深入探索ArkUI中的@LocalBuilder装饰器：构建高效可维护的UI组件 原创

// 定义方式
@LocalBuilder 
MyBuilderFunction(param: ParamType) { 
    // 组件状态访问：this.stateVar
    // UI构建逻辑
}

// 调用方式
this.MyBuilderFunction(arg)
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@LocalBuilder
handleValueParam(param: string) {
    Text(`Value: ${param}`) // 获取的是参数快照值
}

// 使用示例
this.handleValueParam(this.stateVar)
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class RefParam {
    value: string = ''
}

@LocalBuilder
handleRefParam($$: RefParam) {
    Text(`Ref: ${$$.value}`) // 实时响应参数变化
}

// 使用示例
const refParam = new RefParam()
this.handleRefParam(refParam)
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// @LocalBuilder保持this指向
@LocalBuilder
localBuilderMethod() {
    Text(`${this.label}`) // 始终显示Parent组件的label
}

// @Builder改变this指向
@Builder
builderMethod() {
    Text(`${this.label}`) // 显示调用者组件的label
}
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@Component
struct ComplexComponent {
    @State privateData: string = 'secret'
    
    @LocalBuilder
    renderPrivateData() {
        if (this.privateData) {
            Text(`Data: ${this.privateData}`)
        }
    }
    
    build() {
        Column() {
            this.renderPrivateData()
            Button('Refresh').onClick(() => {
                this.privateData = 'new secret'
            })
        }
    }
}
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class UserProfile {
    @Trace name: string = ''
    @Trace avatar: string = ''
}

@Component
struct ProfileCard {
    @Require @Param user: UserProfile
    
    @LocalBuilder
    renderUserInfo($$: UserProfile) {
        Column() {
            Image($$.avatar).width(100).height(100)
            Text($$.name).fontSize(24)
        }
    }
    
    build() {
        this.renderUserInfo(this.user)
    }
}
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@Component
struct Dashboard {
    @LocalBuilder
    renderChart(data: ChartData) {
        LineChart({ data })
    }
    
    @LocalBuilder
    renderTable(records: Record[]) {
        DataTable({ records })
    }
    
    build() {
        Column() {
            this.renderChart(salesData)
            this.renderTable(userRecords)
        }
    }
}
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