ios动态获得键盘高度，并改变对话框的位置

NSNotificationCenter：键盘出现、消失时的通知

UIKeyboardWillShowNotification;UIKeyboardDidShowNotification;UIKeyboardWillHideNotification;UIKeyboardDidHideNotification;

在要使用键盘的视图控制器中（既viewDidLoad中），接收键盘事件的通知：

- (void) registerForKeyboardNotifications
{

//键盘改变时候会调用
    [[NSNotificationCenter defaultCenter]
addObserver:self selector:@selector(keyboardWasShown:)
name:UIKeyboardWillChangeFrameNotification object:nil];

//键盘收起会调用
    [[NSNotificationCenter defaultCenter] 
addObserver:self selector:@selector(keyboardWasHidden:)
name:UIKeyboardDidHideNotification object:nil];
    
}

- (void) keyboardWasShown:(NSNotification *) notif
{
   
NSDictionary *info = [notif userInfo];
  
 
    NSValue *value = [info
objectForKey:UIKeyboardFrameEndUserInfoKey];
  
 
    CGSize keyboardSize = [value
CGRectValue].size;
   
   
_nameField.frame=CGRectMake(5,
self.view.frame.size.height-keyboardSize.height-30, 155,
30);
    _sexField.frame=CGRectMake(160,
self.view.frame.size.height-keyboardSize.height-30, 155, 30);
}

- (void) keyboardWasHidden:(NSNotification *)
notif
{
    NSDictionary *info = [notif
userInfo];
    
    NSValue *value = [info
objectForKey:UIKeyboardFrameBeginUserInfoKey];
  
 
    CGSize keyboardSize = [value
CGRectValue].size;
    
   
NSLog(@"keyboardWasHidden keyBoard:%f", keyboardSize.height);
  
 
    // keyboardWasShown = NO;
   
_nameField.frame=CGRectMake(5, 269, 155, 30);
   
_sexField.frame=CGRectMake(160, 269, 155, 30);
}

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