Using a constant

[mwhuss]

I'm trying to use a constant to specify how much of a margin i want to use.

let margin = 10.0

label.top == label.superview!.top + margin

I can't get this to work no matter how I cast margin. Am I missing something?

[robb]

What error are you getting?

Have you tried casting to CGFloat?

[mwhuss]

let margin = 10.0
view.top == view.superview!.top + margin`

Results in:

Cannot invoke '==' with an argument list of type '(Edge, $T9)'

view.top == view.superview!.top + CGFloat(margin)

Results in:

Cannot invoke '+' with an argument list of type '(Edge, $T11)'

[robb]

Hmm, it's not affected by #9, is it?

[mwhuss]

No, it happens in multiple line blocks as well. Let me know if you'd like
an example project.

[robb]

That would be great

[mwhuss]

Here you go https://dl.dropboxusercontent.com/u/14393/CartographyConstants.zip

[robb]

Ah, dang, you have to cast to Float, not CGFloat. This works for me

let margin = 20.0 as Float

layout(label) { label in
    label.left == label.superview!.left + margin
    label.right == label.superview!.right - margin
}

(sorry for the late reply)

[mwhuss]

Ah great, thanks!