iOS获取键盘的高度

监听键盘的通知

//增加监听，当键盘出现或改变时收出消息
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(keyboardWillShow:)
                                                name:UIKeyboardWillShowNotification
                                              object:nil];
   
   //增加监听，当键退出时收出消息
   [[NSNotificationCenter defaultCenter] addObserver:self
                                            selector:@selector(keyboardWillHide:)
                                                name:UIKeyboardWillHideNotification
                                              object:nil];

通过通知方法获取键盘Rect 跟 Duration

//当键盘出现或改变时调用
- (void)keyboardWillShow:(NSNotification *)note
{
    //取出键盘最终的frame
    CGRect rect = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    
    //取出键盘弹出需要花费的时间
    double duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
}

当滚动tableview时，就收起键盘：

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    //方式一
    [self.view endEditing:YES];
    //方式二：用textField
    [self.textField endEditing:YES];
    //方式三：
    [self.textField resignFirstResponder];
}

不同过代码,在StoryBoard设置当滚动tableView隐藏键盘

Snip20160620_16.png

当viewcontroller销毁时，需要移除这个通知监听

// 移除通知
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}