TextView随键盘弹出上移高度

很多时候我们都在为键盘遮挡了原本就不大的屏幕时而烦恼，特别是当用户处于编辑状态时，键盘下面的内容就看不见了，用户只能处于盲打状态了。现在有一种简单的解决办法，基本思路就是，添加通知。一直监听键盘事件，在键盘遮挡时，将编辑器上移键盘的高度，键盘消失时，编辑区回复原来位置，ok，来两段代码吧

 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
     self.textView=[[UITextView alloc]initWithFrame:self.view.frame];
     self.textView.text=@"请输入文字";
     [self.view addSubview:self.textView];
 } 

 - (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 } 

 - (void)viewWillAppear:(BOOL)animated
 {
     //注册通知,监听键盘出现
     [[NSNotificationCenter defaultCenter]addObserver:self
                                             selector:@selector(handleKeyboardDidShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
     //注册通知，监听键盘消失事件
     [[NSNotificationCenter defaultCenter]addObserver:self
                                             selector:@selector(handleKeyboardDidHidden)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];
     [super viewWillAppear:YES];
 } 

 //监听事件
 - (void)handleKeyboardDidShow:(NSNotification*)paramNotification
 {
     //获取键盘高度
     NSValue *keyboardRectAsObject=[[paramNotification userInfo]objectForKey:UIKeyboardFrameEndUserInfoKey]; 

     CGRect keyboardRect;
     [keyboardRectAsObject getValue:&keyboardRect]; 

     self.textView.contentInset=UIEdgeInsetsMake(, ,keyboardRect.size.height, );
 } 

 - (void)handleKeyboardDidHidden
 {
     self.textView.contentInset=UIEdgeInsetsZero;
 } 

 - (void)viewDidDisappear:(BOOL)animated
 {
     [[NSNotificationCenter defaultCenter] removeObserver:self];
 }