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当键盘覆盖文本字段时，我使用代码使屏幕滚动。

我有一个文本字段列表，我开始将每个文本字段放在自己的 uiview 中，以用于样式和组织目的。

现在我的代码只有在我开始实际输入文本字段时才有效。这是我从苹果复制的怪物。注意：我向 registerForKeyboardNotifications 添加了一个参数，以便我可以将其包含在父类中并从任何地方调用它

  // Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications:(UIScrollView *)scroll
{
    _scroller = scroll;

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillBeHidden:)
                                                 name:UIKeyboardWillHideNotification object:nil];
}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSLog(@"hey");
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    _scroller.contentInset = contentInsets;
    _scroller.scrollIndicatorInsets = contentInsets;

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your application might not need or want this behavior.
    CGRect aRect = self.view.frame;
    aRect.size.height -= kbSize.height;
    if (!CGRectContainsPoint(aRect, _activeField.frame.origin) ) {
        CGPoint scrollPoint = CGPointMake(0.0, _activeField.frame.origin.y-kbSize.height);
        [_scroller setContentOffset:scrollPoint animated:YES];
    }
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    _scroller.contentInset = contentInsets;
    _scroller.scrollIndicatorInsets = contentInsets;
}

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

    _activeField = textField;
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    _activeField = nil;
}

我已将问题缩小到视图控制器中的这一部分

    for (id subView in _tpnScroll.subviews)
{

    if ([subView isKindOfClass:[UIView class]]) {
        UIView *thisView = subView;
        for(id textfield in thisView.subviews){
            if([textfield isKindOfClass:[UITextField class]]){
                [textfield setDelegate:self];
            }
        }
    }
}

原始代码是

    for (id subView in _tpnScroll.subviews){
    if ([subView isKindOfClass:[UITextField class]]) {
        [subView setDelegate:self];
    }
}

在第一个例子中。我遍历我的 UIViews，找到 UITextfields，并将委托设置为 self（这部分我不完全理解，仍在尝试理解委托的概念）

在第二个示例中，文本字段直接位于滚动视图上，因此我直接循环浏览它们。

对不起，如果这很罗嗦。

4

1 回答 1

0

尝试用这个替换keyboardWasShown。

- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSLog(@"hey");
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    _scroller.contentInset = contentInsets;
    _scroller.scrollIndicatorInsets = contentInsets;

    // the scroll view will only scroll if the text field is not fully visible
    // no need to check if it is actually covered
    [_scroller scrollRectToVisible:[_scroller convertRect:_activeField.bounds fromView:_activeField]
                        animated:YES];
}

将文本字段的边界转换为滚动视图的坐标系可以确保即使文本字段不在滚动视图内部，它也能正常工作。

于 2013-07-12T23:58:56.180 回答