使用UIAlertAction到標籤欄增加徽章斯威夫特

Question

@IBAction func addToCart(sender: AnyObject) { 
    let itemObjectTitle = itemObject.valueForKey("itemDescription") as! String 

    let alertController = UIAlertController(title: "Add \(itemObjectTitle) to cart?", message: "", preferredStyle: .Alert) 

    let yesAction = UIAlertAction(title: "Yes", style: UIAlertActionStyle.Default) { (action) in 

     var badgeNumber = 0 

     self.navigationController!.tabBarItem.badgeValue == "\(badgeNumber++)" 

    } 
    let cancelAction = UIAlertAction(title: "Cancel", style: .Default, handler: nil) 
    alertController.addAction(yesAction) 
    alertController.addAction(cancelAction) 

    presentViewController(alertController, animated: true, completion: nil) 

} 

我需要的「是」選擇報警來增加在標籤欄項目徽章每按一次，有沒有人有這個問題？

Answer 1

let yesAction = UIAlertAction(title: "Yes", style: .Default) { action in 
     // Your code to update the tab bar here 
} 

備選：

UIAlertAction(title: "Yes", 
       style: UIAlertActionStyle.Default, 
      handler: { // Code goes here 
})