protocols

问题 I'm new in IOS, and can't understand some things about delegates and protocols. In my project I'm using AMSlideMenu for slide menu. I need to update same data in slide menu. For that I need to catch openMenu callback. In instruction for slide menu I found this If you want to get menu's open/close callbacks, then set MainVC's delegate property, and implement protocol named 'AMSlideMenuProtocols'. @optional - (void)leftMenuWillOpen; - (void)leftMenuDidOpen; - (void)rightMenuWillOpen; - (void

问题 I've always wondered why when I see examples of protocols people tend to add most of the functions via an extension. Like this: protocol Flashable {}//Can be empty becuase function is in extension extension Flashable where Self: UIView //Makes this protocol work ONLY if object conforms to UIView (ie. uilable, uibutton, etc.) { func flash() { UIView.animate(withDuration: 0.3, delay: 0, options: .curveEaseIn, animations: { self.alpha = 1.0 //Object fades in }) { (animationComplete) in if

问题 I have the following function to return the normalized version of an array whose elements could be Int, Double, Float. I'm getting the error indicated on line 5 below. I thought the Numeric protocol would address the binary operation but I guess not. What am I doing wrong? func normalizeArray<T: Comparable & Numeric>(a: [T]) -> [T] { let min: T = a.min()! let max: T = a.max()! let n = a.map({ ($0 - min) / (max - min) }) <--- Binary operator '/' cannot be applied to two 'T' operands return n }

问题 I am working in iPhone app with 5 screens. I want to refresh the values in the screen 4th in UITabBarController. I have added @protocol in AppDelegate but it is not calling. This is the first time am using @protocol could you please help me to solve this issue, In AppDelegate.h @protocol ReloadViewControllerDelegate <NSObject> -(void) refreshViewController:(NSString *)result; @end id refreshViewControllerDelegate; @property (nonatomic, retain) id refreshViewControllerDelegate; and i have

问题 https://www.raywenderlich.com/148448/introducing-protocol-oriented-programming protocol Bird { var name: String { get } var canFly: Bool { get } func doSomething() } protocol Flyable { var airspeedVelocity: Double { get } } extension Bird { // Flyable birds can fly! var canFly: Bool { return self is Flyable } func doSomething() { print("default Bird: \(name)") } } class FlappyBird: Bird, Flyable { let name: String let canFly = true var airspeedVelocity: Double = 5.0 init(name: String) { self

问题 I would like to generate an URL in Twig like this (usecase is subscribable calendar): webcal://subdomain.mydomain.com/calendar.ics The filename is given via twig: global: ... in config an {{ filename }} in twig. My problem is, that using {{ url('index') }} the generated URL uses http:// as protocol, but I need webcal:// . I also see no way to fix this by using schemes, because this protocol is special for just this case and none of the routes generated by that 'Index-'Controller. I am

问题 In near future I'll need to start working on a new project that consist of highly loaded TCP/IP servers and clients that communicate to that server. I know the basics of TCP/IP and can make the server and clients talk over the wire. The problem is that I need to find some ways to protect server against other "clients" that can send bogus data and may crash the server. I'm looking for any ideas or recommendations for an application-level protocol that I can use for my application. Pretty sure

问题 In my application, I need to return the "Class" as a return type like: Application.m: + (Class)getParserClass { return [NCCurrencyParser class]; } NCCurrencyParser.m: @interface NCCurrencyParser NSObject <NCParser> @protocol NCParser +(NSNumber *)parserNumber:(NSNumber *)number; in the caller method: Class parserClass = [Application getParserClass]; [parserClass parserNumber:1.0]; But then the compiler gives me the error that parserClass may not respond to parseNumber. How can I force the

问题 This is a very similar question: Calling protocol default implementation from regular method, BUT none of the answers cover the case when inherance plays a role . The answer suggest casting it to the protocol type itself will solve it, but not in this case (Copy paste in playground): public protocol MyProtocol { func sayCheese() } public extension MyProtocol { func sayHi() { print("Hi, I am protocol") sayCheese() } func sayCheese() { print("Cheese from protocol") } } public class MyFirstClass

问题 I am using protocol.Protocol to receive data from a server. As follows from twisted.internet.protocol import Protocol, Factory class MyProtocol(Protocol): def dataReceived(self, data): print data class MyFactory(Factory): def startedConnecting(self, connector): print 'Started to connect.' def buildProtocol(self, addr): print 'Connected.' return MyProtocol() When I receive large data, due to the TCP stream fragmentation, I only receive part of the incoming messages. I m trying to buffer the