我正在使用核心图像,我正在为我的图像应用CIFilter棕褐色调.我在viewDidLoad中运行一次过滤器,然后立即调用另一个再次添加过滤器的函数.出于某种原因,当我尝试访问输出图像时,应用程序崩溃并说输出图像为零.任何人都知道为什么会这样吗？
谢谢
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var myimage: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view,typically from a nib.
let image = CIImage(image: myimage.image)
let filter = CIFilter(name: "CISepiaTone")
filter.setDefaults()
filter.setValue(image,forKey: kCIInputImageKey)
myimage.image = UIImage(CIImage: filter.outputImage)
self.reapplyFilter()
}
func reapplyFilter(){
let image = CIImage(image: myimage.image)
let filter = CIFilter(name: "CISepiaTone")
filter.setDefaults()
filter.setVa lue(image,forKey: kCIInputImageKey)
//ERROR HERE: fatal error: unexpectedly found nil while unwrapping an Optional value
myimage.image = UIImage(CIImage: filter.outputImage)
//ERROR
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
