有关实现UIButton扩展的问题

Question

I have a call button in multiple VCs which performs action of calling on same number. Instead of defining same func in each VC i decided to create extension of UIButton.

Need help , Not sure why am i facing issue but getting error at target:self saying Expected parameter type following ':'

Following is the code:-

extension UIButton {
    func callBtn(target:self)
    {
        let url = NSURL(string: "tel://1234567890")!
        UIApplication.sharedApplication().openURL(url)
    }
}

EDIT: Updated to mentioned solution:-

extension UIButton {
    func callBtn(target:UIButton)
    {
        let url = NSURL(string: "tel://1234567890)")!
        UIApplication.sharedApplication().openURL(url)
    }
}

Inside Required VCs :- (Calling as follows)

callBtn.addTarget(self, action: #selector(callBtn.callBtn(_:)), forControlEvents: .TouchUpInside)

Getting following error:-

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '- unrecognized selector sent to instance 0x15e8b330 '

Answer 1

your code should be like,

extension UIButton {
func callBtn(target:UIButton)
{
    let url = NSURL(string: "tel://1234567890")!
    UIApplication.sharedApplication().openURL(url)
}
}

Answer 2

If you'll look at the error, it says an unrecognized selector has been sent to an instance. It is because the 'action' which you add in the addTarget: method of the button is supposed to be called on the target . Here you have given as self which is a object of type UIViewController and it does not have a method called callBtn: . So it wont recognize the the callBtn: method call. Instead change the extension from UIButton to UIViewController so that it implements the method. So whenever the button is tapped it will call your action method ( callBtn: ) on your target self which is a UIViewController .

extension UIViewController {
    func callBtn(sender: UIButton) {
        let url = NSURL(string: "tell://1234567890")!
    }
}

Answer 3

try using..

  extension UIButton {
        func callBtn(target:UIButton)
        {
            let url = NSURL(string: "tel://1234567890")!
            UIApplication.sharedApplication().openURL(url)
        }
    }

Still you need any help feel free to ask me.