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我正在通过PHImageManager从相机胶卷加载图像,但返回的图像不是视网膜分辨率.我是否必须自己提供2倍和3倍的倍增器,或者我有什么问题吗？

这是我的代码:

class ReviewableImageView: UIImageView {

    ...unrelated code

    imageRequestOptions = PHImageRequestOptions()
    imageRequestOptions.deliveryMode = .HighQualityFormat
    imageRequestOptions.resizeMode = .Exact

    ...unrelated code

    self.contentMode = .ScaleAspectFit
    self.backgroundColor = UIColor.clearColor()
    self.userInteractionEnabled = true

    ... unrelated code

    func reloadImage(){
        let imageManager = PHCachingImageManager()//PHImageManager()

        imageManager.requestImageForAsset(self.imageAsset,
            targetSize: self.frame.size,
            contentMode: .AspectFit,
            options: imageRequestOptions,
            resultHandler: { (image: UIImage!, info: [NSObject : AnyObject]!) in
                self.image = image
        })
    }

}