问题描述
我是 macOS 应用程序的新手,但 A 已经完成了一个 iOS 应用程序。 我会尝试转换灰度图像
编译没问题,但我在“filter.outputimage”有这个运行错误
错误是:线程 1:“-[NSImage imageByColorMatchingWorkingSpacetoColorSpace:]:无法识别的选择器发送到实例 0x60000201e4e0”
怎么了?
import Cocoa
import AppKit
class ViewController: NSViewController {
@IBOutlet weak var Load: NSButton!
@IBOutlet weak var ImageSource: NSImageView!
@IBOutlet weak var ImageNG: NSImageView!
func grayscale(image: NSImage) -> NSImage? {
let width = image.size.width
let height = image.size.height
let cgsize = CGSize (width: width,height: height)
let context = CIContext(options: nil)
if let filter = CIFilter(name: "CIPhotoEffectMono") { //CIPhotoEffectNoir CIPhotoEffectMono CIPhotoEffectTonal CIPixellate
filter.setValue(image,forKey: kCIInputimageKey)
if let output = filter.outputimage {
if let cgImage = context.createCGImage(output,from: output.extent) {
return NSImage(cgImage : cgImage,size: cgsize)
}
}
}
return nil
}
@IBAction func LoadButtonClicked(_ sender: Any) {
ImageSource.image = NSImage(named:"IMAGE")
let imageNG = grayscale(image: ImageSource.image! )
ImageNG.image = imageNG
}
override func viewDidLoad() {
super.viewDidLoad()
}
override var representedobject: Any? {
didSet {
}
}
}
解决方法
kCIInputImageKey
的值是一个 CIImage
对象,而不是一个 NSImage
:
https://developer.apple.com/programs/enroll/。
也许是这样的:
if let cgImage = image.cgImage(forProposedRect: nil,context: nil,hints: nil) {
filter.setValue(CIImage(cgImage: cgImage),forKey: kCIInputImageKey)
}