How to convert a float to a CGFloat

Paul Hudson    September 15th 2016    @twostraws

The Float and CGFloat data types sound so similar you might think they were identical, but they aren't: CGFloat is flexible in that its precision adapts to the type of device it's running on, whereas Float is always a fixed precision. Thus, you never lose precision converting from Float to CGFloat, whereas you might going the other way.

To convert, just use the CGFloat constructor, like this:

let myCGFloat = CGFloat(myFloat)

Available from iOS 7.0

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