1

我有一个 UIViewController,我有一个 UIScrollView,里面有几个 UITextFields。我从苹果那里得到了一段代码,它似乎从键盘下方移动了内容。

- (void)keyboardWasShown:(NSNotification *)notification
{
    // Step 1: Get the size of the keyboard.
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    // Step 2: Adjust the bottom content inset of your scroll view by the keyboard height.
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0);
    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;
    // Step 3: Scroll the target text field into view.
    CGRect aRect = self.view.frame;
    aRect.size.height -= keyboardSize.height;
    if (!CGRectContainsPoint(aRect, self.firstResponder.frame.origin) ) {
        CGPoint scrollPoint = CGPointMake(0.0, self.firstResponder.frame.origin.y - (keyboardSize.height-10));
        [self.scrollView setContentOffset:scrollPoint animated:YES];
    }
}

我的 UIScrollView 是 320x416,因为我有一个导航栏。我的键盘也多了 44 个像素,因为我正在向它添加 UIToolBar,所以代码并没有真正工作。我尝试了各种配置来解决两个问题:

  1. 最后两个字段被 UIToolBar + 键盘覆盖,但只有最后一个触发 UIScrollView 移动。
  2. 除了 UIScrollView 正在移动之外,由于 UIToolBar,UITextField 仍然位于键盘后面。

更新:这行得通,但我很确定是错的,如果是对的,我不知道为什么,对我来说没有意义。有人可以修复/解释吗?

- (void)keyboardWasShown:(NSNotification *)notification
{
    // Step 1: Get the size of the keyboard.
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    // Step 2: Adjust the bottom content inset of your scroll view by the keyboard height.
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height + 44.0f, 0.0);
    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;
    // Step 3: Scroll the target text field into view.
    CGRect aRect = self.view.frame;
   aRect.size.height -= keyboardSize.height + 44.0f;
    if (!CGRectContainsPoint(aRect, self.firstResponder.frame.origin) ) {
        CGPoint scrollPoint = CGPointMake(0.0, self.firstResponder.frame.origin.y - (keyboardSize.height-10.0f - 44.0f - 44.0f - 44.0f));
        [self.scrollView setContentOffset:scrollPoint animated:YES];
    }
}

UPDATE1:还有另一个错误,我在 UIToolBar 中有一个上一个按钮,如果我点击最后一个文本字段,滚动视图上升,如果我移回第一个文本视图,它在视图之外,因为滚动视图不会滚下来。

4

3 回答 3

1

尝试将工具栏高度也添加到计算中,

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height + 44.0f, 0.0);

还制作,

aRect.size.height = aRect.size.height - keyboardSize.height - 44.0f;
于 2012-10-12T03:59:41.667 回答
1

我尝试了您在编辑部分中使用的相同方法,但对 if 条件进行了轻微更改:

!CGRectContainsRect(aRect, self.firstResponder.frame)

这可能会帮助您解决仅原点位于键盘上方但文本字段被覆盖的问题。

于 2012-10-14T02:54:40.610 回答
0

在尝试了很多解决问题的苹果解决方案之后,我最终在描绘了苹果代码背后的一般想法之后自己编写了一些代码。顺便说一句,我认为苹果代码使问题复杂化并且实际上不起作用。

- (void)textFieldDidBeginEditing:(UITextField*)textField {

    self.firstResponder = textField;

    if (self.firstResponder.frame.origin.y + self.firstResponder.frame.size.height > self.view.bounds.size.height - (216 + 44)) {

        double fix = (self.firstResponder.frame.origin.y + self.firstResponder.frame.size.height) - (self.view.bounds.size.height - (216 + 44)) + 10;

        CGRect rect = CGRectMake(0, -fix, self.view.frame.size.width, self.view.frame.size.height);

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        self.view.frame = rect;
        [UIView commitAnimations];

    } else if (self.firstResponder.frame.origin.y + 10 < -self.view.frame.origin.y) {

        double fix =  -self.view.frame.origin.y - (-self.view.frame.origin.y - self.firstResponder.frame.origin.y) - 10;

        CGRect rect = CGRectMake(0, -fix, self.view.frame.size.width, self.view.frame.size.height);

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:0.3];
        self.view.frame = rect;
        [UIView commitAnimations];

    }

}
于 2012-10-12T22:12:24.563 回答