HarmonyOS Toggle开关状态控制

不可以，Toggle组件触发onChange事件是开关状态切换时触发该事件，所以状态是先改变的，参考示例如下：

@Entry
@Component
struct ToggleExample {
  @State isOn: boolean = false
  build() {
    Column({ space: 10 }) {
      Toggle({ type: ToggleType.Switch, isOn: $$this.isOn })
        .onChange((isOn: boolean) => {
          console.log(`Toggle is ${this.isOn ? 'ON' : 'OFF'})`)
          if (this.isOn === true) {
            this.isOn = isOn
            return;
          }

          AlertDialog.show(
            {
              title: 'title',
              subtitle: 'subtitle',
              message: 'text',
              autoCancel: true,
              alignment: DialogAlignment.Center,
              gridCount: 4,
              showInSubWindow: true,
              isModal: true,
              offset: { dx: 0, dy: -20 },
              buttonDirection: DialogButtonDirection.HORIZONTAL,
              buttons: [
                {
                  value: '取消',
                  action: () => {
                    this.isOn = true
                    console.info('取消关闭Toggle')
                  }
                },
                {
                  value: '确定',
                  action: () => {
                    this.isOn = isOn
                    console.info('确定关闭Toggle')
                  }
                }
              ],
              cancel: () => {
                this.isOn = true
                console.info('Closed callbacks')
              }
            })
        })
    }.width('100%')
  }
}