我正在迅速获得不受支持的参数组合CGBitmap错误 [英] I am getting unsupported parameter combination CGBitmap error with swift

问题描述

我正在尝试快速创建CGContext.它可以编译，但在运行时会引发错误.

I am trying to create a CGContext in swift. It compiles but throws an error at runtime.

let colorSpace:CGColorSpace = CGColorSpaceCreateDeviceRGB()
let context:CGContext = CGBitmapContextCreate(nil, 20, 20, 8, 0, colorSpace, CGBitmapInfo.AlphaInfoMask)
CGColorSpaceRelease(colorSpace);

....

错误是:

Error: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; unrecognized; 96 bytes/row.
fatal error: Can't unwrap Optional.None

推荐答案

以防万一有人遇到相同的问题.下面的代码段终于可以使用了.

Just in case somebody is running into the same problem. The snippet below finally works.

let colorSpace:CGColorSpace = CGColorSpaceCreateDeviceRGB()
let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
let context = CGBitmapContextCreate(nil, UInt(rect.size.width), UInt(rect.size.height), 8, 0, colorSpace, bitmapInfo)

它迅速生成32位RGBA上下文

It generates a 32 bit RGBA context in swift

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