HarmonyOS 鸿蒙Next Dialog弹窗问题

可以参考如下demo：

[@CustomDialog](/user/CustomDialog)
export default struct ShareContent {
 controller: CustomDialogController = new CustomDialogController({
   builder: ShareContent({}),
 })
 sureClick?: ((str:string) => void)
 build() {
   Column() {
     Column(){

     }
     .width('100%').height(200)
     .border({
       width: { left: 2, right: 2, top: 2, bottom: 2 },
       color: Color.Black
     })
     .borderRadius(10)
     .backgroundColor('#fff')
     .margin({bottom:50})

     Column() {
       Button('取消').onClick(() => {
         this.controller.close()
       })
     }
     .width('100%')
   }
   .width('90%').backgroundColor(Color.Transparent)
 }
}
[@Entry](/user/Entry)
[@Component](/user/Component)
struct DialogPage {
 [@State](/user/State) message: string = '点我'
 dialogController: CustomDialogController = new CustomDialogController({
   builder: ShareContent({}),
   alignment: DialogAlignment.Center,
   customStyle: true
 })
 build() {
   Row() {
     Column() {
       Text(this.message)
         .fontSize(50)
         .fontWeight(FontWeight.Bold)
         .onClick(() => {
           this.dialogController.open()
         })
     }
     .width('100%')
   }
   .height('100%')
 }
}