Ionic v4 - 如何在输入上自动对焦？

Question

我有一个输入<ion-input #codigobarras></ion-input>的视图

如何自动关注此输入？

What have I tried

@ViewChild('codigobarras') input_codigobarras: Input;

...

ionViewDidEnter() {
    this.input_codigobarras.focus(); // didn't work = temp2.focus is not a function
    this.input_codigobarras.focus.emit(); // didn't work = do nothing, just returns undefined
    this.input_codigobarras.getElementRef().nativeElement.focus() // didn't work = do nothing, just returns undefined
    this.input_codigobarras.setFocus(); // didn't work = do nothing, just returns undefined
}

<ion-input [autofocus]></ion-input> <!-- Didn't wrok -->

Answer 1

这应该工作

<ion-input autofocus="true"></ion-input>

Answer 2

加载项目后，您可以尝试使用ngOnChanges（）触发ElementRef

 @ViewChild('test') test: ElementRef;

 ngOnChanges(changes: SimpleChanges){
     if(changes.items) {
     this.test.nativeElement.firstChild['autofocus'] = 'true';
   }
}

和你的HTML

<div #test>
  <ion-input ></ion-input>
</div>