示例代码

 //添加到- (void)viewDidLoad
 // 键盘出现 视图上移事件
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillAppear:) name:UIKeyboardWillShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillDisAppear:) name:UIKeyboardWillHideNotification object:nil];

// 键盘出现 视图上移事件
- (void)keyboardWillDisAppear:(NSNotification *)notification{
    [UIView animateWithDuration:1 animations:^{self.view.transform = CGAffineTransformMakeTranslation(0, 0);}];
}

- (void)keyboardWillAppear:(NSNotification *)notification{
    CGRect keyboardFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat keyboardY = keyboardFrame.origin.y;
    [UIView animateWithDuration:1.0 animations:^{self.view.transform = CGAffineTransformMakeTranslation(0, keyboardY - self.view.frame.size.height);}];
}

//点击空白处，收回键盘
//需要self.View没有被别的控件挡住
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self.view endEditing:YES];
}

//点击键盘上的return，收回键盘
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    // 必须辞去第一响应者后,键盘才会回缩.
    [textField resignFirstResponder];
    return YES;
}

讲解

1. 实现最后一个点击return收回键盘。需要添加协议
2. keyboardY - self.view.frame.size.height这个是实际上移参数，可以根据需要进行修改