键盘遮挡住输入框的问题

注册键盘弹起与收起通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

-(void)keyboardWillShow:(NSNotification *)note{
    NSDictionary *info = [note userInfo];
    CGSize keyboardSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    _keyBoardHeight = keyboardSize.height;
    CGRect frame = _colorText.frame;
    int offset = frame.origin.y + 32 - (self.view.frame.size.height -_keyBoardHeight);
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    //将视图的Y坐标向上移动offset个单位，以使下面腾出地方用于软键盘的显示
    if(offset > 0){
        self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);
    }
    [UIView commitAnimations];
}

//点击return或者回车键键盘消失

-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}

//输入完成后恢复视图
-(void)textFieldDidEndEditing:(UITextField *)textField{
    NSTimeInterval animationDuration = 0.30f;
    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
    [UIView setAnimationDuration:animationDuration];
    self.view.frame =CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    [UIView commitAnimations];
}