swift版键盘弹出+textView换行(仿短信输入框)

上代码:

键盘回收弹出

主要是取出系统通知里的参数用到动画展示中

    // 注册通知
    func registNotification(){
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHid:"), name: UIKeyboardWillHideNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillChange:"), name: UITextViewTextDidChangeNotification, object: nil)
    }

    // 将要出现
    func keyboardWillShow(notification:NSNotification){
        // 通知传参
        let userInfo  = notification.userInfo
        // 取出键盘bounds
        let  keyBoardBounds = (userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
        // 时间
        let duration = (userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber).doubleValue
        // 动画模式
        let options = UIViewAnimationOptions(rawValue: UInt((userInfo![UIKeyboardAnimationCurveUserInfoKey] as! NSNumber).integerValue << 16))
        // 偏移量
        let deltaY = keyBoardBounds.size.height
        // 动画
        let animations:(() -> Void) = {
            
            self.transform = CGAffineTransformMakeTranslation(0,-deltaY)
        }
        // 判断是否需要动画
        if duration > 0 {
            UIView.animateWithDuration(duration, delay: 0, options:options, animations: animations, completion: nil)
        }else{
            
            animations()
        }
    }
    // 将要收起
    func keyboardWillHid(notification:NSNotification){
        let userInfo  = notification.userInfo
     
        let duration = (userInfo![UIKeyboardAnimationDurationUserInfoKey] as! NSNumber).doubleValue
        let animations:(() -> Void) = {
            self.transform = CGAffineTransformIdentity
        }
        if duration > 0 {
            let options = UIViewAnimationOptions(rawValue: UInt((userInfo![UIKeyboardAnimationCurveUserInfoKey] as! NSNumber).integerValue << 16))
            
            UIView.animateWithDuration(duration, delay: 0, options:options, animations: animations, completion: nil)
        }else{
            animations()
        }

    }

textView换行

主要是通过当前textView.contentSize的高度计算出textView改变后的frame赋值给textView

    // 将要改变
    func keyboardWillChange(notification:NSNotification){
        let contentSize = self.textView.contentSize
        if contentSize.height > 140{
            return;
        }
        var selfframe = self.frame
       // 计算textView距离上下X2的距离 再加上textView的高
        var selfHeight = (self.textView.superview?.frame.origin.y)! * 2 + contentSize.height
        if selfHeight <= selfDefultHight {
            selfHeight = selfDefultHight
        }
        let selfOriginY = selfframe.origin.y - (selfHeight - selfframe.size.height)
        selfframe.origin.y  = selfOriginY;
        selfframe.size.height = selfHeight;
        self.frame = selfframe;
        self.textView.frame = CGRectMake(1, 1, textViewW, selfHeight-20);
        self.backgroundView.frame = CGRectMake(10, 10, textViewW+2, selfHeight-18);
    }

背景那一条线是一个底部的黑色View

代码地址:https://github.com/Lafree317/ZECustomTextView