可以通过自定义tabBar的形式来做到。
demo如下：
// xxx.ets
import ComponentUtils from '[@ohos](/user/ohos).arkui.UIContext';
[@Entry](/user/Entry)
[@Component](/user/Component)
struct TabsExample {
[@State](/user/State) currentIndex: number = 0
[@State](/user/State) animationDuration: number = 300
[@State](/user/State) indicatorLeftMargin: number = 0
[@State](/user/State) indicatorWidth: number = 0
private tabsWidth: number = 0
private componentUtils: ComponentUtils.ComponentUtils = this.getUIContext().getComponentUtils()
[@Builder](/user/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%')
.backgroundImage($r('app.media.icon'))
.backgroundImageSize(ImageSize.Auto)
.backgroundImagePosition(Alignment.Center)
}
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 rectangle = this.componentUtils.getRectangleById(index.toString())
return { 'left': px2vp(rectangle.windowOffset.x), 'width': px2vp(rectangle.size.width) }
}
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
})
}
}
