^运算符对BOOL做了什么？

Question

What does this statement mean?

isChecked = isChecked ^ 1;

isChecked is a BOOL .

Answer 1

The "^" is an exclusive OR operation, so 0 flips to 1, and 1 flips to zero. The result should be the same as isChecked = !isChecked .

Answer 2

它将XOR与1检查，所以我认为是真的^ 1 = 0（假）和假^ 1 = 1（真）

Answer 3

Everyone is saying it XORs the bool-- that's true-- but the purpose here is that it's toggling the bool.

The advantage of doing a bitwise toggle like this is speed and the ability to fiddle bits in extreme detail.

for more Bitwise Operators

Answer 4

It only flips the last bit of BOOL . Not a reliable way to logically negate. If someone is crazy enough to set the a BOOL variable to some number, for example 5. Then doing ^ 1 will only flip the last bit of the value to 4, which is still evaluated to YES .

If you want to logically negate, use ! operator instead.

Answer 5

^ is the exclusive or operator.

In your example it is used to create a toggle - isChecked will be set only if isChecked was previously unset.

Answer 6

this is bitwise XOR operator and changes 0 to 1, and 1 to zero. see all opertors here .

Answer 7

"^" is called an exclusive OR or XOR operation. In this case, it will change boolean from true to false and vice-versa.

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