ios swift Button, Label, AlertView

 import UIKit

class ViewController: UIViewController , UIAlertViewDelegate {
    @IBOutlet var label: UILabel?
    @IBOutlet var btn: UIButton?
    
    @IBAction func btnClick(AnyObject) {
        showAlert()
    }
    
    func showAlert() {
        let alert = UIAlertView()
        alert.title = "Alert"
        alert.delegate = self
        alert.message = "Hello Apple"
        alert.addButtonWithTitle("OK")
        alert.addButtonWithTitle("Cancel")
        alert.show()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func alertView(alertView: UIAlertView!, clickedButtonAtIndex buttonIndex: Int) {
        switch buttonIndex
            {
        case 0:
            self.label?.text = "ok";
        case 1:
            self.label?.text = "cancel"
        default:
            println("alertView cancel!")
        }
    }
}

 

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