protocols

问题 I need to set up a protocol for fast command/response interactions. My instinct tells me to just knock together a simple protocol with CRLF separated ascii strings like how SMTP or POP3 works, and tunnel it through SSH/SSL if I need it to be secured. While I could just do this, I'd prefer to build on an existing technology so people could use a friendly library rather than the socket library interface the OS gives them. I need... Commands and responses passing structured data back and forth.

问题 So I have two arrays var arrayOne:Array<protocol<P1,P2>> var arrayTwo:Array<P1> Where P1 and P2 are protocols. Question is how to make downcasting operation arrayTwo = arrayOne as Array<P1> What i get from Xcode is: Cannot convert value of type 'Array<protocol<P1, P2>>' to specified type 'Array<P1>' 回答1: You need to cast the elements of the array, not the array itself. arrayTwo = arrayOne.map { $0 as P1 } Or as MartinR stated, there is even no need to cast the element. arrayTwo = arrayOne.map

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I'm interested in createing Visual frontend to GDB. So I'm interested is there any library to handle remote protocol of GDB from .Net

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I'm interested in createing Visual frontend to GDB. So I'm interested is there any library to handle remote protocol of GDB from .Net

问题 I am creating a framework named MyFramework containing LoginProtocol.swift which has some default behaviours import UIKit public protocol LoginProtocol { func appBannerImage() -> UIImage? func appLogoImage() -> UIImage? } extension LoginProtocol { func appBannerImage() -> UIImage? { return (UIImage(named: "login_new_top")) } func appLogoImage() -> UIImage? { return (UIImage(named: "appLogo")) } } Next, I am adding a new target to create a demo application named MyDemoApp which is using

问题 Following code: protocol SomeProtocol { typealias SomeType = Int // used typealias-assignment func someFunc(someVar: SomeType) } class SomeClass: SomeProtocol { func someFunc(someVar: SomeType) { print(someVar) } } gives compile-time error: Use of undeclared type 'SomeType' Adding, say typealias SomeType = Double , to the SomeClass resolves the error. The question is, what's the point of typealias-assignment part (which is optional btw) of protocol associated type declaration though? 回答1: In

问题 i want to create functionality like interface in swift, my goal is when i call another class suppose i'm calling API and the response of that class i want to reflect in to my current screen, in android interface is used to achieve but what should i use in swift for that? can anyone help me with example. the code for android is given below... public class ExecuteServerReq { public GetResponse getResponse = null; public void somemethod() { getResponse.onResponse(Response); } public interface

问题 I'm implementing a very custom NavigationLink called MenuItem and would like to reuse it across the project. It's a struct that conforms to View and implements var body : some View which contains a NavigationLink . I need to somehow store the view that shall be presented by NavigationLink in the body of MenuItem but have yet failed to do so. I have defined destinationView in MenuItem 's body as some View and tried two initializers: This seemed too easy: struct MenuItem: View { private var

问题 This is my playground code: protocol A { init(someInt: Int) } func direct(a: A) { // Doesn't work let _ = A.init(someInt: 1) } func indirect<T: A>(a: T) { // Works let _ = T.init(someInt: 1) } struct B: A { init(someInt: Int) { } } let a: A = B(someInt: 0) // Works direct(a: a) // Doesn't work indirect(a: a) It gives a compile time error when calling method indirect with argument a . So I understand <T: A> means some type that conforms to A . The type of my variable a is A and protocols do

问题 I'm trying to understand how to filter objects that conform to a generic protocol. Let's assume I have this set up (which compiles perfectly): public protocol StoryItem { var id: Int64? { get } } public protocol Restorable: AnyObject { associatedtype T : StoryItem var storyItem: T? { get set } } public struct LabelItem: StoryItem { public var id: Int64? public var text: String? } public struct StickerItem: StoryItem { public var id: Int64? public var imageName: String? } class LabelView: