Configuring CIFilter in Swift

Question

How to translate the last line of the following ObjC code in Swift:

CGAffineTransform transform = CGAffineTransformIdentity; CIFilter *clampFilter = [CIFilter filterWithName:@"CIAffineClamp"]; [clampFilter setValue:[NSValue valueWithBytes:&transform objCType:@encode(CGAffineTransform)] forKey:@"inputTransform"]; 

Next line

 clampFilter.setValue(transform, forKey: "inputTransform") 

produces

 Type 'CGAffineTransform' does not conform to protocol 'AnyObject' 

Answer 1

NSValue has a constructor that takes a CGAffineTransform argument:

 let transform = CGAffineTransformIdentity let clampFilter = CIFilter(name: "CIAffineClamp") let val = NSValue(CGAffineTransform: transform) clampFilter.setValue(val, forKey: "inputTransform") 

Update for Swift 3:

 let transform = CGAffineTransform.identity let clampFilter = CIFilter(name: "CIAffineClamp")! let val = NSValue(cgAffineTransform: transform) clampFilter.setValue(val, forKey: "inputTransform") 

Answer 2

It can do it.

 var transform = CGAffineTransformIdentity; var clampFilter = CIFilter(name: "CIAffineClamp") var value = NSValue(CGAffineTransform: transform) clampFilter.setValue(value, forKey: "inputTransform")