[英]Getting CIImage from UIImage (Swift)
试图从 UIImage 获取 CIImage 以便将其用于 CIFilter,但在最后一行出现以下异常:
Execution was interrupted, reason: EXC_BREAKPOINT (code=EXC_I386_BPT, subcode=0x0)
我究竟做错了什么?
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
更新:按照不要将 CIImage 实例化为变量的建议,我重新编写了我的初始代码片段以在操场上工作:
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)
如果您正在尝试使用过滤器,我解决了这个游乐场错误:
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())
在一行中是可能的。
UIImage > CIImage
let ciimage = CIImage(image: image)
CIImage > UIImage
let image = UIImage(ciImage: ciimage)
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