iOS開發——Swift實戰篇&通知之鍵盤的現實與隱藏（加鍵盤工具條）

標籤：

看這篇文章之前，建議讀者先瞭解一下通知NSNotifation的通訊原理

不好描述，我先：

就是點擊“完成”可以隱藏鍵盤和自己，鍵盤出來時他們也跟著出來，對，就是這種效果，非常常用

1，設定keyboardHeaderview和“完成”(這裡的self.keyboardHeaderView設定成了self對象)

 1 　　　　　　  self.keyboardHeaderView.frame = CGRect(x: 0,y: DeviceFrame.height+StatusBarFrame.height,width: DeviceFrame.width,height: 30) 2             self.keyboardHeaderView.backgroundColor = UIColor(white:0, alpha: 0.6) 3             var hiddenKeyBoardLabel:UILabel = UILabel(frame:CGRect(x:0,y:0,width:DeviceFrame.width-10,height:30)) 4             hiddenKeyBoardLabel.text = "完成" 5             hiddenKeyBoardLabel.textColor = UIColor.blueColor() 6             hiddenKeyBoardLabel.textAlignment = .Right 7              8             var tap:UITapGestureRecognizer = UITapGestureRecognizer(target:self,action:Selector("hideKeyboard:")) 9             self.keyboardHeaderView.userInteractionEnabled = true10             self.keyboardHeaderView.addGestureRecognizer(tap)11             12             self.keyboardHeaderView.addSubview(hiddenKeyBoardLabel)13             self.view.addSubview(self.keyboardHeaderView)

 

點擊“完成”，調用方法（這裡的self.content是一個UITextField或者UITextView對象）

 1 //hide keyboard 2  func hideKeyboard(sender:AnyObject){ 3  self.content.resignFirstResponder() 4 } 

 

2，設定keyboard監聽事件：

1             NSNotificationCenter.defaultCenter().addObserver(self,selector:Selector("keyboardWillShow:"),name:UIKeyboardWillShowNotification,object:nil)2             NSNotificationCenter.defaultCenter().addObserver(self,selector:Selector("keyboardWillHide:"),name:UIKeyboardWillHideNotification,object:nil)

 

//下面就是鍵盤隱藏時觸發的事件，我在這個事件裡面完成我們想要的功能（就是設定keyboardHeaderview跟著鍵盤隱藏和出現）

 1   //Keyboard will show 2     func keyboardWillShow(sender:NSNotification){ 3         let userInfo = sender.userInfo 4         let keyboardInfo : (AnyObject!) = userInfo.objectForKey(UIKeyboardFrameEndUserInfoKey) 5         let keyboardRect:CGRect = keyboardInfo.CGRectValue() as CGRect 6         let height = keyboardRect.size.height as Float 7          8         UIView.animateWithDuration(0.3, animations: { 9             var y:Float = DeviceFrame.height+StatusBarFrame.height - height-self.keyboardHeaderView.frame.height10             self.keyboardHeaderView.frame = CGRect(x: 0,y: y,width: DeviceFrame.width,height: 30)11         })12     }13     14     //keyboard will hide15     func keyboardWillHide(sender:NSNotification){16         UIView.animateWithDuration(0.3, animations: {17             self.keyboardHeaderView.frame = CGRect(x: 0,y: DeviceFrame.height+StatusBarFrame.height,width: DeviceFrame.width,height: 30)18         })19     }

實現這個功能之後，我們一般都是在上面現實一個鍵盤的工具條用於實現表情鍵盤。

iOS開發——Swift實戰篇&通知之鍵盤的現實與隱藏（加鍵盤工具條）