100 Days of SwiftUI

Day 65

2026-07-18

Project 13, part 4

Starting work on the actual app

Building our basic UI

• basic layout
• practice moving “work” out of the view and into methods/funcs

Importing an image into SwiftUI using PhotosPicker

• PhotosPicker is built in, but does need some effort to make it work
• Swift Images are Images, but filters etc want DATA

Basic image filtering using Core Image

• Not everything can be done directly in SwiftUI, so knowing how to use “older” frameworks is helpful
• CGImage, CIImage, UIImage, SwiftUI Image — all are needed to display a modified/modifiable image in iOS

Core Image filters have a dedicated inputImage property that lets us send in a CIImage for the filter to work with, but often this is thoroughly broken and will cause your app to crash — it’s much safer to use the filter’s setValue() method with the key kCIInputImageKey.