Xcode 12 Can't figure out the type???

Question

Once again, the most frustrating and weird error message: "The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions"

Code Block struct TimePosition: View {
		var scale: Double
		var body: some View {
				GeometryReader { geometry in
						VStack {
								ForEach(0..<Int(geometry.size.height)/Int(1/self.scale), id:\.self) { y in
										Text(String(Double(y)/4.0)).position(x: geometry.size.width/2, y: CGFloat(y)).font(.system(size: 8.0)).foregroundColor(.gray)
								 }
						}
				}
		}
}

So, how exactly does one break this up?

2.3k

Posted by

hacksaw

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Answer 1

Really odd behavior.

Seems Text prefers String interpolation rather than String.init:

Code Block struct TimePosition: View {
    var scale: Double
    var body: some View {
        GeometryReader { geometry in
            VStack {
                ForEach(0..<Int(geometry.size.height)/Int(1/self.scale), id:\.self) { y in
                    Text("\(Double(y)/4.0)")
                        .position(x: geometry.size.width/2, y: CGFloat(y)).font(.system(size: 8.0))
                        .foregroundColor(.gray)
                }
            }
        }
    }
}

But I do not understand why type-checking an expression like Text(String(Double(y)/4.0)).position(x: geometry.size.width/2, y: CGFloat(y)).font(.system(size: 8.0)).foregroundColor(.gray) takes unreasonable time.

Posted by

OOPer

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Answer 2

Awesome, works for me. Reads slightly cleaner, too. But yeah, can't think why they are are different. I'd love to know... I think I'll ask on the Swift forums.

In any case, thanks!

Posted by

hacksaw

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Answer 3

Hi, could you file a bug report at https://feedbackassistant.apple.com with your test case to make sure we don't lose track of this?

Posted by

Developer Tools Engineer

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Answer 4

Filed: FB7802730

Posted by

hacksaw

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Xcode 12 Can't figure out the type???

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