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【HarmonyOS】鸿蒙中Interface实例实现的书写格式

news 2024/11/7 20:19:35

【HarmonyOS】鸿蒙中Interface实例实现的书写格式

ArkTS中Interface的定义和实现：

一、接口的定义：

TestInterface .ets

// 添加export 在其他类才能导入，需要特别注意
export interface TestInterface {// 与java等语法不同的点，定义函数时通过 （）=> void 来表达。onTest: (s: string, n: number) => void// => 箭头后表示返回值onTest2: (s: string) => string}

有些同学在定义上，依旧与java等语法相同，在接口实现时就会报错，提示：
Object literal must correspond to some explicitly declared class or interface (arkts-no-untyped-obj-literals)

二、接口的实现：
当接口定义后，我们在需要调用实现interface接口处进行实例化接口的实现：
1.我们可以直接创建全局对象进行接口的实例化：

  private mTestInterface: TestInterface = {onTest: (s: string, n: number) => {console.log(this.TAG, "s: " + s + " n:" + n);},onTest2: (s: string) => {return s;}}this.mTestInterface.onTest("test", 1);this.mTestInterface.onTest2("1")

2.亦或者通过匿名的形式进行接口的实现：

   let testCallBack: TestInterface = {onTest: (s: string, n: number) => {console.log(this.TAG, "s: " + s + " n:" + n);},onTest2: (s: string) => {return s;}}testCallBack.onTest("test", 1);

DEMO示例：

import { TestInterface } from '../interface/TestInterface';@Entry
@Component
struct InterfacePage {private TAG: string = "InterfacePage";aboutToAppear(): void {this.mTestInterface.onTest("test", 1);}private mTestInterface: TestInterface = {onTest: (s: string, n: number) => {console.log(this.TAG, "s: " + s + " n:" + n);},onTest2: (s: string) => {return s;}}build() {Row() {Text(this.mTestInterface.onTest2("1")).fontSize(50)}.height('100%').width('100%').justifyContent(FlexAlign.Center)}
}export interface TestInterface {onTest: (s: string, n: number) => voidonTest2: (s: string) => string}