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news 2025/7/12 21:06:32

東方網(wǎng)站建設(shè),百度打開百度搜索,系統(tǒng)定制開發(fā),企業(yè)網(wǎng)站開發(fā)職責前言： 各位同學(xué)有段時間沒有見面因為一直很忙所以就沒有去更新博客。最近有在學(xué)習這個鴻蒙的ark ui開發(fā) 因為鴻蒙不是發(fā)布了一個鴻蒙next的測試版本明年會啟動純血鴻蒙應(yīng)用所以我就想提前給大家寫一些博客文章效果圖具體實現(xiàn) 我們在鴻蒙的ark ui 里面列表使…

前言：

各位同學(xué)有段時間沒有見面因為一直很忙所以就沒有去更新博客。最近有在學(xué)習這個鴻蒙的ark ui開發(fā) 因為鴻蒙不是發(fā)布了一個鴻蒙next的測試版本明年會啟動純血鴻蒙應(yīng)用所以我就想提前給大家寫一些博客文章

效果圖

具體實現(xiàn)

我們在鴻蒙的ark ui 里面列表使用我們的Swiper組件來實現(xiàn) 我們的輪播圖

準備數(shù)據(jù)源

import { PictureItem } from '../bean/PictureItem';/*** Pictures of banner.*/
export const PICTURE_BANNER: PictureItem[] = [{ 'id': '1', 'name': '怒海', 'description': '怒海波濤', 'image': $r('app.media.image1') },{ 'id': '2', 'name': '大山深處', 'description': '大山深處感人的親情之歌', 'image': $r('app.media.image2') },{ 'id': '3', 'name': '荒漠', 'description': '荒漠的親情之歌', 'image': $r('app.media.image3') }
];/*** type of pictures.*/
export enum PictureType {BANNER = 'banner',
}

Bean類


/*** Picture entity class.*/
export class PictureItem {id: string;name: string;description: string;image: Resource;constructor(id: string, name: string, description: string, image: Resource) {this.id = id;this.name = name;this.description = description;this.image = image;}
}

寬高常量配置


/*** Common constants for all features.*/
export class CommonConstants {/*** animation duration of tab content switching.*/static readonly DURATION_ADS = 200;/*** height of carousel title.*/static readonly HEIGHT_CAROUSEL_TITLE = 90;/*** fontSize of description.*/static readonly FONT_SIZE_DESCRIPTION = 12;/*** font size of title.*/static readonly FONT_SIZE_TITLE = 20;static readonly FONT_WEIGHT_LIGHT = 400;/*** bold font.*/static readonly FONT_WEIGHT_BOLD = 700;/*** page layout weight.*/static readonly LAYOUT_WEIGHT = 1;/*** border angle.*/static readonly BORDER_RADIUS = 12;/*** line height for more.*/static readonly LINE_HEIGHT_MORE = 19;/*** rolling duration.*/static readonly SWIPER_TIME = 1500;/*** margin of text bottom.*/static readonly BOTTOM_TEXT = 4;/*** margin of banner top.*/static readonly TOP_ADS = 12;/*** margin of banner left.*/static readonly ADS_LEFT = 12;/** maximum width.*/static readonly FULL_WIDTH = '100%';/*** maximum height.*/static readonly FULL_HEIGHT = '100%';/*** width of tab page.*/static readonly PAGE_WIDTH = '100%';/*** height of banner.*/static readonly HEIGHT_BANNER = '27%';}

具體布局


import router from '@ohos.router';
import { PictureItem } from '../bean/PictureItem';
import { PictureType } from '../constants/PictureConstants';
import { initializePictures, startPlay, stopPlay } from './PictureViewModel';
import { CommonConstants } from '../constants/CommonConstant';@Extend(Text) function textStyle(fontSize: number, fontWeight: number) {.fontSize(fontSize).fontColor($r('app.color.start_window_background')).fontWeight(fontWeight)
}/*** Carousel banner.*/
@Component
export struct Banner {@State index: number = 0;private imageArray: Array<PictureItem> = [];private swiperController: SwiperController = new SwiperController();aboutToAppear() {// Data Initialization.this.imageArray = initializePictures(PictureType.BANNER);// Turn on scheduled task.startPlay(this.swiperController);}aboutToDisappear() {stopPlay();}build() {Swiper(this.swiperController) {ForEach(this.imageArray, item => {Stack({ alignContent: Alignment.TopStart }) {Image(item.image).objectFit(ImageFit.Fill).height(CommonConstants.FULL_HEIGHT).width(CommonConstants.FULL_WIDTH).borderRadius(CommonConstants.BORDER_RADIUS).align(Alignment.Center).onClick(() => {console.log("點擊事件 item"+item.id)})Column() {Text($r('app.string.movie_classic')).textStyle(CommonConstants.FONT_SIZE_DESCRIPTION, CommonConstants.FONT_WEIGHT_LIGHT).margin({ bottom: CommonConstants.BOTTOM_TEXT })Text(item.name).textStyle(CommonConstants.FONT_SIZE_TITLE, CommonConstants.FONT_WEIGHT_BOLD)}.alignItems(HorizontalAlign.Start).height(CommonConstants.HEIGHT_CAROUSEL_TITLE).margin({ top: CommonConstants.TOP_ADS, left: CommonConstants.ADS_LEFT })}.height(CommonConstants.FULL_HEIGHT).width(CommonConstants.FULL_WIDTH)}, item => JSON.stringify(item))}.width(CommonConstants.PAGE_WIDTH).height(CommonConstants.HEIGHT_BANNER).index(this.index).indicatorStyle({ selectedColor: $r('app.color.start_window_background') }).indicator(true).duration(CommonConstants.DURATION_ADS)}
}

使用 indicator 屬性設(shè)置是否支持自動輪播

.indicator(true)

設(shè)置自動輪播間隔時間

.duration(CommonConstants.DURATION_ADS)

viewmodel 實現(xiàn)

import { PictureItem } from '../bean/PictureItem';
import { PICTURE_BANNER} from '../constants/PictureConstants';
import { PictureType } from '../constants/PictureConstants';
import { CommonConstants } from '../constants/CommonConstant';/*** Initialize picture data according to type.** @param initType Init type.*/
export function initializePictures(initType: string): Array<PictureItem> {let imageDataArray: Array<PictureItem> = [];switch (initType) {case PictureType.BANNER:PICTURE_BANNER.forEach((item) => {imageDataArray.push(new PictureItem(item.id, item.name, item.description, item.image));})break;default:break;}return imageDataArray;
}let timerIds: number[] = [];/*** start scheduled task.** @param swiperController Controller.*/
export function startPlay(swiperController: SwiperController) {let timerId = setInterval(() => {swiperController.showNext();}, CommonConstants.SWIPER_TIME);timerIds.push(timerId);
}/*** stop scheduled task.*/
export function stopPlay() {timerIds.forEach((item) => {clearTimeout(item);})
}