键盘出现时滚动 UItextfield

Question

我有一个UIView，它作为子视图添加到UIScrollView，UIView 包含UITextField 和UITextView，以避免键盘隐藏我为keyboardWasShown 和@987654328 注册的字段@通知，我写了这段代码

- (void)keyboardWasShown:(NSNotification *)notification
{
    isKeyboardUp = YES;

    // 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;

    CGRect TextFieldFrame;
    if(activeTextField)
    {
        TextFieldFrame = [activeTextField.superview convertRect:activeTextField.frame toView:self.view];
    }
    else
    {
        TextFieldFrame = [activeTextView.superview convertRect:activeTextView.frame toView:self.view];
    }

   [self.scrollView scrollRectToVisible:TextFieldFrame animated:YES];
}

- (void) keyboardWillHide:(NSNotification *)notification
{
    isKeyboardUp = NO;
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;
}

这里的activeTextField 和activeTextView 是当前使用的文本字段，这在大多数情况下都很好用，但在少数情况下会失败，如果实施有什么问题，有人可以提出建议。

Answer 1

是的，如果您使用的是滚动视图，那么您可以简单地使用TPKEYBOARDTYPING 它可以在可可豆荚上使用，或者您可以从 github 它自己获取它。 添加其文件，然后只需转到您的故事板并在滚动视图中将其类更改为 tpkeyboardtypingscrollview。

它会在返回时提供所有必要的东西，比如 Resign 键盘，并会改变 scrollView 本身的偏移量，这样你的 textFields 就不会隐藏在你的键盘后面。

Answer 2

试试这个

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

NSDictionary *info = [notification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
keyboardHeight = kbSize.height;
[self updateScrollViewPosition];
}

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

NSDictionary *info = [notification userInfo];
CGSize kbSizeBegin = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
CGSize kbSizeEnd = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
if (kbSizeBegin.height != kbSizeEnd.height) {
    keyboardHeight = kbSizeEnd.height;
    if (activeTextField && [activeTextField isFirstResponder]) {
        [self updateScrollViewPosition];
    }
}
}

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

keyboardHeight = 0;
activeTextField = nil;
[self resignAllTextFields];
} 

#pragma mark - UITextFieldDelegate Methods

 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
activeTextField = textField;
return YES;
}

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

activeTextField = textField;
[self updateScrollViewPosition];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

keyboardHeight = 0;
activeTextField = nil;
[textField resignFirstResponder];
return YES;
 }

#pragma mark - Update Method

-(void)updateScrollViewPosition {

if (keyboardHeight > 0 && activeTextField) {
    CGRect frame = activeTextField.frame;
    CGFloat yPoint = scrollView.frame.origin.y+frame.origin.y+frame.size.height+8.0;
    CGFloat height = self.view.frame.size.height-keyboardHeight;
    CGFloat diff = yPoint-height;
    if (diff > 0.0) {
        [scrollView setContentOffset:CGPointMake(0, diff) animated:YES];
    }
    else {
        CGFloat diff = scrollView.contentSize.height-scrollView.contentOffset.y;
        if (diff<scrollView.frame.size.height) {
            diff = scrollView.contentSize.height-scrollView.frame.size.height;
            if (diff < 0) {
                diff = 0.0;
            }
            [scrollView setContentOffset:CGPointMake(0, diff) animated:YES];
        }
    }
}
else {
    CGFloat diff = scrollView.contentSize.height-scrollView.contentOffset.y;
    if (diff<scrollView.frame.si  ze.height) {
        diff = scrollView.contentSize.height-scrollView.frame.size.height;
        if (diff < 0) {
            diff = 0.0;
        }
        [scrollView setContentOffset:CGPointMake(0, diff) animated:YES];
    }
}
 }

辞职

-(void)resignAllTextFields {

for (UIView *view in containerView.subviews) {
    if ([view isKindOfClass:[UITextField class]]) {
        UITextField *textField = (UITextField*)view;
        [textField resignFirstResponder];
    }
}
[self updateScrollViewPosition];
}