Input automatically gets focus after entering the page. There is no problem in the computer simulation test, but it does not work on the mobile phone and the keyboard does not pop up.
I have basically tried all the online search methods, such as adding <preference name="KeyboardDisplayRequiresUserAction" value="false" />
to config.xml

Or add a delay, such as *.ts

@ViewChild('input') myInput: any;

ngAfterViewInit() {

    setTimeout(() => {
      console.log('focus')
      this.myInput.setFocus();
    }, 2000);

  }

*.html

<ion-input autofocus #input placeholder="input"></ion-input>

I don’t know if you have any other methods.
PS. The WeChat built-in browser and Safari used for the browser do not work. I have tried the WeChat built-in browser WKWebView and UIWebView and the kernel does not work either.