在textView中输入时避免键盘的遮挡

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
[cpp] 
- (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];