Miks iOS-i piltide vahemällu salvestamisel toimub esmalt UIImage konverteerimine Data-ks?

In iOS, when caching images, the conversion of UIImage to Data is often performed first for several reasons:

1. Versatility of storage: Data is a binary format that can be easily stored in the file system, database, or transmitted over the network. UIImage is a high-level object dependent on UIKit and cannot be stored directly.

2. Memory optimization: UIImage can contain raster data in the form of decoded images, which consumes a lot of RAM. Data stores compressed data (e.g., PNG or JPEG), saving space.

3. Image recovery: When needed, UIImage can be reconstructed from Data using initialization methods like UIImage(data:).

4. Cross-platform compatibility and portability: Data can be used with different APIs and caching systems, whereas UIImage is specific to iOS.

Conversion example:

if let image = UIImage(named: "example.png"),
   let imageData = image.pngData() {
    // Save imageData to cache
}

// When loading from cache
if let cachedData = ... { // get Data from cache
    let image = UIImage(data: cachedData)
}