Keyboard not showing for search in nz-select

[nestoralonsovina]

Reproduction link

https://stackblitz.com/edit/angular-ovs1tk

Steps to reproduce

1. Opening Ng-zorro demo using safari in an iOS simulator
   2.In the example with the name "Select with search field"
2. Click on the select, you will see that it doesn't trigger the keyboard but it works on other examples where nzMode is not "default", with "multiple" or "tags" it works correctly

What is expected?

iOS keyboard should open on click

What is actually happening?

The keyboard is not showing up

Environment	Info
ng-zorro-antd	9.3.0
Browser	Safari 13

[WeslleyDeSouza]

any infos ?

[KwFung7]

Any update on this defect ?

[KwFung7]

I figure out a workaround, I simply remove "readonly" attribute in nz-select input element to fix this issue.

const inputEle = this.renderer.selectRootElement('nz-select nz-select-search input');
this.renderer.removeAttribute(inputEle , 'readonly');

[wenqi73]

Closed via #5953.