Getting CIImage from UIImage (Swift)

Question

Trying to obtain CIImage from UIImage in order to use it for CIFilter, but getting the following exception at the last line:

Execution was interrupted, reason: EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0)

What am I doing wrong?

import UIKit

UIGraphicsBeginImageContextWithOptions(CGSizeMake(100,100), false, 0)
let con:CGContextRef = UIGraphicsGetCurrentContext()
CGContextAddEllipseInRect(con, CGRectMake(0,0,100,100))
CGContextSetFillColorWithColor(con, UIColor.blueColor().CGColor)
CGContextFillPath(con)
let im:UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

let ciimage = CIImage(image: im) // <- Exception here

UPDATE: Following the advice not to instantiate CIImage as a variable I reworked my initial code snippet to work in a playground:

UIGraphicsBeginImageContextWithOptions(CGSizeMake(100,100), false, 0)
let con:CGContextRef = UIGraphicsGetCurrentContext()
CGContextAddEllipseInRect(con, CGRectMake(0,0,100,100))
CGContextSetFillColorWithColor(con, UIColor.blueColor().CGColor)
CGContextFillPath(con)
let im:UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()

//let ciimage = CIImage(image: im) // <- this was causing an exception

let filter = CIFilter(name: "CIGaussianBlur", withInputParameters: [kCIInputRadiusKey: 10, kCIInputImageKey: CIImage(image: im)]) // <- this does not cause an exception
let calayer = CALayer()
calayer.contents = CIContext(options:nil).createCGImage(filter.outputImage, fromRect: filter.outputImage.extent())
calayer.frame = CGRect(x: 0, y: 0, width: 270, height: 270)
var view = UIView()
view.frame = calayer.frame
view.layer.addSublayer(calayer)
XCPShowView("view", view)

Answer 1

It's possible in one line.

UIImage > CIImage

let ciimage = CIImage(image: image)

CIImage > UIImage

let image = UIImage(ciImage: ciimage)

Answer 2

If you are trying to work with filters, I worked around this playground bug:

let pic = UIImage(named: "crumpled.jpg")
let filter = CIFilter(name: "CISepiaTone")
filter.setValue(CIImage(image: pic), forKey: kCIInputImageKey)
filter.setValue(0.8, forKey: kCIInputIntensityKey)
let ctx = CIContext(options:nil)
let cgImage = ctx.createCGImage(filter.outputImage, fromRect:filter.outputImage.extent())