使用DAKeyboardControl更改uitextview上uitextview的动态高度

Question

在我的项目中，我使用了这个项目：

DAKeyboardControl：https://github.com/danielamitay/DAKeyboardControl

要将带有UIToolbar的UITextView附加到键盘上方，并在取消键盘时用摇摄手势将其移动，现在我无法理解在编辑文本时如何更改UITextView和UIToolbar的高度，要添加UITextView，我使用DAKeyboardControl示例的相同代码，用UITextView更改UITextField。

现在我如何动态地改变文本视图的高度？

Answer 1

将此代码放入viewDidLoad中：

self.toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f,
                                                                     self.view.bounds.size.height-40,
                                                                     self.view.bounds.size.width,
                                                                     40.0f)];
    self.toolBar.barStyle = UIBarStyleBlack;

    self.toolBar.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
    [self.view addSubview:self.toolBar];

    self.textView = [[UITextView alloc] initWithFrame:CGRectMake(10.0f,6.0f,self.toolBar.bounds.size.width - 20.0f - 68.0f,30.0f)];
    self.textView.clipsToBounds = YES;
    self.textView.layer.cornerRadius = 5.0f;
    self.textView.autoresizingMask = UIViewAutoresizingFlexibleWidth;

    [self.textView setKeyboardAppearance:UIKeyboardAppearanceAlert];
    [self.textView setFont:[UIFont tv_LektonRegular:16]];
    [self.textView setDelegate:self];

    [self.toolBar addSubview:self.textView];

    UIButton *sendButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    sendButton.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
    [sendButton setTitle:NSLocalizedString(@"Send", @"") forState:UIControlStateNormal];
    [sendButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [sendButton.titleLabel setFont:[UIFont tv_LektonRegular:18]];
    [sendButton addTarget:self action:@selector(sendComment:) forControlEvents:UIControlEventTouchUpInside];

    sendButton.frame = CGRectMake(self.toolBar.bounds.size.width - 68.0f,
                                  6.0f,
                                  58.0f,
                                  29.0f);
    [self.toolBar addSubview:sendButton];

    self.view.keyboardTriggerOffset = self.toolBar.bounds.size.height;

    __weak CommentActivityViewController* weakSelf = self;

    [self.view addKeyboardPanningWithActionHandler:^(CGRect keyboardFrameInView) {

        CGRect toolBarFrame = weakSelf.toolBar.frame;
        toolBarFrame.origin.y = keyboardFrameInView.origin.y - toolBarFrame.size.height;
        weakSelf.toolBar.frame = toolBarFrame;
    }];

然后：

- (void)textViewDidChange:(UITextView *)textView
{
    [self _updateInputViewFrameWithKeyboardFrame];
}

- (void)_updateInputViewFrameWithKeyboardFrame
{
    // Calculate the height the input view ideally
    // has based on its textview's content
    UITextView *textView = self.textView;

    CGFloat newInputViewHeight;
    if ([NSURLSession class])
    {
        newInputViewHeight = textViewHeight(textView);
    } else {
        newInputViewHeight = self.textView.contentSize.height;
    }

    //10 is the border of the uitoolbar top and bottom
    newInputViewHeight += 10;
    newInputViewHeight = ceilf(newInputViewHeight);
    //newInputViewHeight = MIN(maxInputViewHeight, newInputViewHeight);

    // If the new input view height equals the current,
    // nothing has to be changed
    if (self.textView.bounds.size.height == newInputViewHeight) {
        return;
    }
    // If the new input view height is bigger than the view available, do nothing
    if ((self.view.bounds.size.height - self.view.keyboardFrameInView.size.height < newInputViewHeight)) {
        return;
    }

    CGRect inputViewFrame = self.textView.frame;
    inputViewFrame.size.height = newInputViewHeight;
    self.textView.frame = inputViewFrame;

    CGRect toolBarFrame = self.toolBar.frame;
    toolBarFrame.size.height = newInputViewHeight +10;
    toolBarFrame.origin.y = self.view.keyboardFrameInView.origin.y - toolBarFrame.size.height;
    self.toolBar.frame = toolBarFrame;

    self.view.keyboardTriggerOffset = self.toolBar.bounds.size.height;
}

static inline CGFloat textViewHeight(UITextView *textView) {
    NSTextContainer *textContainer = textView.textContainer;
    CGRect textRect =
    [textView.layoutManager usedRectForTextContainer:textContainer];

    CGFloat textViewHeight = textRect.size.height +
    textView.textContainerInset.top + textView.textContainerInset.bottom;

    return textViewHeight;
}

此代码适用于iOS 7及更高版本..。

Answer 2

简单地说：

CGRect textViewFrame = textView.frame;
textViewFrame.size.height = 200;// Or whatever you want, basically do your dynamic calculation before and assign the value here
textView.frame = textViewFrame;

如果您希望通过动画方式调整其大小，请将其嵌入到视图动画块中，如下所示：

   [UIView animateWithDuration:0.2 animations:^{
         CGRect textViewFrame = textView.frame;
         textViewFrame.size.height = 200;// Or whatever you want, basically do your dynamic calculation before and assign the value here
         textView.frame = textViewFrame;
 }];

Answer 3

使用addKeyboardPanningWithActionHandler:actionHandler方法的DAKeyboardControl。在处理程序块中，添加您的代码，以便在用户处理键盘时动态地更改框架。您可能希望将keyboardTriggerOffset设置为允许当触摸到达textView的帧时进行摇摄。

这里的优点是，即使键盘没有出现/通过平移消失，帧也会相应地调整大小，因为这个块是为键盘帧中的所有更改调用的。

样本代码：

[self.view addKeyboardPanningWithActionHandler:^(CGRect keyboardFrameInView) {

    CGRect textViewFrame = myTextView.frame;
    textViewFrame.size.height = keyboardFrameInView.origin.y;
    myTextView.frame = textViewFrame;
}];

只是一个示例，您可能需要在指定高度的行中进行一些加/减，以正确地调整textView的大小。