Question

当键盘被隐藏时，scrollview应该返回到它的原始contentInset，但它在iOS7中不起作用。设置scrollview的contentInset时显示键盘工作但键盘隐藏时，scrollview的contentInset不能设置为插入零。代码：

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:Nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];
}

- (void)keyboardWasShown:(NSNotification *)notif
{
    CGSize keyboardSize = [[[notif userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0, 0, keyboardSize.height, 0);


    UIScrollView *scrollView = (UIScrollView *)self.view;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    CGRect rect = self.view.frame;
    rect.size.height -= keyboardSize.height;
    if (!CGRectContainsPoint(rect, self.wishContentField.frame.origin)) {
        CGPoint point = CGPointMake(0, self.wishContentField.frame.origin.y - keyboardSize.height);
        [scrollView setContentOffset:point animated:YES];
    }

}
- (void)keyboardWasHidden:(NSNotification *)notif
{
    UIEdgeInsets zeroInsets = UIEdgeInsetsZero;
    UIScrollView *scrollView = (UIScrollView *)self.view;
    [scrollView setContentInset:zeroInsets];
    scrollView.scrollIndicatorInsets = zeroInsets;
}

Answer 1

试试这个：

self.automaticallyAdjustsScrollViewInsets = NO;

这对我有用......

Answer 2

它可能与contentSize不起作用有关除了在VC中设置

- (void)viewDidLayoutSubviews
{
     self.scrollView.contentSize = whatever
}

只是说你可能会把头撞到错误的墙上

Answer 3

所以，仅仅因为我仍然觉得这个答案很有用，这就是我所做的。我接受了@ alex-i的建议和@ yong-ho的评论。但由于某种原因，导航栏的高度还不够。

UIEdgeInsets contentInsets = UIEdgeInsetsMake(self.navigationController.navigationBar.frame.size.height + 20.0f, 0.0, 0.0, 0.0); 
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;

就像我说的，我必须添加20.0f或我的内容仍然被切断。不知道为什么。如果我弄清楚，我会更新我的答案。

Answer 4

将contentOffset设置为零。无论您的滚动视图位于导航控制器内还是其他任何位置，它都适用于所有情况。在下面找到相同的代码段：

- (void)keyboardWasHidden:(NSNotification *)notif
{    
    UIScrollView *scrollView = (UIScrollView *)self.view;
    scrollView.contentOffset = CGPoint.zero
}

Answer 5

我还发现，如果将新的contentinset设置为与现有inset完全相同，则滚动视图可能会忽略它并将其恢复为零inset。因此，一种简单的解决方法是检查您要设置的新contentinset与上一个至少有1分不同。

iOS7 UIScrollView contentInset不起作用

5 个答案: