---
title: kCGNumReservedWindowLevels
framework: coregraphics
role: symbol
role_heading: Global Variable
path: coregraphics/kcgnumreservedwindowlevels
---

# kCGNumReservedWindowLevels

## Declaration

```swift
var kCGNumReservedWindowLevels: Int32 { get }
```

## Discussion

Discussion The number of window levels reserved by Apple for internal use. Cocoa uses this constant during compilation.

## See Also

### Constants

- [conversionBlackPointCompensation](coregraphics/cgcolor/conversionblackpointcompensation.md)
- [kCGDisplayBitsPerPixel](coregraphics/kcgdisplaybitsperpixel.md)
- [kCGDisplayBitsPerSample](coregraphics/kcgdisplaybitspersample.md)
- [kCGDisplayBlendNormal](coregraphics/kcgdisplayblendnormal.md)
- [kCGDisplayBlendSolidColor](coregraphics/kcgdisplayblendsolidcolor.md)
- [kCGDisplayBytesPerRow](coregraphics/kcgdisplaybytesperrow.md)
- [kCGDisplayFadeReservationInvalidToken](coregraphics/kcgdisplayfadereservationinvalidtoken.md)
- [kCGDisplayHeight](coregraphics/kcgdisplayheight.md)
- [kCGDisplayIOFlags](coregraphics/kcgdisplayioflags.md)
- [kCGDisplayMode](coregraphics/kcgdisplaymode.md)
- [kCGDisplayModeIsInterlaced](coregraphics/kcgdisplaymodeisinterlaced.md)
- [kCGDisplayModeIsSafeForHardware](coregraphics/kcgdisplaymodeissafeforhardware.md)
- [kCGDisplayModeIsStretched](coregraphics/kcgdisplaymodeisstretched.md)
- [kCGDisplayModeIsTelevisionOutput](coregraphics/kcgdisplaymodeistelevisionoutput.md)
- [kCGDisplayModeUsableForDesktopGUI](coregraphics/kcgdisplaymodeusablefordesktopgui.md)