How To Know UIButton Pressed in Swift Ios 

var button = UIButton(frame: CGRect(x: 0, y: 0, width: 150, height: 60))
button.backgroundColor = UIColor.blackColor()
button.layer.cornerRadius = 3.0
button.setTitle("Tap Me", forState: .Normal)
button.addTarget(self, action: "buttonTapped", forControlEvents: .TouchUpInside)
 
func buttonTapped() {
    println("Button tapped!")
}

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