blocks|key|1270783|text|尝试此操作可将光标移动到文本的顶部。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1270784|NSRange+r++=+{0,0};
[yourTextView+setSelectedRange:r];|code-block|syntax|javascript|1270785|看看这是怎么回事。请确保在所有事件都已触发或正在执行的所有操作完成后调用此函数。|1270786|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|$]]

Try this to move the cursor to the top of the text.

<pre><code>NSRange r = {0,0};
[yourTextView setSelectedRange:r];
</code></pre>

See how that goes. Make sure you call this after all your events have fired or what ever you are doing is done.

blocks|key|1485417|text|我不确定我是否理解了您的问题，但您是否正在尝试简单地将视图滚动到顶部？如果是这样，您应该这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1485418|[textview+scrollRectToVisible:CGRectMake(0,0,1,1)+animated:YES];|offset|length|style|CODE|1485419|entityMap^0|0|0|1S|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I'm not sure if I understand your question, but are you trying to simply scroll the view to the top? If so you should do

<code>
[textview scrollRectToVisible:CGRectMake(0,0,1,1) animated:YES];
</code>

blocks|key|1270847|text|UITextView*note;
[note+setContentOffset:CGPointZero+animated:YES];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1270848|这对我来说就够了。|unstyled|1270849|Swift版本(在Xcode9.3上使用iOS+11的Swift+4.1+)：|1270850|note.setContentOffset(.zero,+animated:+true)|1270851|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$B|C]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre class="lang-obj-c prettyprint-override"><code>UITextView*note;
[note setContentOffset:CGPointZero animated:YES];
</code></pre>

This does it for me. 

Swift version (Swift 4.1 with iOS 11 on Xcode 9.3):

<pre class="lang-swift prettyprint-override"><code>note.setContentOffset(.zero, animated: true)
</code></pre>

blocks|key|1485467|text|[txtView+setContentOffset:CGPointMake(0.0,+0.0)+animated:YES];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1485468|这行代码适用于我。|unstyled|1485469|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>[txtView setContentOffset:CGPointMake(0.0, 0.0) animated:YES];
</code></pre>

This line of code works for me.

blocks|key|1270919|text|我在HTML语言中使用attributedString，文本视图不可编辑。设置内容偏移量对我也不起作用。这对我很有效:禁用滚动功能，设置文本，然后再次启用滚动功能|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1270920|[yourTextView+setScrollEnabled:NO];
yourTextView.text+=+yourtext;
[yourTextView+setScrollEnabled:YES];|code-block|syntax|javascript|1270921|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|$]]

I was using attributedString in HTML with text view not editable. Setting the content offset did not work for me either. This worked for me: disable scroll enabled, set the text and then enable the scrolling again

<pre><code>[yourTextView setScrollEnabled:NO];
yourTextView.text = yourtext;
[yourTextView setScrollEnabled:YES];
</code></pre>

blocks|key|1485566|text|如果有人在iOS+8中遇到这个问题，我发现只需设置UITextView's+text属性，然后使用带有location:0的length:0的NSRange调用scrollRangeToVisible就可以了。我的文本视图是不可编辑的，并且我测试了可选择和不可选择(这两个设置都不会影响结果)。下面是一个Swift的例子：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1485567|myTextView.text+=+"Text+that+is+long+enough+to+scroll"
myTextView.scrollRangeToVisible(NSRange(location:0,+length:0))|code-block|syntax|javascript|1485568|entityMap^0|P|C|1F|A|1Q|8|1Z|7|28|K|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|L|$]]

If anyone has this problem in iOS 8, I found that just setting the <code>UITextView's</code> text property, then calling <code>scrollRangeToVisible</code> with an <code>NSRange</code> with <code>location:0</code>, <code>length:0</code>, worked. My text view was not editable, and I tested both selectable and not selectable (neither setting affected the result). Here's a Swift example:

<pre><code>myTextView.text = "Text that is long enough to scroll"
myTextView.scrollRangeToVisible(NSRange(location:0, length:0))
</code></pre>

blocks|key|1271026|text|结合前面的答案，现在它应该可以工作了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271027|talePageText.scrollEnabled+=+false
talePageText.textColor+=+UIColor.blackColor()
talePageText.font+=+UIFont(name:+"Bradley+Hand",+size:+24.0)
talePageText.contentOffset+=+CGPointZero
talePageText.scrollRangeToVisible(NSRange(location:0,+length:0))
talePageText.scrollEnabled+=+true|code-block|syntax|javascript|1271028|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|$]]

Combined the previous answers, now it should work:

<pre><code>talePageText.scrollEnabled = false
talePageText.textColor = UIColor.blackColor()
talePageText.font = UIFont(name: "Bradley Hand", size: 24.0)
talePageText.contentOffset = CGPointZero
talePageText.scrollRangeToVisible(NSRange(location:0, length:0))
talePageText.scrollEnabled = true
</code></pre>

blocks|key|1271084|text|呼叫|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271085|scrollRangeToVisible(NSMakeRange(0,+0))|code-block|syntax|javascript|1271086|工作，但调用它|1271087|override+func+viewDidAppear(animated:+Bool)|1271088|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|$]]

Calling 

<pre><code>scrollRangeToVisible(NSMakeRange(0, 0))
</code></pre>

works but call it in

<pre><code>override func viewDidAppear(animated: Bool)
</code></pre>

blocks|key|1271100|text|[self.textView+scrollRectToVisible:CGRectMake(0,+0,+320,+self.textView.frame.size.height)+animated:NO];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1271101|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>[self.textView scrollRectToVisible:CGRectMake(0, 0, 320, self.textView.frame.size.height) animated:NO];
</code></pre>

blocks|key|1271140|text|这是我的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271141|++++override+func+viewDidLoad()+{
++++++++textView.scrollEnabled+=+false
++++++++textView.text+=+"your+text"
++++}

++++override+func+viewDidAppear(animated:+Bool)+{
++++++++textView.scrollEnabled+=+true
++++}|code-block|syntax|javascript|1271142|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|$]]

And here is my solution...

<pre><code> override func viewDidLoad() {
 textView.scrollEnabled = false
 textView.text = "your text"
 }

 override func viewDidAppear(animated: Bool) {
 textView.scrollEnabled = true
 }
</code></pre>

blocks|key|1485773|text|这就是它在iOS+9版本中的工作方式，因为textView在屏幕上显示之前会在顶部滚动|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1485774|-+(void)viewDidLoad
{
++++[super+viewDidLoad];
++++textView.scrollEnabled+=+NO;
}

-+(void)viewWillAppear:(BOOL)animated
{
++++[super+viewWillAppear:animated];
++++textView.scrollEnabled+=+YES;
}|code-block|syntax|javascript|1485775|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|$]]

This is how it worked on iOS 9 Release 
so as the textView is scrolled on top before appearing on screen 

<pre><code>- (void)viewDidLoad
{
 [super viewDidLoad];
 textView.scrollEnabled = NO;
}

- (void)viewWillAppear:(BOOL)animated
{
 [super viewWillAppear:animated];
 textView.scrollEnabled = YES;
}
</code></pre>

blocks|key|1271264|text|我有一个更新的答案，这将使文本视图正确显示，而没有用户体验滚动动画。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271265|override+func+viewWillAppear(animated:+Bool)+{
++++dispatch_async(dispatch_get_main_queue(),+{
++++++++self.introductionText.scrollRangeToVisible(NSMakeRange(0,+0))
++++})|code-block|syntax|javascript|1271266|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|$]]

I have an updated answer which will have the textview appear properly, and without the user experiencing a scroll animation. 

<pre><code>override func viewWillAppear(animated: Bool) {
 dispatch_async(dispatch_get_main_queue(), {
 self.introductionText.scrollRangeToVisible(NSMakeRange(0, 0))
 })
</code></pre>

blocks|key|1271281|text|对我来说，这段代码很好用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271282|++++textView.attributedText+=+newText+//or+textView.text+=+...

++++//this+part+of+code+scrolls+to+top
++++textView.contentOffset.y+=+-64
++++textView.scrollEnabled+=+false
++++textView.layoutIfNeeded()+//if+don't+work,+try+to+delete+this+line
++++textView.scrollEnabled+=+true|code-block|syntax|javascript|1271283|为了滚动到准确的位置并将其显示在屏幕顶部，我使用以下代码：|1271284|++++var+scrollToLocation+=+50+//<needed+position>
++++textView.contentOffset.y+=+textView.contentSize.height
++++textView.scrollRangeToVisible(NSRange.init(location:+scrollToLocation,+length:+1))|1271285|设置contentOffset.y会滚动到文本的末尾，然后scrollRangeToVisible会向上滚动到scrollToLocation的值。因此，所需的位置出现在scrollView的第一行。|1271286|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

For me fine works this code:

<pre><code> textView.attributedText = newText //or textView.text = ...

 //this part of code scrolls to top
 textView.contentOffset.y = -64
 textView.scrollEnabled = false
 textView.layoutIfNeeded() //if don't work, try to delete this line
 textView.scrollEnabled = true
</code></pre>

For scroll to exact position and show it on top of screen I use this code:

<pre><code> var scrollToLocation = 50 //&lt;needed position&gt;
 textView.contentOffset.y = textView.contentSize.height
 textView.scrollRangeToVisible(NSRange.init(location: scrollToLocation, length: 1))
</code></pre>

Setting contentOffset.y scrolls to the end of text, and then scrollRangeToVisible scrolls up to value of scrollToLocation. Thereby, needed position appears in first line of scrollView.

blocks|key|1271348|text|这对我很有效。它基于RyanTCBs的答案，但它是同一解决方案的Objective-C变体：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271349|-+(void)+viewWillAppear:(BOOL)animated+{
++++//+For+some+reason+the+text+view,+which+is+a+scroll+view,+did+scroll+to+the+end+of+the+text+which+seems+to+hide+the+imprint+etc+at+the+beginning+of+the+text.
++++//+On+some+devices+it+is+not+obvious+that+there+is+more+text+when+the+user+scrolls+up.
++++//+Therefore+we+need+to+scroll+textView+to+the+top.
++++[self.textView+scrollRangeToVisible:NSMakeRange(0,+0)];
}|code-block|syntax|javascript|1271350|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|$]]

This worked for me. It is based on RyanTCBs answer but it is the Objective-C variant of the same solution: 

<pre><code>- (void) viewWillAppear:(BOOL)animated {
 // For some reason the text view, which is a scroll view, did scroll to the end of the text which seems to hide the imprint etc at the beginning of the text.
 // On some devices it is not obvious that there is more text when the user scrolls up.
 // Therefore we need to scroll textView to the top.
 [self.textView scrollRangeToVisible:NSMakeRange(0, 0)];
}
</code></pre>

blocks|key|1271400|text|由于这些解决方案对我都不起作用，我浪费了太多的时间拼凑解决方案，这最终解决了我的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271401|override+func+viewWillAppear(animated:+Bool)+{
++++dispatch_async(dispatch_get_main_queue(),+{
++++++++let+desiredOffset+=+CGPoint(x:+0,+y:+-self.textView.contentInset.top)
++++++++self.textView.setContentOffset(desiredOffset,+animated:+false)
++++})
}|code-block|syntax|javascript|1271402|这真的很愚蠢，这不是这个控件的默认行为。|1271403|我希望这对其他人有所帮助。|1271404|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Since none of these solutions worked for me and I wasted way too much time piecing together solutions, this finally solved it for me. 

<pre><code>override func viewWillAppear(animated: Bool) {
 dispatch_async(dispatch_get_main_queue(), {
 let desiredOffset = CGPoint(x: 0, y: -self.textView.contentInset.top)
 self.textView.setContentOffset(desiredOffset, animated: false)
 })
}
</code></pre>

This is really silly that this is not default behavior for this control.

I hope this helps someone else out.

blocks|key|1486030|text|Swift+2答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486031|textView.scrollEnabled+=+false

/*+Set+the+content+of+your+textView+here+*/

textView.scrollEnabled+=+true|code-block|syntax|javascript|1486032|这样可以防止textView在设置后滚动到文本末尾。|1486033|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|$]]

Swift 2 Answer:

<pre><code>textView.scrollEnabled = false

/* Set the content of your textView here */

textView.scrollEnabled = true
</code></pre>

This prevents the textView from scrolling to the end of the text after setting it.

blocks|key|1486039|text|-(void)viewWillLayoutSubviews{
++++[super+viewWillLayoutSubviews];

++++[textview+setContentOffset:CGPointZero+animated:NO];
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1486040|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>-(void)viewWillLayoutSubviews{
 [super viewWillLayoutSubviews];

 [textview setContentOffset:CGPointZero animated:NO];
}
</code></pre>

blocks|key|1486104|text|对于我在iOS+9中使用scrollRangeToVisible方法的属性字符串(第一行是粗体，其他行是普通字体)，它停止了工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486105|所以我不得不使用：|1486106|textViewMain.attributedText+=+attributedString
textViewMain.scrollRangeToVisible(NSRange(location:0,+length:0))
delay(0.0,+closure:+{+
++++++++++++++++self.textViewMain.scrollRectToVisible(CGRectMake(0,+0,+10,+10),+animated:+false)
++++++++++++})|code-block|syntax|javascript|1486107|其中，延迟是：|1486108|func+delay(delay:Double,+closure:()->Void)+{
++++dispatch_after(
++++++++dispatch_time(
++++++++++++DISPATCH_TIME_NOW,
++++++++++++Int64(delay+*+Double(NSEC_PER_SEC))
++++++++),
++++++++dispatch_get_main_queue(),+closure)
}|1486109|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

For me in iOS 9 it stopped to work for me with attributed string with method scrollRangeToVisible (the 1 row was with bold font, other rows were with regular font)

So I had to use:

<pre><code>textViewMain.attributedText = attributedString
textViewMain.scrollRangeToVisible(NSRange(location:0, length:0))
delay(0.0, closure: { 
 self.textViewMain.scrollRectToVisible(CGRectMake(0, 0, 10, 10), animated: false)
 })
</code></pre>

where delay is:

<pre><code>func delay(delay:Double, closure:()-&gt;Void) {
 dispatch_after(
 dispatch_time(
 DISPATCH_TIME_NOW,
 Int64(delay * Double(NSEC_PER_SEC))
 ),
 dispatch_get_main_queue(), closure)
}
</code></pre>

blocks|key|1271597|text|尝试使用此2行解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271598|view.layoutIfNeeded()
textView.contentOffset+=+CGPointMake(textView.contentInset.left,+textView.contentInset.top)|code-block|syntax|javascript|1271599|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|$]]

Try to use this 2 lines solution:

<pre><code>view.layoutIfNeeded()
textView.contentOffset = CGPointMake(textView.contentInset.left, textView.contentInset.top)
</code></pre>

blocks|key|1271630|text|对于iOS+10和Swift+3，我做到了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271631|override+func+viewDidLoad()+{
++++super.viewDidLoad()
++++textview.isScrollEnabled+=+false
}

override+func+viewDidAppear(_+animated:+Bool)+{
++++super.viewDidAppear(animated)
++++textView.isScrollEnabled+=+true
}|code-block|syntax|javascript|1271632|对我来说很有效，不确定你是否在使用最新版本的Swift和iOS时遇到了问题。|1271633|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|$]]

For iOS 10 and Swift 3 I did:

<pre><code>override func viewDidLoad() {
 super.viewDidLoad()
 textview.isScrollEnabled = false
}

override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)
 textView.isScrollEnabled = true
}
</code></pre>

Worked for me, not sure if you're having the problem with the latest version of Swift and iOS.

blocks|key|1486234|text|Xcode+8.0的解决方案。Swift+2.3。适用于接口构建，可以很容易地修改为以编程方式工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486235|class+MBTextView:+UITextView
{
++++required+init?(coder+aDecoder:+NSCoder)
++++{
++++++++super.init(coder:+aDecoder)
++++++++setupView()
++++}

++++func+setupView()+{}
}

class+MBStartFromTopTV:+MBTextView
{
++++override+func+setupView()
++++{
++++++++//+some+custom+code
++++}

++++override+func+drawRect(rect:+CGRect)
++++{
++++++++super.drawRect(rect)
++++++++setContentOffset(CGPoint.zero,+animated:+false)
++++}
}|code-block|syntax|javascript|1486236|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|$]]

Solution for Xcode 8.0. Swift 2.3.
Works for interface build and can be easily modified to work programmatically.

<pre><code>class MBTextView: UITextView
{
 required init?(coder aDecoder: NSCoder)
 {
 super.init(coder: aDecoder)
 setupView()
 }

 func setupView() {}
}

class MBStartFromTopTV: MBTextView
{
 override func setupView()
 {
 // some custom code
 }

 override func drawRect(rect: CGRect)
 {
 super.drawRect(rect)
 setContentOffset(CGPoint.zero, animated: false)
 }
}
</code></pre>

blocks|key|1486270|text|问题解决:+iOS+=+10.2+Swift+3+UITextView|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486271|我只用了下面这一行：|1486272|displayText.contentOffset.y+=+0|code-block|syntax|javascript|1486273|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|$]]

Problem solved:
iOS = 10.2
Swift 3
UITextView

I just used the following line:

<pre><code>displayText.contentOffset.y = 0
</code></pre>

blocks|key|1486316|text|我遇到了这个问题，但在我的例子中，textview是一些自定义视图的子视图，并将其添加到ViewController中。所有的解决方案都没有对我起作用。为了解决这个问题，添加了0.1秒的延迟，然后启用了滚动。这对我很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486317|textView.isScrollEnabled+=+false
..
textView.text+=+//+set+your+text+here

let+dispatchTime+=+DispatchTime.now()+%2B+0.1
DispatchQueue.main.asyncAfter(deadline:+dispatchTime)+{
+++self.textView.isScrollEnabled+=+true
}|code-block|syntax|javascript|1486318|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|$]]

I had the problem, but in my case textview is the subview of some custom view and added it to ViewController. None of the solution worked for me. To solve the problem added 0.1 sec delay and then enabled scroll. It worked for me.

<pre><code>textView.isScrollEnabled = false
..
textView.text = // set your text here

let dispatchTime = DispatchTime.now() + 0.1
DispatchQueue.main.asyncAfter(deadline: dispatchTime) {
 self.textView.isScrollEnabled = true
}
</code></pre>

blocks|key|1486362|text|我的问题是设置textView在视图出现时滚动到顶部。适用于iOS+10.3.2和Swift+3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486363|解决方案1：|1486364|override+func+viewWillAppear(_+animated:+Bool)+{
++++super.viewWillAppear(animated)

++++//+It+doesn't+work.+Very+strange.
++++self.textView.setContentOffset(CGPoint.zero,+animated:+false)
}
override+func+viewDidAppear(_+animated:+Bool)+{
++++super.viewDidAppear(animated)

++++//+It+works,+but+with+an+animation+effection.
++++self.textView.setContentOffset(CGPoint.zero,+animated:+false)
}|code-block|syntax|javascript|1486365|解决方案2：|1486366|override+func+viewWillAppear(_+animated:+Bool)+{
++++super.viewWillAppear(animated)
++++//+It+works.+++++++
++++self.textView.contentOffset+=+CGPoint.zero
}|1486367|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

My issue is to set textView to scroll to top when view appeared. For iOS 10.3.2, and Swift 3.

<h2>Solution 1:</h2>

<pre><code>override func viewWillAppear(_ animated: Bool) {
 super.viewWillAppear(animated)

 // It doesn't work. Very strange.
 self.textView.setContentOffset(CGPoint.zero, animated: false)
}
override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)

 // It works, but with an animation effection.
 self.textView.setContentOffset(CGPoint.zero, animated: false)
}
</code></pre>

<h2>Solution 2:</h2>

<pre><code>override func viewWillAppear(_ animated: Bool) {
 super.viewWillAppear(animated)
 // It works. 
 self.textView.contentOffset = CGPoint.zero
}
</code></pre>

blocks|key|1486389|text|这是我的代码。它工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486390|class+MyViewController:+...+
{
++private+offsetY:+CGFloat+=+0
++@IBOutlet+weak+var+textView:+UITextView!
++...

++override+viewWillAppear(...)+
++{
++++++...
++++++offsetY+=+self.textView.contentOffset.y
++++++...
++}
++...
++func+refreshView()+{
++++++let+offSetY+=+textView.contentOffset.y
++++++self.textView.setContentOffset(CGPoint(x:0,+y:0),+animated:+true)
++++++DispatchQueue.main.asyncAfter(deadline:+.now()+%2B+0.3)+{
++++++++[unowned+self]+in
++++++++self.textView.setContentOffset(CGPoint(x:0,+y:self.offSetY),+
+++++++++++animated:+true)
++++++++self.textView.setNeedsDisplay()
++++++}
++}|code-block|syntax|javascript|1486391|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|$]]

Here are my codes. It works fine.

<pre><code>class MyViewController: ... 
{
 private offsetY: CGFloat = 0
 @IBOutlet weak var textView: UITextView!
 ...

 override viewWillAppear(...) 
 {
 ...
 offsetY = self.textView.contentOffset.y
 ...
 }
 ...
 func refreshView() {
 let offSetY = textView.contentOffset.y
 self.textView.setContentOffset(CGPoint(x:0, y:0), animated: true)
 DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
 [unowned self] in
 self.textView.setContentOffset(CGPoint(x:0, y:self.offSetY), 
 animated: true)
 self.textView.setNeedsDisplay()
 }
 }
</code></pre>

blocks|key|1271878|text|之前drew_s答案的Swift+3版本，在尝试了大多数其他答案后，这是唯一对我有效的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1271879|++++override+func+viewWillAppear(_+animated:+Bool)+{
++++DispatchQueue.main.async{
++++++++let+desiredOffset+=+CGPoint(x:+0,+y:+-self.person_description.contentInset.top)
++++++++self.person_description.setContentOffset(desiredOffset,+animated:+false)
++++}
}|code-block|syntax|javascript|1271880|这是工作代码的剪切和粘贴。用您的textview变量替换person_description。|1271881|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|$]]

Swift 3 version of drew_s answer earlier, which is the only thing that worked for me after trying most of the other answers. 

<pre><code> override func viewWillAppear(_ animated: Bool) {
 DispatchQueue.main.async{
 let desiredOffset = CGPoint(x: 0, y: -self.person_description.contentInset.top)
 self.person_description.setContentOffset(desiredOffset, animated: false)
 }
}
</code></pre>

This was a cut and paste of working code. Replace person_description with your textview variable.

blocks|key|1271974|text|我认为有些人在这个问题上有问题的原因是因为他们试图在这个TextView出现之前设置TextView滚动位置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1271975|当TextView还没有出现时，就没有什么可滚动的了。|1271976|您需要等待TextView首先出现，然后才能在viewDidAppear方法中设置其滚动位置，如下所示：|1271977|override+func+viewDidAppear(_+animated:+Bool)+{
++++super.viewDidAppear(animated)
++++textView.setContentOffset(CGPoint.zero,+animated:+false)
}|code-block|syntax|javascript|1271978|entityMap^0|S|8|16|8|0|1|8|0|5|8|N|D|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|P|$]]

I think the reason why some people are having problems with this issue is because they are trying to set the <code>TextView</code> scroll position, before this <code>TextView</code> has appeared. 

There is nothing to scroll, when the <code>TextView</code> hasn't yet appeared.

You need to wait for the <code>TextView</code> to appear first, and only then set its scroll position inside the <code>viewDidAppear</code> method as shown below:

<pre><code>override func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)
 textView.setContentOffset(CGPoint.zero, animated: false)
}
</code></pre>

blocks|key|1486661|text|ChallengerGuy的答案完全解决了我的问题，因为我在重新启用滚动功能之前添加了一个短暂的延迟。在添加延迟之前，我的PageController页面都是固定的，除了第一个页面，它也会在用户与页面进行任何交互后自动修复。添加延迟也修复了第一页的UITextView滚动位置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486662|override+open+func+viewDidLoad()+{
++++super.viewDidLoad()
++++textView.isScrollEnabled+=+false
++++textView.text+=+textToScroll++++++++++++
+++...+other+stuff
}

override+open+func+viewDidAppear(_+animated:+Bool)+{
++++super.viewDidAppear(animated)
++++Central().delay(0.5)+{
++++++++self.textView.isScrollEnabled+=+true
++++}
}|code-block|syntax|javascript|1486663|(我的Central()文件中的delay函数。)|1486664|func+delay(_+delay:+Double,+closure:@escaping+()->())+{
++++DispatchQueue.main.asyncAfter(deadline:+.now()+%2B+delay)+{
++++++++closure()
++++}
}|1486665|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|$]]

The answer by ChallengerGuy fully solved my problem once I added a brief delay before re-enabling scrolling. Prior to adding the delay, my PageController pages were all fixed except for the first page, which would also fix itself after any user interaction with the page. Adding the delay fixed the UITextView scroll position of that first page as well.

<pre><code>override open func viewDidLoad() {
 super.viewDidLoad()
 textView.isScrollEnabled = false
 textView.text = textToScroll 
 ... other stuff
}

override open func viewDidAppear(_ animated: Bool) {
 super.viewDidAppear(animated)
 Central().delay(0.5) {
 self.textView.isScrollEnabled = true
 }
}
</code></pre>

(The delay function in my Central() file.)

<pre><code>func delay(_ delay: Double, closure:@escaping ()-&gt;()) {
 DispatchQueue.main.asyncAfter(deadline: .now() + delay) {
 closure()
 }
}
</code></pre>

blocks|key|1486691|text|你可以使用下面的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486692|override+func+viewDidLayoutSubviews()+{
++++super.viewDidLayoutSubviews()
++++textView.scrollRangeToVisible(NSMakeRange(0,+0))
}|code-block|syntax|javascript|1486693|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|$]]

just you can use this code

<pre><code>override func viewDidLayoutSubviews() {
 super.viewDidLayoutSubviews()
 textView.scrollRangeToVisible(NSMakeRange(0, 0))
}
</code></pre>

blocks|key|1272112|text|我就是这么做的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1272113|Swift+4：|1272114|extension+UITextView+{

++++override+open+func+draw(_+rect:+CGRect)
++++{
++++++++super.draw(rect)
++++++++setContentOffset(CGPoint.zero,+animated:+false)
++++}

+}|code-block|syntax|javascript|1272115|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|$]]

That's how I did it

Swift 4:

<pre><code>extension UITextView {

 override open func draw(_ rect: CGRect)
 {
 super.draw(rect)
 setContentOffset(CGPoint.zero, animated: false)
 }

 }
</code></pre>

blocks|key|1272184|text|这段代码解决了这个问题，还有助于避免不必要的自动滚动到textView的末尾。只需使用setTextPreservingContentOffset:方法而不是直接将文本设置为textView即可。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1272185|@interface+ViewController+()+{
++++__weak+IBOutlet+UITextView+*textView;
++++CGPoint+lastContentOffset;
++++NSTimer+*autoscrollTimer;
++++BOOL+revertAnyContentOffsetChanges;
}

@end

@implementation+ViewController

-+(void)viewDidLoad
{
++++[super+viewDidLoad];
++++[textView+addObserver:self+forKeyPath:@"contentOffset"+options:NSKeyValueObservingOptionNew+context:nil];
}

-+(void)dealloc
{
++++[textView+removeObserver:self+forKeyPath:@"contentOffset"];
}

-+(void)setTextPreservingContentOffset:(NSString+*)text
{
++++lastContentOffset+=+textView.contentOffset;
++++[autoscrollTimer+invalidate];
++++revertAnyContentOffsetChanges+=+YES;
++++textView.text+=+text;
++++autoscrollTimer+=+[NSTimer+scheduledTimerWithTimeInterval:1+target:self+selector:@selector(enableScrolling:)+userInfo:nil+repeats:NO];
++++autoscrollTimer.tolerance+=+1;
}

-+(void)enableScrolling:(NSTimer+*)timer
{
++++revertAnyContentOffsetChanges+=+NO;
}

-+(void)observeValueForKeyPath:(NSString+*)keyPath+ofObject:(id)object+change:(NSDictionary+*)change+context:(void+*)context
{
++++if+(revertAnyContentOffsetChanges+&&+[keyPath+isEqualToString:@"contentOffset"]+&&+[[change+valueForKey:@"new"]+CGPointValue].y+!=+lastContentOffset.y)+{
++++++++[textView+setContentOffset:lastContentOffset+animated:NO];
++++}
}

@end|code-block|syntax|javascript|1272186|entityMap^0|17|V|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

This code solves the problem and also helps to avoid needless autoscroll to the end of textView. Just use method <code>setTextPreservingContentOffset:</code> instead of setting text to textView directly.

<pre><code>@interface ViewController () {
 __weak IBOutlet UITextView *textView;
 CGPoint lastContentOffset;
 NSTimer *autoscrollTimer;
 BOOL revertAnyContentOffsetChanges;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
 [super viewDidLoad];
 [textView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:nil];
}

- (void)dealloc
{
 [textView removeObserver:self forKeyPath:@"contentOffset"];
}

- (void)setTextPreservingContentOffset:(NSString *)text
{
 lastContentOffset = textView.contentOffset;
 [autoscrollTimer invalidate];
 revertAnyContentOffsetChanges = YES;
 textView.text = text;
 autoscrollTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(enableScrolling:) userInfo:nil repeats:NO];
 autoscrollTimer.tolerance = 1;
}

- (void)enableScrolling:(NSTimer *)timer
{
 revertAnyContentOffsetChanges = NO;
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
 if (revertAnyContentOffsetChanges &amp;&amp; [keyPath isEqualToString:@"contentOffset"] &amp;&amp; [[change valueForKey:@"new"] CGPointValue].y != lastContentOffset.y) {
 [textView setContentOffset:lastContentOffset animated:NO];
 }
}

@end
</code></pre>

blocks|key|1272192|text|这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1272193|++override+func+viewWillAppear(_+animated:+Bool)+{
++++super.viewWillAppear(animated)

++++DispatchQueue.main.async+{
++++++self.textView.scrollRangeToVisible(NSRange(location:+0,+length:+0))
++++}
++}|code-block|syntax|javascript|1272194|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|$]]

This worked for me

<pre><code> override func viewWillAppear(_ animated: Bool) {
 super.viewWillAppear(animated)

 DispatchQueue.main.async {
 self.textView.scrollRangeToVisible(NSRange(location: 0, length: 0))
 }
 }
</code></pre>

blocks|key|1272258|text|对于Swift，我认为最干净利落的方法就是继承UITextView的子类，并使用这个小技巧|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1272259|import+UIKit

class+MyTextView:+UITextView+{
++++override+var+text:+String!+{
++++++++willSet+{
++++++++++++isScrollEnabled+=+false
++++++++}+didSet+{
++++++++++++isScrollEnabled+=+true
++++++++}
++++}
}|code-block|syntax|javascript|1272260|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|$]]

For Swift I think the cleanest way to do this is to subclass UITextView and use this little trick

<pre><code>import UIKit

class MyTextView: UITextView {
 override var text: String! {
 willSet {
 isScrollEnabled = false
 } didSet {
 isScrollEnabled = true
 }
 }
}
</code></pre>

blocks|key|1486961|text|文本视图的默认行为是滚动到底部，因为它使用户能够继续编辑。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1486962|将文本视图的偏移量设置为它的最大值可以解决我的问题。|1486963|override+func+viewDidLayoutSubviews()+{++
++++super.viewDidLayoutSubviews()++
++++self.myTextView.contentOffset.y+=+-self.myTextView.contentInset.top++
}|code-block|syntax|javascript|1486964|注意:我的textView嵌入在导航控制器中。|1486965|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The default behaviour of the textview is the scroll to the bottom, as it enables the users to continue editing.

Setting the textview offset as its inset's top value solves it for me.

<pre><code>override func viewDidLayoutSubviews() { 
 super.viewDidLayoutSubviews() 
 self.myTextView.contentOffset.y = -self.myTextView.contentInset.top 
}
</code></pre>

Note: My textView was embedded inside a navigation controller.

OK, I'm having some problem with the <code>UITextView</code>. Here's the issue:

I add some text to a <code>UITextView</code>. The user then double clicks to select something.
I then change the text in the <code>UITextView</code> (programatically as above) and the <code>UITextView</code> scrolls to the bottom of the page where there is a cursor. 

However, that is NOT where the user clicked. It ALWAYS scrolls to the bottom of the <code>UITextView</code> regardless of where the user clicked. 

So here's my question: How do I force the <code>UITextView</code> to scroll to the top every time I change the text? I've tried <code>contentOffset</code> and <code>scrollRangeToVisible</code>. Neither work.

Any suggestions would be appreciated.

How do I force a UITextView to scroll to the top every time I change the text?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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好吧，我的UITextView出了点问题。这是问题所在：我向UITextView中添加了一些文本。然后，用户双击以选择某些内容。然后，我更改了UITextView中的文本(编程方式同上)，UITextView滚动到页面底部有光标的位置。然而，这并不是用户点击的地方。无论用户在哪里单击，它都会滚动到UITextView的...

问如何在每次更改文本时强制UITextView滚动到顶部？
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问如何在每次更改文本时强制UITextView滚动到顶部？
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