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");
}
*/
}