ios - 带有 keyboardWillShow 的 UITableView 和 UIView

Question

我有一个 UITableView，它几乎填满了我的整个 UIViewController，我在底部有一个 UIView，其中包含一个按钮和一个文本字段。

当我点击文本字段时，我希望 UIView 和 tableview 向上推，这样 UIView 就在键盘的顶部。

- UIView:  
  - UITextField
  - UIButton

我在这里尝试了多种建议，但似乎没有一种适合我的情况。

Answer 1

第一步:
制作UIView

底部约束的outlet

第 2 步:
添加键盘显示和隐藏的观察者，然后根据键盘高度更改约束常量..

//**In viewDidLoad method** 

    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardWillShowNotification 
                                               object:nil];
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillHide:) 
                                                 name:UIKeyboardWillHideNotification 
                                               object:nil];  

Swift 5 中的第 2 步:

//**In viewDidLoad method** 

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)

第 3 步:
在键盘显示和隐藏通知时管理约束，如下所示

- (void)keyboardWillShow:(NSNotification *)notification
{

    NSDictionary* userInfo = [notification userInfo];

   // get the size of the keyboard
   CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

   CGSize keyboardSizeNew = [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;

   _bottomConstraintofView.constant = keyboardSizeNew.height;

  [UIView animateWithDuration:0.2
    animations:^{
        [self.view layoutIfNeeded]; // Called on parent view
    }];
 }

- (void)keyboardWillHide:(NSNotification *)notification
{
     _bottomConstraintofView.constant = 0;
    [UIView animateWithDuration:0.2
    animations:^{
        [self.view layoutIfNeeded]; 
    }];
}  

---

Swift 中的解决方案

func keyboardWillShow(notification: NSNotification){
    let userInfo:NSDictionary = notification.userInfo!
    let keyboardSize:CGSize = userInfo.objectForKey(UIKeyboardFrameBeginUserInfoKey)!.CGRectValue().size
    
    let keyboardSizeNow:CGSize = userInfo.objectForKey(UIKeyboardFrameEndUserInfoKey)!.CGRectValue().size

    self.bottomConstraintofView.constant = keyboardSizeNow.height
    UIView.animateWithDuration(0.2) {  
        self.view.layoutIfNeeded()
    }
}

func keyboardWillHide(notification: NSNotification){
    bottomConstraintofView.constant = 0
    UIView.animateWithDuration(0.2) {
        self.view.layoutIfNeeded()
    }
}