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Interpolated Visual Constraint Language
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| // Example | |
| let blueView = UIView() | |
| blueView.backgroundColor = UIColor.blueColor() | |
| blueView.translatesAutoresizingMaskIntoConstraints = false | |
| let greenView = UIView() | |
| greenView.backgroundColor = UIColor.greenColor() | |
| greenView.translatesAutoresizingMaskIntoConstraints = false | |
| let redView = UIView() | |
| redView.backgroundColor = UIColor.redColor() | |
| redView.translatesAutoresizingMaskIntoConstraints = false | |
| view.addSubview(blueView) | |
| view.addSubview(greenView) | |
| view.addSubview(redView) | |
| let size = 60 | |
| view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-[\(blueView)(\(size))]-[\(redView)(==\(greenView))]-[\(greenView)(==\(redView))]-|")) | |
| view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[\(redView)(\(size))]-[\(greenView)(==\(blueView))]-[\(blueView)(==\(greenView))]-|")) | |
| // BAM! https://pbs.twimg.com/media/CIaWFfqUMAE307B.png:large | |
| // Implementation | |
| struct ConstraintBuilder : StringInterpolationConvertible { | |
| let format: String | |
| let metrics: [String : NSNumber] | |
| let views: [String : UIView] | |
| init(stringInterpolation strings: ConstraintBuilder...) { | |
| format = "".join(strings.map{ $0.format }) | |
| metrics = strings.map{ $0.metrics }.reduce([String : NSNumber]()){ $0 + $1 } | |
| views = strings.map{ $0.views }.reduce([String : UIView]()){ $0 + $1 } | |
| } | |
| init<T>(stringInterpolationSegment expr: T) { | |
| format = "\(expr)" | |
| metrics = [String : NSNumber]() | |
| views = [String : UIView]() | |
| } | |
| init(stringInterpolationSegment expr: UIView) { | |
| format = uniqueName(expr) | |
| metrics = [String : NSNumber]() | |
| views = [format : expr] | |
| } | |
| init(stringInterpolationSegment expr: NSNumber) { | |
| format = expr.stringValue | |
| metrics = [format : expr] | |
| views = [String : UIView]() | |
| } | |
| } | |
| extension NSLayoutConstraint { | |
| static func constraintsWithVisualFormat(builder: ConstraintBuilder, options: NSLayoutFormatOptions = []) -> [NSLayoutConstraint] { | |
| return constraintsWithVisualFormat(builder.format, options: options, metrics: builder.metrics, views: builder.views) | |
| } | |
| } | |
| // Helpers | |
| func memoryAddress(object: AnyObject) -> String { | |
| return Unmanaged.passUnretained(object).toOpaque().debugDescription | |
| } | |
| func uniqueName(object: AnyObject) -> String { | |
| return String(memoryAddress(object).characters.map { char in | |
| switch char { | |
| case "0": return "A" | |
| case "1": return "B" | |
| case "2": return "C" | |
| case "3": return "D" | |
| case "4": return "E" | |
| case "5": return "F" | |
| case "6": return "G" | |
| case "7": return "H" | |
| case "8": return "I" | |
| case "9": return "J" | |
| default: return char | |
| } | |
| }) | |
| } | |
| func +<K,V>(var lhs: Dictionary<K,V>, rhs: Dictionary<K,V>) -> Dictionary<K,V> { | |
| for (key, value) in rhs { | |
| lhs.updateValue(value, forKey: key) | |
| } | |
| return lhs | |
| } |
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