The result I want is:
The generic type can be an array or a separate protocol,
The return value is also judged based on the generic type
This code is not compiled:
protocol HandyJSON {
}
extension HandyJSON {
static func deserialize(from dic: [String:Any]?) -> HandyJSON? {
//return HandyJSON?
}
}
extension Array where Element: HandyJSON {
static func deserialize(from arr: [Any]?) -> [Element?]? {
//return [HandyJSON?]
}
}
class Person : HandyJSON {
var name : String?
var age : Int?
}
struct Requests {
// T can be a protocal, and [object]
static func post<T>(decodeType:T.Type) where T : HandyJSON, T : [HandyJSON] -> T {
//send reques...
//let data = resp.data
var respData : Any?
// if let data = respData as? [String : Any] {
//
// }
//
// if let data = respData as? [Any] {
//
// }
//T is HandyJSON
if decodeType is HandyJSON.Type {
return T.deserialize(from: (respData as? [String : Any]))
//or? -> HandyJSON
//return decodeType.deserialize(from: NSDictionary?)
}
//T is [HandyJSON]
if decodeType is [HandyJSON].Type {
return T.deserialize(from: (respData as? [Any]))
//or?
//return decodeType.deserialize(from: [Any]?)
}
}
}
Error: Type 'T' constrained to non-protocol, non-class type '([HandyJSON]) -> T'
Whether generic can be defined as Array, Some object Array
If these methods are implemented, I can use it like this
class vc : UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let somebody : Person? = Requests.post(decodeType:Person.Type) // Person Object
let arr : [Person?]? = Requests.post(decodeType:[Person].Type)
}
}
Or describe like this
T can be a object or array that implement HandyJSON protocol
func post<T:HandyJSON | [HandyJSON]>(arg:T.Type) -> T {
//
}
Related
Take this case of a type constrained class Parameter, wrapping a value of given type.
Parameter conforms to the AnyParameter so it can be passed anywhere in the app without knowing the type. Parameters can be displayed in value cells AnyValueCell
How would you do to observe the change without having to know the underlying value type? It would be nice to avoid the code repetition in the value cell updateObserver function
Could AnyPublisher can be used here and how?
import UIKit
import Combine
print("Hello Playground")
protocol AnyParameter {
var anyValue: Any { get }
func set(value: Any)
}
protocol ParameterProtocol: AnyParameter {
associatedtype ValueType
var value: ValueType { get }
func set(value: ValueType)
}
public class Parameter<T>: ParameterProtocol {
typealias ValueType = T
#Published var value: T
var anyValue: Any { value }
init(value: T) {
self.value = value
}
func set(value: Any) {
guard let value = value as? T else { return }
set(value: value)
}
func set(value: T) {
self.value = value
}
}
public class AnyValueCell {
var parameter: AnyParameter {
didSet {
updateObserver()
}
}
var observer: AnyCancellable?
init(parameter: AnyParameter) {
self.parameter = parameter
updateObserver()
}
func updateObserver() {
observer?.cancel()
// This is the point of the question - How to make this generic?
// ---->
if let p = parameter as? Parameter<Int> {
observer = p.$value.sink() { value in
print("Update Cell -> \(value)")
}
return
}
if let p = parameter as? Parameter<Double> {
observer = p.$value.sink() { value in
print("Update Cell -> \(value)")
}
return
}
if let p = parameter as? Parameter<Bool> {
observer = p.$value.sink() { value in
print("Update Cell -> \(value)")
}
return
}
// <----
print("Wrong param type")
}
}
let intParam = Parameter<Int>(value: 42)
let doubleParam = Parameter<Double>(value: 3.14)
let boolParam = Parameter<Bool>(value: false)
var params: [AnyParameter] = [intParam, doubleParam, boolParam]
print ("--> Init Cells")
let cells: [AnyValueCell] = params.map { AnyValueCell(parameter: $0) }
print ("--> Change values")
intParam.set(value: 21)
doubleParam.set(value: 1.618)
boolParam.set(value: true)
Result, as expected:
Hello Playground
--> Init Cells
Update Cell -> 42
Update Cell -> 3.14
Update Cell -> false
--> Change values
Update Cell -> 21
Update Cell -> 1.618
Update Cell -> true
Add an anyValuePublisher property. You can (and maybe should) add it to AnyParameter, or you can define it in a separate protocol like this:
protocol AnyParameterPublishing: AnyParameter {
var anyValuePublisher: AnyPublisher<Any, Never> { get }
}
extension Parameter: AnyParameterPublishing {
var anyValuePublisher: AnyPublisher<Any, Never> {
return $value.map { $0 as Any }.eraseToAnyPublisher()
}
}
Then you can use it like this:
class AnyValueCell {
// ...
func updateObserver() {
guard let publishing = (parameter as? AnyParameterPublishing) else {
print("Wrong param type")
return
}
observer = publishing.anyValuePublisher
.sink { print("Update Cell -> \($0)") }
}
}
I am trying to convert a 2d array of Strings into my custom generic type Matrix:
func convert(_ arr: [[String]]) -> Matrix<Element> {
var m: Matrix<Element> = Matrix()
for row in arr {
var v: [Element] = []
for e in row {
let convE: Element = Element(string: e) // right here I'd like to implement something like that: Element(string: e)
v.append(convE)
}
m.vectors.append(Vector(v))
}
return m
}
The Matrix.Element does conform to the FloatingPoint protocol. Please tell me if you wish to see the Matrix struct but I think I haven't implemented anything that's important for this question other than that the generic Element type of Matrix does conform to the FloatingPoint protocol.
My problem is I want Element to be something like Float, Double... (any of the FloatingPoint types) but how can I initialize a FloatingPoint from a string? I tried:
extension FloatingPoint {
init(string: String) {
self.init(Int(string)!)
}
}
which obviously only works for strings like "1", "2"... and not "1.2", "3.541" and so on which I want.
Edit:(#Leo Dabus)
protocol DArray: Sequence {
associatedtype Component: FloatingPoint
}
extension DArray {
static func * <T: DArray>(lhs: Self, rhs: T) -> Vector<Component> {
let v = lhs as? Vector<Component> ?? rhs as! Vector<Component>
let m = lhs as? Matrix<Component> ?? rhs as! Matrix<Component>
return Vector(m.map { zip(v, $0).map(*).reduce(0, +) })
}
static func / <T: DArray>(lhs: Self, rhs: T) -> Vector<Component> {
let v = lhs as? Vector<Component> ?? lhs as! Vector<Component>
let m = lhs as? Matrix<Component> ?? lhs as! Matrix<Component>
return Vector(m.map { zip(v, $0).map(/).reduce(0, +) })
}
}
struct Vector<Component: FloatingPoint>: DArray {
var components: [Component]
var count: Int {
return components.count
}
init(_ Components: [Component] = []) {
self.components = Components
}
subscript(i: Int) -> Component {
get {
return components[i]
} set {
components[i] = newValue
}
}
static func + (lhs: Self, rhs: Self) -> Self {
return Vector(zip(lhs, rhs).map(+))
}
static func - (lhs: Self, rhs: Self) -> Self {
return Vector(zip(lhs, rhs).map(-))
}
static func * (lhs: Self, rhs: Self) -> Self {
return Vector(zip(lhs, rhs).map(*))
}
static func / (lhs: Self, rhs: Self) -> Self {
return Vector(zip(lhs, rhs).map(/))
}
func empty(of length: Int) -> Self {
return Vector(Array(repeating: 0, count: length))
}
}
struct Matrix<Component: FloatingPoint>: DArray {
var vectors: [Vector<Component>]
var nRows: Int {
return vectors.count
}
var nColumns: Int {
guard !vectors.isEmpty else { return 0 }
return vectors[0].count
}
var count: Int {
return vectors.count
}
init(_ vectors: [Vector<Component>] = []) {
self.vectors = vectors
}
subscript(r: Int) -> Vector<Component> {
get {
return vectors[r]
}
set {
vectors[r] = newValue
}
}
subscript(r: Int, c: Int) -> Component {
get {
return vectors[r][c]
}
set {
vectors[r][c] = newValue
}
}
}
Additionally I have my two structs conform to the Sequence protocol.
(Note: I am the OP)
What I came up with now is:
extension FloatingPoint {
public init?(string: String) {
if Self.self == Double.self {
self = Double(string) as! Self
} else if Self.self == Float.self {
self = Float(string) as! Self
} else if Self.self == Float80.self {
self = Float80(string) as! Self
} else {
return nil
}
}
}
It works for my use case but I was wondering whether it is a good way of achieving what I am looking for. So I'd be happy for someone to evaluate my solution. (#Leo Dabus)
You can extend FloatingPoint protocol and constrain the generic type to LosslessStringConvertible:
extension StringProtocol {
func floatingPoint<T: FloatingPoint>() -> T? where T: LosslessStringConvertible {
T(String(self))
}
}
Note that CGFloat does NOT conform to LosslessStringConvertible so you would need to implement a custom String initializer:
extension CGFloat: LosslessStringConvertible {
private static let formatter = NumberFormatter()
public init?(_ description: String) {
guard let number = CGFloat.formatter.number(from: description) as? CGFloat else { return nil }
self = number
}
}
let double: Double? = "2.7".floatingPoint() // 2.7
let float: Float? = "2.7".floatingPoint() // 2.7
let float80: Float80? = "2.7".floatingPoint() // 2.7
let cgfloat: CGFloat? = "2.7".floatingPoint() // 2.7
There is already an initializer for FloatingPoint types but to make your code work you need to conform your Matrix Component to LosslessStringConvertible.
Can you try something like this:
extension FloatingPoint where Self == Double {
init(string: String) {
self.init(Double(string)!)
}
}
extension FloatingPoint where Self == Float {
init(string: String) {
self.init(Float(string)!)
}
}
this should work as well
extension FloatingPoint {
init(string: String) {
self.init(Self(string)!)
}
}
I'm trying to convert the following to be generic.
extension RLMOrganization: DataProvider {
func getLastSyncToken() -> String {
let lastUpdated: RLMOrganization? = self.findAll(sortedBy: "syncToken").last
if let syncToken = lastUpdated?.syncToken {
return syncToken
} else {
return "00000000000000000000000000000000"
}
}
}
And have tried this:
protocol DataProvider: DatabaseLayer {
associatedtype T: Object
func findAll<T: Object>(sortedBy key: String) -> [T]
}
extension DataProvider {
func findAll<T: Object>(sortedBy key: String) -> [T] {
let database = self.getDatabase()
if let allObjects = database?.objects(T.self) {
let results = allObjects.sorted(byKeyPath: key, ascending: true)
return Array(results)
}
return []
}
func getLastSyncToken<T: Object>() -> String {
let lastUpdated = self.findAll(sortedBy: "syncToken").last as? T
if let value = lastUpdated?.value(forKey: "syncToken") { // get value from object by string name
let syncToken = value as! String
return syncToken
} else {
return "00000000000000000000000000000000"
}
}
...
But can't seem to overcome the error of:
Generic parameter 'T' is not used in function signature
I would think the compiler has everything it needs to determine type usage.
Below works for me, I don't know how findAll is defined but the problem is the reference to self as I see it so you need to define T there using associatedtype.
protocol DataProvider: DatabaseLayer {
associatedtype T: Object
func findAll(sortedBy: String) -> T?
}
I'm trying to get all the members of a generic class T, I can get the properties based on a specific class.
But, how I can do it using Mirror ?
let mirrored_object = Mirror(reflecting: user)
for (index, attr) in mirrored_object.children.enumerated() {
if let propertyName = attr.label as String! {
print("Attr \(index): \(propertyName) = \(attr.value)")
}
}
I added this as extension
extension NSObject {
public func GetAsJson() -> [[String:Any?]] {
var result:[[String: Any?]] = [[String: Any?]]()
for item in self {
var dict: [String: Any?] = [:]
for property in Mirror(reflecting: self).children {
dict[property.label!] = property.value
}
result.append(dict)
}
return result
}
}
Let say I have following code
class Foo {
}
var fooArray : Array<Foo> = Array<Foo>()
// This is important because in my code I will get Any (vs Array<Foo)
var fooArrayAny : Any = foo
I want to be able to get a Type Foo out of variable fooArrayAny.
If I had fooArray, I would do something like that:
let type = fooArray.dynamicType.Element().dynamicType
However, this doesn't work with fooArrayAny. It says that it has no member Element()
If you set NSObject as the base class of Foo, then you could use the following code:
class EVReflectionTests: XCTestCase {
func testArrayInstance() {
let fooArray : Array<Foo> = Array<Foo>()
let fooArrayAny : Any = fooArray
if let arr = fooArray as? Array {
let i = arr.getArrayTypeInstance(arr)
print("i = \(i)")
}
}
}
class Foo: NSObject {
}
extension Array {
public func getArrayTypeInstance<T>(arr:Array<T>) -> T {
return arr.getTypeInstance()
}
public func getTypeInstance<T>() -> T {
let nsobjectype : NSObject.Type = T.self as! NSObject.Type
let nsobject: NSObject = nsobjectype.init()
return nsobject as! T
}
}
This code is a snippet of my library EVReflection
Update:
I noticed a mistake in the code above. I used fooArray instead of fooArrayAny. When changing that to fooArrayAny I get the same error as you that the compiler does not have the Element. After playing around with this, I found out a solution that does work. Again it has parts of code of my EVReflection library.
class EVReflectionTests: XCTestCase {
func testArrayInstance() {
let fooArray : Array<Foo> = Array<Foo>()
let fooArrayAny : Any = fooArray
if let _ = fooArrayAny as? NSArray {
var subtype: String = "\(Mirror(reflecting: fooArrayAny))"
subtype = subtype.substringFromIndex((subtype.componentsSeparatedByString("<") [0] + "<").endIndex)
subtype = subtype.substringToIndex(subtype.endIndex.predecessor())
print("The type of the array elements = \(subtype)")
if let instance = swiftClassFromString(subtype) {
print("An instance of the array element = \(instance)")
let type = instance.dynamicType
print("An instance of the array element = \(type)")
}
}
}
// All code below is a copy from the EVReflection library.
func swiftClassFromString(className: String) -> NSObject? {
var result: NSObject? = nil
if className == "NSObject" {
return NSObject()
}
if let anyobjectype : AnyObject.Type = swiftClassTypeFromString(className) {
if let nsobjectype : NSObject.Type = anyobjectype as? NSObject.Type {
let nsobject: NSObject = nsobjectype.init()
result = nsobject
}
}
return result
}
func swiftClassTypeFromString(className: String) -> AnyClass! {
if className.hasPrefix("_Tt") {
return NSClassFromString(className)
}
var classStringName = className
if className.rangeOfString(".", options: NSStringCompareOptions.CaseInsensitiveSearch) == nil {
let appName = getCleanAppName()
classStringName = "\(appName).\(className)"
}
return NSClassFromString(classStringName)
}
func getCleanAppName(forObject: NSObject? = nil)-> String {
var bundle = NSBundle.mainBundle()
if forObject != nil {
bundle = NSBundle(forClass: forObject!.dynamicType)
}
var appName = bundle.infoDictionary?["CFBundleName"] as? String ?? ""
if appName == "" {
if bundle.bundleIdentifier == nil {
bundle = NSBundle(forClass: EVReflection().dynamicType)
}
appName = (bundle.bundleIdentifier!).characters.split(isSeparator: {$0 == "."}).map({ String($0) }).last ?? ""
}
let cleanAppName = appName
.stringByReplacingOccurrencesOfString(" ", withString: "_", options: NSStringCompareOptions.CaseInsensitiveSearch, range: nil)
.stringByReplacingOccurrencesOfString("-", withString: "_", options: NSStringCompareOptions.CaseInsensitiveSearch, range: nil)
return cleanAppName
}
}
class Foo: NSObject {
}
The output of this code will be:
The type of the array elements = Foo
An instance of the array element = <EVReflection_iOS_Tests.Foo: 0x7fd6c20173d0>
An instance of the array element = Foo
Swift 5
Its old but I want to share my version if someone needs it.
I use ModelProtocol and I suggests you use protocol so we can do operation to model via protocol (ex: static instantiating).
protocol ModelProtocol {}
class Foo: ModelProtocol {
}
Since I can't check type is Array, I use CollectionProtocol and create Array extension to get Element via protocol.
protocol CollectionProtocol {
static func getElement() -> Any.Type
}
extension Array: CollectionProtocol {
static func getElement() -> Any.Type {
return Element.self
}
}
Testing.
var fooArray: Array<Foo> = Array<Foo>()
var fooArrayAny: Any = fooArray
let arrayMirrorType = type(of: fooArrayAny)
String(describing: "arrayMirrorType: \(arrayMirrorType)")
if arrayMirrorType is CollectionProtocol.Type {
let collectionType = arrayMirrorType as! CollectionProtocol.Type
String(describing: "collectionType: \(collectionType)")
let elementType = collectionType.getElement()
String(describing: "elementType: \(elementType)")
let modelType = elementType as! ModelProtocol.Type
String(describing: "modelType: \(modelType)")
// ... now you can do operation to modelType via ModelProtocol
}
Printing.
arrayMirrorType: Array<Foo>
collectionType: Array<Foo>
elementType: Foo
modelType: Foo
class Foo {
var foo: Int = 1
}
struct Boo {
var boo: String = "alfa"
}
func f(array: Any) {
let mirror = Mirror(reflecting: array)
let arraytype = mirror.subjectType
switch arraytype {
case is Array<Foo>.Type:
let fooArray = array as! Array<Foo>
print(fooArray)
case is Array<Boo>.Type:
let booArray = array as! Array<Boo>
print(booArray)
default:
print("array is not Array<Foo> nor Array<Boo>")
break
}
}
var fooArray : Array<Foo> = []
fooArray.append(Foo())
var anyArray : Any = fooArray // cast as Any
f(anyArray) // [Foo]
var booArray : Array<Boo> = []
booArray.append(Boo())
anyArray = booArray // cast as Any
f(anyArray) // [Boo(boo: "alfa")]
var intArray : Array<Int> = []
anyArray = intArray // cast as Any
f(anyArray) // array is not Array<Foo> nor Array<Boo>