HarmonyOs编写一个案例实现一个照片选择（阶段进阶 四种需求 逐一完善）

 需求1. .实现照片选择 并将选择好的照片展示出来

import { GoodItem } from '../06/modules';@Entry
@Component
struct PhotoPage {@State message: string = '实现一个相册';@State List: GoodItem[] = [{goods_name: 'dsfjlsjkfsf',goods_price: 100,goods_img: 'https://img1.baidu.com/it/u=1535232938,2370569369&fm=253&fmt=auto&app=120&f=JPEG?w=1280&h=800',goods_count: 1,id: 1},{goods_name: 'dfhlsdjflkdsjklfs 加速度的佛教山東i附件',goods_price: 200,goods_img: 'https://img1.baidu.com/it/u=2603934083,3021636721&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 2,id: 2},{goods_name: '收到回复技术大会哦恶化日发方大化工iu而韩国佛热',goods_price: 300,goods_img: 'https://img0.baidu.com/it/u=4289818793,3552718550&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 3,id: 3}, {goods_name: '的時間佛薩飛機埃里克森放假哦i二fore多氟多化工i額方法過後i額外人',goods_price: 400,goods_img: 'https://img0.baidu.com/it/u=2080725050,2021436341&fm=253&fmt=auto&app=138&f=JPEG?w=1200&h=800',goods_count: 4,id: 4}, {goods_name: '时间佛ID分机构IE',goods_price: 500,goods_img: 'https://img1.baidu.com/it/u=4202924242,2178453218&fm=253&fmt=auto&app=120&f=JPEG?w=1422&h=800',goods_count: 5,id: 5}, {goods_name: '司法鉴定哦is叫哦私人',goods_price: 600,goods_img: 'https://10wallpaper.com/wallpaper/1680x1050/1405/Lavender_mountain_river-Landscape_HD_Wallpaper_1680x1050.jpg',goods_count: 6,id: 6}]@State isShowPhotoCom: boolean = false@State maxSelectNum: number = 4@State showSelectImgs: GoodItem[] = []build() {Column() {Button('选择图片').onClick(() => {this.isShowPhotoCom = true})Grid() {ForEach(this.showSelectImgs, (item: GoodItem, index) => {GridItem() {Image(item.goods_img).aspectRatio(1)}})}.columnsTemplate('1fr 1fr').columnsGap(4).rowsGap(4)if (this.isShowPhotoCom) {photoCom({List: this.List,isShowPhotoCom: this.isShowPhotoCom,maxSelectNum: this.maxSelectNum,showSelectImgs: this.showSelectImgs})}}.height('100%').width('100%')}
}@Component
struct photoCom {@Prop List: GoodItem[] = []@Link isShowPhotoCom: boolean@State selectList: GoodItem[] = []@Prop maxSelectNum: number@Link showSelectImgs: GoodItem[]// 选择图片逻辑selectFn(item: GoodItem) {let Index = this.selectList.findIndex(obj => obj.id == item.id)console.log(JSON.stringify(Index))if (Index > -1) {this.selectList.splice(Index, 1)} else {this.selectList.push(item)}}build() {Column() {Grid() {ForEach(this.List, (item: GoodItem, index) => {GridItem() {Stack() {Image(item.goods_img).aspectRatio(1)if (this.selectList.some(obj => obj.id == item.id)) {Image($r('app.media.select')).width(60).height(60).fillColor(Color.Red)}}.onClick(() => {this.selectFn(item)})}})}.columnsTemplate('1fr 1fr').layoutWeight(1)// Text(`${}/${}`)Row() {Button('取消').onClick(() => {this.isShowPhotoCom = false})Text(`已选${this.selectList.length}张/最多选择${this.maxSelectNum}张`)Button('确认').onClick(() => {this.showSelectImgs = this.selectListthis.isShowPhotoCom = false})}.width('100%').height(60).justifyContent(FlexAlign.SpaceAround)}.position({ x: 0, y: 0 }).width('100%').height('100%').backgroundColor(Color.White).justifyContent(FlexAlign.SpaceBetween)}
}

这个案例用到了父子传参@Prop @Link   @State  各种样式交互 有兴趣可敲着玩玩~

我们看下效果

点击按钮

出现这个页面

然后执行选中逻辑

然后点击确认关闭弹窗

 需求2. 点击图片实现预览效果（CustomDilog）

import { GoodItem } from '../06/modules';@Entry
@Component
struct PhotoPage {@State message: string = '实现一个相册';@State List: GoodItem[] = [{goods_name: 'dsfjlsjkfsf',goods_price: 100,goods_img: 'https://img1.baidu.com/it/u=1535232938,2370569369&fm=253&fmt=auto&app=120&f=JPEG?w=1280&h=800',goods_count: 1,id: 1},{goods_name: 'dfhlsdjflkdsjklfs 加速度的佛教山東i附件',goods_price: 200,goods_img: 'https://img1.baidu.com/it/u=2603934083,3021636721&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 2,id: 2},{goods_name: '收到回复技术大会哦恶化日发方大化工iu而韩国佛热',goods_price: 300,goods_img: 'https://img0.baidu.com/it/u=4289818793,3552718550&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 3,id: 3}, {goods_name: '的時間佛薩飛機埃里克森放假哦i二fore多氟多化工i額方法過後i額外人',goods_price: 400,goods_img: 'https://img0.baidu.com/it/u=2080725050,2021436341&fm=253&fmt=auto&app=138&f=JPEG?w=1200&h=800',goods_count: 4,id: 4}, {goods_name: '时间佛ID分机构IE',goods_price: 500,goods_img: 'https://img1.baidu.com/it/u=4202924242,2178453218&fm=253&fmt=auto&app=120&f=JPEG?w=1422&h=800',goods_count: 5,id: 5}, {goods_name: '司法鉴定哦is叫哦私人',goods_price: 600,goods_img: 'https://10wallpaper.com/wallpaper/1680x1050/1405/Lavender_mountain_river-Landscape_HD_Wallpaper_1680x1050.jpg',goods_count: 6,id: 6}]@State isShowPhotoCom: boolean = false@State maxSelectNum: number = 4@State showSelectImgs: GoodItem[] = []@State selectImage: ResourceStr | string = ''previw: CustomDialogController = new CustomDialogController({builder: PreviewDilog({ url: this.selectImage }),customStyle: true})build() {Column() {Button('选择图片').onClick(() => {this.isShowPhotoCom = true})Grid() {ForEach(this.showSelectImgs, (item: GoodItem, index) => {GridItem() {Image(item.goods_img).aspectRatio(1).onClick(() => {this.selectImage = item.goods_imgthis.previw.open()})}})}.columnsTemplate('1fr 1fr').columnsGap(4).rowsGap(4)if (this.isShowPhotoCom) {photoCom({List: this.List,isShowPhotoCom: this.isShowPhotoCom,maxSelectNum: this.maxSelectNum,showSelectImgs: this.showSelectImgs})}}.height('100%').width('100%')}
}@Component
struct photoCom {@Prop List: GoodItem[] = []@Link isShowPhotoCom: boolean@State selectList: GoodItem[] = []@Prop maxSelectNum: number@Link showSelectImgs: GoodItem[]// 选择图片逻辑selectFn(item: GoodItem) {let Index = this.selectList.findIndex(obj => obj.id == item.id)console.log(JSON.stringify(Index))if (Index > -1) {this.selectList.splice(Index, 1)} else {this.selectList.push(item)}}build() {Column() {Grid() {ForEach(this.List, (item: GoodItem, index) => {GridItem() {Stack() {Image(item.goods_img).aspectRatio(1)if (this.selectList.some(obj => obj.id == item.id)) {Image($r('app.media.select')).width(60).height(60).fillColor(Color.Red)}}.onClick(() => {this.selectFn(item)})}})}.columnsTemplate('1fr 1fr').layoutWeight(1)// Text(`${}/${}`)Row() {Button('取消').onClick(() => {this.isShowPhotoCom = false})Text(`已选${this.selectList.length}张/最多选择${this.maxSelectNum}张`)Button('确认').onClick(() => {this.showSelectImgs = this.selectListthis.isShowPhotoCom = false})}.width('100%').height(60).justifyContent(FlexAlign.SpaceAround)}.position({ x: 0, y: 0 }).width('100%').height('100%').backgroundColor(Color.White).justifyContent(FlexAlign.SpaceBetween)}
}@CustomDialog
struct PreviewDilog {controller: CustomDialogController = new CustomDialogController({ builder: CustomDialogController })url: ResourceStr | string = ''build() {Column() {Image(this.url).width('100%')}.width('100%').height('100%').backgroundColor(Color.Black).justifyContent(FlexAlign.Center).onClick(() => {this.controller.close()})}
}

圈下重点代码部分

子组件的

 父组件的

需求3.HarmonyOs半模态bindsheet编写一个案例实现一个照片选择

import { GoodItem } from '../06/modules';@Entry
@Component
struct PhotoCasePage {@State message: string = '实现一个相册';@State List: GoodItem[] = [{goods_name: 'dsfjlsjkfsf',goods_price: 100,goods_img: 'https://img1.baidu.com/it/u=1535232938,2370569369&fm=253&fmt=auto&app=120&f=JPEG?w=1280&h=800',goods_count: 1,id: 1},{goods_name: 'dfhlsdjflkdsjklfs 加速度的佛教山東i附件',goods_price: 200,goods_img: 'https://img1.baidu.com/it/u=2603934083,3021636721&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 2,id: 2},{goods_name: '收到回复技术大会哦恶化日发方大化工iu而韩国佛热',goods_price: 300,goods_img: 'https://img0.baidu.com/it/u=4289818793,3552718550&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 3,id: 3}, {goods_name: '的時間佛薩飛機埃里克森放假哦i二fore多氟多化工i額方法過後i額外人',goods_price: 400,goods_img: 'https://img0.baidu.com/it/u=2080725050,2021436341&fm=253&fmt=auto&app=138&f=JPEG?w=1200&h=800',goods_count: 4,id: 4}, {goods_name: '时间佛ID分机构IE',goods_price: 500,goods_img: 'https://img1.baidu.com/it/u=4202924242,2178453218&fm=253&fmt=auto&app=120&f=JPEG?w=1422&h=800',goods_count: 5,id: 5}, {goods_name: '司法鉴定哦is叫哦私人',goods_price: 600,goods_img: 'https://10wallpaper.com/wallpaper/1680x1050/1405/Lavender_mountain_river-Landscape_HD_Wallpaper_1680x1050.jpg',goods_count: 6,id: 6}]@State isShowPhotoCom: boolean = false@State maxSelectNum: number = 4@State showSelectImgs: GoodItem[] = []@State selectImage: ResourceStr | string = ''previw: CustomDialogController = new CustomDialogController({builder: PreviewDilog({ url: this.selectImage }),customStyle: true})@BuildersheetBuilder() {Column() {photoCom({List: this.List,isShowPhotoCom: this.isShowPhotoCom,maxSelectNum: this.maxSelectNum,showSelectImgs: this.showSelectImgs})}}build() {Column() {Button('选择图片').onClick(() => {this.isShowPhotoCom = true})Grid() {ForEach(this.showSelectImgs, (item: GoodItem, index) => {GridItem() {Image(item.goods_img).aspectRatio(1).onClick(() => {this.selectImage = item.goods_imgthis.previw.open()})}})}.columnsTemplate('1fr 1fr').columnsGap(4).rowsGap(4)}.height('100%').width('100%').bindSheet(this.isShowPhotoCom, this.sheetBuilder, {showClose: false})}
}// 选择图片组件
@Component
struct photoCom {@Prop List: GoodItem[] = []@Link isShowPhotoCom: boolean@State selectList: GoodItem[] = []@Prop maxSelectNum: number@Link showSelectImgs: GoodItem[]// 选择图片逻辑selectFn(item: GoodItem) {let Index = this.selectList.findIndex(obj => obj.id == item.id)console.log(JSON.stringify(Index))if (Index > -1) {this.selectList.splice(Index, 1)} else {this.selectList.push(item)}}build() {Column() {Grid() {ForEach(this.List, (item: GoodItem, index) => {GridItem() {Stack() {Image(item.goods_img).aspectRatio(1)if (this.selectList.some(obj => obj.id == item.id)) {Image($r('app.media.select')).width(60).height(60).fillColor(Color.Red)}}.onClick(() => {this.selectFn(item)})}})}.columnsTemplate('1fr 1fr').layoutWeight(1)// Text(`${}/${}`)Row() {Button('取消').onClick(() => {this.isShowPhotoCom = false})Text(`已选${this.selectList.length}张/最多选择${this.maxSelectNum}张`)Button('确认').onClick(() => {this.showSelectImgs = this.selectListthis.isShowPhotoCom = false})}.width('100%').height(60).justifyContent(FlexAlign.SpaceAround)}.width('100%').height('100%').backgroundColor(Color.White).justifyContent(FlexAlign.SpaceBetween)}
}// 查看图片的组件
@CustomDialog
struct PreviewDilog {controller: CustomDialogController = new CustomDialogController({ builder: CustomDialogController })url: ResourceStr | string = ''build() {Column() {Image(this.url).width('100%')}.width('100%').height('100%').backgroundColor(Color.Black).justifyContent(FlexAlign.Center).onClick(() => {this.controller.close()})}
}

与上一篇的不同之处就在于 这篇代码使用了半模态弹层  就是点击选择图片之后  弹窗是从底部弹起的 类似于ios那种效果

重点代码截图

需求4. HarmonyOs半模态bindsheet编写一个案例实现一个照片选择并可swiper滑动 并实现点那张展开就是哪张

import { GoodItem } from '../06/modules';@Entry
@Component
struct PhotoCasePage {@State message: string = '实现一个半模态相册';@State List: GoodItem[] = [{goods_name: 'dsfjlsjkfsf',goods_price: 100,goods_img: 'https://img1.baidu.com/it/u=1535232938,2370569369&fm=253&fmt=auto&app=120&f=JPEG?w=1280&h=800',goods_count: 1,id: 1},{goods_name: 'dfhlsdjflkdsjklfs 加速度的佛教山東i附件',goods_price: 200,goods_img: 'https://img1.baidu.com/it/u=2603934083,3021636721&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 2,id: 2},{goods_name: '收到回复技术大会哦恶化日发方大化工iu而韩国佛热',goods_price: 300,goods_img: 'https://img0.baidu.com/it/u=4289818793,3552718550&fm=253&fmt=auto&app=138&f=JPEG?w=889&h=500',goods_count: 3,id: 3}, {goods_name: '的時間佛薩飛機埃里克森放假哦i二fore多氟多化工i額方法過後i額外人',goods_price: 400,goods_img: 'https://img0.baidu.com/it/u=2080725050,2021436341&fm=253&fmt=auto&app=138&f=JPEG?w=1200&h=800',goods_count: 4,id: 4}, {goods_name: '时间佛ID分机构IE',goods_price: 500,goods_img: 'https://img1.baidu.com/it/u=4202924242,2178453218&fm=253&fmt=auto&app=120&f=JPEG?w=1422&h=800',goods_count: 5,id: 5}, {goods_name: '司法鉴定哦is叫哦私人',goods_price: 600,goods_img: 'https://10wallpaper.com/wallpaper/1680x1050/1405/Lavender_mountain_river-Landscape_HD_Wallpaper_1680x1050.jpg',goods_count: 6,id: 6}]@State isShowPhotoCom: boolean = false@State maxSelectNum: number = 4@State showSelectImgs: GoodItem[] = []@State selectImage: ResourceStr | string = ''@State setlectIndex: number = 0previw: CustomDialogController = new CustomDialogController({builder: PreviewDilog({ url: this.showSelectImgs, setlectIndex: this.setlectIndex, }),customStyle: true})@BuildersheetBuilder() {Column() {photoCom({List: this.List,isShowPhotoCom: this.isShowPhotoCom,maxSelectNum: this.maxSelectNum,showSelectImgs: this.showSelectImgs})}}build() {Column() {Button('选择图片').onClick(() => {this.isShowPhotoCom = true})Grid() {ForEach(this.showSelectImgs, (item: GoodItem, index: number) => {GridItem() {Image(item.goods_img).aspectRatio(1).onClick(() => {this.setlectIndex = indexthis.previw.open()})}})}.columnsTemplate('1fr 1fr').columnsGap(4).rowsGap(4)}.height('100%').width('100%').bindSheet($$this.isShowPhotoCom, this.sheetBuilder, {showClose: false})}
}// 选择图片组件
@Component
struct photoCom {@Prop List: GoodItem[] = []@Link isShowPhotoCom: boolean@State selectList: GoodItem[] = []@Prop maxSelectNum: number@Link showSelectImgs: GoodItem[]// 选择图片逻辑selectFn(item: GoodItem) {let Index = this.selectList.findIndex(obj => obj.id == item.id)console.log(JSON.stringify(Index))if (Index > -1) {this.selectList.splice(Index, 1)} else {this.selectList.push(item)}}build() {Column() {Grid() {ForEach(this.List, (item: GoodItem, index) => {GridItem() {Stack() {Image(item.goods_img).aspectRatio(1)if (this.selectList.some(obj => obj.id == item.id)) {Image($r('app.media.select')).width(60).height(60).fillColor(Color.Red)}}.onClick(() => {this.selectFn(item)})}})}.columnsTemplate('1fr 1fr').layoutWeight(1)// Text(`${}/${}`)Row() {Button('取消').onClick(() => {this.isShowPhotoCom = false})Text(`已选${this.selectList.length}张/最多选择${this.maxSelectNum}张`)Button('确认').onClick(() => {this.showSelectImgs = this.selectListthis.isShowPhotoCom = false})}.width('100%').height(60).justifyContent(FlexAlign.SpaceAround)}.width('100%').height('100%').backgroundColor(Color.White).justifyContent(FlexAlign.SpaceBetween)}
}// 查看图片的组件
@CustomDialog
struct PreviewDilog {controller: CustomDialogController = new CustomDialogController({ builder: CustomDialogController })url: GoodItem[] = []@Link setlectIndex: numberbuild() {Column() {Swiper() {ForEach(this.url, (item: GoodItem) => {Image(item.goods_img).width('100%')})}.loop(true).index($$this.setlectIndex)}.width('100%').height('100%').backgroundColor(Color.Black).justifyContent(FlexAlign.Center).onClick(() => {this.controller.close()})}
}

重点代码部分

注：传值发生了改变  在之前传值是传一张  然后再半模态显示出来  现在是传选中的那个数组  然后记录下点击的那个index   里边用swiper组件就可以了