iOS 获得键盘的高度 NSNotificationCenter

//在遇到有输入的情况下。由于现在键盘的高度是动态变化的。中文输入与英文输入时高度不同。所以输入框的位置也要做出相应的变化
#pragma mark - keyboardHight
-(void)viewWillAppear:(BOOL)animated
{
    [self registerForKeyboardNotifications];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)registerForKeyboardNotifications
{
    //使用NSNotificationCenter 鍵盤出現時
    [[NSNotificationCenter defaultCenter] addObserver:self
     
                                             selector:@selector(keyboardWasShown:)
     
                                                 name:UIKeyboardDidShowNotification object:nil];
    
    //使用NSNotificationCenter 鍵盤隐藏時
    [[NSNotificationCenter defaultCenter] addObserver:self
     
                                             selector:@selector(keyboardWillBeHidden:)
     
                                                 name:UIKeyboardWillHideNotification object:nil];
     
    
}



//实现当键盘出现的时候计算键盘的高度大小。用于输入框显示位置
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    //kbSize即為鍵盤尺寸 (有width, height)
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;//得到鍵盤的高度
    NSLog(@"hight_hitht:%f",kbSize.height);
    if(kbSize.height == 216)
    {
        keyboardhight = 0;
    }
    else 
    {
        keyboardhight = 36;   //252 - 216 系统键盘的两个不同高度
    }
    //输入框位置动画加载
    [self begainMoveUpAnimation:keyboardhight];
}

//当键盘隐藏的时候
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
     //do something
}


//(TextView) 当键盘开始输入前。时行计算与动画加载
-(void)textViewDidBeginEditing:(UITextView *)textView
{
    NSLog(@"gegin animation");
    sendMsgTextView =textView;
    resultCommunityTableview.frame = CGRectMake(0, 36, 320, 150);
    //动画加载
    [self begainMoveUpAnimation:0.0 ];
    
}


//关闭键盘(TextView) 换行时。隐藏键盘
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text  
{  
    resultCommunityTableview.frame = CGRectMake(0, 36, 320, 376);
    if ([text isEqualToString:@"\n"]) {  
        [textView resignFirstResponder];  
        return NO;  
    }
    return YES;  
}  



//输入结束时调用动画（把按键。背景。输入框都移下去）
-(void)textViewDidEndEditing:(UITextView *)textView
{
    NSLog(@"tabtabtab");
    [self endEditAnimation];
    
    //释放
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];
}



//判断当前输入法
-(void)textViewDidChangeSelection:(UITextView *)textView
{
    NSLog(@"wewe:%@",[[UITextInputMode currentInputMode] primaryLanguage]);
    /*
    if ([[UITextInputMode currentInputMode] primaryLanguage] == @"en-US") { 
        NSLog(@"en-US"); 
    } 
    else 
    { 
        NSLog(@"zh-hans"); 
    } 
     */
}