在init方法里注册这两个通知

    [[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardwasShown:) name:UIKeyboardDidShowNotificationobject:nil];

    [[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardwasHidden:) name:UIKeyboardDidHideNotificationobject:nil];

别忘了在dealloc里移除通知中心

[[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardDidShowNotification object:nil];    [[NSNotificationCenter defaultCenter]removeObserver:self name:UIKeyboardDidHideNotification object:nil];

下面是通知调用的两个方法，这里的两个通知中心只需要注册，不需要发送消息。

-(void)keyboardwasShown:(NSNotification *) notify{        NSTimeInterval animationDuration = 0.15f;    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:animationDuration];    [UIView setAnimationCurve:UIViewAnimationCurveLinear];        CGRect frame = self.frame;                frame.origin.y -=216;//216是iphone键盘高，ipad是352，也可以自定义上移的高度        frame.size.height +=216;        self.frame = frame;    [UIView commitAnimations];    }-(void) keyboardwasHidden:(NSNotification *) notify{    if (height == 0) {        return ;    }else{    NSTimeInterval animationDuration = 0.15f;        [UIView beginAnimations:nil context:nil];        [UIView setAnimationDuration:animationDuration];        [UIView setAnimationCurve:UIViewAnimationCurveLinear];    CGRect frame = self.frame;            frame.origin.y +=216;            frame.size.height -=216;     self.frame = frame;    [UIView commitAnimations];        height = 0;    }}

下面这个代理方法在编辑的时候触发

- (void)textFieldDidBeginEditing:(UITextField *)textField{        NSlog(@"执行了");}

或者直接用Xib连线也能触发。

下面再介绍一种方便的方法，先铺一个scrollview，在它上面放UITextField，不过要注意，连线的时候要把Editing Did Begin和Editing Did End连到同两个方法上，这样当开始编辑和结束编辑的时候可触发两个不同的方法

下面是这两个方法的实现

- (IBAction)userNameDidBegin:(id)sender {
    //这里添加了一个滚动的动画    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:0.15];//开始编辑的时候，让_scrollView滚到CGPointMake(0, 216);    CGPoint offset = CGPointMake(0, 216);    [_scrollView setContentOffset:offset animated:YES];    [UIView commitAnimations];}- (IBAction)tapInputUserName:(id)sender {    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:0.15];//结束编辑的时候，让_scrollView滚到CGPointMake(0, 0);    CGPoint offset = CGPointMake(0, 0);    [_scrollView setContentOffset:offset animated:YES];    [UIView commitAnimations];}