iosswiftcocoa-touchuialertviewuialertcontroller

How would I create a UIAlertView in Swift?


I have been working to create a UIAlertView in Swift, but for some reason I can't get the statement right because I'm getting this error:

Could not find an overload for 'init' that accepts the supplied arguments

Here is how I have it written:

let button2Alert: UIAlertView = UIAlertView(title: "Title", message: "message",
                     delegate: self, cancelButtonTitle: "OK", otherButtonTitles: nil)

Then to call it I'm using:

button2Alert.show()

As of right now it is crashing and I just can't seem to get the syntax right.


Solution

  • From the UIAlertView class:

    // UIAlertView is deprecated. Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead

    On iOS 8, you can do this:

    let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
    alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
    self.presentViewController(alert, animated: true, completion: nil)
    

    Now UIAlertController is a single class for creating and interacting with what we knew as UIAlertViews and UIActionSheets on iOS 8.

    Edit: To handle actions:

    alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action in
        switch action.style{
        case .Default:
            print("default")
            
        case .Cancel:
            print("cancel")
            
        case .Destructive:
            print("destructive")
        }
    }}))
    

    Edit for Swift 3:

    let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
    self.present(alert, animated: true, completion: nil)
    

    Edit for Swift 4.x:

    let alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: .alert)
    alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { action in
        switch action.style{
            case .default:
            print("default")
            
            case .cancel:
            print("cancel")
            
            case .destructive:
            print("destructive")
            
        }
    }))
    self.present(alert, animated: true, completion: nil)