How to use ImagePicker to select image and display in Ionic Native - ionic-framework

Question

I'm developing an Ionic app, and one task is to select a profile via camera or gallery, and I use Ionic Native ImagePicker to select picture and crop, it can select and crop, but not display in front html page, my code is as below:
openImagePickerCrop(){
this.imagePicker.hasReadPermission().then(
(result) => {
if(result == false){
// no callbacks required as this opens a popup which returns async
this.imagePicker.requestReadPermission();
}
else if(result == true){
this.imagePicker.getPictures({
maximumImagesCount: 3
}).then(
(results) => {
for (var i = 0; i < results.length; i++) {
this.crop.crop(results[i], {quality: 100}).then(
newImage => {
this.imgResponse.push('data:image/jpeg;base64,' + newImage);
console.log("Image selected - " + newImage);
},
error => console.error("Error cropping image", error)
);
}
}, (err) => console.log(err)
);
}
}, (err) => {
console.log(err);
});
}
And this is my html code:
<ion-item class="input-item">
<ion-label position="floating">Photo</ion-label>
<div class='images' *ngFor="let img of imgResponse">
<img src="{{img}}" alt="" srcset="" />
</div>
<ion-card-content>
<ion-button color="medium" size="large" (click)="openImagePickerCrop()">
<ion-icon slot="icon-only" name="camera"></ion-icon>
</ion-button>
</ion-card-content>
</ion-item>
Where am I doing wrong, pls help.
Update:
To check if it's due to the crop function, I have updated functions as below:
openImagePicker(){
this.imagePicker.hasReadPermission().then(
(result) => {
if(result == false){
// no callbacks required as this opens a popup which returns async
this.imagePicker.requestReadPermission();
}
else if(result == true){
this.imagePicker.getPictures({
maximumImagesCount: 1
}).then(
(results) => {
for (var i = 0; i < results.length; i++) {
this.imgResponse.push('data:image/jpeg;base64,' + results[i]);
console.log("Image selected - " + results[i]);
}
}, (err) => console.log(err)
);
}
}, (err) => {
console.log(err);
});
}
But still not working, and the console doesn't capture anything.