iPhone SDK：TextView，横向模式下的键盘

Posted 2023-02-27

【中文标题】iPhone SDK：TextView，横向模式下的键盘

【英文标题】：iPhone SDK: TextView, Keyboard in Landscape mode

【发布时间】：2010-05-14 16:39:27

【问题描述】：

如何确保在横向显示文本视图并且键盘不会遮挡文本视图。

使用 UICatalog 我创建了一个可以工作的 TextViewController。其中有两种方法可以调用键盘并确保 textView 位于键盘上方。他在人像模式下效果很好。

我让横向模式工作，但 textView 仍然被放在 iPhone 的顶部，以补偿纵向模式下的键盘。

我更改了显示键盘的方法。

下面是这个方法的代码：（我只是让我们看看显示的代码，因为隐藏代码是相反的..

- (void)keyboardWillShow:(NSNotification *)aNotification 

 UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
 if (orientation == UIInterfaceOrientationPortrait) 
   // the keyboard is showing so resize the table's height
  CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue];
  NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  CGRect frame = self.view.frame;
  frame.size.height -= keyboardRect.size.height;
  [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
  [UIView setAnimationDuration:animationDuration];
  self.view.frame = frame;
  [UIView commitAnimations];
  else if (orientation == UIInterfaceOrientationLandscapeLeft) 
  NSLog(@"Left"); // Verijderen later
  CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue];
  NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  CGRect frame = self.view.frame;
  frame.size.width -= keyboardRect.size.height;
  [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
  [UIView setAnimationDuration:animationDuration];
  self.view.frame = frame;
  [UIView commitAnimations];
  else if (orientation == UIInterfaceOrientationLandscapeRight)
  NSLog(@"Right"); // verwijderen later.
  CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue];
  NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
  CGRect frame = self.view.frame;
  frame.size.width -= keyboardRect.size.width;
  [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
  [UIView setAnimationDuration:animationDuration];
  self.view.frame = frame;
  [UIView commitAnimations];
 

我知道我必须更改 frame.size.height -= keyboardRect.size.height 行，但我似乎无法正常工作。

我尝试了frame.size.width -= keyboardRect.size.height，但没有成功。丢失keyboardRect和frame一起工作，但是键盘会遮蔽textview........

【参考方案1】：

我发现上面的代码在 iPad 的横向模式下不起作用

注意：我正在移动所有字段，就我而言，这就是我所需要的 :-)

- (void)keyboardWillShow:(NSNotification*)aNotification 
// Only do for Landscape Mode

    if (UIInterfaceOrientationIsLandscape([self interfaceOrientation]))
        NSDictionary *info = [aNotification userInfo];
        NSValue *aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
        CGSize keyboardSize = [aValue CGRectValue].size;

        NSTimeInterval animationDuration = 0.300000011920929;
        CGRect frame = self.view.frame;
        frame.origin.x -= keyboardSize.height-44;
        frame.origin.y -= keyboardSize.height-44;
        frame.size.height += keyboardSize.height-44;
        [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
        [UIView setAnimationDuration:animationDuration];
        self.view.frame = frame;
        [UIView commitAnimations];

        viewMoved = YES;
    
    keyboardInUse = YES;


- (void)keyboardWillHide:(NSNotification*)aNotification 
    if (UIInterfaceOrientationIsLandscape([self interfaceOrientation]))
        if (viewMoved) 

            NSDictionary *info = [aNotification userInfo];
            NSValue *aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey];
            CGSize keyboardSize = [aValue CGRectValue].size;

            NSTimeInterval animationDuration = 0.300000011920929;
            CGRect frame = self.view.frame;
            frame.origin.y += keyboardSize.height-44;
            frame.origin.x += keyboardSize.height-44;
            frame.size.height -= keyboardSize.height-44;
            [UIView beginAnimations:@"ResizeForKeyboard" context:nil];
            [UIView setAnimationDuration:animationDuration];
            self.view.frame = frame;
            [UIView commitAnimations];

            viewMoved = NO;
        
    
    keyboardInUse = NO;

【参考方案2】：

如果您认为针对不同的方向需要不同的代码，那您就做错了。一旦方向改变并且您的 superview 做出响应，需要改变的值应该始终是框架的高度。

【讨论】：

如果这是真的为什么这个代码：CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue]; NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]; CGRect frame = self.view.frame; frame.size.height -= 键盘矩形.size.height; [UIView beginAnimations:@"ResizeForKeyboard" context:nil]; [UIView setAnimationDuration:animationDuration]; self.view.frame = 框架； [UIView 提交动画];导致视图在横向模式下向右移动？

【参考方案3】：

这是我用于此目的的代码。它适用于 iPad 和 iPhone 是横向和纵向模式（灵感来自 Apple 文档中的代码）：

// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(keyboardWasShown:)
                                             name:UIKeyboardDidShowNotification object:nil];

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



// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification

NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

float offset;
if UIInterfaceOrientationIsPortrait(self.interfaceOrientation)
    offset = kbSize.height;
else
    offset = kbSize.width;

[UIView animateWithDuration:0.5
                 animations:^
                     CGRect frameTxtField = myTextField.frame;
                     frameTxtField.origin.y -= offset;
                     myTextField.frame = frameTxtField;
                 
 ];  



// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification

NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

float offset;
if UIInterfaceOrientationIsPortrait(self.interfaceOrientation)
    offset = kbSize.height;
else
    offset = kbSize.width;

[UIView animateWithDuration:0.5
                 animations:^
                     CGRect frameTxtField = myTextField.frame;
                     frameTxtField.origin.y += offset;
                     myTextField.frame = frameTxtField;
                 
 ];  

不要忘记调用 registerForKeyboardNotifications 方法（例如，在 viewDidLoad 中）。