Objective c 在iOS7中显示键盘时调整UITextView的大小

这个问题已经被问了好几次了，但我真的找不到答案

在iOS6中，每当键盘出现时，我都使用以下命令来调整UITextView的大小。在iOS7下，行为并不像它应该的那样（在我的例子中，似乎没有任何东西在调整大小）。我怀疑原因是iOS7的自动布局/约束行为。有什么建议吗？（“记事本”是我的UITextView）

---

当键盘出现时，需要调整UITextView的大小。 看看我之前的回答。 根据键盘和文本的宽度，需要调用以下方法来调整UITextView的大小：

- (CGFloat)textViewHeightForAttributedText:(NSAttributedString*)text andWidth:(CGFloat)width
{
    UITextView *calculationView = [[UITextView alloc] init];
    [calculationView setAttributedText:text];
    CGSize size = [calculationView sizeThatFits:CGSizeMake(width, FLT_MAX)];
    return size.height;
}

您使用我的方法编写的代码：

- (void)keyboardWasShown:(NSNotification*)aNotification 
{ 
    NSDictionary* info = [aNotification userInfo]; 
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    // Get your text to NSAttributedString 
    NSAttributedString *as = [[NSAttributedString alloc] initWithString:self.notePad.text];

    // Resize UITextView
    self.notePad.frame = CGRectMake(0, 0, CGRectGetWidth(self.notePad.frame), [self textViewHeightForAttributedText:as andWidth:kbSize.width)]);
}

---

我发现我必须调用

[self layoutifneed]

才能使插入生效

我的键盘通知方法如下所示（我更喜欢设置更改的动画）：

---

如果在视图中使用自动布局，以下方法可能会对您有所帮助

首先为底部布局指南约束定义一个IBOutlet，并链接到情节提要元素

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *textViewBottomConst;

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *textViewBottomConst;

第二，为键盘通知添加观察员

- (void)observeKeyboard {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)observeKeyboard {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

最后是处理键盘更改的方法

- (void)keyboardWillShow:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];
    NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardFrame = [kbFrame CGRectValue];

    CGRect finalKeyboardFrame = [self.view convertRect:keyboardFrame fromView:self.view.window];

    int kbHeight = finalKeyboardFrame.size.height;

    int height = kbHeight + self.textViewBottomConst.constant;

    self.textViewBottomConst.constant = height;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    self.textViewBottomConst.constant = 10;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

- (void)keyboardWillShow:(NSNotification *)notification {
//THIS WILL MAKE SURE KEYBOARD DOESNT JUMP WHEN OPENING QUICKTYPE/EMOJI OR OTHER KEYBOARDS.
kbHeight = 0;
height = 0;
self.textViewBottomConst.constant = height;
self.btnViewBottomConst.constant = height;

    NSDictionary *info = [notification userInfo];
    NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardFrame = [kbFrame CGRectValue];

    CGRect finalKeyboardFrame = [self.view convertRect:keyboardFrame fromView:self.view.window];

    int kbHeight = finalKeyboardFrame.size.height;

    int height = kbHeight + self.textViewBottomConst.constant;

    self.textViewBottomConst.constant = height;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    self.textViewBottomConst.constant = 10;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

---

此方法支持方向更改和不同的键盘大小。希望有帮助。

我已经为此奋斗了一周，我发现将键盘大小的高度添加到底部

contentInset

不起作用

有效的方法是从顶部减去它，就像这样：

UIEdgeInsets insets = UIEdgeInsetsMake(-(kbSize.height), 0.0, 0.0, 0.0);
[self.textView setContentInset:insets];

---

您的代码在逻辑上是正确的。当键盘出现时，您几乎不应该使用scrollview行为更改对象的帧，而应该只更改插入。 插图应该相对于当前版本更改，因为iOS7负责调整导航栏。若你们提供了一个新的插图，你们可能会破坏UI中的一些东西。 您的代码在iOS7上被破坏主要有两个原因：

必须向textview容器添加自动布局约束。（可能您的文本视图比您预期的要大）

您不应该以绝对方式更改插图

以下是正确配置文本视图的步骤：

• 在xib（或故事板）中，将约束添加到容器的顶部、左侧、右侧和底部（在我的示例中为{0,0,0,0}），如下所示

• 注册键盘通知

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

• 在

  中，键盘将显示

  和

  键盘将隐藏

  不更改帧，而是相对于现有帧更改插入

  - (void)keyboardWillShow:(NSNotification *)notification
  {
      // Take frame with key: UIKeyboardFrameEndUserInfoKey because we want the final frame not the begin one
      NSValue *keyboardFrameValue = [notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];
      CGRect keyboardFrame = [keyboardFrameValue CGRectValue];
  
      UIEdgeInsets contentInsets = self.textView.contentInset;
      contentInsets.bottom = CGRectGetHeight(keyboardFrame);
  
      self.textView.contentInset = contentInsets;
      self.textView.scrollIndicatorInsets = contentInsets;
  }
  
  - (void)keyboardWillHide:(NSNotification *)notification
  {
      UIEdgeInsets contentInsets = self.textView.contentInset;
      contentInsets.bottom = .0;
  
      self.textView.contentInset = contentInsets;
      self.textView.scrollIndicatorInsets = contentInsets;
  }
  

  • 然后记得移除观察员

---

@BoranA有正确答案，但需要调整所有键盘的全部功能
请遵循以下代码：
将下面的内容附加到您的

垂直空间-底部布局指南-TextField

第二，为键盘通知添加观察员

- (void)observeKeyboard {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)observeKeyboard {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
}

将此添加到viewDidLoad

[self observeKeyboard]; 

最后是处理键盘更改的方法

- (void)keyboardWillShow:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];
    NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardFrame = [kbFrame CGRectValue];

    CGRect finalKeyboardFrame = [self.view convertRect:keyboardFrame fromView:self.view.window];

    int kbHeight = finalKeyboardFrame.size.height;

    int height = kbHeight + self.textViewBottomConst.constant;

    self.textViewBottomConst.constant = height;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    self.textViewBottomConst.constant = 10;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

- (void)keyboardWillShow:(NSNotification *)notification {
//THIS WILL MAKE SURE KEYBOARD DOESNT JUMP WHEN OPENING QUICKTYPE/EMOJI OR OTHER KEYBOARDS.
kbHeight = 0;
height = 0;
self.textViewBottomConst.constant = height;
self.btnViewBottomConst.constant = height;

    NSDictionary *info = [notification userInfo];
    NSValue *kbFrame = [info objectForKey:UIKeyboardFrameEndUserInfoKey];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    CGRect keyboardFrame = [kbFrame CGRectValue];

    CGRect finalKeyboardFrame = [self.view convertRect:keyboardFrame fromView:self.view.window];

    int kbHeight = finalKeyboardFrame.size.height;

    int height = kbHeight + self.textViewBottomConst.constant;

    self.textViewBottomConst.constant = height;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

- (void)keyboardWillHide:(NSNotification *)notification {
    NSDictionary *info = [notification userInfo];

    NSTimeInterval animationDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    self.textViewBottomConst.constant = 10;

    [UIView animateWithDuration:animationDuration animations:^{
        [self.view layoutIfNeeded];
    }];
}

---

太好了！我使用了tableview/w可编辑单元格。为了获得更令人愉悦的动画效果，这段代码从键盘上提取参数显示/隐藏动画：NSTimeInterval duration=[notif.userInfo[UIKeyboardAnimationDurationUserInfoKey]doubleValue]；UIViewAnimationCurve=[notif.userInfo[UIKeyboardAnimationCurveUserInfoKey]unsignedIntegerValue]；UIViewAnimationOptions options=（曲线谢谢你，BoranA！它很清晰，工作起来很有魅力！UIKeyboardDidChangeFrameNotification应该有一个操作，因为用户可以在键盘显示时更改输入语言。这非常有用，非常感谢！记得添加

[自观察键盘]

要使其工作，请单击viewDidLoad！这不考虑插入符号的当前位置。