blocks|key|1512954|text|首先，要确保将UISearchBar添加到UITableView的tableHeaderView中，以便它与表的内容一起滚动，而不是固定在视图的顶部。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1512955|搜索栏不会被计入表视图中的一行，所以如果你将表视图的顶部滚动到第一行，它会“隐藏”搜索栏：|1512956|[yourTableView+scrollToRowAtIndexPath:[NSIndexPath+indexPathForRow:0+inSection:0]+atScrollPosition:UITableViewScrollPositionTop+animated:NO];|code-block|syntax|javascript|1512957|或者在Swift中：|1512958|yourTableView.scrollToRowAtIndexPath(NSIndexPath(forRow:+0,+inSection:+0),+atScrollPosition:+UITableViewScrollPosition.Top,+animated:+false)|1512959|确保在包含数据之前不要滚动表视图(如果给定的indexPath没有指向有效行(即如果表视图为空)，scrollToRowAtIndexPath将引发异常)。|offset|length|style|CODE|1512960|entityMap^0|0|0|0|0|0|1D|M|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|Z|8|@$O|10|P|11|Q|R]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

First make sure, to add the UISearchBar to the tableHeaderView of the UITableView so that it gets scrolled with the table's content and isn't fixed to the top of the view.

The searchbar isn't counted as a row in the tableview, so if you scroll the top of the tableview to the first row, it 'hides' the searchbar:

<pre><code>[yourTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
</code></pre>

or in Swift:

<pre><code>yourTableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: UITableViewScrollPosition.Top, animated: false)
</code></pre>

Make sure to not scroll the tableview before it contains data (<code>scrollToRowAtIndexPath</code> will raise an exception if the given indexPath does not point to a valid row (i.e. if the tableview is empty)).

blocks|key|1298266|text|我发现当tableView为空时，“便笺”应用程序无法搜索项目。所以我认为它首先只是使用-(void)addSubview:(UIView+*)view来添加一个空白表。当您将一个项目添加到它的数据源数组中时，它将运行另一段代码来加载tableView。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1298267|所以我的解决方案是：|1298268|if([self.arrayList+count]+>+0)
{
+++++[self.tableView+reloadData];+++++//use+jdandrea's+code+to+scroll+view+when+cell==nil+in+cellForRowAtIndexPath
+++++self.tableView.scrollEnabled+=+YES;
}
else
{
+++++tableBlank+=+[[UITableView+alloc]initWithFrame:CGRectMake(0,0,320,416)+style:UITableViewStylePlain]+autorelease];
+++++tableBlank.delegate+=+self;
+++++tableBlank.dataSource+=+self;
+++++[self.view+addSubview:tableBlank];
}|code-block|syntax|javascript|1298269|希望这能有所帮助:-)|1298270|entityMap^0|18|W|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|V|8|@]|D|@]|E|$]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

I find that the "Notes" app is unable to search items when the tableView is blank. So I think it's just using <code>-(void)addSubview:(UIView *)view</code> to add a blank table at first. When you add an item to its data source array, it will run another peice of code to load tableView.

So my solution is:

<pre><code>if([self.arrayList count] > 0)
{
 [self.tableView reloadData]; //use jdandrea's code to scroll view when cell==nil in cellForRowAtIndexPath
 self.tableView.scrollEnabled = YES;
}
else
{
 tableBlank = [[UITableView alloc]initWithFrame:CGRectMake(0,0,320,416) style:UITableViewStylePlain] autorelease];
 tableBlank.delegate = self;
 tableBlank.dataSource = self;
 [self.view addSubview:tableBlank];
}
</code></pre>

Hope this helps :-)

blocks|key|1513023|text|不要将UISearchBar添加为UITableView的子视图，这是不必要的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1513024|UITableView有一个tableHeaderView属性，非常适合这样做：|1513025|-+(void)+viewDidLoad+{
++++[super+viewDidLoad];+
++++self.searchBar+=+[[[UISearchBar+alloc]+initWithFrame:CGRectMake(0,+0,+320,+44)]+autorelease];
++++self.searchBar.showsCancelButton+=+YES;++++
++++self.searchBar.delegate+=+self;
++++self.tableView.tableHeaderView+=+self.searchBar;+++++
}|code-block|syntax|javascript|1513026|如果您不想默认看到它：|1513027|-+(void)+viewWillAppear:(BOOL)animated+{
++++[super+viewWillAppear:animated];
++++[self.tableView+setContentOffset:CGPointMake(0,+44)];
}|1513028|我还获得了取消按钮，以再次隐藏它...(并移除键盘)|1513029|-+(void)searchBarCancelButtonClicked:(UISearchBar+*)searchBar+{
++++[self.tableView+setContentOffset:CGPointMake(0,+44)+animated:YES];
++++[self.searchBar+resignFirstResponder];
}|1513030|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Dont' add the UISearchBar as a subview of the UITableView, this isn't necessary.

The UITableView has a tableHeaderView property that is perfect for this:

<pre><code>- (void) viewDidLoad {
 [super viewDidLoad]; 
 self.searchBar = [[[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)] autorelease];
 self.searchBar.showsCancelButton = YES; 
 self.searchBar.delegate = self;
 self.tableView.tableHeaderView = self.searchBar; 
}
</code></pre>

If you don't want to see it by default:

<pre><code>- (void) viewWillAppear:(BOOL)animated {
 [super viewWillAppear:animated];
 [self.tableView setContentOffset:CGPointMake(0, 44)];
}
</code></pre>

I also get the cancel button to hide it again.... (and remove the keyboard)

<pre><code>- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
 [self.tableView setContentOffset:CGPointMake(0, 44) animated:YES];
 [self.searchBar resignFirstResponder];
}
</code></pre>

blocks|key|1298330|text|更改tableView的边界，这可以在viewDidLoad中完成，而且您不必担心表是否为空(以避免异常)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1298331|CGRect+newBounds+=+self.tableView.bounds;
newBounds.origin.y+=+newBounds.origin.y+%2B+self.searchBar.bounds.size.height;
self.tableView.bounds+=+newBounds;|code-block|syntax|javascript|1298332|一旦用户向下滚动表格，搜索栏就会出现，并且行为正常|1298333|entityMap^0|J|B|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Change the bounds of the tableView, this can be done inside <code>viewDidLoad</code> plus you don't have to worry about if the table is empty or not (to avoid the exception).

<pre><code>CGRect newBounds = self.tableView.bounds;
newBounds.origin.y = newBounds.origin.y + self.searchBar.bounds.size.height;
self.tableView.bounds = newBounds;
</code></pre>

Once the user has scrolled down the table the search bar will appear and behave normally

blocks|key|1298379|text|请注意，如果表视图中没有数据，则接受的答案将崩溃。在某些情况下，将其添加到viewDidLoad可能不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298380|[yourTableView+scrollToRowAtIndexPath:[NSIndexPath+indexPathForRow:0+inSection:0]+atScrollPosition:UITableViewScrollPositionTop+animated:NO];+//+crashes+if+no+rows/data|code-block|syntax|javascript|1298381|因此，请添加下面这行代码：|1298382|-+(void)viewDidAppear:(BOOL)animated+{
++++[super+viewDidAppear:animated];

++++[yourTableView+setContentOffset:CGPointMake(0,+self.searchDisplayController.searchBar.frame.size.height)];
}|1298383|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Note that the accepted answer will crash if there is no data in the tableview. And adding it to viewDidLoad may not work under certain circumstances.

<pre><code>[yourTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO]; // crashes if no rows/data
</code></pre>

Therefore, instead add this line of code:

<pre><code>- (void)viewDidAppear:(BOOL)animated {
 [super viewDidAppear:animated];

 [yourTableView setContentOffset:CGPointMake(0, self.searchDisplayController.searchBar.frame.size.height)];
}
</code></pre>

blocks|key|1513127|text|老实说，没有一个答案真正解决了这个问题(对我来说)。如果您的表视图没有行或行高不同，这些答案是不够的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1513128|唯一有效的方法是：|1513129|-+(void)viewWillAppear:(BOOL)animated
{
++++[super+viewWillAppear:animated];
++++self.tableView.contentOffset+=+(CGPoint){.y+=++self.tableView.contentOffset.y+%2B+self.searchController.searchBar.frame.size.height};
}|code-block|syntax|javascript|1513130|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Honestly, none of the answers really solved the issue (for me). If your table view has no rows OR the row height is different, these answers don't suffice.

The only thing that works:

<pre><code>- (void)viewWillAppear:(BOOL)animated
{
 [super viewWillAppear:animated];
 self.tableView.contentOffset = (CGPoint){.y = self.tableView.contentOffset.y + self.searchController.searchBar.frame.size.height};
}
</code></pre>

blocks|key|1513184|text|当没有足够的行来填充tableView时，所有现有的解决方案都不适用于我的iOS+8，因为iOS会在这种情况下自动调整插入。(当有足够的行时，现有的答案是好的)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1513185|在这个问题上浪费了大约6个小时后，我终于得到了这个解决方案。|1513186|简而言之，如果没有足够的单元格，则需要在tableView中插入空单元格，这样tableView的内容大小就足够大，iOS不会为您调整插入内容。|1513187|下面是我在Swift中是如何做到的：|1513188|1.)将变量minimumCellNum声明为类属性|offset|length|style|CODE|1513189|var+minimumCellNum:+Int?|code-block|syntax|javascript|1513190|2.)计算minimumCellNum并在viewWillAppear中设置tableView.contentOffset|1513191|let+screenHeight+=+Int(UIScreen.mainScreen().bounds.height)

//+101+=+Height+of+Status+Bar(20)+%2B+Height+of+Navigation+Bar(44)+%2B+Height+of+Tab+Bar(49)
//+you+may+need+to+subtract+the+height+of+other+custom+views+from+the+screenHeight.+For+example,+the+height+of+your+section+headers.
self.minimumCellNum+=+(screenHeight+-+103+-+heightOfOtherCustomView)+/+heightOfYourCell
self.tableView.contentOffset+=+CGPointMake(0,+44)|1513192|3.)在tableView(tableView:+UITableView,+numberOfRowsInSection+section:+Int))中|1513193|let+numOfYourRows+=+YOUR+LOGIC
if+numOfYourRows+>+minimumCellNum+{
++++return+numOfYourRows
}+else+{
++++return+minimumCellNum!
}|1513194|4.)在情节提要和tableView(tableView:+UITableView,+cellForRowAtIndexPath+indexPath:+NSIndexPath)中注册一个selection属性为None的空单元格|1513195|if+indexPath.row+<+numOfYourRows+{
++++return+YOUR+CUSTOM+CELL
}+else+{
++++let+cell+=+tableView.dequeueReusableCellWithIdentifier("EmptyCell",+forIndexPath:+indexPath)+as!+UITableViewCell
++++return+cell
}|1513196|5.)在tableView(tableView:+UITableView,+didSelectRowAtIndexPath+indexPath:+NSIndexPath)中|1513197|if+tableView+==+self.tableView+{
++++if+numOfYourRows+<+(indexPath.row+%2B+1)+{
++++++++return
++++}
++++YOUR+LOGIC+OF+SELECTING+A+CELL
}|1513198|这不是一个完美的解决方案，但它是我在iOS+8上真正有效的唯一解决办法。我想知道是否有更好的解决方案。|1513199|entityMap^0|0|0|0|0|6|E|0|0|5|E|L|E|12|N|0|0|4|1Y|0|0|9|27|2L|9|2X|4|0|0|4|29|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1E|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1F|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1G|8|@$J|1H|K|1I|L|M]]|9|@]|A|$]]|$1|N|3|O|5|P|7|1J|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1K|8|@$J|1L|K|1M|L|M]|$J|1N|K|1O|L|M]|$J|1P|K|1Q|L|M]]|9|@]|A|$]]|$1|U|3|V|5|P|7|1R|8|@]|9|@]|A|$Q|R]]|$1|W|3|X|5|6|7|1S|8|@$J|1T|K|1U|L|M]]|9|@]|A|$]]|$1|Y|3|Z|5|P|7|1V|8|@]|9|@]|A|$Q|R]]|$1|10|3|11|5|6|7|1W|8|@$J|1X|K|1Y|L|M]|$J|1Z|K|20|L|M]|$J|21|K|22|L|M]]|9|@]|A|$]]|$1|12|3|13|5|P|7|23|8|@]|9|@]|A|$Q|R]]|$1|14|3|15|5|6|7|24|8|@$J|25|K|26|L|M]]|9|@]|A|$]]|$1|16|3|17|5|P|7|27|8|@]|9|@]|A|$Q|R]]|$1|18|3|19|5|6|7|28|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|29|8|@]|9|@]|A|$]]]|1B|$]]

All existing solutions don't work for me on iOS 8 when there are not enough rows to fill the tableView since iOS will adjust the inset automatically in this situation. (Existing answers are good when there are enough rows though)

After wasting like 6 hours on this issue, I finally got this solution.

In short, you need to insert empty cells into the tableView if there are not enough cells, so the content size of the tableView is big enough that iOS won't adjust the inset for you.

Here is how I did it in Swift:

1.) declare a variable <code>minimumCellNum</code> as a class property

<pre><code>var minimumCellNum: Int?
</code></pre>

2.) calculate <code>minimumCellNum</code> and set <code>tableView.contentOffset</code> in <code>viewWillAppear</code>

<pre><code>let screenHeight = Int(UIScreen.mainScreen().bounds.height)

// 101 = Height of Status Bar(20) + Height of Navigation Bar(44) + Height of Tab Bar(49)
// you may need to subtract the height of other custom views from the screenHeight. For example, the height of your section headers.
self.minimumCellNum = (screenHeight - 103 - heightOfOtherCustomView) / heightOfYourCell
self.tableView.contentOffset = CGPointMake(0, 44)
</code></pre>

3.) in <code>tableView(tableView: UITableView, numberOfRowsInSection section: Int))</code>

<pre><code>let numOfYourRows = YOUR LOGIC
if numOfYourRows &gt; minimumCellNum {
 return numOfYourRows
} else {
 return minimumCellNum!
}
</code></pre>

4.) Register an empty cell, whose <code>selection</code> attribute is <code>None</code>, on the storyboard and in <code>tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)</code>

<pre><code>if indexPath.row &lt; numOfYourRows {
 return YOUR CUSTOM CELL
} else {
 let cell = tableView.dequeueReusableCellWithIdentifier("EmptyCell", forIndexPath: indexPath) as! UITableViewCell
 return cell
}
</code></pre>

5.) in <code>tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)</code>

<pre><code>if tableView == self.tableView {
 if numOfYourRows &lt; (indexPath.row + 1) {
 return
 }
 YOUR LOGIC OF SELECTING A CELL
}
</code></pre>

This is not a perfect solution, but it's the only workaround that really works for me on iOS 8. I'd like to know if there is a neater solution.

blocks|key|1298537|text|内容偏移是可行的，但它并不是100%25有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298538|如果您将estimatedRowHeight设置为一个固定的数字，它将不起作用。我还不了解周围的工作。我已经创建了一个显示问题的project，并且我已经和苹果一起创建了一个radar。|offset|length|style|CODE|1298539|如果你想要一个如何快速设置它的例子，请查看该项目。|1298540|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/ryanjm/ExampleTableView|1|https://openradar.appspot.com/radar?id=5061770456596480^0|0|4|I|1S|7|0|2F|5|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@$D|X|E|Y|1|Z]|$D|10|E|11|1|12]]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

Content offset is the way to go, but it doesn't work 100% of the time.

It doesn't work if are setting <code>estimatedRowHeight</code> to a fixed number. I don't know the work around yet. I've created a <a href="https://github.com/ryanjm/ExampleTableView" rel="nofollow">project</a> showing the issue(s) and I've created a <a href="https://openradar.appspot.com/radar?id=5061770456596480" rel="nofollow">radar</a> with Apple.

Check out the project if you want an example in swift of how to set it all up.

blocks|key|1298597|text|对于Swift：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298598|只需使表格视图内容偏移量，这应该像搜索栏的高度。|1298599|self.tableView.contentOffset+=+CGPointMake(0,+self.searchController.searchBar.frame.size.height)|code-block|syntax|javascript|1298600|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For Swift:

Just make tableview content y offset, which should be like height of searchbar.

<pre><code>self.tableView.contentOffset = CGPointMake(0, self.searchController.searchBar.frame.size.height)
</code></pre>

blocks|key|1298642|text|对于Swift+3%2B|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298643|我这样做了：|1298644|声明此var|offset|length|style|CODE|1298645|++++var+searchController+=+UISearchController()|code-block|syntax|javascript|1298646|在viewDidLoad()方法中|1298647|++++searchController+=+UISearchController(searchResultsController:+nil)
++++searchController.searchResultsUpdater+=+self
++++searchController.hidesNavigationBarDuringPresentation+=+false
++++searchController.dimsBackgroundDuringPresentation+=+true
++++searchController.searchBar.placeholder+=+NSLocalizedString("Search",+comment:+"")
++++definesPresentationContext+=+true
++++tableView.tableHeaderView+=+searchController.searchBar

++++tableView.contentOffset+=+CGPoint(x:+0,+y:+searchController.searchBar.frame.size.height)|1298648|entityMap^0|0|0|3|3|0|0|1|D|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|Z|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|10|8|@$F|11|G|12|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

For Swift 3+

I did this:

Declare this <code>var</code>:

<pre><code> var searchController = UISearchController()
</code></pre>

And in the <code>viewDidLoad()</code> method

<pre><code> searchController = UISearchController(searchResultsController: nil)
 searchController.searchResultsUpdater = self
 searchController.hidesNavigationBarDuringPresentation = false
 searchController.dimsBackgroundDuringPresentation = true
 searchController.searchBar.placeholder = NSLocalizedString("Search", comment: "")
 definesPresentationContext = true
 tableView.tableHeaderView = searchController.searchBar

 tableView.contentOffset = CGPoint(x: 0, y: searchController.searchBar.frame.size.height)
</code></pre>

blocks|key|1513402|text|Swift+3|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1513403|也适用于空表！|1513404|在我的环境中，我通过xib文件加载自定义单元格，rowHeight是自动设置的。|1513405|++++override+func+tableView(_+tableView:+UITableView,+willDisplay+cell:+UITableViewCell,+forRowAt+indexPath:+IndexPath)+{
++++++++self.tableView.contentOffset+=+CGPoint(x:+0,+y:+self.tableView.contentOffset.y+%2B+self.searchController.searchBar.bounds.height)
}|code-block|syntax|javascript|1513406|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift 3

works with empty table too!

In my environment I load custom cells by xib file and the rowHeight is automatic set.

<pre><code> override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
 self.tableView.contentOffset = CGPoint(x: 0, y: self.tableView.contentOffset.y + self.searchController.searchBar.bounds.height)
}
</code></pre>

blocks|key|1298687|text|下面的代码对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298688|self.tableView.contentOffset+=+CGPointMake(0.0,+44.0);|code-block|syntax|javascript|1298689|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Below code is working for me

<pre><code>self.tableView.contentOffset = CGPointMake(0.0, 44.0);
</code></pre>

blocks|key|1513445|text|我尝试设置内容偏移量和scrollToIndexpath，但都不能令人满意。我从viewDidLoad中删除了tableHeaderView+as+searchBar的设置，并在scrollview委托中设置它，如下所示|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1513446|override+func+scrollViewWillBeginDragging(scrollView:+UIScrollView)+{
++++if+scrollView.contentOffset.y+<+0+&&+tableView.tableHeaderView+==+nil+{
++++++++tableView.tableHeaderView+=+searchController.searchBar
++++++++tableView.setContentOffset(CGPointMake(0,+scrollView.contentOffset.y+%2B+searchController.searchBar.frame.size.height),+animated:+false)
++++}
}|code-block|syntax|javascript|1513447|这就像charm.The内容偏移量设置一样，用于平滑滚动|1513448|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I tried setting the content offset and scrollToIndexpath but nothing worked satisfactorily. I removed the setting of tableHeaderView as searchBar from viewDidLoad and set it in scrollview delegate as below

<pre><code>override func scrollViewWillBeginDragging(scrollView: UIScrollView) {
 if scrollView.contentOffset.y &lt; 0 &amp;&amp; tableView.tableHeaderView == nil {
 tableView.tableHeaderView = searchController.searchBar
 tableView.setContentOffset(CGPointMake(0, scrollView.contentOffset.y + searchController.searchBar.frame.size.height), animated: false)
 }
}
</code></pre>

This worked like a charm.The content offset setting is for smooth scrolling purpose

blocks|key|1298791|text|我也遇到过类似的问题。我发现解决这个问题的唯一方法是在UITableView+contentOffset属性上使用键值观察器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1298792|经过一些调试后，我意识到只有当表视图的内容大小小于表视图时，问题才会出现。当我在viewWillAppear上的时候，我开始KVO。视图出现0.3秒后，调度停止KVO。每次contentOffset变为0.0时，KVO都会做出反应，并在搜索栏高度上设置contentOffset。我在0.3秒后异步停止KVO，因为视图布局即使在视图出现后也会重置contentOffset。|1298793|-+(void)viewWillAppear:(BOOL)animated+{
++[super+viewWillAppear:animated];
++[self.tableView+addObserver:self+forKeyPath:@"contentOffset"+options:NSKeyValueObservingOptionNew+context:nil];
}

-(void)viewDidAppear:(BOOL)animated{
+++__weak+typeof+(self)+weakSelf+=+self;
+++dispatch_after(dispatch_time(DISPATCH_TIME_NOW,+(int64_t)(.3+*+NSEC_PER_SEC)),+dispatch_get_main_queue(),+%5E{
++++[weakSelf.tableView+removeObserver:self+forKeyPath:@"contentOffset"];});
}

-+(void)observeValueForKeyPath:(NSString+*)keyPath+ofObject:(id)object+change:(NSDictionary+*)change+context:(void+*)context{
++++if+([keyPath+isEqualToString:@"contentOffset"]+&&+self.tableView.contentOffset.y+==+0.0)+{
+++++++self.tableView.contentOffset+=+CGPointMake(0,+CGRectGetHeight(self.tableView.tableHeaderView.frame));
++++}
}

-(void)dealloc+{
++++[self.tableView+removeObserver:self+forKeyPath:@"contentOffset"];
}|code-block|syntax|javascript|1298794|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I had similar problem. And only way i found to resolve this problem was to use key value observer on UITableView contentOffset property.

After some debugging i realized that problem appear just if table view content size is smaller than tableview. I start KVO when on viewWillAppear. 
And dispatch stop KVO 0.3 seconds after view appear. Every time contentOffset became 0.0, KVO react and set contentOffset on search bar height.
I stop KVO asynchronous after 0.3 seconds because view layout will reset contentOffset even after view appear. 

<pre><code>- (void)viewWillAppear:(BOOL)animated {
 [super viewWillAppear:animated];
 [self.tableView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:nil];
}

-(void)viewDidAppear:(BOOL)animated{
 __weak typeof (self) weakSelf = self;
 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
 [weakSelf.tableView removeObserver:self forKeyPath:@"contentOffset"];});
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
 if ([keyPath isEqualToString:@"contentOffset"] &amp;&amp; self.tableView.contentOffset.y == 0.0) {
 self.tableView.contentOffset = CGPointMake(0, CGRectGetHeight(self.tableView.tableHeaderView.frame));
 }
}

-(void)dealloc {
 [self.tableView removeObserver:self forKeyPath:@"contentOffset"];
}
</code></pre>

blocks|key|1513590|text|如果表中没有行，则scrollToRowAtIndexPath方法会导致崩溃。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1513591|UITableView只是一个滚动视图，所以您可以简单地更改内容偏移量。|1513592|这将检查您是否有一些东西作为您的tableHeaderView，并假设您确实滚动以隐藏它|1513593|++++if+let+searchHeight+=+tableView.tableHeaderView?.frame.height+{
++++++++tableView.setContentOffset(CGPoint.init(x:+0,+y:searchHeight+),+animated:+false)
++++}|code-block|syntax|javascript|1513594|entityMap^0|9|M|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|U|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|V|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

The <code>scrollToRowAtIndexPath</code> method causes a crash if there are zero rows in the table.

UITableView is just a scroll view though, so you can simply change the content offset.

This checks that you have something as your tableHeaderView, and assuming you do scrolls to hide it

<pre><code> if let searchHeight = tableView.tableHeaderView?.frame.height {
 tableView.setContentOffset(CGPoint.init(x: 0, y:searchHeight ), animated: false)
 }
</code></pre>

I used the Interface Builder to create a table view, to which I added the library's Search Bar and Search Display Controller to add search functionality. However, IB set it up so that the bar is visible at the top of the screen when the view is first displayed.

I'd like to know how to have the search bar be hidden by default but still scrollable with the table view (see Apple's Mail application for an example). I've tried calling <code>scrollRectToVisible:animated:</code> in <code>viewDidLoad</code> to scroll the table view down, but to no avail. What's the preferred way of hiding the search bar by default?

iPhone: Hide UITableView search bar by default

Swift

我使用Interface Builder创建了一个表视图，并在其中添加库的搜索栏和搜索显示控制器以添加搜索功能。但是，IB对其进行了设置，以便在第一次显示视图时，该条显示在屏幕顶部。我想知道如何在默认情况下隐藏搜索栏，但仍然可以在表视图中滚动(参见Apple的Mail应用程序的示例)。我尝试在viewDidLoad中调...

问iPhone:默认隐藏UITableView搜索栏
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