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The attached screen shot says it all: I have a valid true Bool, I negate it with the bang operator, and (Xcode tells me) I have an invalid value.
It appears that this "invalid" value does behave as if it were false. But really, wtf?
908
Detects when a program accesses a Boolean variable and its value isn't true or false.
Swift recognizes a value as boolean if it sees true or false . You can implicitly declar a boolean variable let a = false or explicitly declare a boolean variable let i:Bool = true .
I've had this issue in Xcode 8.3.1 and Swift 3.1 https://github.com/onmyway133/notes/issues/278
I tried
But does not work. The workaround is to
let enabled = disable ? false : true
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