Modal组件功能建议(open() and close() for Modal)

[spawpaw]

I'm submitting a...

[ ] Bug report  
[x] Feature request
[ ] Documentation issue or request
[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Support request => Please do not submit support request here

Current behavior

目前的modal组件只能通过中间变量开启和关闭,有些情景下很麻烦

<!--the current `nz-modal` component can only be open/closed by  intermediate variables-->
<button nz-button (click)="modal.nzVisible=true">
  <span>show modal</span>
</button>

<nz-modal #modal [nzTitle]="'喵喵喵'" [nzContent]="'汪!汪!汪!'"
          (nzOnCancel)="modal.nzVisible=false">
</nz-modal>

Expected behavior

如果有了open和close方法就方便很多(而且对原有的功能也没有任何影响)

<!-- by using the #modal var, now we can easily open/close the modal  -->
<button nz-button (click)="modal.open()">
  <span>show modal</span>
</button>

<nz-modal #modal [nzTitle]="'喵喵喵'" [nzContent]="'汪!汪!汪!'"
          (nzOnCancel)="modal.close()">
</nz-modal>

如果可以,还可以添加其他方法,如isOpen(),setLoading(boolean)等,这样在ts中只要添加一个ViewChild变量就可以了,而不是各种标识变量
current:

//too many vars make us confused(especially when you have many modals)
isXXXModalLoading=false;
isXXXModalOpen=false;

isYYYModalLoading=false;
isYYYModalOpen=false;

suppose to be:

//one var for all 
@ViewChild("modalA")
modalA;
@ViewChild("modalB")
modalB;

//use:
modalA.open()
modalA.setLoading(true)
modalA.setLoading(false)
modalA.close()

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