Inappbrowser target _blank not opening in iOS

Ionic Native
1

In-app browser var target="_blank" not opening on IOS… it works perfectly on Android.
I have used Load start Event, load Starts event only works target="_blank".

 let target = '_blank'
    const browser = this.iab.create(this.url, target, this.options)
    browser.on("loadstart")
       .subscribe(
          event => {
            console.log("loadstop -->",event);
            console.log(event.url)
             let browser_url = event.url;

             if(browser_url.indexOf("qwertyerror_message") > -1){
                  let error_status = this.getParameterByName('qwertyerror_message',browser_url);
                  console.log('status',status)
                  browser.close();
                  this.toast.create(error_status);
            }
            console.log('browser url',browser_url)
          
             if(browser_url.indexOf("qwertysupmob_status") > -1){
                  this.pay_status = this.getParameterByName('qwertysupmob_status',browser_url);
                  console.log('status',this.pay_status)
                  if(status == "failure") {
                    browser.close();
                    this.navCtrl.push('PaymentStatusPage',{
                      payment_status: this.pay_status
                    });
                  }
             }
             if(browser_url.indexOf("qwertyorder") > -1){
                console.log('if qwertyorder');
                let order_id = this.getParameterByName('qwertyorder',browser_url);
                console.log('orderid',order_id);
                browser.close();
                this.navCtrl.push('PaymentStatusPage',{
                  payment_status: this.pay_status,
                  order_id: order_id,
                });
            }
          },
          err => {
            console.log("InAppBrowser loadstart Event Error: " + err);
       });

Please help me Soon Thanks Advance.