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Day 94: max() and min() confusion

Forums > 100 Days of SwiftUI

Hi everyone i just ended the challenges for Layout and Geometry and achieved the desire end result but got confused because even though i used max() and min() like Paul suggested us to use, I think they're not doing anything in the code. Maybe I'm missing something or the way I did the challenges kind of makes max() and min() not needed?

Code below:

GeometryReader { fullView in
            ScrollView(.vertical) {
                ForEach(0..<50) { index in
                    GeometryReader { geo in
                        Text("Row #\(index)")
                            .font(.title)
                            .frame(maxWidth: .infinity)
                            .background(Color(hue: min(geo.frame(in: .global).minY / fullView.frame(in: .global).maxY, 1.0), saturation: 1, brightness: 1))
                            .rotation3DEffect(.degrees(geo.frame(in: .global).minY - fullView.size.height / 2) / 5, axis: (x: 0, y: 1, z: 0))
                            .opacity(geo.frame(in: .global).minY / 200)
                            .scaleEffect(max(geo.frame(in: .global).minY / fullView.frame(in: .global).maxY + 0.5, 0.5))
                    }
                    .frame(height: 40)
                }
            }
        }

For example, in the scaleEffect modifier, the way I calculate the number, it will go from 1.0 to 0 + 0.5, so it will never go below half the size of the Text view, but Paul asked us to use max() there to prevent exactly that...

The same thing for the Color hue, i used the same logic, so it will go from 1.0 to 0 but Paul asked to use min() to prevent the number from going beyond 1.0.

I still used both min and max but I'm afraid I'm missing something and don't want to get through this challenges thinking I did the correct thing but in reality did wrong.

Thanks.

2      

what min and max did for me was to simplify my code. For example in challenge two Paul says not to go below 50%. I had this convoluted ternary code:

.scaleEffect((geo.frame(in: .global).origin.y / fullView.frame(in: .global).maxY * 2) < 0.5 ? 0.5 : geo.frame(in: .global).origin.y / fullView.frame(in: .global).maxY * 2)

and with max() I was able to simplfy to:

.scaleEffect(max(geo.frame(in: .global).origin.y / fullView.frame(in: .global).maxY * 2, 0.5))

and have the same effect. Does that help?

2      

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