Compiler Error: Method With Objective-C Selector Conflicts With Previous Declaration With the Same Objective-C Selector

Compiler error: Method with Objective-C selector conflicts with previous declaration with the same Objective-C selector

Objective-C does not support method overloading, you have to use a different method name. When you inherited UIViewController you inherited NSObject and made the class interopable to Obj-C. Swift on the other hand does support overloading, that's why it works when you remove the inheritance.

Method with Objective-C selector conflicts - 'with' at the end

#str will be translated to withStr in objc. You can use the @objc(someOtherSelectorName:) annotation to specify a different selector name for objc and avoid the conflict.

Swift - Method '*()' with Objective-C selector '*' conflicts with getter for '*' from superclass 'UIView' with the same Objective-C selector

Try renaming the borderColor variable name. It seems the ChartViewBase is using it.

Also please change all property names from your custom classes that are conflicting with your base class variable names and property names.

This should work.. Cheers!

Swift 2, method 'setOn' with Objective-C selector 'setOn:' conflicts with setter for 'on' with the same Objective-C selector

Similarly as in Compiler error: Method with Objective-C selector conflicts with previous declaration with the same Objective-C selector, you can also hide properties from
the Objective-C runtime with @nonobjc:

public class AView: UIView {
    @nonobjc var on: Bool = false

    public func setOn(on: Bool, animated: Bool) {
        self.on = on
        // do something more about animating
    }

    public func setOn(on: Bool) {
        setOn(on, animated: false)
    }
}

which prevents a conflicting Objective-C setter from being auto-generated.

Method 'Method()' with Objective-C selector 'Method' conflicts with getter for 'Method' with the same Objective-C Selector

You'll have to change the function name, or override those functions if that's what you want.

By the way, name conflicting should always be avoided. I suggest using something like myURL, myCanGoBack().

Error declaring method with Objective-C selector

Selectors have changed with Xcode 7.3. You need to explicitly declare the selector that belongs to your class:

class MyClass {
    func someFunc() {
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(MyClass.itemDroppedOnCharacter(_:)), name: "onTargetDropped", object: nil)
    }

    @objc func itemDroppedOnCharacter(notif: AnyObject) {
        print("Item Dropped On Character")
    }
}

You can also have MyClass inherit from NSObject if you don't want to add @objc to expose the selector to Objective-C:

class MyClass: NSObject {
    func someFunc() {
        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(MyClass.itemDroppedOnCharacter(_:)), name: "onTargetDropped", object: nil)
    }

    func itemDroppedOnCharacter(notif: AnyObject) {
        print("Item Dropped On Character")
    }
}

Swift - Method '*()' with Objective-C selector '*' conflicts with getter for '*' from superclass 'NSObject' with the same Objective-C selector

To elaborate: @property(readonly) NSUInteger hash is an Objective-C property of NSObject, that means there is a getter created for that variable, namely hash().

You now try to define a method of the same name and the same parameters (none) but with a different return type (UInt instead of NSUInteger, which would be Int in swift.). Therefore you receive the given error. To resolve that issue you have two options now:

• change the return type to Int -> that will override the predefined hash function
• choose a different method name or add parameters

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