Promise Example

DISCLAIMER: Did not test this code HAHAHA ask lang if ever naay error ;)

// Camera Service
onTakePhoto() {
    return new Promise((resolve, reject) => {
        requestPermissions().then(
            () =>  {
                // Other Codes Here
                takePicture(options)
                .then((imageAsset: any) => {
                        let source = new ImageSource();
                        source.fromAsset(imageAsset).then((source) => {
                            return resolve(source);
                        });
                    });
                }).catch(err => {
                    return reject(err);
                });
            },
            () => return reject(err);
        );
    });
}

// Component
this.priceListImage = imageSource;

this._cameraService.onTakePhoto().then((imageSource: ImageSource) => {
   this.priceListImage = imageSource; // <- the ImageAsset from Service ;)
   console.dir(this.priceListImage);
   //Research on how to use the ImageSource for e.g. Image src for displaying the image, get the path of the file, etc
}).catch(err => {
  // Do something here when there's an error
});