How do I create an alpha only bitmap context

拈花ヽ惹草 提交于 2019-12-01 03:41:50

The docs clearly state you can use values from the CGImageAlphaInfo even though the parameter is defined as needed a value from the CGBitmapInfo enum.

One solution would be to cast the value:

(CGBitmapInfo)kCGImageAlphaOnly

That will make the compiler happy.

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