SwiftUI: using RotationGesture with changeable blur effect - rotation

Question

I am trying to combine the RotationGesture with changeable blur effect. So if you turn the ocular right, you get the picture more sharp like in binoculars. Turn left, it will be blurred again. The code below is basically doing it, but not very smoothly. Have you any ideas to improve the effect?
struct ContentView: View {
#State var blurring: CGFloat = 20
#State var sharping: CGFloat = 0
#State private var rotateState: Double = 0
var body: some View {
ZStack {
Image("cat")
.resizable()
.frame(width: 200, height: 200)
.blur(radius: blurring)
.clipShape(Circle())
Image("ocular_rk2")
.resizable()
.frame(width: 350, height: 350)
.rotationEffect(Angle(degrees: self.rotateState))
.gesture(RotationGesture()
.onChanged { value in
self.rotateState = value.degrees
self.changeBlur()
}
.onEnded { value in
self.rotateState = value.degrees
print(self.rotateState)
}
)
}
}
func changeBlur() {
switch rotateState {
case -10000...10000: sharping = 0.1
default:
print("# Mistake in Switch")
}
if rotateState < 0 {
blurring += sharping
} else {
blurring -= sharping
}
}
}

Answer 1

check this out (i tested it, it works)
maybe you should think about changing some values because you have to rotate a while until you see the text.
by the way: it is always a good manner to post compilable reproducable code (we do not have your images)...
struct ContentView: View {
#State var blurring: CGFloat = 20
#State var sharping: CGFloat = 0
#State private var rotateState: Double = 0
var body: some View {
ZStack {
Text("cat")
// .resizable()
.frame(width: 200, height: 200)
.clipShape(Circle())
.background(Color.yellow)
Text("ocular_rk2")
// .resizable()
.blur(radius: blurring)
.frame(width: 350, height: 350)
.background(Color.red)
.rotationEffect(Angle(degrees: self.rotateState))
.gesture(RotationGesture()
.onChanged { value in
self.rotateState = value.degrees
self.changeBlur()
}
.onEnded { value in
self.rotateState = value.degrees
print(self.rotateState)
}
)
}
}
func changeBlur() {
switch rotateState {
case -10000...10000: sharping = 0.1
default:
print("# Mistake in Switch")
}
if rotateState < 0 {
blurring = blurring + sharping
} else {
blurring = blurring - sharping
print(blurring)
}
}
}