This repository introduces SwiftUI's onHover modifier substitute View which is a wrapper of NSView.
- As of Swift 5.2 and Xcode 11.6 / 12.0 beta 4 targeting macOS 10.15.6, in certain circumstances, just attatching a
onHovermodifier triggers memory leak — preventingObservedObjectin a view to be deallocated. It seems like a bug. - The issue is disscussed here:
import SwiftUI
import HoverAwareView
struct ContentView: View {
@State private var opacity: Double = 1.0
var body: some View {
ZStack {
HoverAwareView { (hovering: Bool) in
withAnimation(Animation.spring()) {
self.opacity = hovering ? 0.5 : 1.0
}
}
Color.black.opacity(opacity)
}
}
}Or use View extension:
struct ContentView: View {
@State private var opacity: Double = 1.0
var body: some View {
Color.black.opacity(opacity).onHoverAware { (hovering: Bool) in
withAnimation(Animation.spring()) {
self.opacity = hovering ? 0.5 : 1.0
}
}
}
}MIT License
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