将滤镜应用于UIImage时，结果颠倒了

Question

这真让我讨厌。 当我将UIImage转换为CIImage时，应用滤镜，然后将图像上下颠倒地转换（对于横向）或逆时针旋转90度（对于纵向）。

var image:UIImage?
var index:Int?

@IBOutlet weak var photo: UIImageView!

@IBAction func editImage(sender: UIBarButtonItem) {
    println("editImage")
    let beginImage = CIImage(image: self.image)
    let filter = CIFilter(name: "CISepiaTone")
    filter.setValue(beginImage, forKey: kCIInputImageKey)
    filter.setValue(0.8, forKey: kCIInputIntensityKey)
    let newImage = UIImage(CIImage: filter.outputImage)
    self.photo.image = newImage
}

Answer 1

将图像方向和已过滤图像的比例设置回原始值：

let newImage = UIImage(CIImage:filter.outputImage, scale:self.image.scale, orientation:self.image.imageOrientation)