blocks|key|898510|text|可能需要朝那个方向看？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898511|+[UIView+animateWithDuration:+1.0
++++++++++++++++++animations:+%5E{
++++++++++++++++++++++[tableViewExercises+scrollToRowAtIndexPath:[NSIndexPath+indexPathForRow:previousSelectedExerciseCell+inSection:0]+atScrollPosition:UITableViewScrollPositionTop+animated:NO];
++++++++++++++++++}completion:+%5E(BOOL+finished){
++++++++++++++++++}
++++];|code-block|syntax|javascript|898512|仅使用动画:否。|898513|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|$]]

May need to look in that direction?

<pre><code> [UIView animateWithDuration: 1.0
 animations: ^{
 [tableViewExercises scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:previousSelectedExerciseCell inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
 }completion: ^(BOOL finished){
 }
 ];
</code></pre>

Work only with animated:NO.

blocks|key|898569|text|制作应用老虎机的常用方法是使用UIPickerView，也许你应该检查一下这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898570|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

the common way to make apps-slot-machines is with UIPickerView maybe you should check this..

blocks|key|898628|text|因为动画继承自UIScrollView，所以您还可以使用setContentOffset:+UITableView+:这样您就可以让您的表视图根据您的选择将一定数量的像素“滚动”到您喜欢的任何一侧。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898629|对于scrollToRowAtIndexPath:atScrollPosition:animated：，也可以这样做|898630|我做了一个原型只是为了向你展示它是如何工作的。|898631|因为这是通过计时器和其他东西完成的，所以您可以设置autoScroll将持续多长时间和多快(如果使用contentoffset，还可以设置动画播放的距离)。|898632|这是.h文件：|898633|#import+<UIKit/UIKit.h>

@interface+AutomaticTableViewScrollViewController+:+UIViewController+<UITableViewDelegate,UITableViewDataSource>
{
++++UITableView+*slotMachine;
++++NSMutableArray+*listOfItems;
++++NSTimer+*tableTimer;
}

@property+(nonatomic,retain)+UITableView+*slotmachine;
@property+(nonatomic,retain)+NSMutableArray+*listOfItems;
@property+(nonatomic,retain)+NSTimer+*tableTimer;

-(void)automaticScroll;
-(void)stopscroll;

@end|code-block|syntax|javascript|898634|这是.m文件：|898635|#import+"AutomaticTableViewScrollViewController.h"

@implementation+AutomaticTableViewScrollViewController

@synthesize+slotmachine;
@synthesize+listOfItems;
@synthesize+tableTimer;

-(void)loadView
{
++++[super+loadView];

++++slotmachine+=+[[UITableView+alloc]+initWithFrame:self.view.frame+style:UITableViewStylePlain];
++++slotmachine.delegate+=+self;
++++slotmachine.dataSource+=+self;
++++[self.view+addSubview:slotmachine];
}

-+(UITableViewCell+*)tableView:(UITableView+*)tableView+cellForRowAtIndexPath:(NSIndexPath+*)indexPath+
{++++
++++static+NSString+*CellIdentifier+=+@"Cell";

++++UITableViewCell+*cell+=+[tableView+dequeueReusableCellWithIdentifier:CellIdentifier];
++++if+(cell+==+nil)+{
++++++++cell+=+[[UITableViewCell+alloc]+initWithStyle:UITableViewCellStyleDefault+reuseIdentifier:CellIdentifier];
++++}

++++//+Set+up+the+cell...
++++if+(indexPath.row+%25+2+==+0)+
++++{
++++++++cell.textLabel.text+=+@"blalala";
++++}

++++return+cell;
}

-+(NSInteger)tableView:(UITableView+*)tableView+numberOfRowsInSection:(NSInteger)section
{
++++return+99999;
}

-+(void)tableView:(UITableView+*)tableView+didSelectRowAtIndexPath:(NSIndexPath+*)indexPath
{
++++//you+might+want+to+do+this+action+in+ur+buttonTargetMethod
++++//start+timers
++++tableTimer+=+[NSTimer+scheduledTimerWithTimeInterval:0.2+//this+value+arranges+the+speed+of+the+autoScroll
+++++++++++++++++++++++++++++++++++++++++++++++++++target:self
+++++++++++++++++++++++++++++++++++++++++++++++++selector:@selector(automaticScroll)
+++++++++++++++++++++++++++++++++++++++++++++++++userInfo:nil
++++++++++++++++++++++++++++++++++++++++++++++++++repeats:YES];

++++[NSTimer+scheduledTimerWithTimeInterval:5+//this+arranges+the+duration+of+the+scroll
+++++++++++++++++++++++++++++++++++++target:self
+++++++++++++++++++++++++++++++++++selector:@selector(stopscroll)
+++++++++++++++++++++++++++++++++++userInfo:nil
++++++++++++++++++++++++++++++++++++repeats:NO];+
}

-(void)automaticScroll
{
++++[slotmachine+setContentOffset:CGPointMake(slotmachine.contentOffset.x,+slotmachine.contentOffset.y+%2B+50)+animated:YES];+//the+50+stands+for+the+amount+of+movement+every+tick+the+timer+will+make
}

-(void)stopscroll
{
++++//stop+tabletimer+again
++++[tableTimer+invalidate];
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
++++return+YES;
}

@end|898636|如果您有任何问题，请随时留下评论，我将详细说明。|898637|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

Because a UITableView inherits from UIScrollView you might also use setContentOffset:animated:
This way you can make your tableview "scroll" a certain amount of pixels of your choosing to any side you like.

This can be done the same with the scrollToRowAtIndexPath:atScrollPosition:animated:

I made a prototype just to show you how it works.

Because this is done with timers and stuff you can set how long the autoScroll will last and how fast (and how far if you're using the contentoffset) the animation will go.

This is the .h file:

<pre><code>#import &lt;UIKit/UIKit.h&gt;

@interface AutomaticTableViewScrollViewController : UIViewController &lt;UITableViewDelegate,UITableViewDataSource&gt;
{
 UITableView *slotMachine;
 NSMutableArray *listOfItems;
 NSTimer *tableTimer;
}

@property (nonatomic,retain) UITableView *slotmachine;
@property (nonatomic,retain) NSMutableArray *listOfItems;
@property (nonatomic,retain) NSTimer *tableTimer;

-(void)automaticScroll;
-(void)stopscroll;

@end
</code></pre>

This is the .m file:

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

@implementation AutomaticTableViewScrollViewController

@synthesize slotmachine;
@synthesize listOfItems;
@synthesize tableTimer;

-(void)loadView
{
 [super loadView];

 slotmachine = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];
 slotmachine.delegate = self;
 slotmachine.dataSource = self;
 [self.view addSubview:slotmachine];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
 static NSString *CellIdentifier = @"Cell";

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
 if (cell == nil) {
 cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
 }

 // Set up the cell...
 if (indexPath.row % 2 == 0) 
 {
 cell.textLabel.text = @"blalala";
 }

 return cell;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
 return 99999;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
 //you might want to do this action in ur buttonTargetMethod
 //start timers
 tableTimer = [NSTimer scheduledTimerWithTimeInterval:0.2 //this value arranges the speed of the autoScroll
 target:self
 selector:@selector(automaticScroll)
 userInfo:nil
 repeats:YES];

 [NSTimer scheduledTimerWithTimeInterval:5 //this arranges the duration of the scroll
 target:self
 selector:@selector(stopscroll)
 userInfo:nil
 repeats:NO]; 
}

-(void)automaticScroll
{
 [slotmachine setContentOffset:CGPointMake(slotmachine.contentOffset.x, slotmachine.contentOffset.y + 50) animated:YES]; //the 50 stands for the amount of movement every tick the timer will make
}

-(void)stopscroll
{
 //stop tabletimer again
 [tableTimer invalidate];
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
 return YES;
}

@end
</code></pre>

If you have any question feel free to leave a comment and I will elaborate.

blocks|key|1113452|text|如果可以使用iOS+5，可以使用UIScrollViewDelegate方法scrollViewWillEndDragging:withVelocity:targetContentOffset:。这使您可以看到，用户移动手指的速度有多快，减速动画将在何处以默认速度结束，并允许您覆盖动画速度，以便在不同的点处结束。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1113453|entityMap^0|G|K|12|1N|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

If you can require iOS 5, you could use the <code>UIScrollViewDelegate</code> method <code>scrollViewWillEndDragging:withVelocity:targetContentOffset:</code>.
This allows you to see, how fast the user was moving the finger, where the deceleration animation would end with the default speed, and it allows you to override the animation speed, so that it ends at a different point.

blocks|key|898797|text|你不能(据我所知，我一直在到处寻找这样做的方法)让速度不是恒定的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898798|-+scrollToRowAtIndexPath:atScrollPosition:animated:|code-block|syntax|javascript|898799|所以我建议..。如果你真的需要它，用一些动画或其他东西来制作你自己的，或者做一些更容易的事情来节省你的时间，使用UIPickerView|offset|length|style|CODE|898800|entityMap^0|0|0|1K|C|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]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can't (to my knowledge, I have been looking everywhere for a way to do this) make a speed that isn't constant for 

<pre><code>- scrollToRowAtIndexPath:atScrollPosition:animated:
</code></pre>

So I would suggest... that if you really need it, make your own out of some animation or something, or do something alot easier that would save you some time, use <code>UIPickerView</code>

blocks|key|898821|text|如何设置一个计时器，然后在计时器触发时调用滚动：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|898822|start_index+=+0;
dest_index+=+20;
timer+=+[NSTimer+scheduledTimerWithTimeInterval:(0.1)+target:self+selector:@selector(rolling)+userInfo:nil+repeats:YES];++++++++++++++++


-+(void)rolling+{
start_index%2B%2B;
if+(start_index+<+dest_index)+{
++++NSIndexPath+*Index+=+[NSIndexPath+indexPathForRow:start_index+inSection:0];
++++[self.tableView+scrollToRowAtIndexPath:Index+atScrollPosition:UITableViewScrollPositionMiddle+animated:NO];
}+else+{
++++[timer+invalidate];
}
}|code-block|syntax|javascript|898823|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|$]]

How about setup a timer and then call the scroll when timer fires:

<pre><code>start_index = 0;
dest_index = 20;
timer = [NSTimer scheduledTimerWithTimeInterval:(0.1) target:self selector:@selector(rolling) userInfo:nil repeats:YES]; 


- (void)rolling {
start_index++;
if (start_index &lt; dest_index) {
 NSIndexPath *Index = [NSIndexPath indexPathForRow:start_index inSection:0];
 [self.tableView scrollToRowAtIndexPath:Index atScrollPosition:UITableViewScrollPositionMiddle animated:NO];
} else {
 [timer invalidate];
}
}
</code></pre>

blocks|key|1113593|text|我为这个答案找了很多，但最终还是想出了一个我自己的答案。您可以使用起始行号调用方法scrollAutomatically，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1113594|[self+scrollAutomatically:0];|code-block|syntax|javascript|1113595|这就是这个函数的样子。我正在处理一个总是有3000行的表，我打算滚动到底部。|1113596|-+(void)+scrollAutomatically:(int)+i
{
++++__block+int+j+=+i;
++++[UIView+animateWithDuration:+0//Change+this+to+something+more+for+slower+scrolls
+++++++++++++++++++++animations:+%5E{
+++++++++++++++++++++++++[self.tableView+scrollToRowAtIndexPath:[NSIndexPath+indexPathForRow:j+inSection:0]+atScrollPosition:UITableViewScrollPositionBottom+animated:NO];
+++++++++++++++++++++}
+++++++++++++++++++++completion:+%5E(BOOL+finished){
+++++++++++++++++++++++++j+=+j+%2B+10;//Changing+this+number+affects+speed.
+++++++++++++++++++++++++if(j<=2999)//here+you+could+provide+the+index+of+destination+row
+++++++++++++++++++++++++++++[self+scrollAutomatically:j];
+++++++++++++++++++++++++else
+++++++++++++++++++++++++{
+++++++++++++++++++++++++++++//I+had+some+code+here+that+popped+up+a+UIAlertView.
+++++++++++++++++++++++++}
+++++++++++++++++++++}];
}|1113597|现在来看一下卷轴的速度。|1113598|对于非常快速的滚动：|1113599|如果我将每次调用函数时将行索引(j)递增到10的值设置为10，即如果我编写j+=+j%2B10;，那么滚动3000行大约需要9秒。(3000+*我可以召集的平均每秒速度)。如果我将它设置为j+=+j%2B20;，那么这3000行大约需要4.5秒。你明白我的意思了。要使滚动速度变慢，请减小增量值。|offset|length|style|CODE|1113600|对于速度较慢、可读的卷轴：|1113601|[UIView+animateWithDuration:+1.5//this+will+directly+set+your+speed.+n+rows+scrolled+every+1.5+seconds.|1113602|注意:如果您更改CALayers或视图的框架(例如，您可能已经添加到您的tableViewCell的contentView的customView+)，那么这些动画将开始困扰您在这里。在较长的动画时间内，它们将非常明显，您可能会看到奇怪的单元格行为。|1113603|在这种情况下，无论您在哪里更改框架等，请查看如下内容：|1113604|[CATransaction+begin];
[CATransaction+setValue:(id)kCFBooleanTrue+forKey:kCATransactionDisableActions];
[myView.myCALayer.frame+=+(CGRect){+{+10,+10+},+{+100,+100+}+];
[CATransaction+commit];|1113605|找到上面的解决方案here。|1113606|您可能还必须为层设置操作字典，以便为所有操作返回空值。|1113607|NSMutableDictionary+*newActions+=+[[NSMutableDictionary+alloc]+initWithObjectsAndKeys:[NSNull+null],+@"sublayers",+nil];
superlayer.actions+=+newActions;|1113608|这似乎太晚了，但对于面临同样问题的人，我希望这个答案能有所帮助。另外，如果我犯了一些明显(或不是太多)的错误，请随时指导我。|1113609|编辑:哦，我在我的答案上面看到了确切的东西:(不管怎样，这是更详细的一点，我只是一个初学者:)|1113610|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/12103142/calayer-animates-with-frame-change^0|0|0|0|0|0|0|11|9|2K|9|0|0|0|0|0|0|9|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1R|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1S|8|@$Q|1T|R|1U|S|T]|$Q|1V|R|1W|S|T]]|9|@]|A|$]]|$1|U|3|V|5|6|7|1X|8|@]|9|@]|A|$]]|$1|W|3|X|5|D|7|1Y|8|@]|9|@]|A|$E|F]]|$1|Y|3|Z|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|20|8|@]|9|@]|A|$]]|$1|12|3|13|5|D|7|21|8|@]|9|@]|A|$E|F]]|$1|14|3|15|5|6|7|22|8|@]|9|@$Q|23|R|24|1|25]]|A|$]]|$1|16|3|17|5|6|7|26|8|@]|9|@]|A|$]]|$1|18|3|19|5|D|7|27|8|@]|9|@]|A|$E|F]]|$1|1A|3|1B|5|6|7|28|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|29|8|@]|9|@]|A|$]]|$1|1E|3|-4|5|6|7|2A|8|@]|9|@]|A|$]]]|1F|$1G|$5|1H|1I|1J|A|$1K|1L]]]]

I searched a lot for this answer but ultimately had to come up with one of my own.
You can call the method scrollAutomatically with the starting row number like:

<pre><code>[self scrollAutomatically:0];
</code></pre>

So this is what the function looked like. I was dealing with a table which always had 3000 rows and I intended to scroll to the bottom.

<pre><code>- (void) scrollAutomatically:(int) i
{
 __block int j = i;
 [UIView animateWithDuration: 0//Change this to something more for slower scrolls
 animations: ^{
 [self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:j inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:NO];
 }
 completion: ^(BOOL finished){
 j = j + 10;//Changing this number affects speed.
 if(j&lt;=2999)//here you could provide the index of destination row
 [self scrollAutomatically:j];
 else
 {
 //I had some code here that popped up a UIAlertView.
 }
 }];
}
</code></pre>

Now coming to the speed of the scroll. 

FOR REALLY FAST SCROLLS:

If I set value by which I increment the row index (j) on each call of the function to 10,
i.e. if I write <code>j = j+10;</code> then my 3000 rows took about 9 seconds to scroll. (3000 * mean FPS that I could muster).
If I set it to <code>j = j+20;</code> then the 3000 rows took about 4.5 seconds. So you get the idea.
To make it scroll slower reduce the increment value.

FOR SLOW, READABLE SCROLLS:

<pre><code>[UIView animateWithDuration: 1.5//this will directly set your speed. n rows scrolled every 1.5 seconds.
</code></pre>

NOTE: If you change frames of CALayers or Views (eg. a customView you may have added to the contentView of your tableViewCell), then those animations will start to bother you here. For a large animation duration, they will be very visible and you may see strange cell beahviour.

In that case wherever you change your frames etc. look at something like:

<pre><code>[CATransaction begin];
[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
[myView.myCALayer.frame = (CGRect){ { 10, 10 }, { 100, 100 } ];
[CATransaction commit];
</code></pre>

Find the above solution <a href="https://stackoverflow.com/questions/12103142/calayer-animates-with-frame-change">here</a>.

You may also have to set the actions dictionary for the layer to return nulls for all actions.

<pre><code>NSMutableDictionary *newActions = [[NSMutableDictionary alloc] initWithObjectsAndKeys:[NSNull null], @"sublayers", nil];
superlayer.actions = newActions;
</code></pre>

This seems to be too late but for people facing the same problem I hope this answer will be helpful. Also please feel free to guide me in case I have made some obvious (or not so much) blunder.

Edit: Oops, I see the exact thing above my answer :(
Anyways, this is a bit more detailed and I am only a beginner :)

I'm building a custom slot machine with a column that exists of a uitableview.

When the user pulls a lever the tableview should scroll to a certain position with an index.
I used the method:

<pre><code>- scrollToRowAtIndexPath:atScrollPosition:animated:
</code></pre>

But this method will make the table scroll with a constant duration. So you will not really recognize a long or short spin.

I'm looking for a way to:
A) Slow down the scroll animation. Or,
B) Change the duration for the scroll animation to a self defined value.

The normal scroll animation (with the finger) does show this effect.
Maybe it is a stupid idea, but is it an idea to invoke a touchesBegan and touchesDidEnd method on my tableView?

Thanks already

UITableView scroll smooth with certain speed?

我正在构建一个定制的老虎机，它有一个uitableview列。当用户拉动操纵杆时，表格视图应该滚动到带有索引的某个位置。我使用的方法是：- scrollToRowAtIndexPath:atScrollPosition:animated:但此方法将使表格滚动的持续时间恒定。所以你不会真的识别出长旋转或短旋转。我正在寻找...

问UITableView滚动是否以一定的速度平滑？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问UITableView滚动是否以一定的速度平滑？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问UITableView滚动是否以一定的速度平滑？
EN