blocks|key|2323122|text|没有直接的方法可以做到这一点，也没有你写的方式。我能做到这一点的唯一方法是自己制作运动/动画。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2323123|例如，每1/10秒移动1px应该会模拟一个非常慢的滚动动画。(因为它是线性动画，所以数学很简单！)|2323124|如果你想获得更真实或更花哨的效果，并模拟easy-in+easy-off效果，那么你需要一些数学计算来计算bezier路径，这样你就可以知道每1/10秒的确切位置|2323125|至少第一种方法不应该那么困难。只需将或-performSelector:withObject:afterDelay+or+NSTimers用于|offset|length|style|CODE|2323126|-[UIScrollView+setContentOffset:(CGPoint*)];`|code-block|syntax|javascript|2323127|希望能有所帮助|2323128|entityMap^0|0|0|0|J|1E|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|X|8|@$H|Y|I|Z|J|K]]|9|@]|A|$]]|$1|L|3|M|5|N|7|10|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

There is no a direct way of doing this, nor doing the way you wrote it. The only way I can accomplish this is by making the movement/animation by my own.

For example move 1px every 1/10 second should simulate a very slow scroll animation. (Since its a linear animation maths are very easy!)

If you want to get more realistic or fancy and simulate easy-in easy-off effect then you need some maths to calculate a bezier path so you can know the exact position at every 1/10 second, for example

At least the first approach shouldn't be that difficult. 
Just use or <code>-performSelector:withObject:afterDelay or NSTimers</code>with 

<pre><code>-[UIScrollView setContentOffset:(CGPoint*)];`
</code></pre>

Hope it helps

blocks|key|255494|text|[UIView+animateWithDuration:2.0+animations:%5E{
++++scrollView.contentOffset+=+CGPointMake(x,+y);
}];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|255495|它起作用了。|unstyled|255496|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>[UIView animateWithDuration:2.0 animations:^{
 scrollView.contentOffset = CGPointMake(x, y);
}];
</code></pre>

It works.

blocks|key|1477411|text|直接设置内容偏移量对我不起作用。但是，将setContentOffset(offset,+animated:+false)包装在动画块中可以做到这一点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1477412|UIView.animate(withDuration:+0.5,+animations:+{
++++++++++++++++self.tableView.setContentOffset(
+++++++++++++++CGPoint(x:+0,+y:+yOffset),+animated:+false)
++++++++++++})|code-block|syntax|javascript|1477413|entityMap^0|K|15|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|$]]

Setting the content offset directly did not work for me. However, wrapping <code>setContentOffset(offset, animated: false)</code> inside an animation block did the trick.

<pre><code>UIView.animate(withDuration: 0.5, animations: {
 self.tableView.setContentOffset(
 CGPoint(x: 0, y: yOffset), animated: false)
 })
</code></pre>

blocks|key|1479501|text|我已经接受了nacho4d的答案并实现了代码，所以我认为对于其他人来说，看到这个问题的工作代码会很有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1479502|我将成员变量添加到我的类中：|1479503|CGPoint+startOffset;
CGPoint+destinationOffset;
NSDate+*startTime;

NSTimer+*timer;|code-block|syntax|javascript|1479504|和属性：|1479505|@property+(nonatomic,+retain)+NSDate+*startTime;
@property+(nonatomic,+retain)+NSTimer+*timer;|1479506|和一个计时器回调：|1479507|-+(void)+animateScroll:(NSTimer+*)timerParam
{
++++const+NSTimeInterval+duration+=+0.2;

++++NSTimeInterval+timeRunning+=+-[startTime+timeIntervalSinceNow];

++++if+(timeRunning+>=+duration)
++++{
++++++++[self+setContentOffset:destinationOffset+animated:NO];
++++++++[timer+invalidate];
++++++++timer+=+nil;
++++++++return;
++++}
++++CGPoint+offset+=+[self+contentOffset];

++++offset.x+=+startOffset.x+%2B
++++++++(destinationOffset.x+-+startOffset.x)+*+timeRunning+/+duration;

++++[self+setContentOffset:offset+animated:NO];
}|1479508|然后：|1479509|-+(void)+doAnimatedScrollTo:(CGPoint)offset
{
++++self.startTime+=+[NSDate+date];
++++startOffset+=+self.contentOffset;
++++destinationOffset+=+offset;

++++if+(!timer)
++++{
++++++++self.timer+=+[NSTimer+scheduledTimerWithTimeInterval:0.01
++++++++++++++++++++++++++++++++++++++++++++++++++++++target:self
++++++++++++++++++++++++++++++++++++++++++++++++++++selector:@selector(animateScroll:)
++++++++++++++++++++++++++++++++++++++++++++++++++++userInfo:nil
+++++++++++++++++++++++++++++++++++++++++++++++++++++repeats:YES];
++++}
}|1479510|您还需要在dealloc方法中进行计时器清理。由于计时器将保留对目标(+self+)的引用，而self对计时器也有引用，因此在viewWillDisappear中使用一些清除代码来取消/销毁计时器也可能是一个好主意。|1479511|对以上内容的任何评论或改进建议都将非常受欢迎，但它与我一起工作得非常好，并解决了我在使用setContentOffset:animated:时遇到的其他问题。|1479512|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

I've taken nacho4d's answer and implemented the code, so I thought it would be helpful for other people coming to this question to see working code:

I added member variables to my class:

<pre><code>CGPoint startOffset;
CGPoint destinationOffset;
NSDate *startTime;

NSTimer *timer;
</code></pre>

and properties:

<pre><code>@property (nonatomic, retain) NSDate *startTime;
@property (nonatomic, retain) NSTimer *timer;
</code></pre>

and a timer callback:

<pre><code>- (void) animateScroll:(NSTimer *)timerParam
{
 const NSTimeInterval duration = 0.2;

 NSTimeInterval timeRunning = -[startTime timeIntervalSinceNow];

 if (timeRunning &gt;= duration)
 {
 [self setContentOffset:destinationOffset animated:NO];
 [timer invalidate];
 timer = nil;
 return;
 }
 CGPoint offset = [self contentOffset];

 offset.x = startOffset.x +
 (destinationOffset.x - startOffset.x) * timeRunning / duration;

 [self setContentOffset:offset animated:NO];
}
</code></pre>

then:

<pre><code>- (void) doAnimatedScrollTo:(CGPoint)offset
{
 self.startTime = [NSDate date];
 startOffset = self.contentOffset;
 destinationOffset = offset;

 if (!timer)
 {
 self.timer = [NSTimer scheduledTimerWithTimeInterval:0.01
 target:self
 selector:@selector(animateScroll:)
 userInfo:nil
 repeats:YES];
 }
}
</code></pre>

you'd also need timer cleanup in the dealloc method. Since the timer will retain a reference to the target (self) and self has a reference to the timer, some cleanup code to cancel/destroy the timer in viewWillDisappear is likely to be a good idea too.

Any comments on the above or suggestions for improvement would be most welcome, but it is working very well with me, and solves other issues I was having with setContentOffset:animated:.

blocks|key|2323205|text|我很好奇你是否找到了解决你的问题的办法。我的第一个想法是使用一个带有块设置contentOffset的animateWithDuration:animations:调用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2323206|[UIView+animateWithDuration:2.0+animations:%5E{
++++scrollView.contentOffset+=+CGPointMake(x,+y);
}];|code-block|syntax|javascript|2323207|副作用|2323208|虽然这适用于简单的示例，但它也有非常不受欢迎的副作用。与setContentOffset:animated:相反，您在委托方法中所做的一切也会像scrollViewDidScroll:委托方法一样获得动画效果。|2323209|我正在滚动一个带有可重用磁贴的平铺滚动视图。这将在scrollViewDidScroll:中进行检查。当它们被重用时，它们会在滚动视图中获得一个新的位置，但会有动画效果，所以在整个视图中都会有动画效果的磁贴。看起来很酷，但完全没用。另一个不想要的副作用是，对磁贴和滚动视图边界的可能命中测试立即变得无用，因为一旦动画块执行，contentOffset就已经在一个新的位置。这使得内容在它们仍然可见时出现和消失，就像它们过去在滚动视图边界之外切换的位置一样。|2323210|对于setContentOffset:animated:，这一切都不是这样的。看起来UIScrollView没有在内部使用相同的技术。|2323211|有没有人对更改UIScrollView+setContentOffset:animated:执行的速度/持续时间有其他建议？|2323212|entityMap^0|1F|V|0|0|0|S|Q|20|K|0|P|K|0|2|Q|0|K|Q|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|V|$]]

I'm curious as to whether you found a solution to your problem. My first idea was to use an <code>animateWithDuration:animations:</code> call with a block setting the contentOffset:

<pre><code>[UIView animateWithDuration:2.0 animations:^{
 scrollView.contentOffset = CGPointMake(x, y);
}];
</code></pre>

<h3>Side effects</h3>

Although this works for simple examples, it also has very unwanted side effects. Contrary to the <code>setContentOffset:animated:</code> everything you do in delegate methods also gets animated, like the <code>scrollViewDidScroll:</code> delegate method.

I'm scrolling through a tiled scrollview with reusable tiles. This gets checked in the <code>scrollViewDidScroll:</code>. When they do get reused, they get a new position in the scroll view, but that gets animated, so there are tiles animating all the way through the view. Looks cool, yet utterly useless. Another unwanted side effect is that possible hit testing of the tiles and my scroll view's bounds is instantly rendered useless because the contentOffset is already at a new position as soon as the animation block executes. This makes stuff appear and disappear while they're still visible, as to where they used to be toggled just outside of the scroll view's bounds.

With <code>setContentOffset:animated:</code> this is all not the case. Looks like UIScrollView is not using the same technique internally.

Is there anyone with another suggestion for changing the speed/duration of the UIScrollView <code>setContentOffset:animated:</code> execution?

blocks|key|1477464|text|UIView会计算最终视图，然后为其设置动画。这就是为什么在动画结束时不可见的单元格在开始时也不可见。为了防止这种情况，需要在动画块中添加layoutIfNeeded：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477465|[UIView+animateWithDuration:2.0+animations:%5E{
++++[self.tableView+setContentOffset:CGPointMake(0,+0)];
++++[self.tableView+layoutIfNeeded]
}];|code-block|syntax|javascript|1477466|Swift版本：|1477467|UIView.animate(withDuration:+2)+{
++++self.tableView.contentOffset.y+=+10
++++self.tableView.layoutIfNeeded()
}|1477468|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|$]]

UIView calculates final view and then animates it. That's why cells that invisible on finish of animation invisible on start too. For prevent this needed add layoutIfNeeded in animation block:
<pre><code>[UIView animateWithDuration:2.0 animations:^{
 [self.tableView setContentOffset:CGPointMake(0, 0)];
 [self.tableView layoutIfNeeded]
}];
</code></pre>
Swift version:
<pre><code>UIView.animate(withDuration: 2) {
 self.tableView.contentOffset.y = 10
 self.tableView.layoutIfNeeded()
}
</code></pre>

blocks|key|2323349|text|https://github.com/dominikhofmann/PRTween|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2323350|子类UITableview|2323351|#import+"PRTween.h"


@interface+JPTableView+:+UITableView{
++PRTweenOperation+*activeTweenOperation;
}



-+(void)+doAnimatedScrollTo:(CGPoint)destinationOffset
{
++++CGPoint+offset+=+[self+contentOffset];

++++activeTweenOperation+=+[PRTweenCGPointLerp+lerp:self+property:@"contentOffset"+from:offset+to:destinationOffset+duration:1.5];


}|code-block|syntax|javascript|2323352|entityMap|0|LINK|mutability|MUTABLE|url^0|0|15|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|4]]]]

<a href="https://github.com/dominikhofmann/PRTween" rel="nofollow">https://github.com/dominikhofmann/PRTween</a>

subclass UITableview 

<pre><code>#import "PRTween.h"


@interface JPTableView : UITableView{
 PRTweenOperation *activeTweenOperation;
}



- (void) doAnimatedScrollTo:(CGPoint)destinationOffset
{
 CGPoint offset = [self contentOffset];

 activeTweenOperation = [PRTweenCGPointLerp lerp:self property:@"contentOffset" from:offset to:destinationOffset duration:1.5];


}
</code></pre>

blocks|key|3919865|text|您可以按如下方式设置时长：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3919866|scrollView.setValue(5.0，forKeyPath："contentOffsetAnimationDuration")+scrollView.setContentOffset(CGPoint(x:+100，y:+0)，CGPoint:+true)|3919867|这也将允许您获得所有常规的委托回调。|3919868|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You can set the duration as follows:

scrollView.setValue(5.0, forKeyPath: "contentOffsetAnimationDuration") scrollView.setContentOffset(CGPoint(x: 100, y: 0), animated: true)

This will also allow you to get all of your regular delegate callbacks.

blocks|key|3919674|text|如果你想做的只是滚动你的滚动视图，我认为你应该使用scroll+rect+to+visible。我刚试过这段代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3919675|+[UIView+animateWithDuration:.7
++++++++++++++++++++++delay:0
++++++++++++++++++++options:UIViewAnimationOptionCurveEaseOut
+++++++++++++++++animations:%5E{++
+++++++++++++++++++++CGRect+scrollToFrame+=+CGRectMake(0,+slide.frame.origin.y,+slide.frame.size.width,+slide.frame.size.height+%2B+kPaddingFromTop*2);
+++++++++++++++++++++CGRect+visibleFrame+=+CGRectMake(0,+scrollView.contentOffset.y,
++++++++++++++++++++++++++++++++++++++++++++++++++++++scrollView.frame.size.width,+scrollView.frame.size.height);
+++++++++++++++++++++if(!CGRectContainsRect(visibleFrame,+slide.frame))
+++++++++++++++++++++++++[self.scrollView+scrollRectToVisible:scrollToFrame+animated:FALSE];}];|code-block|syntax|javascript|3919676|它会将滚动视图滚动到我需要的位置，无论我设置它的持续时间是什么。关键是将animate设置为false。当它设置为true时，动画速度是该方法设置的默认值|3919677|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|$]]

IF all your trying to do is scroll your scrollview I think you should use scroll rect to visible. I just tried out this code

<pre><code> [UIView animateWithDuration:.7
 delay:0
 options:UIViewAnimationOptionCurveEaseOut
 animations:^{ 
 CGRect scrollToFrame = CGRectMake(0, slide.frame.origin.y, slide.frame.size.width, slide.frame.size.height + kPaddingFromTop*2);
 CGRect visibleFrame = CGRectMake(0, scrollView.contentOffset.y,
 scrollView.frame.size.width, scrollView.frame.size.height);
 if(!CGRectContainsRect(visibleFrame, slide.frame))
 [self.scrollView scrollRectToVisible:scrollToFrame animated:FALSE];}];
</code></pre>

and it scrolls the scrollview to the location i need for whatever duration i am setting it for. The key is setting animate to false. When it was set to true, the animation speed was the default value set by the method

blocks|key|1477375|text|对于那些在滚动UITableView或UICollectionView时也有项目消失问题的人，您可以扩展视图本身，这样我们就可以容纳更多可见的项目。如果您需要滚动很远的距离，或者用户可以取消动画，则不建议使用此解决方案。在我目前正在开发的应用程序中，我只需要让视图滚动一个固定的100px。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477376|NSInteger+scrollTo+=+100；|1477377|CGRect+frame+=+self.collectionView.frame;
frame.size.height+%2B=+scrollTo;
[self.collectionView+setFrame:frame];

[UIView+animateWithDuration:0.8+delay:0.0+options:(UIViewAnimationOptionCurveEaseIn)+animations:%5E{
++++[self.collectionView+setContentOffset:CGPointMake(0,+scrollTo)];
}+completion:%5E(BOOL+finished)+{
++++[UIView+animateWithDuration:0.8+delay:0.0+options:(UIViewAnimationOptionCurveEaseIn)+animations:%5E{
++++++++[self.collectionView+setContentOffset:CGPointMake(0,+0)];

++++}+completion:%5E(BOOL+finished)+{
++++++++CGRect+frame+=+self.collectionView.frame;
++++++++frame.size.height+-=+scrollTo;
++++++++[self.collectionView+setFrame:frame];
++++}];
}];|code-block|syntax|javascript|1477378|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 people who also have issues with disappearing items while scrolling a UITableView or a UICollectionView you can expand the view itself so that we hold more visible items. This solution is not recommended for situations where you need to scroll a great distance or in situations where the user can cancel the animation. In the app I'm currently working on I only needed to let the view scroll a fixed 100px.

NSInteger scrollTo = 100;

<pre><code>CGRect frame = self.collectionView.frame;
frame.size.height += scrollTo;
[self.collectionView setFrame:frame];

[UIView animateWithDuration:0.8 delay:0.0 options:(UIViewAnimationOptionCurveEaseIn) animations:^{
 [self.collectionView setContentOffset:CGPointMake(0, scrollTo)];
} completion:^(BOOL finished) {
 [UIView animateWithDuration:0.8 delay:0.0 options:(UIViewAnimationOptionCurveEaseIn) animations:^{
 [self.collectionView setContentOffset:CGPointMake(0, 0)];

 } completion:^(BOOL finished) {
 CGRect frame = self.collectionView.frame;
 frame.size.height -= scrollTo;
 [self.collectionView setFrame:frame];
 }];
}];
</code></pre>

blocks|key|1479668|text|我使用transitionWithView:duration:options:animations:completion:|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1479669|++++++++[UIView+transitionWithView:scrollView+duration:3+options:(UIViewAnimationOptionCurveLinear)+animations:%5E{
++++++++transitionWithView:scrollView.contentOffset+=+CGPointMake(contentOffsetWidth,+0);
++++}+completion:nil];|code-block|syntax|javascript|1479670|UIViewAnimationOptionCurveLinear是一个使动画均匀发生的选项。|1479671|虽然我发现在动画持续时间内，委托方法scrollViewDidScroll直到动画结束才会调用。|1479672|entityMap^0|3|1M|0|0|0|W|0|I|J|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

I use <code>transitionWithView:duration:options:animations:completion:</code>

<pre><code> [UIView transitionWithView:scrollView duration:3 options:(UIViewAnimationOptionCurveLinear) animations:^{
 transitionWithView:scrollView.contentOffset = CGPointMake(contentOffsetWidth, 0);
 } completion:nil];
</code></pre>

<code>UIViewAnimationOptionCurveLinear</code> is an option make animation to occur evenly over.

While I found that in an animation duration, the delegate method <code>scrollViewDidScroll</code> did not called until animation finished.

blocks|key|255525|text|您可以简单地使用基于块的动画来动画滚动视图的速度。首先计算要滚动到的偏移点，然后简单地传递该偏移值，如下所示.....|type|unstyled|depth|inlineStyleRanges|entityRanges|data|255526|++++[UIView+animateWithDuration:1.2
++++++++++++++++++++++delay:0.02+
++++++++++++++++++++++options:UIViewAnimationCurveLinear++
++++++++++++++++++++++animations:%5E{
+++++[colorPaletteScrollView+setContentOffset:+offset+];
+}
+completion:%5E(BOOL+finished)
+{+NSLog(@"animate");
+}+];|code-block|syntax|javascript|255527|这里的colorPaletteScrollView是我的自定义滚动视图，offset是传递的值。|255528|这段代码对我来说工作得很好。|255529|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|$]]

You can simply use block based animation to animate the speed of scrollview.
First calculate the offset point to which you want to scroll and then simply pass that offset value as here.....

<pre><code> [UIView animateWithDuration:1.2
 delay:0.02 
 options:UIViewAnimationCurveLinear 
 animations:^{
 [colorPaletteScrollView setContentOffset: offset ];
 }
 completion:^(BOOL finished)
 { NSLog(@"animate");
 } ];
</code></pre>

here colorPaletteScrollView is my custom scrollview and offset is the value passed .

this code works perfectly fine for me.

blocks|key|255420|text|你使用setContentOffset而不是滚动scrollRectToVisible:animated:有什么原因吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|255421|-+(void)scrollRectToVisible:(CGRect)rect+animated:(BOOL)animated|code-block|syntax|javascript|255422|我建议这样做：|255423|[UIView+beginAnimations:nil+context:nil];
[UIView+setAnimationDuration:3.0];
[self.tableView+scrollRectToVisible:CGRectMake(0,+0,+320,+0)+animated:NO];
[UIView+commitAnimations];|255424|除非那不起作用。我还是觉得你应该试试。|255425|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|$]]

Is there a reason you're using setContentOffset and not scrollRectToVisible:animated:?

<pre><code>- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
</code></pre>

I would recommend doing it like this:

<pre><code>[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:3.0];
[self.tableView scrollRectToVisible:CGRectMake(0, 0, 320, 0) animated:NO];
[UIView commitAnimations];
</code></pre>

Unless that doesnt work. I still think you should try it.

blocks|key|1477417|text|实际上，TK189的答案是部分正确的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477418|要实现自定义的持续时间动画contentOffset更改，并通过UITableView和UICollectionView组件正确重用单元格，您只需在动画块中添加layoutIfNeeded调用：|offset|length|style|BOLD|1477419|[UIView+animateWithDuration:2.0+animations:%5E{
++++tableView.contentOffset+=+CGPointMake(x,+y);
++++[tableView+layoutIfNeeded];
}];|code-block|syntax|javascript|1477420|entityMap^0|0|28|E|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Actually TK189's answer is partially correct.

To achieve a custom duration animated contentOffset change, with proper cell reuse by UITableView and UICollectionView components, you just have to add a layoutIfNeeded call inside the animations block:

<pre><code>[UIView animateWithDuration:2.0 animations:^{
 tableView.contentOffset = CGPointMake(x, y);
 [tableView layoutIfNeeded];
}];
</code></pre>

blocks|key|3919770|text|在Xcode+7.1+-+Swift+2.0上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3919771|func+textFieldShouldEndEditing(textField:+UITextField)+->+Bool+{

++++dispatch_async(dispatch_get_main_queue())+{
++++++++UIView.animateWithDuration(0,+animations:+{+self.scrollView!.setContentOffset(CGPointZero,animated:+true)+})
++++}
++++return+true
}|code-block|syntax|javascript|3919772|或|3919773|func+textFieldShouldReturn(textField:+UITextField)+->+Bool+{

++++if(textField.returnKeyType+==+UIReturnKeyType.Next)+{
++++++++password.becomeFirstResponder()
++++}

++++dispatch_async(dispatch_get_main_queue())+{
++++++++UIView.animateWithDuration(0,+animations:+{+self.scrollView!.setContentOffset(CGPointZero,animated:+true)+})
++++}

++++textField.resignFirstResponder()
++++return+true
}|3919774|注意:+self.scrollView!.setContentOffset(CGPointZero，动画:+true)可以根据需要有不同的位置|3919775|示例：|3919776|let+scrollPoint:CGPoint+=+CGPointMake(0,textField.frame.origin.y/2);
scrollView!.setContentOffset(scrollPoint,+animated:+true);|3919777|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

On Xcode 7.1 - Swift 2.0 :

<pre><code>func textFieldShouldEndEditing(textField: UITextField) -&gt; Bool {

 dispatch_async(dispatch_get_main_queue()) {
 UIView.animateWithDuration(0, animations: { self.scrollView!.setContentOffset(CGPointZero,animated: true) })
 }
 return true
}
</code></pre>

OR

<pre><code>func textFieldShouldReturn(textField: UITextField) -&gt; Bool {

 if(textField.returnKeyType == UIReturnKeyType.Next) {
 password.becomeFirstResponder()
 }

 dispatch_async(dispatch_get_main_queue()) {
 UIView.animateWithDuration(0, animations: { self.scrollView!.setContentOffset(CGPointZero,animated: true) })
 }

 textField.resignFirstResponder()
 return true
}
</code></pre>

Note: self.scrollView!.setContentOffset(CGPointZero,animated: true) can have different positions depending on the requirement

Example:

<pre><code>let scrollPoint:CGPoint = CGPointMake(0,textField.frame.origin.y/2);
scrollView!.setContentOffset(scrollPoint, animated: true);
</code></pre>

blocks|key|3919791|text|我想在textfield开始编辑时更改tableview的contentOffSet。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3919792|Swift+3.0|offset|length|style|BOLD|3919793|func+textFieldDidBeginEditing(_+textField:+UITextField)+{

DispatchQueue.main.async+{+
++++UIView.animate(withDuration:+0,+animations:+{

+++++self.sampleTableView.contentOffset+=+CGPoint(x:+0,+y:+0+-+(self.sampleTableView.contentInset.top+-+200+))
++++})+
}++++
}|code-block|syntax|javascript|3919794|entityMap^0|0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I wanted to change the contentOffSet of tableview when textfield begins to edit. 

Swift 3.0

<pre><code>func textFieldDidBeginEditing(_ textField: UITextField) {

DispatchQueue.main.async { 
 UIView.animate(withDuration: 0, animations: {

 self.sampleTableView.contentOffset = CGPoint(x: 0, y: 0 - (self.sampleTableView.contentInset.top - 200 ))
 }) 
} 
}
</code></pre>

Is there a way to change the speed of the animation when scrolling a <code>UITableView</code> using setContentOffset:animated:? I want to scroll it to the top, but slowly. When I try the following, it causes the bottom few cells to disappear before the animation starts (specifically, the ones that won't be visible when the scroll is done):

<pre><code>[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:3.0];
[self.tableView setContentOffset:CGPointMake(0, 0)];
[UIView commitAnimations];
</code></pre>

Any other way around this problem? There is a private method <code>_setContentOffsetAnimationDuration</code> that works, but I don't want to be rejected from the app store.

Change the speed of setContentOffset:animated:?

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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当使用setContentOffset：UITableView：来滚动动画时，有没有办法改变动画的速度？我想把它滚动到顶端，但要慢一点。当我尝试以下操作时，它会导致底部的几个单元格在动画开始之前消失(特别是在滚动完成时看不到的单元格)：[UIView beginAnimations:nil context:nil];[UIView setAnimationDuration:3.0];[self.t

问更改setContentOffset:animated:？的速度
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问更改setContentOffset:animated:？的速度
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