Overloaded functions in swift error [duplicate] - ios

Question

This question already has answers here:
Compiler error: Method with Objective-C selector conflicts with previous declaration with the same Objective-C selector
(6 answers)
Closed 7 years ago.
I am new to swift and have an error in the following code. I have one function with two different parameters. Xcode(version 6) is giving an error on the second definition with a parameter as a function which takes one value.Here is the code:
func performOperation(operation: (Double, Double) -> Double) {
if(operandStack.count >= 2){
displayValue = operation(operandStack.removeLast(), operandStack.removeLast())
enter()
}
}
func performOperation(operation: Double -> Double){
if(operandStack.count >= 1){
displayValue = operation(operandStack.removeLast())
enter()
}
}

Answer 1

Update:
Another solution is add private before method definition (Source):
private func performOperation(operation: (Double, Double) -> Double) {
if(operandStack.count >= 2){
displayValue = operation(operandStack.removeLast(), operandStack.removeLast())
enter()
}
}
private func performOperation(operation: Double -> Double){
if(operandStack.count >= 1){
displayValue = operation(operandStack.removeLast())
enter()
}
}
Original Answer:
Looks like your methods are defined in class that is inherited from some Objective-C class, for example:
class TestClass : NSObject {
func test(a : String) {}
func test(a : UInt) {}
}
Compiler will produce such error:
Method 'test' with Objective-C selector 'test:' conflicts with
previous declaration with the same Objective-C selector.
To fix that you need avoid inheritance from Objective-C class:
class TestClass {
func test(a : String) {}
func test(a : UInt) {}
}
This variant will work correct.
The problem is that Objective-C doesn't support methods overloading, but Swift does. That's why you need create pure Swift class.