鸿蒙Harmony应用开发—ArkTS声明式开发（容器组件：Tabs）

通过页签进行内容视图切换的容器组件，每个页签对应一个内容视图。

说明：

该组件从API Version 7开始支持。后续版本如有新增内容，则采用上角标单独标记该内容的起始版本。

该组件从API Version 11开始默认支持安全区避让特性(默认值为：expandSafeArea([SafeAreaType.SYSTEM], [SafeAreaEdge.BOTTOM]))，开发者可以重写该属性覆盖默认行为，API Version 11之前的版本需配合expandSafeArea属性实现安全区避让。

子组件

仅可包含子组件TabContent。

说明：

Tabs子组件的visibility属性设置为None，或者visibility属性设置为Hidden时，对应子组件不显示，但依然会在视窗内占位。

接口

Tabs(value?: {barPosition?: BarPosition, index?: number, controller?: TabsController})

参数：

BarPosition枚举说明

属性

除支持通用属性外，还支持以下属性：

DividerStyle10+对象说明

BarGridColumnOptions10+对象说明

ScrollableBarModeOptions10+对象说明

BarMode枚举说明

LayoutStyle10+枚举说明

事件

除支持通用事件外，还支持以下事件：

TabsController

Tabs组件的控制器，用于控制Tabs组件进行页签切换。不支持一个TabsController控制多个Tabs组件。

导入对象

let controller: TabsController = new TabsController()

changeIndex

changeIndex(value: number): void

控制Tabs切换到指定页签。

参数：

示例

示例1

本示例通过onChange实现切换时自定义tabBar和TabContent的联动。

// xxx.ets
@Entry
@Component
struct TabsExample {
  @State fontColor: string = '#182431'
  @State selectedFontColor: string = '#007DFF'
  @State currentIndex: number = 0
  private controller: TabsController = new TabsController()
 
  @Builder tabBuilder(index: number, name: string) {
    Column() {
      Text(name)
        .fontColor(this.currentIndex === index ? this.selectedFontColor : this.fontColor)
        .fontSize(16)
        .fontWeight(this.currentIndex === index ? 500 : 400)
        .lineHeight(22)
        .margin({ top: 17, bottom: 7 })
      Divider()
        .strokeWidth(2)
        .color('#007DFF')
        .opacity(this.currentIndex === index ? 1 : 0)
    }.width('100%')
  }
 
  build() {
    Column() {
      Tabs({ barPosition: BarPosition.Start, index: this.currentIndex, controller: this.controller }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#00CB87')
        }.tabBar(this.tabBuilder(0, 'green'))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#007DFF')
        }.tabBar(this.tabBuilder(1, 'blue'))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#FFBF00')
        }.tabBar(this.tabBuilder(2, 'yellow'))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#E67C92')
        }.tabBar(this.tabBuilder(3, 'pink'))
      }
      .vertical(false)
      .barMode(BarMode.Fixed)
      .barWidth(360)
      .barHeight(56)
      .animationDuration(400)
      .onChange((index: number) => {
        this.currentIndex = index
      })
      .width(360)
      .height(296)
      .margin({ top: 52 })
      .backgroundColor('#F1F3F5')
    }.width('100%')
  }
}

示例2

本示例通过divider实现了分割线各种属性的展示。

// xxx.ets
@Entry
@Component
struct TabsDivider1 {
  private controller1: TabsController = new TabsController()
  @State dividerColor: string = 'red'
  @State strokeWidth: number = 2
  @State startMargin: number = 0
  @State endMargin: number = 0
  @State nullFlag: boolean = false
 
  build() {
    Column() {
      Tabs({ controller: this.controller1 }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Pink)
        }.tabBar('pink')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Yellow)
        }.tabBar('yellow')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Blue)
        }.tabBar('blue')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Red)
        }.tabBar('red')
      }
      .vertical(true)
      .scrollable(true)
      .barMode(BarMode.Fixed)
      .barWidth(70)
      .barHeight(200)
      .animationDuration(400)
      .onChange((index: number) => {
        console.info(index.toString())
      })
      .height('200vp')
      .margin({ bottom: '12vp' })
      .divider(this.nullFlag ? null : {
        strokeWidth: this.strokeWidth,
        color: this.dividerColor,
        startMargin: this.startMargin,
        endMargin: this.endMargin
      })
 
      Button('常规Divider').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          this.nullFlag = false;
          this.strokeWidth = 2;
          this.dividerColor = 'red';
          this.startMargin = 0;
          this.endMargin = 0;
        })
      Button('空Divider').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          this.nullFlag = true
        })
      Button('颜色变为蓝色').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          this.dividerColor = 'blue'
        })
      Button('宽度增加').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          this.strokeWidth += 2
        })
      Button('宽度减小').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          if (this.strokeWidth > 2) {
            this.strokeWidth -= 2
          }
        })
      Button('上边距增加').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          this.startMargin += 2
        })
      Button('上边距减少').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          if (this.startMargin > 2) {
            this.startMargin -= 2
          }
        })
      Button('下边距增加').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          this.endMargin += 2
        })
      Button('下边距减少').width('100%').margin({ bottom: '12vp' })
        .onClick(() => {
          if (this.endMargin > 2) {
            this.endMargin -= 2
          }
        })
    }.padding({ top: '24vp', left: '24vp', right: '24vp' })
  }
}

示例3

本示例通过fadingEdge实现了切换子页签渐隐和不渐隐。

// xxx.ets
@Entry
@Component
struct TabsOpaque {
  @State message: string = 'Hello World'
  private controller: TabsController = new TabsController()
  private controller1: TabsController = new TabsController()
  @State selfFadingFade: boolean = true;
 
  build() {
    Column() {
      Button('子页签设置渐隐').width('100%').margin({ bottom: '12vp' })
        .onClick((event?: ClickEvent) => {
          this.selfFadingFade = true;
        })
      Button('子页签设置不渐隐').width('100%').margin({ bottom: '12vp' })
        .onClick((event?: ClickEvent) => {
          this.selfFadingFade = false;
        })
      Tabs({ barPosition: BarPosition.End, controller: this.controller }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Pink)
        }.tabBar('pink')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Yellow)
        }.tabBar('yellow')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Blue)
        }.tabBar('blue')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
      }
      .vertical(false)
      .scrollable(true)
      .barMode(BarMode.Scrollable)
      .barHeight(80)
      .animationDuration(400)
      .onChange((index: number) => {
        console.info(index.toString())
      })
      .fadingEdge(this.selfFadingFade)
      .height('30%')
      .width('100%')
 
      Tabs({ barPosition: BarPosition.Start, controller: this.controller1 }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Pink)
        }.tabBar('pink')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Yellow)
        }.tabBar('yellow')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Blue)
        }.tabBar('blue')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar('green')
      }
      .vertical(true)
      .scrollable(true)
      .barMode(BarMode.Scrollable)
      .barHeight(200)
      .barWidth(80)
      .animationDuration(400)
      .onChange((index: number) => {
        console.info(index.toString())
      })
      .fadingEdge(this.selfFadingFade)
      .height('30%')
      .width('100%')
    }
    .padding({ top: '24vp', left: '24vp', right: '24vp' })
  }
}

示例4

本示例通过barOverlap实现了TabBar是否背后变模糊并叠加在TabContent之上。

// xxx.ets
@Entry
@Component
struct barBackgroundColorTest {
  private controller: TabsController = new TabsController()
  @State barOverlap: boolean = true;
  @State barBackgroundColor: string = '#88888888';
 
  build() {
    Column() {
      Button("barOverlap变化").width('100%').margin({ bottom: '12vp' })
        .onClick((event?: ClickEvent) => {
          if (this.barOverlap) {
            this.barOverlap = false;
          } else {
            this.barOverlap = true;
          }
        })
 
      Tabs({ barPosition: BarPosition.Start, index: 0, controller: this.controller }) {
        TabContent() {
          Column() {
            Text(`barOverlap ${this.barOverlap}`).fontSize(16).margin({ top: this.barOverlap ? '56vp' : 0 })
            Text(`barBackgroundColor ${this.barBackgroundColor}`).fontSize(16)
          }.width('100%').width('100%').height('100%')
          .backgroundColor(Color.Pink)
        }
        .tabBar(new BottomTabBarStyle($r('sys.media.ohos_app_icon'), "1"))
 
        TabContent() {
          Column() {
            Text(`barOverlap ${this.barOverlap}`).fontSize(16).margin({ top: this.barOverlap ? '56vp' : 0 })
            Text(`barBackgroundColor ${this.barBackgroundColor}`).fontSize(16)
          }.width('100%').width('100%').height('100%')
          .backgroundColor(Color.Yellow)
        }
        .tabBar(new BottomTabBarStyle($r('sys.media.ohos_app_icon'), "2"))
 
        TabContent() {
          Column() {
            Text(`barOverlap ${this.barOverlap}`).fontSize(16).margin({ top: this.barOverlap ? '56vp' : 0 })
            Text(`barBackgroundColor ${this.barBackgroundColor}`).fontSize(16)
          }.width('100%').width('100%').height('100%')
          .backgroundColor(Color.Green)
        }
        .tabBar(new BottomTabBarStyle($r('sys.media.ohos_app_icon'), "3"))
      }
      .vertical(false)
      .barMode(BarMode.Fixed)
      .height('60%')
      .barOverlap(this.barOverlap)
      .scrollable(true)
      .animationDuration(10)
      .barBackgroundColor(this.barBackgroundColor)
    }
    .height(500)
    .padding({ top: '24vp', left: '24vp', right: '24vp' })
  }
}

示例5

本示例通过barGridAlign实现了以栅格化方式设置TabBar的可见区域。

// xxx.ets
@Entry
@Component
struct TabsExample5 {
  private controller: TabsController = new TabsController()
  @State gridMargin: number = 10
  @State gridGutter: number = 10
  @State sm: number = -2
  @State clickedContent: string = "";
 
  build() {
    Column() {
      Row() {
        Button("gridMargin+10 " + this.gridMargin)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.gridMargin += 10
          })
          .margin({ right: '6%', bottom: '12vp' })
        Button("gridMargin-10 " + this.gridMargin)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.gridMargin -= 10
          })
          .margin({ bottom: '12vp' })
      }
 
      Row() {
        Button("gridGutter+10 " + this.gridGutter)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.gridGutter += 10
          })
          .margin({ right: '6%', bottom: '12vp' })
        Button("gridGutter-10 " + this.gridGutter)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.gridGutter -= 10
          })
          .margin({ bottom: '12vp' })
      }
 
      Row() {
        Button("sm+2 " + this.sm)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.sm += 2
          })
          .margin({ right: '6%' })
        Button("sm-2 " + this.sm).width('47%').height(50).margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.sm -= 2
          })
      }
 
      Text("点击内容:" + this.clickedContent).width('100%').height(200).margin({ top: 5 })
 
 
      Tabs({ barPosition: BarPosition.End, controller: this.controller }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Pink)
        }.tabBar(BottomTabBarStyle.of($r("sys.media.ohos_app_icon"), "1"))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar(BottomTabBarStyle.of($r("sys.media.ohos_app_icon"), "2"))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Blue)
        }.tabBar(BottomTabBarStyle.of($r("sys.media.ohos_app_icon"), "3"))
      }
      .width('350vp')
      .animationDuration(300)
      .height('60%')
      .barGridAlign({ sm: this.sm, margin: this.gridMargin, gutter: this.gridGutter })
      .backgroundColor(0xf1f3f5)
      .onTabBarClick((index: number) => {
        this.clickedContent += "now index " + index + " is clicked\n";
      })
    }
    .width('100%')
    .height(500)
    .margin({ top: 5 })
    .padding('10vp')
  }
}

示例6

本示例实现了barMode的ScrollableBarModeOptions参数，该参数仅在Scrollable模式下有效。

// xxx.ets
@Entry
@Component
struct TabsExample6 {
  private controller: TabsController = new TabsController()
  @State scrollMargin: number = 0
  @State layoutStyle: LayoutStyle = LayoutStyle.ALWAYS_CENTER
  @State text: string = "文本"
 
  build() {
    Column() {
      Row() {
        Button("scrollMargin+10 " + this.scrollMargin)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.scrollMargin += 10
          })
          .margin({ right: '6%', bottom: '12vp' })
        Button("scrollMargin-10 " + this.scrollMargin)
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.scrollMargin -= 10
          })
          .margin({ bottom: '12vp' })
      }
 
      Row() {
        Button("文本增加 ")
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.text += '文本增加'
          })
          .margin({ right: '6%', bottom: '12vp' })
        Button("文本重置")
          .width('47%')
          .height(50)
          .margin({ top: 5 })
          .onClick((event?: ClickEvent) => {
            this.text = "文本"
          })
          .margin({ bottom: '12vp' })
      }
 
      Row() {
        Button("layoutStyle.ALWAYS_CENTER")
          .width('100%')
          .height(50)
          .margin({ top: 5 })
          .fontSize(15)
          .onClick((event?: ClickEvent) => {
            this.layoutStyle = LayoutStyle.ALWAYS_CENTER;
          })
          .margin({ bottom: '12vp' })
      }
 
      Row() {
        Button("layoutStyle.ALWAYS_AVERAGE_SPLIT")
          .width('100%')
          .height(50)
          .margin({ top: 5 })
          .fontSize(15)
          .onClick((event?: ClickEvent) => {
            this.layoutStyle = LayoutStyle.ALWAYS_AVERAGE_SPLIT;
          })
          .margin({ bottom: '12vp' })
      }
 
      Row() {
        Button("layoutStyle.SPACE_BETWEEN_OR_CENTER")
          .width('100%')
          .height(50)
          .margin({ top: 5 })
          .fontSize(15)
          .onClick((event?: ClickEvent) => {
            this.layoutStyle = LayoutStyle.SPACE_BETWEEN_OR_CENTER;
          })
          .margin({ bottom: '12vp' })
      }
 
      Tabs({ barPosition: BarPosition.End, controller: this.controller }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Pink)
        }.tabBar(SubTabBarStyle.of(this.text))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Green)
        }.tabBar(SubTabBarStyle.of(this.text))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor(Color.Blue)
        }.tabBar(SubTabBarStyle.of(this.text))
      }
      .animationDuration(300)
      .height('60%')
      .backgroundColor(0xf1f3f5)
      .barMode(BarMode.Scrollable, { margin: this.scrollMargin, nonScrollableLayoutStyle: this.layoutStyle })
    }
    .width('100%')
    .height(500)
    .margin({ top: 5 })
    .padding('24vp')
  }
}

示例7

本示例通过customContentTransition实现了自定义Tabs页面的切换动画。

// xxx.ets
@Entry
@Component
struct TabsCustomAnimationExample {
  @State useCustomAnimation: boolean = true
  @State tabContent0Scale: number = 1.0
  @State tabContent1Scale: number = 1.0
  @State tabContent0Opacity: number = 1.0
  @State tabContent1Opacity: number = 1.0
  @State tabContent2Opacity: number = 1.0
  tabsController: TabsController = new TabsController()
  private firstTimeout: number = 3000
  private secondTimeout: number = 5000
  private first2secondDuration: number = 3000
  private second2thirdDuration: number = 5000
  private first2thirdDuration: number = 2000
  private baseCustomAnimation: (from: number, to: number) => TabContentAnimatedTransition = (from: number, to: number) => {
    if ((from === 0 && to === 1) || (from === 1 && to === 0)) {
      // 缩放动画
      let firstCustomTransition = {
        timeout: this.firstTimeout,
        transition: (proxy: TabContentTransitionProxy) => {
          if (proxy.from === 0 && proxy.to === 1) {
            this.tabContent0Scale = 1.0
            this.tabContent1Scale = 0.5
          } else {
            this.tabContent0Scale = 0.5
            this.tabContent1Scale = 1.0
          }
 
          animateTo({
            duration: this.first2secondDuration,
            onFinish: () => {
              proxy.finishTransition()
            }
          }, () => {
            if (proxy.from === 0 && proxy.to === 1) {
              this.tabContent0Scale = 0.5
              this.tabContent1Scale = 1.0
            } else {
              this.tabContent0Scale = 1.0
              this.tabContent1Scale = 0.5
            }
          })
        }
      } as TabContentAnimatedTransition;
      return firstCustomTransition;
    } else {
      // 透明度动画
      let secondCustomTransition = {
        timeout: this.secondTimeout,
        transition: (proxy: TabContentTransitionProxy) => {
          if ((proxy.from === 1 && proxy.to === 2) || (proxy.from === 2 && proxy.to === 1)) {
            if (proxy.from === 1 && proxy.to === 2) {
              this.tabContent1Opacity = 1.0
              this.tabContent2Opacity = 0.5
            } else {
              this.tabContent1Opacity = 0.5
              this.tabContent2Opacity = 1.0
            }
            animateTo({
              duration: this.second2thirdDuration,
              onFinish: () => {
                proxy.finishTransition()
              }
            }, () => {
              if (proxy.from === 1 && proxy.to === 2) {
                this.tabContent1Opacity = 0.5
                this.tabContent2Opacity = 1.0
              } else {
                this.tabContent1Opacity = 1.0
                this.tabContent2Opacity = 0.5
              }
            })
          } else if ((proxy.from === 0 && proxy.to === 2) || (proxy.from === 2 && proxy.to === 0)) {
            if (proxy.from === 0 && proxy.to === 2) {
              this.tabContent0Opacity = 1.0
              this.tabContent2Opacity = 0.5
            } else {
              this.tabContent0Opacity = 0.5
              this.tabContent2Opacity = 1.0
            }
            animateTo({
              duration: this.first2thirdDuration,
              onFinish: () => {
                proxy.finishTransition()
              }
            }, () => {
              if (proxy.from === 0 && proxy.to === 2) {
                this.tabContent0Opacity = 0.5
                this.tabContent2Opacity = 1.0
              } else {
                this.tabContent0Opacity = 1.0
                this.tabContent2Opacity = 0.5
              }
            })
          }
        }
      } as TabContentAnimatedTransition;
      return secondCustomTransition;
    }
  }
 
  build() {
    Column() {
      Tabs({ controller: this.tabsController }) {
        TabContent() {
          Text("Red")
        }
        .tabBar("Red")
        .scale({ x: this.tabContent0Scale, y: this.tabContent0Scale })
        .backgroundColor(Color.Red)
        .opacity(this.tabContent0Opacity)
        .width(100)
        .height(100)
 
        TabContent() {
          Text("Yellow")
        }
        .tabBar("Yellow")
        .scale({ x: this.tabContent1Scale, y: this.tabContent1Scale })
        .backgroundColor(Color.Yellow)
        .opacity(this.tabContent1Opacity)
        .width(200)
        .height(200)
 
        TabContent() {
          Text("Blue")
        }
        .tabBar("Blue")
        .backgroundColor(Color.Blue)
        .opacity(this.tabContent2Opacity)
        .width(300)
        .height(300)
 
      }
      .backgroundColor(0xf1f3f5)
      .width('100%')
      .height(500)
      .margin({ top: 5 })
      .customContentTransition(this.useCustomAnimation ? this.baseCustomAnimation : undefined)
      .barMode(BarMode.Scrollable)
      .onChange((index: number) => {
        console.info("onChange index: " + index)
      })
      .onTabBarClick((index: number) => {
        console.info("onTabBarClick index: " + index)
      })
    }
  }
}

示例8

本示例通过onChange、onAnimationStart、onAnimationEnd、onGestureSwipe等接口实现了自定义TabBar的切换动画。

// xxx.ets
@Entry
@Component
struct TabsExample {
  @State currentIndex: number = 0
  @State animationDuration: number = 300
  @State indicatorLeftMargin: number = 0
  @State indicatorWidth: number = 0
  private tabsWidth: number = 0
 
  @Builder
  tabBuilder(index: number, name: string) {
    Column() {
      Text(name)
        .fontSize(16)
        .fontColor(this.currentIndex === index ? '#007DFF' : '#182431')
        .fontWeight(this.currentIndex === index ? 500 : 400)
        .id(index.toString())
        .onAreaChange((oldValue: Area,newValue: Area) => {
          if (this.currentIndex === index && (this.indicatorLeftMargin === 0 || this.indicatorWidth === 0)){
            if (newValue.position.x != undefined) {
              let positionX = Number.parseFloat(newValue.position.x.toString())
              this.indicatorLeftMargin = Number.isNaN(positionX) ? 0 : positionX
            }
            let width = Number.parseFloat(newValue.width.toString())
            this.indicatorWidth = Number.isNaN(width) ? 0 : width
          }
        })
    }.width('100%')
  }
 
  build() {
    Stack({ alignContent: Alignment.TopStart }) {
      Tabs({ barPosition: BarPosition.Start }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#00CB87')
        }.tabBar(this.tabBuilder(0, 'green'))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#007DFF')
        }.tabBar(this.tabBuilder(1, 'blue'))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#FFBF00')
        }.tabBar(this.tabBuilder(2, 'yellow'))
 
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#E67C92')
        }.tabBar(this.tabBuilder(3, 'pink'))
      }
      .onAreaChange((oldValue: Area,newValue: Area)=> {
        let width = Number.parseFloat(newValue.width.toString())
        this.tabsWidth = Number.isNaN(width) ? 0 : width
      })
      .barWidth('100%')
      .barHeight(56)
      .width('100%')
      .height(296)
      .backgroundColor('#F1F3F5')
      .animationDuration(this.animationDuration)
      .onChange((index: number) => {
        this.currentIndex = index  // 监听索引index的变化，实现页签内容的切换。
      })
      .onAnimationStart((index: number, targetIndex: number, event: TabsAnimationEvent) => {
        // 切换动画开始时触发该回调。下划线跟着页面一起滑动，同时宽度渐变。
        this.currentIndex = targetIndex
        let targetIndexInfo = this.getTextInfo(targetIndex)
        this.startAnimateTo(this.animationDuration, targetIndexInfo.left, targetIndexInfo.width)
      })
      .onAnimationEnd((index: number,event: TabsAnimationEvent) => {
        // 切换动画结束时触发该回调。下划线动画停止。
        let currentIndicatorInfo = this.getCurrentIndicatorInfo(index,event)
        this.startAnimateTo(0,currentIndicatorInfo.left,currentIndicatorInfo.width)
      })
      .onGestureSwipe((index: number,event: TabsAnimationEvent) => {
        // 在页面跟手滑动过程中，逐帧触发该回调。
        let currentIndicatorInfo = this.getCurrentIndicatorInfo(index,event)
        this.currentIndex = currentIndicatorInfo.index
        this.indicatorLeftMargin = currentIndicatorInfo.left
        this.indicatorWidth = currentIndicatorInfo.width
      })
 
      Column()
        .height(2)
        .width(this.indicatorWidth)
        .margin({ left: this.indicatorLeftMargin, top:48})
        .backgroundColor('#007DFF')
    }.width('100%')
  }
 
  private getTextInfo(index: number): Record<string, number> {
    let strJson = getInspectorByKey(index.toString())
    try {
      let obj: Record<string, string> = JSON.parse(strJson)
      let rectInfo: number[][] = JSON.parse('[' + obj.$rect + ']')
      return { 'left': px2vp(rectInfo[0][0]), 'width': px2vp(rectInfo[1][0] - rectInfo[0][0]) }
    } catch (error) {
      return { 'left': 0, 'width': 0 }
    }
  }
 
  private getCurrentIndicatorInfo(index: number, event: TabsAnimationEvent): Record<string, number> {
    let nextIndex = index
    if (index > 0 && event.currentOffset > 0) {
      nextIndex--
    } else if (index < 3 && event.currentOffset < 0) {
      nextIndex++
    }
    let indexInfo = this.getTextInfo(index)
    let nextIndexInfo = this.getTextInfo(nextIndex)
    let swipeRatio = Math.abs(event.currentOffset / this.tabsWidth)
    let currentIndex = swipeRatio > 0.5 ? nextIndex : index  // 页面滑动超过一半，tabBar切换到下一页。
    let currentLeft = indexInfo.left + (nextIndexInfo.left - indexInfo.left) * swipeRatio
    let currentWidth = indexInfo.width + (nextIndexInfo.width - indexInfo.width) * swipeRatio
    return { 'index': currentIndex, 'left': currentLeft, 'width': currentWidth }
  }
 
  private startAnimateTo(duration: number, leftMargin: number, width: number) {
    animateTo({
      duration: duration, // 动画时长
      curve: Curve.Linear, // 动画曲线
      iterations: 1, // 播放次数
      playMode: PlayMode.Normal, // 动画模式
      onFinish: () => {
        console.info('play end')
      }
    }, () => {
      this.indicatorLeftMargin = leftMargin
      this.indicatorWidth = width
    })
  }
}

最后，有很多小伙伴不知道学习哪些鸿蒙开发技术？不知道需要重点掌握哪些鸿蒙应用开发知识点？而且学习时频繁踩坑，最终浪费大量时间。所以有一份实用的鸿蒙（HarmonyOS NEXT）资料用来跟着学习是非常有必要的。 

这份鸿蒙（HarmonyOS NEXT）资料包含了鸿蒙开发必掌握的核心知识要点，内容包含了（ArkTS、ArkUI开发组件、Stage模型、多端部署、分布式应用开发、音频、视频、WebGL、OpenHarmony多媒体技术、Napi组件、OpenHarmony内核、Harmony南向开发、鸿蒙项目实战等等）鸿蒙（HarmonyOS NEXT）技术知识点。

希望这一份鸿蒙学习资料能够给大家带来帮助，有需要的小伙伴自行领取，限时开源，先到先得~无套路领取！！

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鸿蒙（HarmonyOS NEXT）最新学习路线

•  HarmonOS基础技能

• HarmonOS就业必备技能 
•  HarmonOS多媒体技术

• 鸿蒙NaPi组件进阶

• HarmonOS高级技能

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有了路线图，怎么能没有学习资料呢，小编也准备了一份联合鸿蒙官方发布笔记整理收纳的一套系统性的鸿蒙（OpenHarmony ）学习手册（共计1236页）与鸿蒙（OpenHarmony ）开发入门教学视频，内容包含：ArkTS、ArkUI、Web开发、应用模型、资源分类…等知识点。

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OpenHarmony北向、南向开发环境搭建

 《鸿蒙开发基础》

• ArkTS语言
• 安装DevEco Studio
• 运用你的第一个ArkTS应用
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• .……

 《鸿蒙开发进阶》

• Stage模型入门
• 网络管理
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• 通知与窗口管理
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• 安全技能
• 任务管理
• WebGL
• 国际化开发
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• 鸿蒙系统移植和裁剪定制
• ……

《鸿蒙进阶实战》

• ArkTS实践
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总结

总的来说，华为鸿蒙不再兼容安卓，对中年程序员来说是一个挑战，也是一个机会。只有积极应对变化，不断学习和提升自己，他们才能在这个变革的时代中立于不败之地。