我正在使用核心图像,并对我的图像应用CIFilter棕褐色调。在viewDidLoad中运行一次滤镜,然后立即调用另一个函数再次添加滤镜。出于某种原因,当我尝试访问输出图像时,应用程序会崩溃并显示输出图像为空。有人知道这是为什么吗?
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.
}
}
CIContext
)。是否存在相关风险? - SwiftArchitectUIImage(CIImage:)
并将其放入图像视图完全不同;这正是我所说的不要做的。- 还请参阅我的书:http://www.apeth.com/iOSBook/ch15.html#_cifilter_and_ciimage - matt