播放声音时的UIScrollView正在滚动 [英] Play sound when UIScrollView is scrolling

问题描述

我有一个可以滚动到两侧（只左右，不要上下）滚动视图。
我想打一个短的声音（不到​​一秒）每当滚动视图移动x像素到两边。

I have a scroll view that can be scrolled to the sides (only left and right, not up and down). I want to play a short sound (less than a second) whenever the scroll view is moved X pixels to either side.

如何才能做到这一点？ code样品将大大AP preciated ...

How can this be done? Code samples will be greatly appreciated...

谢谢，

推荐答案

下面是code我用：

我添加了SoundEffect.h和SoundEffect.m文件到我的项目（​​你可以在网上找到）。
然后，我创建了一个声音效果实例：

I added the SoundEffect.h and SoundEffect.m files to my project (you can find them online). Then, I created a sound effect instance:

SoundEffect *soundEffect;

然后，我安装我的UIViewController作为我的UIScrollView的代表加入＆LT; UIScrollViewDelegate＆GT; 到视图控制器的.h文件和设置的相关出口UIScrollView的。

Then, I setup my UIViewController as the delegate of my UIScrollView by adding <UIScrollViewDelegate> to the .h file of the view controller and setting the relevant outlet of the UIScrollView.

在 - （无效）viewDidLoad中的方法，我初始化我的声音效果：

In the -(void)viewDidLoad method, I initialized my sound effect:

NSBundle *mainBundle = [NSBundle mainBundle];
soundEffect = [[SoundEffect alloc] initWithContentsOfFile:[mainBundle pathForResource:@"Tik" ofType:@"wav"]];

然后，我实现了这两种方法：

And then, I implemented these two methods:

#pragma mark -
#pragma mark Scroll View Delegate Methods

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    lastScrollPosition = scrollView.contentOffset.x / 55;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{   
    if ((int)(scrollView.contentOffset.x / 55) != lastScrollPosition1)
    {
        lastScrollPosition1 = scrollView.contentOffset.x / 55;
        [soundEffect1 play];
    }
}

我需要的音效，以每55个像素火到两个方向，但你可以改变这符合您需求的恒定值。
它为我的伟大工程，并希望，这将有助于其他人也...

I needed the sound effect to fire every 55 pixels to either direction, but you can change this to a constant value that fits your needs. It works great for me, and hopefully, it will help others as well...

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