Apple’s use of Swift and SwiftUI in iOS 17 by Timac:
"Objective-C is still at the core of iOS and is used directly or indirectly by most apps
The adoption of Swift and SwiftUI continues to grow rapidly
The share of Objective-C, C and C++ continues to decrease
"
It’s a must-read for the curious around here. https://blog.timac.org/2023/1019-state-of-swift-and-swiftui-ios17/