Does PHImageManager return images in pixel or point size for 2x and 3x screens?

According to my experiments with PHImageManageryou must provide a targetSize in pixels. For example, imagine you wanna request an image with the size 400x800 px. For this case you can set the target size like the following:

 // Set target size. let targetSize = CGSizeMake(400, 800)

Regarding your code example, in the Apple's docs stated that:

The coordinates of the frame rectangle are always specified in points.

So to set the correct target size in this case you can use code similar to the following:

// Get scale factor associated with the screen. let scale = UIScreen.mainScreen().scale// Request the image.imageManager.requestImageForAsset(self.imageAsset,            targetSize: CGSizeMake(self.frame.size.width * scale, self.frame.size.height * scale),            contentMode: .AspectFit,            options: imageRequestOptions,            resultHandler: { (image, info) -> Void in                // Handle the result here...        })

It's hard to tell from your code whether you realize that the resultHandler will be called multiple times. The first time it is called, you may get a low-resolution low-quality image. But eventually it will be called with a correctly scaled image.