interface

问题 So i connect Typescript with hooks. When i try to render Register User in parent component i getting error: interface IRegisterUser { mail: string; password: string; }; let RegisterUser: React.FC<IRegisterUser> = (props) => { const InitialUserState = {mail: "", password: ""} const [user, setUser] = useState(InitialUserState) useEffect(() => { }, []); return ( <div> <input type="text" className="text" name="username" value={user.mail} placeholder="" required/> <input type="text" className=

问题 Good day to you all. I'm experiencing quite an issue right now with my simple Android application. The 2 main elements I have are a bound Service and a main Activity . I want the Activity to display (through TextViews) the fact that the Service found something. To do so, I declare a Listener interface within the Service, handle a list of listeners registered to him and notify the listeners with a specific method. MyService void notifyNewElement(){ for (Listener listener : listeners) {

问题 Hi I have created a Watch app which has two pages but when I run it on apple watch and do switch between pages after few seconds one page(sometimes page1 and sometimes page2)goes black and It doesn’t show my buttons, labels nothing. But when I run it on simulator there is no problem everything is fine and also before i add second page to the app It was ok on apple watch too 回答1: I had the same issue and it was due to calling crownSequencer.focus() without a corresponding crownSequencer

问题 Every time I set the width of my view to my scroll view it pushes the green square off the screen. 回答1: @belgrim I had had a rough time working with scroll views. I would like to share my work around. First, drag a scroll view to your storyboard and pin in to four sides. Then, add a view inside the scroll view and pin it to the four sides of its superview (i.e. the scroll view) The result would look like this (Don't worry about the red markers, those will be fixes in the next steps) Add a

问题 According to the specification: Interface values are comparable. Two interface values are equal if they have identical dynamic types and equal dynamic values or if both have value nil. var err error var reader io.Reader As far as understand, err and reader have different dynamic types ( error and io.Reader ) and therefore are not comparable. fmt.Println(err == reader) will cause a compile error: invalid operation: err == reader (mismatched types error and io.Reader) If it is true, why Println

问题 Looks like in TypeScript it's absolutely fine (from the compiler perspective) to have such code: class Vehicle { public run(): void { console.log('Vehicle.run'); } } class Task { public run(): void { console.log('Task.run'); } } function runTask(t: Task) { t.run(); } runTask(new Task()); runTask(new Vehicle()); But at the same time I would expect a compilation error , because Vehicle and Task don't have anything in common. And sane usages can be implemented via explicit interface definition:

问题 In Grails 3.3.3, when I run generate-all for a domain class, a Service Interface is generates (versus the actual Service Class from Grails 2.x). I actually didn't notice it until I tried to add a method to my service. The interface gets placed in the services folder where the service would live. I actually do like the interface but I still want the service and the default implementations. How can I have both an interface and implementation live in the services folder if the interface already

问题 In Grails 3.3.3, when I run generate-all for a domain class, a Service Interface is generates (versus the actual Service Class from Grails 2.x). I actually didn't notice it until I tried to add a method to my service. The interface gets placed in the services folder where the service would live. I actually do like the interface but I still want the service and the default implementations. How can I have both an interface and implementation live in the services folder if the interface already

问题 As I had before in Java, I try to do a ServiceLocator in Delphi. Some code exist but it's didn't work like expected. I don't want a case with enum or anything else, I want a code that I don't have to touch when I create a new class. I have a global interface for my application, and all the other : type IMyApp = interface end; IBuilder = interface(IMyApp) procedure Build; end; IPrint = interface(IMyApp) procedure Print; end; ICalculator = interface(IMyApp) procedure Calc; end; I want a class

问题 In the below example, the module outer has a private type Private and a private inner module inner . inner is able to access Private (because child modules can access their parent's private items , even if they are not parked as public). inner defines a function not_really_public_interface() . While it is marked as public, it is really only available to outer because inner itself is not public. outer.rs struct Private; mod inner { use super::Private; pub fn not_really_public_interface() ->