
var error: NSError? { get }
var isCompleted: Bool { get }
weak var delegate: ParallelServiceDelegate? { get set }
// TODO: Pass params
func start()
func handleRequestCompletion(result: ServiceResult)
}
private var psiAssociationKey: UInt8 = 0
private var pseAssociationKey: UInt8 = 0
private var psdAssociationKey: UInt8 = 0
extension ParallelService {
var item: ItemType? {
return _item
}
var error: NSError? {
return _error
}
var isCompleted: Bool {
return item != nil || error != nil
}
weak var delegate: ParallelServiceDelegate? {
get {
let object = objc_getAssociatedObject(self, &psdAssociationKey)
let wrapper = object as? WeakWrapper<ItemType?>
return wrapper?.value as? ParallelServiceDelegate
}
set(newValue) {
objc_setAssociatedObject(self,
&psdAssociationKey,
WeakWrapper(value: newValue),
.OBJC_ASSOCIATION_RETAIN)
}
}
func handleRequestCompletion(result: ServiceResult) {
switch result {
case .Success(let json):
_item = map(json, object: ItemType.self)
case .Failure(let error):
_error = error
}
}
// Degfault is nothing
func start() {}
// MARK: - Private
private var _item: ItemType? {
get {
let object = objc_getAssociatedObject(self, &psiAssociationKey)
let wrapper = object as? WeakWrapper<ItemType?>
return wrapper?.value as? ItemType
}
set(newValue) {
objc_setAssociatedObject(self,
&psiAssociationKey,
WeakWrapper(value: newValue),
.OBJC_ASSOCIATION_RETAIN)
}
}
private var _error: NSError? {
get {
let object = objc_getAssociatedObject(self, &pseAssociationKey)
return object as? NSError
}
set(newValue) {
objc_setAssociatedObject(self,
&pseAssociationKey,
newValue,
.OBJC_ASSOCIATION_RETAIN)
}
}
}
And Specific Service Facade implementation:
class EmployeesParallelService: ParallelService {
typealias ItemType = Employee
func start() {
Service.emploeesList(callback: handleRequestCompletion)
}
}
class InformationParallelService: ParallelService {
typealias ItemType = Information
func start() {
Service.information(callback: handleRequestCompletion)
}
}
Service caller - Knows nothing about services it just starts all and waits for them to complete:
class ParallelServiceCaller {
private var services: [ParallelService] = []
// MARK: - Lifecycle
func addParallelService(service: ParallelService) {
service.delegate = self
self.services.append(service)
}
// MARK: - Public
func start() {
for service in services {
service.start()
}
}
}
extension ParallelServiceCaller: ParallelServiceDelegate {
func serviceDidCompleted() {
for service in services {
// !!! wait
if !service.isCompleted {
return
}
}
// TODO: Notify delegate
}
}
Latter I want to use it like this:
let caller = ParallelServiceCaller()
caller.addParallelService(EmployeesParallelService())
caller.addParallelService(InformationParallelService())
caller.start()
However I got problem in the implementation of the ParallelServiceCaller class. I'm getting the following error:
Protocol 'ParallelService' can only be used as a generic constraint
because it has Self or associated type requirements
Any idea how to avoid this error?
Update 07/07/16:
I'm still not able to understand how to use PATs. However I took slightly different approach and now I'm using visitor pattern. Here is my playground code, it may be helpful for someone:
//: Playground - noun: a place where people can play
import UIKit
// Mocks
enum ServiceResult {
case Success(NSDictionary)
case Failure(NSError)
}
protocol Mappable { }
typealias CompletionHandlerType = (result: ServiceResult) -> Void
class Service {
class func emploeesList(start: Int? = nil,
max: Int? = nil,
timestamp: Int? = nil,
callback: CompletionHandlerType) {
callback(result: .Success(NSDictionary()))
}
class func information(timestamp: Int? = nil,
callback: CompletionHandlerType) {
callback(result: .Failure(NSError(domain: "", code: 1, userInfo: nil)))
}
}
class EmployeesList: Mappable {}
class Information: Mappable {}
// Actual Implementation
// Visitor
protocol ParallelServiceCallerProtocol {
func call(service: EmployeesListParallelService)
func call(service: InformationParallelService)
}
// Element
protocol ParallelServiceProtocol {
func start(visitor: ParallelServiceCallerProtocol)
}
// Concrete Elements
class EmployeesListParallelService: ParallelServiceProtocol {
func start(visitor: ParallelServiceCallerProtocol) { visitor.call(self) }
}
class InformationParallelService: ParallelServiceProtocol {
func start(visitor: ParallelServiceCallerProtocol) { visitor.call(self) }
}
// Concrete Visitor Delegate - defines callback for async tasks
protocol ParallelServiceCallerDelegateProtocol: class {
func didCompleteParellelServiceWithResult(service: ParallelServiceProtocol, result: ServiceResult)
}
// Concrete Visitor - make API calls
class ParallelServiceCaller <T: ParallelServiceCallerDelegateProtocol>: ParallelServiceCallerProtocol {
private unowned let delegate: T
init(delegate: T) {
self.delegate = delegate
}
func call(service: EmployeesListParallelService) {
Service.emploeesList { [unowned self] (result) in
self.delegate.didCompleteParellelServiceWithResult(service, result: result)
}
}
func call(service: InformationParallelService) {
Service.information { (result) in
self.delegate.didCompleteParellelServiceWithResult(service, result: result)
}
}
}
// Service Result In Context
enum SynchronizationServiceResult {
case Employees(ServiceResult)
case Information(ServiceResult)
}
// Concrete Visitor - Wraps API Result And Gives Context
class ParallelServiceParser: ParallelServiceCallerProtocol {
var result: SynchronizationServiceResult?
private let serviceResult: ServiceResult
init(serviceResult: ServiceResult) {
self.serviceResult = serviceResult
}
func call(service: EmployeesListParallelService) {
result = .Employees(serviceResult)
}
func call(service: InformationParallelService) {
result = .Information(serviceResult)
}
}
// Delegate that notifies for completion of all calls
protocol ParallelServiceManagerDelegateProtocol: class {
func didCompleteAllServicesWithResults(results: [SynchronizationServiceResult])
}
// Manager - starts all calls and adds context to returned results - knows nothing about calls
class ParallelServiceManager<T where T: ParallelServiceManagerDelegateProtocol> {
private let services: [ParallelServiceProtocol]
private unowned let delegate: T
// Keep Caller Visitors in Memory or they will be dealocated
private var callers: [ParallelServiceCaller<ParallelServiceManager>] = []
private var completed: [SynchronizationServiceResult] = [] {
didSet {
if completed.count == services.count {
self.delegate.didCompleteAllServicesWithResults(completed)
self.callers.removeAll()
}
}
}
init(services: [ParallelServiceProtocol], delegate: T) {
self.services = services
self.delegate = delegate
}
func start() {
visitAllServices { (service) in
let caller =
ParallelServiceCaller<ParallelServiceManager>(delegate: self)
service.start(caller)
self.callers.append(caller)
}
}
private func visitAllServices(perform: ParallelServiceProtocol -> () ) {
for service in self.services {
perform(service)
}
}
}
extension ParallelServiceManager: ParallelServiceCallerDelegateProtocol {
func didCompleteParellelServiceWithResult(service: ParallelServiceProtocol,
result: ServiceResult) {
// No need to persist parser visitor
let caller = ParallelServiceParser(serviceResult: result)
service.start(caller)
completed.append(caller.result!)
}
}
// Example Usage
class SynchronizationService {
private lazy var services: [ParallelServiceProtocol] = {
return [EmployeesListParallelService(), InformationParallelService()]
}()
func start() {
let manager = ParallelServiceManager<SynchronizationService>(services: services, delegate: self)
manager.start()
}
}
extension SynchronizationService: ParallelServiceManagerDelegateProtocol {
func didCompleteAllServicesWithResults(results: [SynchronizationServiceResult]) {
for result in results {
switch result {
case .Employees(let result):
// TODO:
print("\(result)") // Should Return Success
case .Information(let result):
// TODO:
print("\(result)") // Should Return Failure
}
}
}
}
let sync = SynchronizationService()
sync.start()
I am switching an application from Objective-C to Swift, which I have a couple of categories with stored properties, for example:
#interface UIView (MyCategory)
- (void)alignToView:(UIView *)view
alignment:(UIViewRelativeAlignment)alignment;
- (UIView *)clone;
#property (strong) PFObject *xo;
#property (nonatomic) BOOL isAnimating;
#end
As Swift extensions don't accept stored properties like these, I don't know how to maintain the same structure as the Objc code. Stored properties are really important for my app and I believe Apple must have created some solution for doing it in Swift.
As said by jou, what I was looking for was actually using associated objects, so I did (in another context):
import Foundation
import QuartzCore
import ObjectiveC
extension CALayer {
var shapeLayer: CAShapeLayer? {
get {
return objc_getAssociatedObject(self, "shapeLayer") as? CAShapeLayer
}
set(newValue) {
objc_setAssociatedObject(self, "shapeLayer", newValue, UInt(OBJC_ASSOCIATION_RETAIN))
}
}
var initialPath: CGPathRef! {
get {
return objc_getAssociatedObject(self, "initialPath") as CGPathRef
}
set {
objc_setAssociatedObject(self, "initialPath", newValue, UInt(OBJC_ASSOCIATION_RETAIN))
}
}
}
But I get an EXC_BAD_ACCESS when doing:
class UIBubble : UIView {
required init(coder aDecoder: NSCoder) {
...
self.layer.shapeLayer = CAShapeLayer()
...
}
}
Any ideas?
As in Objective-C, you can't add stored property to existing classes. If you're extending an Objective-C class (UIView is definitely one), you can still use Associated Objects to emulate stored properties:
for Swift 1
import ObjectiveC
private var xoAssociationKey: UInt8 = 0
extension UIView {
var xo: PFObject! {
get {
return objc_getAssociatedObject(self, &xoAssociationKey) as? PFObject
}
set(newValue) {
objc_setAssociatedObject(self, &xoAssociationKey, newValue, objc_AssociationPolicy(OBJC_ASSOCIATION_RETAIN))
}
}
}
The association key is a pointer that should be the unique for each association. For that, we create a private global variable and use it's memory address as the key with the & operator. See the Using Swift with Cocoa and Objective-C
on more details how pointers are handled in Swift.
UPDATED for Swift 2 and 3
import ObjectiveC
private var xoAssociationKey: UInt8 = 0
extension UIView {
var xo: PFObject! {
get {
return objc_getAssociatedObject(self, &xoAssociationKey) as? PFObject
}
set(newValue) {
objc_setAssociatedObject(self, &xoAssociationKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
}
}
}
UPDATED for Swift 4
In Swift 4, it's much more simple. The Holder struct will contain the private value that our computed property will expose to the world, giving the illusion of a stored property behaviour instead.
Source
extension UIViewController {
struct Holder {
static var _myComputedProperty:Bool = false
}
var myComputedProperty:Bool {
get {
return Holder._myComputedProperty
}
set(newValue) {
Holder._myComputedProperty = newValue
}
}
}
Associated objects API is a bit cumbersome to use. You can remove most of the boilerplate with a helper class.
public final class ObjectAssociation<T: AnyObject> {
private let policy: objc_AssociationPolicy
/// - Parameter policy: An association policy that will be used when linking objects.
public init(policy: objc_AssociationPolicy = .OBJC_ASSOCIATION_RETAIN_NONATOMIC) {
self.policy = policy
}
/// Accesses associated object.
/// - Parameter index: An object whose associated object is to be accessed.
public subscript(index: AnyObject) -> T? {
get { return objc_getAssociatedObject(index, Unmanaged.passUnretained(self).toOpaque()) as! T? }
set { objc_setAssociatedObject(index, Unmanaged.passUnretained(self).toOpaque(), newValue, policy) }
}
}
Provided that you can "add" a property to objective-c class in a more readable manner:
extension SomeType {
private static let association = ObjectAssociation<NSObject>()
var simulatedProperty: NSObject? {
get { return SomeType.association[self] }
set { SomeType.association[self] = newValue }
}
}
As for the solution:
extension CALayer {
private static let initialPathAssociation = ObjectAssociation<CGPath>()
private static let shapeLayerAssociation = ObjectAssociation<CAShapeLayer>()
var initialPath: CGPath! {
get { return CALayer.initialPathAssociation[self] }
set { CALayer.initialPathAssociation[self] = newValue }
}
var shapeLayer: CAShapeLayer? {
get { return CALayer.shapeLayerAssociation[self] }
set { CALayer.shapeLayerAssociation[self] = newValue }
}
}
So I think I found a method that works cleaner than the ones above because it doesn't require any global variables. I got it from here:
http://nshipster.com/swift-objc-runtime/
The gist is that you use a struct like so:
extension UIViewController {
private struct AssociatedKeys {
static var DescriptiveName = "nsh_DescriptiveName"
}
var descriptiveName: String? {
get {
return objc_getAssociatedObject(self, &AssociatedKeys.DescriptiveName) as? String
}
set {
if let newValue = newValue {
objc_setAssociatedObject(
self,
&AssociatedKeys.DescriptiveName,
newValue as NSString?,
UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC)
)
}
}
}
}
UPDATE for Swift 2
private struct AssociatedKeys {
static var displayed = "displayed"
}
//this lets us check to see if the item is supposed to be displayed or not
var displayed : Bool {
get {
guard let number = objc_getAssociatedObject(self, &AssociatedKeys.displayed) as? NSNumber else {
return true
}
return number.boolValue
}
set(value) {
objc_setAssociatedObject(self,&AssociatedKeys.displayed,NSNumber(bool: value),objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
The solution pointed out by jou doesn't support value types,
this works fine with them as well
Wrappers
import ObjectiveC
final class Lifted<T> {
let value: T
init(_ x: T) {
value = x
}
}
private func lift<T>(x: T) -> Lifted<T> {
return Lifted(x)
}
func setAssociatedObject<T>(object: AnyObject, value: T, associativeKey: UnsafePointer<Void>, policy: objc_AssociationPolicy) {
if let v: AnyObject = value as? AnyObject {
objc_setAssociatedObject(object, associativeKey, v, policy)
}
else {
objc_setAssociatedObject(object, associativeKey, lift(value), policy)
}
}
func getAssociatedObject<T>(object: AnyObject, associativeKey: UnsafePointer<Void>) -> T? {
if let v = objc_getAssociatedObject(object, associativeKey) as? T {
return v
}
else if let v = objc_getAssociatedObject(object, associativeKey) as? Lifted<T> {
return v.value
}
else {
return nil
}
}
A possible
Class extension (Example of usage):
extension UIView {
private struct AssociatedKey {
static var viewExtension = "viewExtension"
}
var referenceTransform: CGAffineTransform? {
get {
return getAssociatedObject(self, associativeKey: &AssociatedKey.viewExtension)
}
set {
if let value = newValue {
setAssociatedObject(self, value: value, associativeKey: &AssociatedKey.viewExtension, policy: objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
}
This is really such a great solution, I wanted to add another usage example that included structs and values that are not optionals. Also, the AssociatedKey values can be simplified.
struct Crate {
var name: String
}
class Box {
var name: String
init(name: String) {
self.name = name
}
}
extension UIViewController {
private struct AssociatedKey {
static var displayed: UInt8 = 0
static var box: UInt8 = 0
static var crate: UInt8 = 0
}
var displayed: Bool? {
get {
return getAssociatedObject(self, associativeKey: &AssociatedKey.displayed)
}
set {
if let value = newValue {
setAssociatedObject(self, value: value, associativeKey: &AssociatedKey.displayed, policy: objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
var box: Box {
get {
if let result:Box = getAssociatedObject(self, associativeKey: &AssociatedKey.box) {
return result
} else {
let result = Box(name: "")
self.box = result
return result
}
}
set {
setAssociatedObject(self, value: newValue, associativeKey: &AssociatedKey.box, policy: objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
var crate: Crate {
get {
if let result:Crate = getAssociatedObject(self, associativeKey: &AssociatedKey.crate) {
return result
} else {
let result = Crate(name: "")
self.crate = result
return result
}
}
set {
setAssociatedObject(self, value: newValue, associativeKey: &AssociatedKey.crate, policy: objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
You can't define categories (Swift extensions) with new storage; any additional properties must be computed rather than stored. The syntax works for Objective C because #property in a category essentially means "I'll provide the getter and setter". In Swift, you'll need to define these yourself to get a computed property; something like:
extension String {
public var Foo : String {
get
{
return "Foo"
}
set
{
// What do you want to do here?
}
}
}
Should work fine. Remember, you can't store new values in the setter, only work with the existing available class state.
My $0.02. This code is written in Swift 2.0
extension CALayer {
private struct AssociatedKeys {
static var shapeLayer:CAShapeLayer?
}
var shapeLayer: CAShapeLayer? {
get {
return objc_getAssociatedObject(self, &AssociatedKeys.shapeLayer) as? CAShapeLayer
}
set {
if let newValue = newValue {
objc_setAssociatedObject(self, &AssociatedKeys.shapeLayer, newValue as CAShapeLayer?, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
}
}
I have tried many solutions, and found this is the only way to actually extend a class with extra variable parameters.
Why relying on objc runtime? I don't get the point. By using something like the following you will achieve almost the identical behaviour of a stored property, by using only a pure Swift approach:
extension UIViewController {
private static var _myComputedProperty = [String:Bool]()
var myComputedProperty:Bool {
get {
let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
return UIViewController._myComputedProperty[tmpAddress] ?? false
}
set(newValue) {
let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
UIViewController._myComputedProperty[tmpAddress] = newValue
}
}
}
I prefer doing code in pure Swift and not rely on Objective-C heritage. Because of this I wrote pure Swift solution with two advantages and two disadvantages.
Advantages:
Pure Swift code
Works on classes and completions or more specifically on Any object
Disadvantages:
Code should call method willDeinit() to release objects linked to specific class instance to avoid memory leaks
You cannot make extension directly to UIView for this exact example because var frame is extension to UIView, not part of class.
EDIT:
import UIKit
var extensionPropertyStorage: [NSObject: [String: Any]] = [:]
var didSetFrame_ = "didSetFrame"
extension UILabel {
override public var frame: CGRect {
get {
return didSetFrame ?? CGRectNull
}
set {
didSetFrame = newValue
}
}
var didSetFrame: CGRect? {
get {
return extensionPropertyStorage[self]?[didSetFrame_] as? CGRect
}
set {
var selfDictionary = extensionPropertyStorage[self] ?? [String: Any]()
selfDictionary[didSetFrame_] = newValue
extensionPropertyStorage[self] = selfDictionary
}
}
func willDeinit() {
extensionPropertyStorage[self] = nil
}
}
With Obj-c Categories you can only add methods, not instance variables.
In you example you have used #property as a shortcut to adding getter and setter method declarations. You still need to implement those methods.
Similarly in Swift you can add use extensions to add instance methods, computed properties etc. but not stored properties.
Notice: after further analyzing, the code below works fine, but does not release the view object, so if I can find a way around it I'll edit the answer. meanwhile, read the comments.
How about storing static map to class that is extending like this :
extension UIView {
struct Holder {
static var _padding:[UIView:UIEdgeInsets] = [:]
}
var padding : UIEdgeInsets {
get{ return UIView.Holder._padding[self] ?? .zero}
set { UIView.Holder._padding[self] = newValue }
}
}
I also get an EXC_BAD_ACCESS problem.The value in objc_getAssociatedObject() and objc_setAssociatedObject() should be an Object. And the objc_AssociationPolicy should match the Object.
I tried using objc_setAssociatedObject as mentioned in a few of the answers here, but after failing with it a few times I stepped back and realized there is no reason I need that. Borrowing from a few of the ideas here, I came up with this code which simply stores an array of whatever my extra data is (MyClass in this example) indexed by the object I want to associate it with:
class MyClass {
var a = 1
init(a: Int)
{
self.a = a
}
}
extension UIView
{
static var extraData = [UIView: MyClass]()
var myClassData: MyClass? {
get {
return UIView.extraData[self]
}
set(value) {
UIView.extraData[self] = value
}
}
}
// Test Code: (Ran in a Swift Playground)
var view1 = UIView()
var view2 = UIView()
view1.myClassData = MyClass(a: 1)
view2.myClassData = MyClass(a: 2)
print(view1.myClassData?.a)
print(view2.myClassData?.a)
Here is simplified and more expressive solution. It works for both value and reference types. The approach of lifting is taken from #HepaKKes answer.
Association code:
import ObjectiveC
final class Lifted<T> {
let value: T
init(_ x: T) {
value = x
}
}
private func lift<T>(_ x: T) -> Lifted<T> {
return Lifted(x)
}
func associated<T>(to base: AnyObject,
key: UnsafePointer<UInt8>,
policy: objc_AssociationPolicy = .OBJC_ASSOCIATION_RETAIN,
initialiser: () -> T) -> T {
if let v = objc_getAssociatedObject(base, key) as? T {
return v
}
if let v = objc_getAssociatedObject(base, key) as? Lifted<T> {
return v.value
}
let lifted = Lifted(initialiser())
objc_setAssociatedObject(base, key, lifted, policy)
return lifted.value
}
func associate<T>(to base: AnyObject, key: UnsafePointer<UInt8>, value: T, policy: objc_AssociationPolicy = .OBJC_ASSOCIATION_RETAIN) {
if let v: AnyObject = value as AnyObject? {
objc_setAssociatedObject(base, key, v, policy)
}
else {
objc_setAssociatedObject(base, key, lift(value), policy)
}
}
Example of usage:
1) Create extension and associate properties to it. Let's use both value and reference type properties.
extension UIButton {
struct Keys {
static fileprivate var color: UInt8 = 0
static fileprivate var index: UInt8 = 0
}
var color: UIColor {
get {
return associated(to: self, key: &Keys.color) { .green }
}
set {
associate(to: self, key: &Keys.color, value: newValue)
}
}
var index: Int {
get {
return associated(to: self, key: &Keys.index) { -1 }
}
set {
associate(to: self, key: &Keys.index, value: newValue)
}
}
}
2) Now you can use just as regular properties:
let button = UIButton()
print(button.color) // UIExtendedSRGBColorSpace 0 1 0 1 == green
button.color = .black
print(button.color) // UIExtendedGrayColorSpace 0 1 == black
print(button.index) // -1
button.index = 3
print(button.index) // 3
More details:
Lifting is needed for wrapping value types.
Default associated object behavior is retain. If you want to learn more about associated objects, I'd recommend checking this article.
if you are looking to set a custom string attribute to a UIView, this is how I did it on Swift 4
Create a UIView extension
extension UIView {
func setStringValue(value: String, key: String) {
layer.setValue(value, forKey: key)
}
func stringValueFor(key: String) -> String? {
return layer.value(forKey: key) as? String
}
}
To use this extension
let key = "COLOR"
let redView = UIView()
// To set
redView.setStringAttribute(value: "Red", key: key)
// To read
print(redView.stringValueFor(key: key)) // Optional("Red")
In PURE SWIFT with WEAK reference handling
import Foundation
import UIKit
extension CustomView {
// can make private
static let storedProperties = WeakDictionary<UIView, Properties>()
struct Properties {
var url: String = ""
var status = false
var desc: String { "url: \(url), status: \(status)" }
}
var properties: Properties {
get {
return CustomView.storedProperties.get(forKey: self) ?? Properties()
}
set {
CustomView.storedProperties.set(forKey: self, object: newValue)
}
}
}
var view: CustomView? = CustomView()
print("1 print", view?.properties.desc ?? "nil")
view?.properties.url = "abc"
view?.properties.status = true
print("2 print", view?.properties.desc ?? "nil")
view = nil
WeakDictionary.swift
import Foundation
private class WeakHolder<T: AnyObject>: Hashable {
weak var object: T?
let hash: Int
init(object: T) {
self.object = object
hash = ObjectIdentifier(object).hashValue
}
func hash(into hasher: inout Hasher) {
hasher.combine(hash)
}
static func ==(lhs: WeakHolder, rhs: WeakHolder) -> Bool {
return lhs.hash == rhs.hash
}
}
class WeakDictionary<T1: AnyObject, T2> {
private var dictionary = [WeakHolder<T1>: T2]()
func set(forKey: T1, object: T2?) {
dictionary[WeakHolder(object: forKey)] = object
}
func get(forKey: T1) -> T2? {
let obj = dictionary[WeakHolder(object: forKey)]
return obj
}
func forEach(_ handler: ((key: T1, value: T2)) -> Void) {
dictionary.forEach {
if let object = $0.key.object, let value = dictionary[$0.key] {
handler((object, value))
}
}
}
func clean() {
var removeList = [WeakHolder<T1>]()
dictionary.forEach {
if $0.key.object == nil {
removeList.append($0.key)
}
}
removeList.forEach {
dictionary[$0] = nil
}
}
}
Another example with using Objective-C associated objects and computed properties for Swift 3 and Swift 4
import CoreLocation
extension CLLocation {
private struct AssociatedKeys {
static var originAddress = "originAddress"
static var destinationAddress = "destinationAddress"
}
var originAddress: String? {
get {
return objc_getAssociatedObject(self, &AssociatedKeys.originAddress) as? String
}
set {
if let newValue = newValue {
objc_setAssociatedObject(
self,
&AssociatedKeys.originAddress,
newValue as NSString?,
.OBJC_ASSOCIATION_RETAIN_NONATOMIC
)
}
}
}
var destinationAddress: String? {
get {
return objc_getAssociatedObject(self, &AssociatedKeys.destinationAddress) as? String
}
set {
if let newValue = newValue {
objc_setAssociatedObject(
self,
&AssociatedKeys.destinationAddress,
newValue as NSString?,
.OBJC_ASSOCIATION_RETAIN_NONATOMIC
)
}
}
}
}
First, Associated Objects should be the best right solution for the extended stored properties, because it comes from the Objective-C runtime, this is a great powerful feature that we should use before there are other native features of Swift language.
You should always aware that the associated objects will be released after there are no other objects to retain them, including swift objects, so don't use custom containers to retain the target values which won't be released automatically.
Second, for those additional associated key structure definitions, the core functions just need a UnsafeRawPointer for that, actually there is another best choice for that, #function is a static string which generated when compiling the source code, it also has its own address to use.
So, here is it:
var status: Bool? {
get { objc_getAssociatedObject(self, #function) as? Bool }
set { objc_setAssociatedObject(self, #function, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)}
}
Build for swift 5.
Last, keep in mind the object type with the association policy.
I tried to store properties by using objc_getAssociatedObject, objc_setAssociatedObject, without any luck. My goal was create extension for UITextField, to validate text input characters length.
Following code works fine for me. Hope this will help someone.
private var _min: Int?
private var _max: Int?
extension UITextField {
#IBInspectable var minLength: Int {
get {
return _min ?? 0
}
set {
_min = newValue
}
}
#IBInspectable var maxLength: Int {
get {
return _max ?? 1000
}
set {
_max = newValue
}
}
func validation() -> (valid: Bool, error: String) {
var valid: Bool = true
var error: String = ""
guard let text = self.text else { return (true, "") }
if text.characters.count < minLength {
valid = false
error = "Textfield should contain at least \(minLength) characters"
}
if text.characters.count > maxLength {
valid = false
error = "Textfield should not contain more then \(maxLength) characters"
}
if (text.characters.count < minLength) && (text.characters.count > maxLength) {
valid = false
error = "Textfield should contain at least \(minLength) characters\n"
error = "Textfield should not contain more then \(maxLength) characters"
}
return (valid, error)
}
}
Why not just do something like this, i see other solutions are way out of the small need.
private var optionalID: String {
UUID().uuidString
}
Here is an alternative that works also
public final class Storage : AnyObject {
var object:Any?
public init(_ object:Any) {
self.object = object
}
}
extension Date {
private static let associationMap = NSMapTable<NSString, AnyObject>()
private struct Keys {
static var Locale:NSString = "locale"
}
public var locale:Locale? {
get {
if let storage = Date.associationMap.object(forKey: Keys.Locale) {
return (storage as! Storage).object as? Locale
}
return nil
}
set {
if newValue != nil {
Date.associationMap.setObject(Storage(newValue), forKey: Keys.Locale)
}
}
}
}
var date = Date()
date.locale = Locale(identifier: "pt_BR")
print( date.locale )
I found this solution more practical
UPDATED for Swift 3
extension UIColor {
static let graySpace = UIColor.init(red: 50/255, green: 50/255, blue: 50/255, alpha: 1.0)
static let redBlood = UIColor.init(red: 102/255, green: 0/255, blue: 0/255, alpha: 1.0)
static let redOrange = UIColor.init(red: 204/255, green: 17/255, blue: 0/255, alpha: 1.0)
func alpha(value : CGFloat) -> UIColor {
var r = CGFloat(0), g = CGFloat(0), b = CGFloat(0), a = CGFloat(0)
self.getRed(&r, green: &g, blue: &b, alpha: &a)
return UIColor(red: r, green: g, blue: b, alpha: value)
}
}
...then in your code
class gameController: UIViewController {
#IBOutlet var game: gameClass!
override func viewDidLoad() {
self.view.backgroundColor = UIColor.graySpace
}
}