iPhone - 当键盘出现时如何滚动 UITextField 并调整 UITextView 的大小

Question

我有一个 UIScrollView，其中有一个 UITextField 和一个 UITextView。 我想防止键盘隐藏我们正在处理的字段。 如果我的用户点击文本字段，我希望它滚动到屏幕顶部。 如果我的用户点击 TextView，我希望它调整大小到键盘顶部左侧的空白位置。 我的键盘有一个附件视图（工具栏）。

现在，我捕获了 UIKeyboardWillShowNotification 通知，并使用了这段代码，但它实际上不起作用（文本视图已调整大小，但仍在键盘后面）： 当我没有 UIScrollView 时，这段代码运行良好。

- (void)keyboardWillShow:(NSNotification *)notification {

    if ([self.noteView isFirstResponder] == NO) return;

    /*
     Reduce the size of the text view so that it's not obscured by the keyboard.
     Animate the resize so that it's in sync with the appearance of the keyboard.
     */

    NSDictionary *userInfo = [notification userInfo];
    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];                            // Get the origin of the keyboard when it's displayed.
    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];   // Get the duration of the animation.

    // Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.
    CGRect keyboardRect = [aValue CGRectValue];
    keyboardRect = [self.view convertRect:keyboardRect fromView:nil];

    CGFloat keyboardTop = keyboardRect.origin.y;
    CGRect newTextViewFrame = self.view.bounds;
    newTextViewFrame.size.height = keyboardTop - self.view.frame.origin.y; // Using bounds here does not help

    NSTimeInterval animationDuration;
    [animationDurationValue getValue:&animationDuration];

    // Animate the resize of the text view's frame in sync with the keyboard's appearance.
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:animationDuration];

     self.noteView.frame = newTextViewFrame;

    [UIView commitAnimations];
}

那么你能帮我：

• 使这个适用于文本视图吗？

• 让Textview回到原来的位置？

• 如何在没有任何调整大小功能的情况下滚动 TextField？

谢谢

Answer 1

您可以使用以下方式以编程方式滚动 uiscrollview：

- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated

不确定这是否适用于您的应用程序。