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func onSendEmail(emailAddr:String) {
}

// Method 1: colon behind the method name
let btnEmail = UIBarButtonItem.init(title: "Email Me", style: .plain, target: self, action: #selector(onSendEmail:))


// Method 2: 
let btnEmail = UIBarButtonItem.init(title: "Email Me", style: .plain, target: self, action: #selector(onSendEmail as (String) -> ()))