iOS输入框怎样避免键盘的遮挡

//添加通知，来控制键盘和输入框的位置

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardWillShowNotification object:nil];//键盘的弹出

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillBeHidden:) name:UIKeyboardWillHideNotification object:nil];//键盘的消失

#pragma mark ----- 键盘显示的时候的处理

- (void)keyboardWasShown:(NSNotification*)aNotification

{

    //获得键盘的大小

    NSDictionary* info = [aNotification userInfo];

    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

    

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:0.25];

    [UIView setAnimationCurve:7];

    self.scrollViewtwo.frame = CGRectMake(0,-kbSize.height/2+5 , SCREEN_SIZE.width, SCREEN_SIZE.height);

    [UIView commitAnimations];

}

#pragma mark -----    键盘消失的时候的处理

- (void)keyboardWillBeHidden:(NSNotification*)aNotification

{

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:0.25];

    [UIView setAnimationCurve:7];

    self.scrollViewtwo.frame = CGRectMake(0, 0, SCREEN_SIZE.width, SCREEN_SIZE.height);

    self.scrollViewtwo.contentSize = CGSizeMake([UIScreen mainScreen].bounds.size.width,(int)[UIScreenmainScreen].bounds.size.height<=480?568:0);

    [UIView commitAnimations];

}

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