xcode 两个滚动视图同时工作，一键式

Two scroll view work Simultaneous with one touch

提问by sinh99

I am working on application in it I have to work with two scroll view Simultaneous in one touch. It means if I scroll one scroll view at same time another scroll view must scroll with it.

我正在处理其中的应用程序，我必须一键式同时处理两个滚动视图。这意味着如果我同时滚动一个滚动视图，另一个滚动视图必须随之滚动。

If this is possible then how can it be done?

如果这是可能的，那么怎么做呢？

回答by TigerCoding

Implement the UIScrollViewDelegate protocol in the view controller containing both scroll views. In the:

在包含两个滚动视图的视图控制器中实现 UIScrollViewDelegate 协议。在里面：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

delegate method, get the content offset:

委托方法，获取内容偏移量：

CGPoint offset = [scrollViewA contentOffset]; // or scrollViewB

Then set the other control with:

然后设置另一个控件：

- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated

You can determine which one to change by comparing in the delegate method above:

您可以通过在上面的委托方法中进行比较来确定要更改哪一个：

if( scrollView == scrollViewA ) // change offset of B
else // change offset of A

回答by Jab

Don't have to read

不必阅读

Generally (at least from what I know) it's bad "style" to have 2 UIScrollView/UITableVIew's in each other because it causes the UI to be hard to interact with. But I think if you have a valid enough use/reason for doing it then I'll show you a way to get it done.

通常（至少从我所知道的情况来看），将 2 UIScrollView/UITableVIew放在一起是不好的“风格”，因为它会导致 UI 难以交互。但我认为，如果您有足够有效的用途/理由来做这件事，那么我会向您展示一种完成它的方法。

CODE!

代码！

If it was me then I'd just override the UIScrollView's touchesMovedmethod and scroll the other UIScrollViewthat way.

如果是我，那么我只需覆盖UIScrollView'stouchesMoved方法并以UIScrollView这种方式滚动另一个。

Within scrollView_1

在 scrollView_1 内

-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event  {

    UITouch *touch = [ touches anyObject];
    CGPoint newLocation = [touch locationInView: [touch view]];
    CGPoint oldLocation = [touch previousLocationInView:touch.view];
    CGPoint translation = CGPointMake(newLocation.x - oldLocation.x, newLocation.y - oldLocation.y);
    scrollView_2.contentOffset = CGPointMake(scrollView_2.contentOffset.x + translation.x, scrollView_2.contentOffset.y + translation.y)

}

Hope this helps

希望这可以帮助

回答by Ketan Patel

• (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated

• (void)setContentOffset:(CGPoint)contentOffset 动画:(BOOL)动画

if( scrollView == scrollViewA ) // change offset of B else // change offset of A

if( scrollView == scrollViewA ) // 改变 B 的偏移量 else // 改变 A 的偏移量

回答by Ketan Patel

Understand this code; may be it helps you.

理解这段代码；可能对你有帮助。

---

---

(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardshow:) name:UIKeyboardDidShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardhide:) name:UIKeyboardDidHideNotification object:nil];
    myscrollview.contentSize=CGSizeMake(560, 420);
    showkeyboard=NO;
}

(void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];

    [[NSNotificationCenter defaultCenter] 
    removeObserver:self];
}


(void) keyboardshow : (NSNotification *) notification
{
    if (showkeyboard)
    {
        return;
    }

    NSDictionary *info=[notification userInfo];

    NSValue *avalue=[info objectForKey:UIKeyboardBoundsUserInfoKey];
    CGSize keyboardSize = [avalue CGRectValue].size;
    offset = myscrollview.contentOffset;
    CGRect viewFrame = myscrollview.frame;
    viewFrame.size.height -= keyboardSize.height;
    myscrollview.frame = viewFrame;
    CGRect textFieldRect =[mytext3 frame];
    textFieldRect.origin.y +=10;
    [myscrollview scrollRectToVisible:textFieldRect animated:YES];
    showkeyboard =YES;
}

(void) keyboardhide : (NSNotification *) notification
{
    if(!showkeyboard)
    {
        return;
    }

    myscrollview.frame =CGRectMake(0, 0, 320, 460);
    myscrollview.contentOffset=offset;
    showkeyboard=NO;

}