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例えば、String <-> NSAttributedString

   1  @objc(S2ASTransformer) class
   2  S2ASTransformer	:	NSValueTransformer {
   3  
   4  	override static	func
   5  	transformedValueClass() -> AnyClass {
   6  		return NSAttributedString.self
   7  	}
   8  	override static	func
   9  	allowsReverseTransformation() -> Bool {
  10  		return true
  11  	}
  12  	override func
  13  	transformedValue( p: AnyObject? ) -> AnyObject {
  14  		if let w = p as? String { return NSAttributedString( string: w ) } else { return NSAttributedString() }
  15  	}
  16  	override func
  17  	reverseTransformedValue( p: AnyObject? ) -> AnyObject {
  18  		if let w = p as? NSAttributedString { return w.string } else { return "" }
  19  	}
  20  
  21  }
  22  

こんなの作ってこうやって登録

   1  	func
   2  	applicationDidFinishLaunching( p: NSNotification ) {
   3  		NSValueTransformer.setValueTransformer( S2ASTransformer(), forName: "S2ASTransformer" )
   4  	}
   5  	
   6  

posted by Face Saturn on Sat 26 Mar 2016 at 15:56
Contents
Value Transformer
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