ios textView跟随键盘的移动

@interface ViewController ()<UITextViewDelegate>
@property(nonatomic,strong)UITextView *textView;
@end

- (void)viewDidLoad {
    [super viewDidLoad];
    _textView = [[UITextView alloc]initWithFrame:CGRectMake(15,[UIScreen mainScreen].bounds.size.height-55 , [UIScreen mainScreen].bounds.size.width-30, 50)];
    _textView.delegate = self;
    _textView.backgroundColor = [UIColor redColor];
    [self.view addSubview:_textView];
    
    
    //设置两个通知
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyHiden:) name: UIKeyboardWillHideNotification object:nil];
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(keyWillAppear:) name:UIKeyboardWillChangeFrameNotification object:nil];
    
    
    
    
}

#pragma mark-键盘出现隐藏事件
-(void)keyHiden:(NSNotification *)notification
{
    // self.tooBar.frame = rect;
    [UIView animateWithDuration:0.25 animations:^{
        //恢复原样
        _textView.transform = CGAffineTransformIdentity;
//        commentView.hidden = YES;
    }];
    
    
}
-(void)keyWillAppear:(NSNotification *)notification
{
    
    
    //获得通知中的info字典
    NSDictionary *userInfo = [notification userInfo];
    CGRect rect= [[userInfo objectForKey:@"UIKeyboardFrameEndUserInfoKey"]CGRectValue];
    // self.tooBar.frame = rect;
    [UIView animateWithDuration:0.25 animations:^{
        _textView.transform = CGAffineTransformMakeTranslation(0, -([UIScreen mainScreen].bounds.size.height-rect.origin.y));
    }];
    
    
}

//点击空白处收起键盘
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [_textView resignFirstResponder];
}