保持键盘下方的内容

时间:2012-10-12 03:49:07

标签: objective-c ios xcode cocoa-touch

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似乎从键盘下方移动内容的代码。

- (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。我的键盘还有44个像素,因为我正在添加一个UIToolBar,所以代码并没有真正起作用。我尝试了各种配置来解决两个问题:

  1. 最后两个字段由UIToolBar +键盘覆盖,但只有最后一个字段触发UIScrollView移动。
  2. 除了UIScrollView正在移动之外,由于UIToolBar,UITextField仍然在键盘后面。
  3. 更新:这有效,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。有人可以解决/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,滚动视图会上升,如果我移回第一个文本视图,它位于视图之外,因为滚动视图不会向下滚动。

3 个答案:

答案 0 :(得分:1)

尝试将工具栏高度添加到计算中,

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

也是,

aRect.size.height = aRect.size.height - keyboardSize.height - 44.0f;

答案 1 :(得分:1)

我尝试过与编辑部分相同的方法,但对if条件略有改动:

!CGRectContainsRect(aRect, self.firstResponder.frame)

这可能有助于您解决只有原点位于键盘上方的问题,但文本字段已被覆盖。

答案 2 :(得分:0)

在尝试了很多修复苹果解决方案的问题后,我在描绘了苹果代码背后的一般概念之后,最终自己编写了一些代码。顺便说一下,我认为苹果代码使问题复杂化并且实际上并不起作用。

- (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];

    }

}