Nativescript BitmapFactory resize does not work in iOS - ios

Question

I am using the BitmapFactory plugin to rezize pictures to save them as thumnails
let mutable = BitmapFactory.makeMutable(imageSource);
let rotatedBitmap = BitmapFactory.asBitmap(mutable).dispose((bmp) =>
{
return bmp.resize("80,80");
});
in Android it works perfectly, but in iOS the image returned is not resized. I read in some issues that this is because the iOS uses the default scaling..?
does anybody knnow how to resize images to square thumbnaile with a given size ?
I use undermentioned function...
imageSource = imageSourceModule.fromFile(filepath);
try
{
var mutable = BitmapFactory.makeMutable(imageSource);
var ThumbBitmap = BitmapFactory.asBitmap(mutable).dispose((bmp) =>
{
var optisizestring = "25,25";
test = bmp.resize(optisizestring);
base64JPEG = test.toBase64(BitmapFactory.OutputFormat.JPEG, 75);
img = imageSource.fromBase64(base64JPEG);
resolve( "data:image/png;base64," + base64JPEG);
global.gc(); // tried with \ without garbage collection here
});
} catch(ex) { console.log("errds " + ex); resolve (null);}
(in the BitmapFactory-plugin) BitmapFactory.ios.js i changed the resize function
iOSImage.prototype._resize = function(newSize) {
var oldImg = this._nativeObject;
try {
var ns = CGSizeMake(newSize.width, newSize.height);
UIGraphicsBeginImageContext(ns);
var context = UIGraphicsGetCurrentContext();
oldImg.drawInRect(CGRectMake(0, 0,ns.width, ns.height));
return UIGraphicsGetImageFromCurrentImageContext();
}
finally
{
UIGraphicsEndImageContext();
}
};
// // [INTERNAL] _resize() Original
// iOSImage.prototype._resize = function(newSize) {
// var oldImg = this._nativeObject;
// try {
// var ns = CGSizeMake(newSize.width, newSize.height);
// UIGraphicsBeginImageContextWithOptions(ns, false, 0.0);
// oldImg.drawInRect(CGRectMake(0, 0,
// ns.width, ns.height));
// return new iOSImage(UIGraphicsGetImageFromCurrentImageContext());
// }
// finally {
// UIGraphicsEndImageContext();
// }
// };