Using Autolayout Visual Format with Swift?

Question

I\'ve been trying to use the Autolayout Visual Format Language in Swift, using NSLayoutConstraint.constraintsWithVisualFormat. Here\'s an example of some code that

Answer 1

This works with Xcode 6.1.1:

extension NSView {

    func addConstraints(constraintsVFL: String, views: [String: NSView], metrics: [NSObject: AnyObject]? = nil, options: NSLayoutFormatOptions = NSLayoutFormatOptions.allZeros) {
        let mutableDict = (views as NSDictionary).mutableCopy() as NSMutableDictionary
        let constraints = NSLayoutConstraint.constraintsWithVisualFormat(constraintsVFL, options: options, metrics: metrics, views: mutableDict)
        self.addConstraints(constraints)
    }

}

Then you can use calls like:

var views : [String: NSView] = ["box": self.box]
self.view.addConstraints("V:[box(100)]", views: views)

This works to add constraints. If you are using iOS, substitute UIView for NSView

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You should probably check out

• Cartography, which is a new approach, but quite awesome. It uses Autolayout under the hood.
• SnapKit, which I haven't tried but is also a DSL autolayout framework