如何獲取UIButton ID？

Question

我已創建5個按鈕動態斯威夫特這樣的：

for theIndex in 0..<5 { 

     let aButton = UIButton() 
     aButton.frame = CGRectMake(self.view.bounds.width/2 - 120, self.view.bounds.height/2 - 150, 240, 300) 
     aButton.setTitle("Button \(theIndex)", forState: .Normal) 
     aButton.addTarget(self, action: "btnClicked:", forControlEvents:.TouchUpInside) 

     self.view.addSubview(aButton) 
    } 

但我怎麼能得到BUTTON_ID爲每一個？

func btnClicked(sender: AnyObject?) { 
     let vc = storyboard!.instantiateViewControllerWithIdentifier("vc_name") as! DetailVC 
     vc.selectedId = **WANT_TO_PASS_BUTTON_ID_HERE** 
     self.presentViewController(vc, animated:true, completion:nil) 
    } 

Answer 1

您可以用按鈕（例如，你可以設置有一個按鈕的指數）tag財產，後來在func btnClicked(sender: AnyObject?)方法檢索它來確定與指數被推

，而騎自行車的按鈕通過你的指標做：

aButton.tag = theIndex 

和方法做：

vc.selectedId = sender.tag 

參考參考Apple docs on UIView