Preliminary use of swift iOS development

Create a swift empty project with the Xcode6-Beta, create a UIViewController, and select swift language.

@ IBOutlet var titleLabel: UILabel? @ IBOutlet var button: UIButton? // @ IBOutlet weak var button: UIButton? /@ IBAction func btnClick (AnyObject ){}

 

Drag a UIButton and UILabel in the xib file to bind the object. The operation is similar to that in Xcode.

Add the content of the click event. In this example, a UIAlertView is displayed, and the delegate is self. The delegate statement is followed by a comma, as shown below,

class MainViewController: UIViewController,UIAlertViewDelegate{}

The initialization code for the current successful test of UIAlertView is as follows:

    let alert = UIAlertView()    alert.title = ""    alert.delegate = self    alert.message = "Hello Apple"    alert.addButtonWithTitle("OK")    alert.addButtonWithTitle("Cancel")    alert.show()

Other initialization APIs tried are executed abnormally.

//     let alert = UIAlertView(title: "title", message: "Hello Apple", delegate: self, cancelButtonTitle:"Cancel")//    let alert = UIAlertView(title: "title", message: "Hello Apple",delegate: self, cancelButtonTitle: "Cancel",otherButtonTitles:"OK");

Click the event delegate button to implement UIAlertView

    func alertView(alertView: UIAlertView!, clickedButtonAtIndex buttonIndex: Int)    {        switch buttonIndex        {        case 0:            println("alertView Ok!")        case 1:            println("alertView cancel!")        default:            println("alertView cancel!")        }    }

It can be seen that the switch does not require break, and the previous method cannot be used at present.

Case 0: case 1: println ("alertView cancel! ")
Break; // can be replaced with case 0 .. 2: println ("alertView OK! ")