save array uiimage to user defaults in javascript

To save an array of UIImage objects to user defaults in JavaScript, you can first convert the array to an array of base64 encoded strings using the Canvas API. Then, you can save the resulting array to user defaults using localStorage

Here's an example function that saves an array of UIImages to user defaults:


index.tsx
function saveImagesToUserDefaults(images) {
  // Convert UIImage array to base64 encoded string array
  const base64Images = images.map((image) => {
    const canvas = document.createElement('canvas');
    canvas.width = image.width;
    canvas.height = image.height;

    const ctx = canvas.getContext('2d');
    ctx.drawImage(image, 0, 0, image.width, image.height);

    return canvas.toDataURL(); // returns base64 encoded string
  });

  // Save base64 encoded string array to user defaults
  localStorage.setItem('savedImages', JSON.stringify(base64Images));
}
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Then, you can call this function to save the array of images to user defaults:


index.tsx
const myImages = [UIImage1, UIImage2, UIImage3];
saveImagesToUserDefaults(myImages);
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Later when you need to retrieve the saved images, you can reverse the process:


index.tsx
function loadImagesFromUserDefaults() {
  // Get base64 encoded string array from user defaults
  const savedImages = localStorage.getItem('savedImages');
  if (!savedImages) {
    return [];
  }

  // Parse base64 encoded string array and convert back to UIImage array
  const base64Images = JSON.parse(savedImages);
  const images = base64Images.map((base64Image) => {
    const image = new Image();
    image.src = base64Image;
    return image;
  });

  return images;
}
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So calling loadImagesFromUserDefaults() will return the saved array of UIImage objects.

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