问题
I know it's possible to create transparent windows in Cocoa, although is it possible to blur whatever is behind it? I know there's been similar questions, but they deal more blurring what is within the actual NSView, not what is behind it. Is this even possible, and If so what method would I need to look into?
Possible Impossible?
回答1:
In order to answer you, yes its Possible.
If you want that effect, check out this GitHub Project I created. I subclassed NSWindow in order to disable opacity and then I added a Background Filter:Gaussian Blur to the NSView using the View Effects Inspector located at the Xcode Utilities Side Bar (you can change the radius value for more or less blur effect).
If you want the new Yosemite View effect, check out the new class they released NSVisualEffectView, just subclass the NSView you want to use this effect.
Hope you find my answer useful.
Best regards,
回答2:
My contribution as I wanted to set the radius and the color.
Doing it in a custom view to blur what is behind. HTH
view.wantsLayer = true
view.layerUsesCoreImageFilters = true
view.layer?.backgroundColor = NSColor(red: 0.2, green: 0.2, blue: 0.2, alpha: 0.5).CGColor
let blurFilter = CIFilter(name: "CIGaussianBlur")
blurFilter?.setDefaults()
blurFilter?.setValue(2.5, forKey: kCIInputRadiusKey)
view.layer?.backgroundFilters?.append(blurFilter!)
来源：https://stackoverflow.com/questions/23821693/cocoa-nsview-blurred-background